Two-step Anodization Research Articles

Effects of NH 4 F and H 2 O on the Geometry of TiO 2 Nanotubes, TiO 2 나노튜브 형상에 미치는 NH 4 F와 H 2 O의 영향

The aim of this work is the attainment of the TiO2-nanotube photocatalytic-growth condition using anodization, whereby the NH4F-H2O weight ratio is appropriately controlled. We fabricated the TiO2 nanotubes using a two-step anodization (first step is 1 hr; second step is 30 hr) under the ambient pressure and the room temperature at 60 V in ethylene-glycol solutions to investigate the effects of the NH4F(0.1,0.3,0.5wt%) and H2O(1-3wt%) on the TiO2-nanotube geometry and the photocatalytic efficiency. Further, the decomposition efficiency of the methylene blue on the TiO2 nanotubes by the UN radiation depended on the geometrical change of the nanotube geometry, indicating the proportionality of the decomposition efficiency to the surface area that was affected by the NH4F and H2O concentrations. As the NH4F weight was increased, the surface area initially decreased but slightly increased later, and the length consistently increased. As the H2O weight was increased, the surface area and length initially increased, but later decreased with the 3 wt% H2O.

Fabrication of self-branched TiO2 nanotubes by anodization method, ordering and crystallinity

This paper reports on the self-branching of TiO2 nanotubes during anodization of Ti metal carried out at a fixed applied potential. These nanotubes are prepared by a two-step anodization carried out in an aqueous electrolyte containing ethylene glycol and ammonium fluoride at a range of anodization voltages of 30–60 V. The self-branching of nanotubes is more pronounced in the first-step anodization than during the second-step anodization at each voltage studied. The nanopits on the titanium surface, exposed after the dissolution of the oxide layer formed in the first-step anodization are observed to be highly regular and uniform. These nanopits provide nucleation sites producing less branched arrays during second step of anodization. Moreover, symmetric pits also result in straight tubes from top to bottom. Considering different applied voltages, the TiO2 nanotubes prepared at 50 V are comparatively more uniform and tend to grow straighter, whereas, numerous turns and pore branching are observed at other applied voltages. In this way, the best order in the tube arrays is found at anodization voltage of 50 V shown by the quantitative analysis as well. In addition, the nanotubes prepared by second-step anodization have shown higher crystallinity and with anatase as the major crystalline phase.

3D nanoporous titania formed by anodization as a promising photoelectrode material

Nanoscale control of the growth of inorganic metal oxides determines their structures and properties, and leads to development of novel nanostructured materials with fundamental and practical importance from a point of view their further applications. After anodic aluminum oxide, the next nanoporous material which has attracted tremendous interest of researchers around the world, is nanoporous anodic titanium oxide (ATO) formed by anodization. The main objective of this work was to investigate the ability of formation of anodic titanium oxide structures, particularly in the form of TiO2 nanopore arrays on 3D titanium substrates (Ti mesh) in viscous electrolyte containing fluoride ions. Three-dimensional (3D) TiO2 nanopore arrays grown on Ti mesh were prepared via two-step electrochemical anodization process, and the effect of anodizing potential and duration of the process on the formation of ATO layers on titanium mesh were investigated. The 3D TiO2 nanopore arrays on Ti mesh were characterized by using field emission scanning electron microscopy and X-ray diffraction (XRD) technique. The results showed that the optimized anodization conditions for preparation of titanium dioxide nanopore arrays are 40 and 50 V of the applied potential, and 10 min of time processing. The effect of annealing temperature of ATO layers on their morphology and phase composition was also investigated in detail. The amorphous ATO layers on titanium mesh transform to anatase phase at 400 °C and further to rutile phase at 600 °C. However, photoelectrochemical tests demonstrated that the best photoelectrochemical performance of fabricated 3D photoanodes was observed for the samples anodized at 40 V or 50 V for 10 min, and annealed at 400 °C. The photoelectrochemical properties of the mesh-based and typical plate TiO2/Ti electrodes were compared. It was found that the higher photoconversion efficiency was observed for the 3D TiO2/Ti mesh electrode than for a typical plate TiO2/Ti electrode. It is expected that anodizing of three dimensional (3D) Ti substrates will offer an opportunity to enhance various properties of anodic titanium oxide, especially its photoactivity.

