850-nm Wavelength Research Articles

HEA-PVA gel system for UVA radiation dose measurement

Acrylic monomer is known to be sensitive to ultraviolet radiation (UVR) through photoinitiator. Upon irradiation, the acrylic monomers formed stable polymer through free radical polymerization, hence its appearance will change from colorless and transparent to colored and non-transparent. Furthermore, the degree of changes was based on the UVR dose, and those optical changes could be detected by UV–vis spectrophotometer at the fixed wavelength of 550nm. In this study, we used 2-hydroxyethyl acrylate (HEA) as acrylic monomer, which mixed with polyvinyl alcohol (PVA), and finally obtained a three-dimensional hydrogel material through cross-linking by glutaraldehyde (GA). After doping with photoinitiator-Bis(2,6-difluoro-3-(1-hydropyrro-1-yl)-phenyl) titanocene (784), the gel material was sensitive to UV-A radiation (400–315nm), which forms an important part (~97%) of the natural solar UV radiation reaching the earth surface. The behavior of different formulations' dose response sensitivity, detector linearity, diffusion, stability after UVA radiation were investigated. The results showed that when the dosage range of UVA radiation was 0–560J/cm2, the gel had a great sensitivity and the linearity was found to be closed to 1. After UVA radiation, the gel also had a very good optical stability. In addition to this, when irradiated with high dose UVA, the gel could maintain a low diffusion.

Optical characteristics of multiple layered InGaN quantum wells on GaN nanowalls grown on Si (111) substrate

GaN nanowall crystals and InGaN multiple quantum wells (MQWs) were grown on Si (111) substrate using molecular beam epitaxy. In high N/Ga flux ratio, dense two dimensional network GaN nanowall structures were grown with small pores. The continuity of GaN nanowall structures was decreased as decreasing the N/Ga flux ratio. In the N/Ga flux ratio of 50, nanopillars and nanowalls were mixed. The InGaN MQWs were formed on the GaN nanowall crystals which were grown in the various N/Ga flux ratios. The strong photoluminescence originated from the InGaN MQWs on GaN nanowall crystals around a wavelength of 400nm was observed at the temperatures from 8K to 300K (room temperature). The ratios of the photoluminescence intensities at 8K and the room temperature were measured for the InGaN MQWs. The higher ratio was obtained as decreasing the N/Ga flux ratio of the GaN nanowall crystal growth.

Light-emitting diodes at 940 nm attenuate colitis-induced inflammatory process in mice

Inflammatory bowel disease (IBD) presents intense inflammatory infiltrate, crypt abscesses, ulceration and even loss of function. Despite the clinical relevance of IBD, its current therapy remains poorly effective. Infrared wavelength phototherapy shows therapeutic potential on inflammation. Our goal was to evaluate whether light-emitting diodes (LED) at 940nm are capable of mitigating the colitis-induced inflammatory process in mice. Forty male Swiss mice were assigned into five groups: control; control treated with LED therapy; colitis without treatment; colitis treated with LED therapy; colitis treated with Prednisolone. Experimental colitis was induced by acetic acid 7.5% (pH2.5) rectal administration. LED therapy was performed with light characterized by wavelength of 940nm, 45nm bandwidth, intensity of 4.05J/cm2, total power of 270mW and total dose of 64.8J for 4min in a single application. Colitis-induced intestinal transit delay was inhibited by LED therapy. Colitis caused an increase of colon dimensions (length, diameter, total area) and colon weight (edema), which were inhibited by LED therapy. LED therapy also decreased colitis-induced tissue gross lesion, myeloperoxidase activity, microscopic tissue damage score and the presence of inflammatory infiltrate in all intestinal layers. Furthermore, LED therapy inhibited colitis-induced IL-1β, TNF-α, and IL-6 production. We conclude LED therapy at 940nm inhibited experimental colitis-induced colon inflammation in mice, therefore, rendering it a promising therapeutic approach that deserves further investigation.

Defect-free mixed mono- and bi-layer graphene synthesized from refined palm oil by thermal chemical vapor deposition

Growth of defect-free large-area mixed mono-and bi-layer graphene using refined cooking palm oil on nickel (Ni) via thermal chemical vapor deposition was demonstrated for the first time. Small surface roughness of Ni substrate was obtained by annealing in hydrogen (H2) ambient. Small surface roughness of Ni substrate and introduction of high H2 concentration during the growth improve the uniformity and suppress the formation of defect in the grown graphene. Coverage of mixed mono- and bi-layer graphene up to 65% was obtained. The grown graphene film showed an optical transmission of 80% at a wavelength of 550nm, and a sheet resistance of 12.89kΩ/sq. This work provides an alternative approach towards a development of less expensive growth technology using safe, easily obtained, low value raw carbon-containing precursor.

