Ultraviolet-visible Spectrometer Research Articles

Effect of Carbon Nanotubes' Dimension on Microwave Absorption Property of Polyaniline Nanocomposites

Hexanoic acid (HA) doped PAni nanocomposites which containing aniline (Ani) as monomer was synthesized via template free method. Dielectric (titanium dioxide, TiO2) and magnetic (different dimension of multiwall carbon nanotubes (MWNT)) materials have been added to improve the dielectric and magnetic behavior of the PAni nanocomposites. Fourier transform infrared (FTIR) spectrometer, ultraviolet-visible (UV-Vis) spectrometer and X-ray diffractometer (XRD) analysis confirmed the chemical structure of doped-PAni. Morphology study and thermal behavior of the PAni nanocomposites have been investigated by field emission scanning electron microscope (FESEM) and thermal gravimetric analyzer (TGA), respectively. PAni nanocomposites with longer length and bigger diameter of MWNT possess the highest conductivity (1.51 × 10−2 S/cm) compared with those shorter length and smaller diameter PAni nanocomposites. Microwave absorption study was investigated by microwave vector network analyzer (MVNA) from 0.5 to 18 GHz. Among all the PAni nanocomposites, PAni nanocomposites with MWNT (φ = 10–20 nm, l = 5–15 μm) possess a sharp and narrow peak with high absorption (RL = −58 dB) at 7 GHz. In this study, it is observed that PAni nanocomposites with longer length and smaller diameter exhibit the largest amount of entangled nanorods/nanotubes that will eventually enhance the heterogeneity of the nanocomposites. Thus, it significantly induces the space charge polarization along the PAni backbone and indicates the strongest microwave absorption.

Application of Fiber Bragg Grating Sensor coated with Polyaniline as an optical Sensor for chloroform detection

Fiber Bragg Grating (FBG) sensor coated with PAni was designed as a sensing device in chloroform detection. PAni thin film was synthesized through chemical oxidation method by using aniline (Ani) as a monomer, ammonium persulphate (APS) as an initiator and dioctyl sodium sulfosuccinate (AOT) as a dopant. The chemical structure of PAni thin film was confirmed by using Fourier transform infrared (FTIR) and ultraviolet-visible (UV-Vis) spectrometer. The conducting behaviour of PAni thin film (1.157 × 10−2 S/cm) was determined by using four-point probe measurement. In the optical sensor part, FBG was etched in hydrofluoric acid solution (48% HF) to remove the cladding layer on fiber before coated with PAni. The response of this sensor was monitored based on the different of Bragg wavelength shift at ∼1557 nm in an optical spectrum analyzer (OSA) detector. PAni-coated FBG significantly increased in the Bragg wavelength shift (sensitivity = 0.0009) compared with uncoated FBG (sensitivity = 0.0002). The interaction between PAni and chloroform was significantly confirmed by the “polaron peak ratio” (Pf/Pi) and “quinoid and benzenoid peak ratio” (IQ/ IB) through UV-vis and FTIR spectroscopy analysis. In this study, FBG sensor coated with PAni thin film had been found as an efficient sensor in chloroform detection with fast response time (7 s).

Application of a Palm Oil-Based Alkyd for the Improvement of Polyaniline Properties

This study attempts to produce polyaniline (PAni)/Alkyd films with short curing time, good adhesion on fluoride-doped tin oxide (FTO) glass and having high conductivity that can be apply in solar cell panel. Both palm stearin-based alkyd resins and PAni were synthesized via chemical reactions. Chemical structures of the palm oil-based alkyd and PAni were investigated by proton nuclear magnetic resonance (1H NMR), Fourier Transform Infrared (FTIR), and Ultraviolet-visible (UV-vis) spectrometers. Palm oil-based alkyds having three different acid number (AN) (5.66, 14.74, and 17.60 mg KOH/g) were blended with PAni at ratio of 1:0.5, 1:0.75, 1:1 for the preparation of PAni/Alkyd films via UV curing method. UV-vis spectrometer confirmed the chemical structure of PAni/Alkyd films. The adhesion of Pani/Alkyd films were tested following ASTM D3359 and conductivity study of PAni/Alkyd films was carried out using four point probe method. Best result was observed for PAni/ Alkyd at a ratio 1:0.5 with the palm oil-based alkyd having AN value of 5.56 mg KOH/g. The shortest curing time was 10 minutes, with strong adhesion of PAni/Alkyd films on FTO glass and conductivity of 2.56102S/cm. By comparison the conductivity of the pure PAni was 1.31×103S/cm.

Chemical modification of rose leaf with polypyrrole for the removal of Pb (II) and Cd (II) from aqueous solution

ABSTRACTThe rose leaf was successfully modified through coating with polypyrrole (PPy) in chemical oxidative route in order to remove Pb(II) and Cd(II) from aqueous media. The rose leaf/polypyrrole (RL/PPy) composites were characterized in terms of morphology, chemical structure, and conductivity properties. The spectrum were obtained from FTIR results which support the formation of RL/PPy composites. FTIR and SEM results indicate that the polypyrrole is completely covered on rose leaf. The conductivity of composite (1.8215 S/cm) was higher than polypyrrole (2.06 × 10−3 S/cm). The metal removal studies were monitored by Ultraviolet Visible Absorption Spectrometer (UV-Vis). The optimum conditions were detected for adsorption by changing some experimental conditions (such as adsorbent dosage, contact time and stirring speed, initial concentration of the metal solutions and pH). Following the determination of the optimum conditions, the results of the metal removal from wastewater studies were performed by Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES). Under the optimum conditions, the ICP-OES results obtained for waste water showed the useability of composite for the removal of Pb(II) and Cd(II). The Langmuir and Freundlich models are subjected to adsorption datas. The datas fitted better when by using Freundlich model.