Effect of synthesis parameters on visible light photocatalytic activity of graphene-TiO2 nanocomposites for industrial wastewater treatment

Reduced graphene oxide (RGO)-TiO2 nanotubes (TNTs) were used for industrial wastewater treatment that was obtained from Banwol Sihwa Industrial Complex, Korea. RGO-TNT were fabricated using one-step and two-step anodization at different RGO concentrations, RGO deposition times, anodization voltages and anodization times. Synthesized catalysts were characterised using FESEM, XRD, TEM, EDS, XPS, UV–vis DRS, PL, Raman, and pHPZC. Compared with pure-TNTs, two-step and one-step RGO-TNT exhibited 2.7 and 3.3-times higher photocatalytic activities for industrial wastewater. Scavenger experiments identified that OH and e− are main species involved in photocatalytic degradation of MB and industrial wastewater. RGO-TNTs are suitable for industrial wastewater treatment.

Photoluminescence enhancement and morphological properties of nanoporous anodic alumina prepared in oxalic acid with varying time and temperature

We report on the photoluminescence (PL) enhancement and morphological properties of highly ordered Nanoporous anodic alumina (NAA) fabricated by two-step anodization for 2–10 h at 5 °C and 25 °C anodization temperatures. Structural features and pore arrangements of NAA were characterized. Pore-properties such as pore-diameter, porosity and growth rate showed an increase with rising in temperature whereas pore-wall thickness and barrier layer thickness decreased, however, interpore distance and pore density were not affected. Two-dimensional fast Fourier Transform (FFT) analysis was used to study the pore arrangement. The average pore regularity ratio was higher at 5 °C. The Photoluminescence (PL) spectra of NAA samples exhibited a strong visible blue emission at room temperature. The broad PL peak was deconvoluted into two Gaussian sub-bands attributed to luminescent F+ and F centers. Experimental results showed that NAA prepared at elevated temperature showed PL enhancement by about 3.6–4.8 fold due to the increased anodizing current which leads to the increased density of F centers compared to F+ centers.

Fabrication of highly-ordered TiO2 nanocolumns by two-step anodizing of an Al/Ti layer in etidronic acid

TiO2 nanocolumns were fabricated by a two-step anodizing process of an Al/Ti bilayer system and using as electrolyte 0.3 M etidronic acid at 40 °C. To prepare the Al/Ti bilayer samples, two different procedures were employed, obtaining either nanocolumns with or without highly-ordered. It was found that the titania nanocolumns were chemically stable after selective alumina dissolution in 0.05 M KOH at 50 °C. Nanocolumns of different heights were obtained, height averages ranged between 170 and 689 nm, depending on the potentiodynamic rate and the final voltage employed in the second anodizing step. The diameter of the nanocolumns, in all cases, was about 286 nm. Raman and X-ray diffraction analysis confirmed that after heat treatment at 600 °C for 3 h, the TiO2 nanocolumns have a crystalline structure composed of both anatase and rutile phases.

Facile Fabrication of Ordered Anodized Aluminum Oxide Membranes with Controlled Pore Size by Improved Hard Anodization.

We have fabricated highly ordered anodized aluminum oxide (AAO) membranes with different diameter through improved hard anodization (HA) at high temperature. This process can generate thick AAO membranes (30 μm) in a short anodizing time with high growth rate 20-60 μm h-1 which is much faster than that in traditional mild two-step anodization. We enlarged the AAO pore diameter by adjusting the voltage rise rate at the same time, which has a great influence on current density and temperature. The AAO pore diameter varies from 60-110 nm to 160-190 nm. The pore diameter (Dp) of the AAO prepared by this improved process is much larger than that prepared by HA (40-60 nm) when H2C2O4 as electrolyte. It can expand potential use of the AAO membranes such as for the template-based synthesis of nanowires or nanotubes with modulated diameters and also for practical separation technology. We also has used the AAO with different diameters prepared by this improved HA to fabricate Co nanowires and γ-Fe2O3 superparamagnetic nanorods.