Application of blue laser direct-writing equipment for manufacturing of periodic and aperiodic nanostructure patterns

This study presents the novel development of low cost, highly efficient blue laser direct-writing equipment for using mask-less laser lithography to manufacture periodic and aperiodic nanostructure patterns. The system includes a long-stroke linear motor precision stage (X, Y), a piezoelectric nano-precision stage (Y, θz), a 3-DOF (degrees of freedom) laser interferometer measurement system, and a blue laser direct-writing optical system. The 3-DOF laser interferometer measurement system gives the control system feedback for displacement (X, Y, θz) of the equipment. The laser processing equipment consists of a blue laser direct-writing optical head, a field-programmable gate array (FPGA) alignment interface, and an optical head servo controller. The optical head operates at a wavelength of 405nm. Processing the nanostructures on thermo-reaction inorganic resists with precise control of the laser intensity, taking advantage of the threshold effect to exceed the limitations of optical diffraction, and reduces the nanostructure hole size. The equipment can be used to fabricate various periodic nanostructure patterns, aperiodic nanostructure patterns, and two-dimensional patterns. The equipment positioning accuracy is within 50nm at a speed of 50mm/s, and the minimum critical dimension can be achieved about 100nm or so.

A very dark-and-conductive electrode based on Mo/MoOx/ITO structure

A dark and conductive electrode based on Mo/MoOx/ITO structure with low resistivity of 1.93×10−4Ω/cm was fabricated by magnetron sputtering. The demonstrated dark electrode exhibits a low reflectance of 2.4–12.9% within the visible spectral range and average luminous reflectance of 3.3%. To improve the conductivity, pure Mo was first sputtered, followed by depositing a dark and conductive MoOx by introducing O2 flow during Mo sputtering. In order to further reduce the reflectance and set the lowest reflectance at the wavelength of 550nm, which is most sensitive to human eyes, an ITO phase changing layer was introduced on top of the MoOx. The demonstrated dark and conductive electrode can serve as bottom contact and can potentially replace the circular polarizer for high contrast top-emitting organic light-emitting diodes.

The effect of laser and botulinum toxin in the treatment of myofascial pain and mouth opening: A randomized clinical trial

This study conducted a randomized clinical trial in 15 patients, who sought care at the Dental Clinic of the University of Passo Fundo, in order to compare the use of low-level laser and botulinum toxin in the treatment of myofascial pain and whether they alter the mouth opening of patients with temporomandibular disorder. The patients were divided into two groups: the Laser group received low-level GaAlAs laser, 100mW of power at a wavelength of 830nm in continuous light emission; and the Toxin group received 30U of botulinum toxin type A (BTX-A) in the first session, and 15U after fifteen days. The assessments were performed by measuring pain with Visual Analogue Scale (VAS), and mouth opening with a digital caliper. Data were submitted to Student's t test at 5% significance level. Regarding pain symptoms, the results indicate that groups treated with laser and toxin registered 7U in VAS, at day 5 the scores were 4.75 and 4.86U, respectively. The laser worked faster (day 12) at 2.75U, and the group treated with BTX-A registered 2.86U at day 30. Both therapies investigated were effective in reducing pain, but the effect of low-level laser was faster than the use of BTX-A. Both treatments showed no statistically significant improvement in mouth opening.

Molecular analysis of apoptosis pathway after photodynamic therapy in breast cancer: Animal model study

BackgroundMolecular investigation of breast tumors has permitted better understanding about interaction of genes and pathways involved in tumor progression. ObjectiveThe aim of this study was to evaluate the association between genes belonging to the pathway of apoptosis with tumor response to photodynamic therapy. Study Design/Materials and methodsThe mammary tumors were induced in twenty-four Spraguey-Dawley female rats by oral gavage of 7,12-dimethylbenz(a)anthracene (8mg/Kg body weight). Animals were divided into three groups: G1 (normal tissue), G2 (tumors without treatment), G3 (animals euthanized 48h after treatment). The photosensitizer used was a chlorin, 5,15-bis-(2-bromo-5-hydroxyphenyl) chlorin in the dose of 8mg/kg for each animal. Light source of diode laser at a wavelength of 660nm, fluence rate of 100mW/cm, and light dose of 100J/cm was delivery to lesions for treatment. A sample from each animal was investigated by quantitative real time PCR using Rat Apoptosis RT2 Profiler™ PCR Array platform. ResultsPro-apoptotic BAK1, CARD6, CASP8, CIDEA, CIDEB, DAPK1, TNF, TNFRSF10B, FASLG, LOC687813, and TP73 genes showed increased expression, and CD40 anti-apoptotic gene showed decreased expression in the group who underwent PDT (G3) in relation to G2. ConclusionThe results indicated that these genes are involved more directly with cellular apoptosis induced by PDT using the Chlorin photosensitizer.