Fabrication of Al2O3 nanopores/SnO2 and its application in photocatalytic degradation under UV irradiation

In the present work, the photocatalytic degradation methyl orange (MO) by Al2O3-NP/SnO2 was investigated under UV light irradiation. For this purpose, the Al2O3-NP electrode was synthesized under the suitable conditions by two-step anodization technique and Al2O3-NP/SnO2 electrodes were prepared by sol-gel technique. The structure and morphology of the electrode were characterized by field-emission scanning electron microscope (FE-SEM), energy-dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD). The FE-SEM results indicate that pore diameter and thickness of Al2O3-NP/SnO2 are 65.92 nm and 23.75 μm, respectively. EDX analysis shows that Al2O3-NP/SnO2 electrode contains 12.56 (wt.) % Sn and 44.43% O. The effect of some parameters, such as initial MO concentration, initial pH, temperature, irradiation area and reusability were determined. Kinetic analyses indicate that the photodegradation process of MO obeys the pseudo-first-order kinetic model. Additionally, thermodynamic parameters such as Ea, ΔH, ΔS and ΔG were calculated. The activation energy was determined to be 21.77 kJ/mol. This photocatalyst with good photocatalytic activity and a large surface area exhibits an effective potential in the treatment of wastewater.

3D-Nanorod Fenton-like CuO/TiO2 Photocatalyst By Electrodeposition in AAO Template for Dye Degradation

Recently, nanostructures such as nanorods and nanowires have drawn much interest because of their unique electronic and optical properties. Anodic aluminum oxide (AAO) method is a promising template-assisted technique which ensures high quality and repeatability for fabrication. Morphology of periodical nanoscale pores in AAO templates has been studied in relation with anodizing process for a few decades. The AAO templates are well prepared by a two-step anodization process method in 0.3 M oxalic acid solution at 10 °C and anodizing voltage 40 V. After first-step anodization, AAO layer was etched out in 5 wt.% phosphoric acid and 2.24 wt.% chromic acid at 60 °C for 1 HR. After barrier thinning, the AAO template was immersed into a 5 wt.% phosphoric acid solution at room temperature for 45 minutes. The pore length increases with electrochemical etching time, while the pore size and interpore distance depend on the applied potential. In our work, the AAO template is 45 nm in diameter and the interpore distance and pore length are 100 nm and 1 μm, respectively. In case that the Al2O3 barrier layer is too thick for the electrodeposition, barrier thinning proceeds by limited current is a necessary process to lower the working voltage and to create the nucleation site for the growth of Cu. The Cu/Cu2O composite nanorods are synthesized from aqueous solution prepared from 0.7 M of CuSO4 dissolved in DI water, with applied pulse potential -1.5 V at room temperature. The nanorods were annealed at 400 °C and resulted in the formation of CuO. After that, TiO2 thin film was deposited on the top followed by annealing at 550 °C to form anatase. Etching out the AAO template, we can obtain CuO nanorod arrays standing on TiO2 thin film nanostructure for application in water treatment. Besides, it can also be transferred on other flexible substrate or on the surface of the item promoting self-cleaning property. CuO is a great Fenton-like photocatalyst which is active with H2O2 and produces free radicals reacting with the dye or pollutants. TiO2 is stable in water and possesses good photocatalytic property in anatase phase. CuO is a narrow bandgap p-type metal oxide semiconductor which provides electrons and holes and absorbs infrared light, while TiO2 is a n-type metal oxide semiconductor which absorbs UV light and has high transparency in sunlight. We combine two metal oxide to form heterojunction with AAO and electrodeposition method. When the infrared light is absorbed by CuO nanorods exciting electron and holes, the electrons shift to TiO2 and the holes stay in CuO. These electron-hole pairs can react with H2O2 producing free radicals and start dye degradation. Furthermore, CuO nanorods immobilized on TiO2 film nanostructure can also be applied as gas sensors or photodetectors and for water splitting.

(Invited) Charge Transfer Behaviour of Modified Titania Nanotube Arrays Transplanted on Transparent Conducting Oxides

Free-standing, one-dimensional TiO2 nanotube arrays (TNAs) with disordered surface structure are synthesized on transparent conducting substrates, and their opto-physicochemical properties and photoelectrocatalytic (PEC) performances are examined in detail. TNAs grown on titanium foils are transplanted onto fluorine-doped SnO2 substrates via a two-step anodization process (denoted W-TNAs), followed by being reduced electrochemically for 20 and 90 s (denoted B-TNAs-20 and 90, respectively). As-transplanted W-TNAs exhibit the low PEC activities in terms of photocurrent, and oxygen evolution reaction (OER), and oxidations of inorganic and organic substrates (iodide and urea, respectively) under simulated sunlight (AM 1.5; 100 mW×cm- 2) primarily because of sluggish charge transfers through low electrical conductive TNAs framework. The quick electrochemical reduction of W-TNAs leads to 8-fold larger photocurrent, while significantly accelerating the OER by three times, and the oxidations of iodide and urea by 2 and ~20 times, respectively. Such enhanced PEC activity of B-TNAs is attributed to creation of Ti3+ and associated oxygen vacancy (examined with XPS, EPR, and Raman), strengthening n-type character and thereby increasing electrical conductivity (examined with Mott-Schottky and Nyquist). Time-resolved photoluminescence spectra further reveal that the lifetime (t) of photogenerated charge carriers in B-TNAs (t = 0.33 ns) is an order of magnitude shorter than that of W-TNAs (t = 3.63 ns). The disordered surface exhibits lower Faradaic efficiency for multi-electron transferred oxidation reactions whereas higher Faradaic efficiency for single-electron transfer oxidations compared to W-TNAs. Detailed surface characterization and PEC mechanism are discussed.

Ionic Transport in Aptamer Functionalized Nanochannel Array

We report theoretical and experimental results of the influence of surface immobilized aptamers on ionic transport through nanochannels. The ionic transport in a polyelectrolyte functionalized nanochannel may be modified either by electrostatic mechanisms that involve changes in double layer formed near the pore walls or through steric hindrance of the surface chains on the transport of solution ions. Arrays of well-defined nanochannels are fabricated using two-step anodization process of aluminum on ITO coated glass substrate. The anodization voltage and electrolyte are chosen to achieve the desired nanochannel radius and distribution. The alumina nanochannels are functionalized with thrombin binding DNA aptamers (TBA) to enable the formation of monomolecular films of polyelectrolytes on the nanochannel surface. The functionalized nanochannel arrays are then exposed to different concentrations of α-thrombin and change in impedance across the nanochannel array are characterized in order to identify the influence of protein/aptamer binding on the ionic conduction in the nanochannels. Both DNA aptamers (specific to thrombin) and α-thrombin are charged species and their interactions produce modulation of surface charges and modify the net ionic conductance across the nanochannel. We also characterized changes in ionic conductance in presence of γ-thrombin, an uncharged protein that has similar physiological structure as α-thrombin but no affinity towards TBA. Ionic and solution transport in the nanochannel is modeled using coupled Poisson-Nernst-Planck equation and Navier-Stokes equations. The conformation and charge density of aptamer monomolecular films on the nanochannel surface was modeled based on molecular dynamics simulation results of aptamer and thrombin/aptamer complexes (Gosai et al., 2016). The predicted changes in ionic conductance are compared to experimental results to identify the influence of electrostatic and steric interactions on the ion transport in polyelectrolyte functionalized nanochannel. The results show that aptamer functionalized alumina nanochannel have potential to be used for the development of disposable and point of care devices by employing relatively facile and inexpensive fabrication methodologies. Reference: Gosai, A., Ma, X., Balasubramanian, G., Shrotriya, P., 2016. Electrical Stimulus Controlled Binding/Unbinding of Human Thrombin-Aptamer Complex. Sci. Rep. 6, 37449. doi:10.1038/srep37449

Formation of nanoporous oxide by self-organized anodizing of FeAl intermetallic alloy in oxalic acid solution containing glycol

Nanoporous oxide was formed by self-organized two-step anodizing of FeAl intermetallic alloy in 0.3 M (COOH)2 with 20 vol% of glycol, what allowed to decrease ionic mobility and consequently decrease current density and oxide growth rate. Additionally, the voltage range for anodizing was extended up to 40 V, while compared to FeAl anodizing in sulfuric acid. Furthermore, morphology of the grown oxide can be controlled by the voltage: pore diameter and interpore distance increase linearly with the voltage, but slopes of the fitted lines are smaller than in the case of intermetallics anodizing in different electrolytes.

Integration of low-loss inductors on thin porous silicon membranes

The rising market of flexible nomadic systems requires the development of cost-efficient processes and high performance devices. In this study, we report on a simple technique to integrate micro-inductors on a low-loss 50 μm-thick porous silicon membrane. The etching of porous silicon was performed according to a two-step anodization process in order to create a fragile interface between the silicon substrate and the porous layer. Then, the integration of radio-frequency micro-inductors followed a conventional microelectronic procedure. At the end of the process, the membranes with the devices were mechanically peeled-off from bulk silicon, providing the possible means to recycle the silicon substrate for subsequent devices integration. S-parameters measurements showed a significant improvement of the quality factor and the resonant frequency after the substrate removal. This result is promising for the near future of ultra-thin flexible electronic devices.