P-Type highly conductive and transparent NdF3-doped tin oxide films prepared by dip coating

Transparent p-type conducting oxide (TCO) films with high conductivity and transparency are in great need to couple with n-type TCO for various electro-optical devices. The purpose of the current study is to explore p-type TCO films with low electrical resistivity and high optical transmittance. We prepared NdF3-added SnO2 (NFTO) thin films, with 0 to 5mol% NdF3, on a glass substrate by sol–gel dip-coating and post-annealed at 475°C. Structural, optical and electrical properties of the resultant NFTO films were investigated. X-ray diffraction patterns indicate tetragonal rutile SnO2 structure with a preferred (110) orientation for all studied films. The absence of impurity peaks indicates that Nd and F atoms may completely dissolve in SnO2 lattice. All films showed excellent transmittance of 84.7 to 90.6% at a wavelength of 550nm. Optical band gap of the NFTO films reduces from 3.94eV for un-doped film to a minimum of 3.75eV for the film with 4mol% NdF3. We confirmed p-type conduction of NFTO films using both Hall-effect and Seebeck coefficient measurements. The film with 2mol% NdF3 shows the lowest electrical resistivity, 8.2×10−3Ωcm, the highest hole-concentration, 8.96×1019cm−3 and a Hall mobility of 9.74cm2V−1s−1. The developed p-type NdF3 added SnO2 TCO films can couple with n-type SnO2 TCO for homo-junctions, which will lead to wide applications in optoelectronics.

Reconstruction of crimes by infrared photography.

Whenever blunt or sharp forces are used in a crime, analysis of bloodstain pattern distribution may provide important information for the reconstruction of happenings. Thereby, attention should be paid to both the crime scene and the clothes of everyone involved in the crime. On dark textiles, though, it is difficult or even impossible for the human eye to detect bloodstains because of the low contrast to the background. However, in the near infrared wavelength range, contrast is considerably higher. Many textiles reflect light beyond a wavelength of 830nm and thus appear light-colored, whereas blood absorbs the light and appears dark. In our studies, a D7000 NIKON reflex camera modified for infrared photography produced high-resolution photographs visualizing even very small spatter stains on dark textiles. The equipment can be used at any crime scene or lab and provides immediately available and interpretable images. Thus, important findings can be obtained at an early stage of police investigations, as two examples (homicide and attempted homicide) illustrate.

Effects of hydroxy propyl cellulose (HPC) surfactant on fabrication, microstructure and optical properties of Ce3+:Lu3Al5O12 (Ce:LuAG) transparent ceramics

Nanosized Ce3+ doped Lu3Al5O12 (Ce:LuAG) powder with narrow particle size distribution and high sinterability were successfully synthesized via a modified co-precipitation method using hydroxy propyl cellulose (HPC) as surfactant. It was suggested that a polymer layer was formed by HPC wrapping on the Ce:LuAG precursors instead of free water during precipitation and drying processes owing to its typical property of lower critical solution temperature (LCST), which could reduce the agglomeration among the particles. The green compact shaped by the powders exhibited a superior linear thermal shrinkage (19.7%) from room temperature to 1500°C and could be subsequently densified into high optical quality Ce:LuAG transparent ceramics at 1750°C for 10h under vacuum sintering without any sintering aids. The in-line optical transmittance of the Ce:LuAG ceramic reached 73.48% at the wavelength of 550nm without observable micro-pores and secondary phases at grain boundaries or within grains.

Impact assessment in Solea senegalensis exposed to light of different wavelengths: growth, stress indicators and pigmentation

Event Abstract Back to Event Impact assessment in Solea senegalensis exposed to light of different wavelengths: growth, stress indicators and pigmentation Pedro J. Pires1*, Teresa M. Baptista2 and Renata N. Serradeiro3 1 Escola Superior de Turismo e Tecnologia do Mar, Portugal 2 MARE – Marine and Environmental Sciences Centre, Portugal 3 Aquacria Piscícolas S.A., Portugal The overfishing, the increased protein demand and growth of the world population, mean that the increase in animal production is crucial to counteract these problems. Nowadays, many authorities support that aquaculture is a way to overcome these problems and this activity has the highest global expansion rate. However new obstacles arise with this expansion, either the pressure to correspond to society's standards and regulatory authorities. The Senegalese sole, Solea senegalensis, has a great potential for aquaculture, since it has a high economic value. However presents several problems including, susceptibility to disease, nutritional requirements and great dispersion in the size, among others. The knowledge of the production requirements for this specie is crucial to increase its success and improve productivity in the culture of sole. To clarify some of the parameters this study took place to evaluate the effect of light of different wavelengths in growth as well as haematological and immunological parameters and further changes in skin colouring at Solea senegalensis. This test was carried out at Aquacria Piscícolas S.A. facilities using twenty-seven thousand young fish which were divided into six tanks with a recirculating aquaculture system (RAS) and maintained under intensive culture conditions. Blue light was used with a wavelength of 400nm, white light with a wavelength of 450nm and a red light coated film in the control group. To analyse growth, samples of two hundred fish per tank were made. For haematological and immunological parameters withdrew blood from six fish per tank. With regard to skin coloration fifty fish per treatment were used. In all aspects related to growth indicators, white light appears to promote a higher development, reaching a percentage of 112% growth when compared with SEA8 growth curve. In haematological and immunological parameters, the results show that there is a decrease in the percentage of lymphocytes and thrombocytes. However the high glucose levels indicate that the fish are under stress. The analysis of the staining of the skin shows that the fish held in the control group exhibit brighter colour, responsible for a clearer appearance. In conclusion, the blue light appears to have no beneficial effect on both, fish growth and skin coloration. The white light seems to influence positively fish growth and the control group has the most satisfactory results in terms of skin coloration. Keywords: Solea senegalensis, Wavelengths, stress, Pigmentation, Growth Conference: IMMR | International Meeting on Marine Research 2016, Peniche, Portugal, 14 Jul - 15 Jul, 2016. Presentation Type: Poster presentation Topic: Aquaculture Citation: Pires PJ, Baptista TM and Serradeiro RN (2016). Impact assessment in Solea senegalensis exposed to light of different wavelengths: growth, stress indicators and pigmentation. Front. Mar. Sci. Conference Abstract: IMMR | International Meeting on Marine Research 2016. doi: 10.3389/conf.FMARS.2016.04.00051 Copyright: The abstracts in this collection have not been subject to any Frontiers peer review or checks, and are not endorsed by Frontiers. They are made available through the Frontiers publishing platform as a service to conference organizers and presenters. The copyright in the individual abstracts is owned by the author of each abstract or his/her employer unless otherwise stated. Each abstract, as well as the collection of abstracts, are published under a Creative Commons CC-BY 4.0 (attribution) licence (https://creativecommons.org/licenses/by/4.0/) and may thus be reproduced, translated, adapted and be the subject of derivative works provided the authors and Frontiers are attributed. For Frontiers’ terms and conditions please see https://www.frontiersin.org/legal/terms-and-conditions. Received: 13 May 2016; Published Online: 13 Jul 2016. * Correspondence: Mr. Pedro J Pires, Escola Superior de Turismo e Tecnologia do Mar, Peniche, 2520-641, Portugal, ppires1992@gmail.com Login Required This action requires you to be registered with Frontiers and logged in. To register or login click here. Abstract Info Abstract The Authors in Frontiers Pedro J Pires Teresa M Baptista Renata N Serradeiro Google Pedro J Pires Teresa M Baptista Renata N Serradeiro Google Scholar Pedro J Pires Teresa M Baptista Renata N Serradeiro PubMed Pedro J Pires Teresa M Baptista Renata N Serradeiro Related Article in Frontiers Google Scholar PubMed Abstract Close Back to top Javascript is disabled. Please enable Javascript in your browser settings in order to see all the content on this page.