Efficient nano titanium electrode via a two-step electrochemical anodization with reconstructed nanotubes: Electrochemical activity and stability

A two-step anodization method was used to prepare an efficient nano Ti electrode (ENTE), based on the nano Ti electrode (NTE) that was synthesized by the traditional anodization method. The result of FESEM showed there were many nanopores and nanoparticles on the surface of the ENTE. Compared with Ti electrode, the ENTE exhibited an increased electrochemical activity of nitrate reduction, attributing to its ∼1.09-fold higher reduction peak current density. Values of average current efficiency towards nitrate reduction indicated that the electrochemical properties of different electrodes were raised in the order of ENTE (0.36) > NTE (0.25) > Ti electrode (0.15). The ENTE exhibited a ∼3.33-fold higher electroactive surface area than that of Ti electrode. The higher current density throughout the 1000 s and the ∼1.27-fold higher final current density at 1000 s suggested that the ENTE had a higher stability for nitrate electroreduction. The nitrate reduction efficiency increased with the increasing of initial nitrate-nitrogen concentration and temperature. Similar effect was obtained from current density below 50 mA cm−2. And under the neutral condition, a higher nitrate reduction efficiency was achieved. The curved surface and higher surface area due to the nanopores of the ENTE increased the nitrate concentration in the EDL and enhanced the potential of individual nitrate ions in the diffuse layer exponentially. This research provided a new route to assess a nano-electrode with high stability and a clear reaction mechanism in EDL.

Mechanical stability of heat-treated nanoporous anodic alumina subjected to repetitive mechanical deformation

We report studies on the mechanical response and deformation behavior of heat-treated nanoporous anodic alumina using a micro-balance test and experimental test equipment especially designed for this purpose. AAO samples were characterized mechanically by a three-point bending test using a micro-analytical balance. The deformation behavior was studied by repetitive mechanical bending of the AAO membranes using an electronically controlled system. The nanoporous AAO structures were prepared electrochemically from Al sheet substrates using a two-step anodizing technique in oxalic acid followed by heat treatment at 700 °C in air. The morphological study of the aluminum oxide layer after the mechanical tests and mechanical deformation was conducted using scanning electron and optical microscopy, respectively. The experimental results showed that the techniques proposed are simple and accurate; they could, therefore, be combined to constitute a method for mechanical stability assessment of nanostructured AAO films, which are important structural components in the design of MEMS devices and sensors.

Study of the highly ordered TiO2 nanotubes physical properties prepared with two-step anodization

Abstract Highly ordered hexagonal closely packed titanium dioxide nanotubes (TiO2 NTs) were successfully grown by a two-step anodization process. The TiO2 NTs were synthesized by electrochemical anodization of titanium foils in an ethylene glycol based electrolyte solution containing 0.3 wt% NH4F and 2 vol% deionized (DI) water at constant potential (50 V) for 1 h at room temperature. Physical properties of the TiO2 NTs, which were prepared via one and two-step anodization, were investigated. Atomic Force Microscopy (AFM) analysis revealed that anodization and subsequently peeled off the TiO2 NTs caused to the periodic pattern on the Ti surface. In order To study the nanotubes morphology, Field Emission Scanning Electron Microscopy (FESEM) was used, which was revealed that the two-step anodization resulted highly ordered hexagonal TiO2 NTs. Crystal structures of the TiO2 NTs were mainly anatase, determined by X-ray diffraction analysis. Optical studies were performed by Diffuse Reflection Spectra (DRS) and Photoluminescence (PL) analysis showed that the band gap of TiO2 NTs prepared via two-step anodization was lower than the band gap of samples prepared by one-step anodization process.

Influence of TiO2-Coating Layer on Nanoporous Alumina Membranes by ALD Technique

Geometrical, chemical, optical and ionic transport changes associated with ALD of TiO2-coating on the porous structure of two nanoporous alumina membranes (NPAMs), which were obtained by the two-step aluminum anodization method but with different pore size and porosity, are presented. Chemical and morphological changes were determined by analyzing XPS spectra and SEM images, showing practically total coverage of the NPAMs surface and leading to a reduction in the geometrical parameters of both samples, while SAED and high resolution TEM measurements allowed us to determine the crystalline structure and thickness of the TiO2-coating, with the latter confirmed by depth-profile XPS analysis. Spectroscopic ellipsometry measurements were also carried out in order to detect changes in characteristic optical parameters (refractive index, n, and extinction coefficient, k), due to the TiO2-coating of NPAMs. Considering the common application of NPAMs in solute/ion diffusion processes, the effect of the TiO2-coverage on electrochemical parameters was analyzed by measuring the concentration potential with a typical model electrolyte (KCl solutions), leading to an increase of the electropositive character for both kinds of samples.