Facile synthesis of highly luminescent co-doped carbon nanodots for rapid, sensitive, and label-free detection of Hg2+

A simple, low-cost and straightforward hydrothermal method for synthesis of highly fluorescent nitrogen- and sulfur-co-doped carbon dots (N, S-CDs) has been developed via one-step pyrolysis of ethylenediaminetetraacetic acid salt (EDTA) and thiourea. The prepared N, S-CDs had an average size of 2.45±0.37nm and showed a strong emission at the wavelength of 450nm with an optimum excitation of 390nm. Comparing to the other metal ions, mercury ions (Hg2+) dramatically quenched the fluorescence of the N, S-CDs. Meanwhile, the fluorescence intensity displayed a good linear response with Hg2+ concentration in the range of 0–3.0×10−7M (R2=0.9997) and the detection limit was 1.37×10−9M. The cell viability results of Hela cells and the imaging experiments of Escherichia coli also certified that the N, S-CDs could be served as an effective fluorescent sensing probe for label-free sensitive and selective detection of Hg2+ in biological samples on account of their low toxicity and good biocompatibility.

Evaluation of the photodynamic therapy as a potential technique for blood decontamination

Evaluation of the photodynamic therapy as a potential technique for blood decontamination

Silicate micro-spheres modified with YPO4:Pr3+ particles: Possessing light diffusion and blue-light down-conversion properties

The silicate micro-spheres (SMS) were modified with YPO4:Pr3+ phosphor particles by a sol–gel method. Besides good light, diffusion property, the modified SMS augmented blue-light down-conversion function. The structure analyses showed that YPO4:Pr3+ particles were modified on the SMS by Y–O bond and YPO4:Pr3+ was well crystalline after annealing at 900°C. Photoluminescence test revealed that the emission peaks of SMS–YPO4:Pr3+ sample were at 529, 595, 617 and 648nm under excitation at a wavelength of 450nm. The SMS–YPO4:Pr3+ sample emitted red light under a blue LED lamp. The polycarbonate/SMS–YPO4:Pr3+ composites possess good light diffusion (78% of transmittance and 91% of haze) and blue-light down-conversion properties.

Verdet constant measurements of β-barium borate and lead molybdate crystals

Verdet constants of beta-barium borate (β-BaB2O4, BBO) and lead molybdate (PbMoO4, PMO) crystals are measured by comparing with that of terbium-doped glass. Measurement uncertainties caused by light intensity fluctuation, responsiveness drift of photo-detector and unstable amplifying ratio of signal processing circuits can be suppressed by comparative measurement method. Verdet constants of the BBO and PMO crystals respectively are 5.61 ± 0.17 rad.T−1.m−1 and 51.7 ± 1.5 rad.T−1.m−1 for light wavelength of 635nm.

The Suppression Effect of 830nm Laser Irradiation on Porous Silicon Formation

The suppression effect of 830nm laser irradiation is fuond on the formation of fine porous silicon, which used hydrofluoric acid (HF) containing electrolyte for electrochemical etching. The photoluminescence (PL) profile shows a single peak at 1.94 eV corresponding to red emission at room temperature. On the laser-irradiated surface, the suppression/etching rate was changed by the laser power. Our study shows that the suppression effect of laser irradiation on the porous silicon layer be considered to a feasible technology for fabricating a uniform sub-5 nm thick porous layer.The thickness of porous layer can be precisely controled by the intensity of laser power and etching time with a tolerance in minutes. In the study, we used 5×5 cm2, boron-doped, 1 to10 Ωcm, (100) Si specimens and the laser with wavelength of 830nm at maximum power of 5.0mW with beam size of 1.0mm. The laser institutional platform was added the polarizer to control the power of the laser beam. The power of laser was adjusted to1.0mW, 2.0mW, 3.0mW, 4.0mW, and 5.0mW in air at room temperature. In Fig. a and b, the pictures show the suppression of formation of porous silicon by the 830nm laser at 3.0mW after electrochemical etching in HF solution with current of 100mA for 10 minutes. The thickness of porous silicon varies of the outer region of laser-irradiated area could be observed by Field Emission Scanning Electron Microscope (FE-SEM). A straight-line slope of a porous silicon layer between the laser irradiation and non-laser irradiation that confirms the size of Gaussian beam with the suppression phenomenon of porous silicon. We called the propagating out profie of a Gaussian beam in the laser irradiation is the transition zone of porous silicon formation (TZPS). Figure 1

(Invited) Silicon Field Emitter Array Photocathode

The electron source generating density modulated electron beam (a train of electron beam pulses) at high frequency directly from the cathode surface has attracted significant interest since they could be used in a wide variety of vacuum electronics devices, such as compact microwave sources [1-4], ultrafast electron microscopy [5], or electron beam lithography [6]. In particular, bunching the electron beam at the cathode surface can not only dramatically reduce dimensions and weight through the elimination of the pre-modulation circuit, but can also provide extremely high efficiency and improve power in electron beam devices due to coherence effects. The high-frequency modulation of the gate potential of field emitter arrays (FEAs) has been proposed and studied for microwave tube applications [1]. However, challenges resulting from parasitic capacitances have still remained [7]. An alternative is producing electron bunches by optical means. The emission current from p-type semiconductor field emitter arrays, unlike metals, is limited by the supply of minority carriers (electrons) in the depletion region in the high field, and is, therefore, highly sensitive to the additional supply of photoexcited carriers. Several studies have revealed the transient photoresponse of p-type Si-FEAs was limited by diffusion of photogenerated electrons outside the surface depletion region in the tip [8-10]. To generate a high frequency modulated electron beam, we need to design the emitter structure which eliminates photoexcitation of carriers outside the depletion region. In this paper, we descuss the photoresponse of volcano-structured p-type Si-FEAs fabricated by etch-back technique, where the gate metal effectively prevents photoexitation of carriers outside the depletion region, under laser light illumination. Our Si-FEA devices tested here consist of 100 emitter tips, a gate aperture of less than a half micrometer in diameter and insulating layer of 200 nm thickness, as shown in Fig.1. In a proof-of-principle experiment, the FEA device was optically modulated from the front side. Figure 2 shows the typical current-voltage characteristics of our FEA device with and without laser pulse illumination of a wavelength of 405-nm. This result clearly suggests our device is a highly sensitive photocathode. In the dark, the emission current saturation by limitation in supply of electrons at high voltages is clearly displayed and the irradiation enhanced the emission current. Figure 3 shows the response of optically modulated emission current from our FEA device and a reference commercial photodetector. The rise and fall times of each pulse response are 5 ns, respectively. These values are similar to the minimum rise time of the current-voltage conversion amplifier used in this experiment, so the measured rise and fall times are determined by the response time of the current amplifier and the real rise and fall times of photoresponse in the device are at least less than 5 ns. A delayed slow response in the falling phase is not included in the component of the transient signal. Although optimization of the FEA structure is underway, it is experimentally demonstrated that the FEA photocathode is a structure suitable for minimizing the photogeneration of electrons outside the depletion layer, giving a high-speed modulated electron beam [11].

Relationship between Ca2+ concentration and the properties of codoped Gd3Ga3Al2O12:Ce scintillators

Codoping is a method of current interest for modifying the properties of scintillators. The study reported here explores the effect of codoping on cerium doped Gd3Ga3Al2O12 (GGAG:Ce) crystals with various concentrations of Ca. These single crystals were grown via the Czochralski technique with Ce concentrations fixed at 0.2at% and Ca concentrations ranging from 0.1at% to 0.4at% in the initial melt. The relationship between dopant concentration and light yield, rise time, and scintillation and photoluminescence decay times was determined. In addition, the absorbance, photoluminescence, radioluminescence, afterglow and thermoluminescence dependence on the dopant concentration are presented. In some of the Ca codoped crystals, an additional luminescence center was observed with an excitation wavelength of 350nm and an emission wavelength of 400nm and a photoluminescence decay time of ~3.5ns.

자외선/오존 조사에 의한 Poly(vinyl butyral)의 광산화

Poly(vinyl butyral), PVB was photooxidized by UV/ozone irradiation and the effect of UV energy on the surface properties of the UV-irradiated PVB film were investigated by the measurement of reflectance, surface roughness, contact angles, elemental composition, and zeta potential. With increasing UV energy, reflectance decreased in the visible and ultraviolet regions particularly at the wavelength of 400nm. The irradiation produced nano-scale surface roughness including the maximum peak-to-valley roughness increased from 274nm for the unirradiated PVB to 370nm at the UV energy of 5.3J/cm². The improved hydrophilicity was due to the higher O1s/C1s resulting from the introduction of polar groups such as C=O bonds. The surface energy of the PVB film increased from 35.3mJ/m² to 39.3mJ/m² at the irradiation of 15.9J/cm². While the zeta potentials decreased proportionally with increasing UV energy, the cationic dyeability of the PVB increased accordingly resulting from the improved affinity of the irradiated PVB surfaces containing the photochemically introduced anionic and dipolar dyeing sites.