The correlation between structural properties, geometrical features, and photoactivity of freestanding TiO2 nanotubes in comparative degradation of 2,4-dichlorophenol and methylene blue

Freestanding TiO2 nanotubes (FSNTs) with various physical dimensions were fabricated by two-step anodization process with different voltages and anodization times. The detachment method employed in this study involved voltage reduction at the end of the second step and ultrasonic chemical treatment. The results demonstrated that this detachment method is a beneficial technique to create thin open-mouthed and closed-end FSNTs (with lengths of 6–14 μm). Moreover, the influences of anodization conditions on photocatalytic activity, structural properties and geometrical features of FSNTs in comparative degradation of two non-colored (2,4-dichlorophenol) and colored (methylene blue) pollutants were investigated. Findings revealed that the quantity of the photocatalyst utilized is an effective parameter and using the optimum weight (10 mg/100 ml of 2,4-dichlorophenol) could increase the efficiency of the process up to 21%. Further, the results demonstrated that if equal optimum weights of FSNTs are chosen, decreases in voltage and anodization time significantly influence the structural properties, geometrical features, and photodegradation efficiency. The enhancement achieved in the degradation of both 2,4-dichlorophenol and methylene blue using the nanotubes with the shortest diameter (54 nm) and length (6.5 μm), which possess the lowest porosity (0.5) and also the highest surface area (0.53 m2 g−1), nanotubes’ density (19 cm2 cm−2) and wall thickness to length ratio (2). In addition, the results obtained indicated that the degradation reactions follow first-order kinetics in the degradation of the both pollutants. The apparent degradation rate constant of methylene blue was approximately 1.2 times greater than of the 2,4-dichlorophenol due to the negative charge of the nanotubes’ surface and electrostatic adsorptions.

The nanoporous anodic alumina oxide formed by two-step anodization

The nanoporous anodic aluminum oxide (AAO) was fabricated by two-step anodization technique. The effects of anodization electrolyte and time on the pore diameter and structural properties of the AAO were investigated. The Field Emission-Scanning Electron Microscopy was used for the analysis of the surface morphology of AAO structure. The nanoporous structures with the pore size in the range of 31–113 nm and oxide layer thickness 3.4–33 μm were obtained. Wetting properties of these surfaces were characterized by measurements of the water contact angle. It was seen that the surface of the AAO became hydrophilic with the increase in the anodization time. Furthermore, we explored the mechanical properties and thermal stabilities of the AAO by microhardness and thermo-gravimetric analysis measurements. It was found that the AAO structures synthesized in the electrolyte containing ethylene glycol solution have the highest hardness and display well thermal stability among the other structures. The surface area and crystal structure of AAO were determined by surface area analysis and X-ray diffraction patterns measurements. Experimental results showed that the AAO structures have amorphous phase and the highest surface area is 2.59 m2/g.

Development of an UV rolling system for fabrication of micro/nano structure on polymeric films using a gas-roller-sustained seamless PDMS mold

Roller imprinting is one of the most effective methods to fabricate polymeric plate components with nanostructures on the surface. In this study, a gas-bag roller is employed to increase the contact area and ensure conformity of contact between the roller mold and the substrate. The gas-bag roller has a seamless polydimethylsiloxane (PDMS) roller mold with a nano-pillar array. Most of the replicated patterns are not continuous because of roller mold with seams, therefore, the seamless roller mold was produced by PDMS and used to imprint the patterns in this research. Micro/nano-structures were fabricated by casting into the micro/nano-pores of the anodic aluminum oxide (AAO) roller. The micro/nano-pores in the AAO roller are made by a two-step anodization process from a circular aluminum tube of 99.9% purity. An UV-based imprinting facility integrating a gas-bag roller and PDMS roller mold were designed and implemented to replicate nanostructures on the surface of the polycarbonate (PC) continuously. The antireflection and the hydrophobic effects of the fabricated PC film were verified. The reflection drops from 14.7% in the bare PC film to 2% in the PC film, and the contact angle increases from 77.5° in the bare PC film to 124.1° in the PC film with nanostructures.