Rapid Biological Synthesis of Silver Nanoparticles from Ocimum sanctum and Their Characterization

With development of nanotechnology, the biological synthesis process deals with the synthesis, characterization, and manipulation of materials and further development at nanoscale which is the most cost-effective and eco-friendly and rapid synthesis process as compared to physical and chemical process. In this research silver nanoparticles (AgNPs) were synthesized from silver nitrate (AgNO3) aqueous solution through eco-friendly plant leaf broth of Ocimum sanctum as reactant as well as capping agent and stabilizer. The formation of AgNPs was monitored by ultraviolet-visible spectrometer (UV-vis) and Fourier transform infrared (FTIR) spectroscopy. X-ray diffraction (XRD) and scanning electronic microscopy (SEM) have been used to characterize the morphology of prepared AgNPs. The peaks in XRD pattern are in good agreement with that of face-centered-cubic (FCC) form of metallic silver. Thermal gravimetric analysis/differential thermal analysis (TGA/DTA) results confirmed the weight loss and the exothermic reaction due to desorption of chemisorbed water. The average grain size of silver nanoparticles is found to be 29 nm. The FTIR results indicated that the leaf broths containing the carboxyl, hydroxyl, and amine groups are mainly involved in fabrication of silver AgNPs and proteins, which have amine groups responsible for stabilizing AgNPs in the solution.

Radio frequency magnetron sputter deposited ZnO films doped with Al, Ga and Ti

Zinc oxide (ZnO) is a key material in the field of transparent large-area electronics. Some of the ZnO applications in large-area electronics include sensors, transistors and solar cells. In this work, ZnO films doped with aluminium (Al), gallium (Ga) and titanium (Ti) with different doping concentrations were deposited on glass substrates via the radio frequency (R.F.) plasma magnetron sputtering technique. The correlations of different doping concentration with the structural, optical and electrical properties were investigated by Atomic Force Microscopy, Ultraviolet–Visible Spectrometer and Hall Electronic Transport Measurement System, respectively.

Al-doped ZnO films deposited by magnetron sputtering: effect of sputtering parameters on the electrical and optical properties

Abstract Aluminum-doped zinc oxide (AZO) thin films were prepared by magnetron sputtering method. The influences of deposition pressure, substrate temperature, Ar flow rate and film thickness on optical and electrical properties were investigated using ultraviolet-visible (UV-Vis) spectrometer and Hall measurements. The experimental results revealed that a low resistivity, smaller than 4 × 10-4 Ω·cm, was obtained when the deposition pressure was smaller than 0.67 Pa and substrate temperature about 200 °C. Ar flow rate had a small influence on the resistivity but a big influence on the transparency at near infrared range (NIR). We obtained optimized AZO thin films with high ponductivity and transparency at low deposition pressure, small Ar flow and appropriate temperature (around 200 °C). The etching behavior of the AZO thin films deposited at the different Ar flow rates was also studied in this paper. The results show that Ar flow rate is a very important factor affecting the etching behavior.

3DGH-Fc based electrochemical sensor for the simultaneous determination of ascorbic acid, dopamine and uric acid

In this work, we have been successfully developed a new electrochemical sensor for the simultaneous determination of ascorbic acid (AA), dopamine (DA) and uric acid (UA) using ferrocene hybrid (Fc)/three dimensional graphene hydrogel (3DGH) nanocomposite. The composite materials were characterized using different techniques, such as scanning electron microscopy (SEM), atomic force microscopy (AFM), ultraviolet-visible spectrometer (UV–vis). The electrochemical detection methods using for the individual and simultaneous detection of AA, DA and UA were cyclic voltammetry (CV), differential pulse voltammetry (DPV) and amperometric (i–t). Due to the excellent properties and unique structure of the nanocomposite, this sensor exhibited sharp peaks for the oxidation of AA, DA and UA as compared with the bare glassy carbon electrode (GCE). The linear responses of AA, DA and UA were observed from 20 to 450μM, 10–180μM and 8–400μM with detection limits (S/N=3) of 0.183μM (AA), 0.042μM (DA) and 0.067μM (UA), respectively. In addition, the developed 3DGH-Fc/GCE electrode showed well anti-interference ability, great stability and excellent reproducibility. Moreover, the analytical application of this electrochemical sensor was successfully conducted for the determination of these species in human serum samples. These features implicate the potential applicability of the developed 3DGH-Fc/GCE biosensor in the development of is promising for the simultaneous determination of DA, AA and UA.

Rapid detection of hazardous H2O2 by biogenic copper nanoparticles synthesized using Eichhornia crassipes extract

Here we present a simple, clean and eco-friendly synthesis procedure of copper nanoparticles from copper sulphate solution using flower extract of Eichhornia crassipes along with its hydrogen peroxide detectability study. Production of copper nanoparticles was initially verified by scanning the reacting solution under ultraviolet visible (UV–Vis) spectrometer. The pattern of X-ray diffraction (XRD) showed different phases and crystallinity of these biogenic nanoparticles. Size and morphology of copper nanoparticles were examined by high resolution transmission electron microscopy (HRTEM). Result of Fourier transform infra-red (FTIR) spectroscopy helped to identify the organic molecules which capped and stabilized the colloidal particles in the solution during production. In addition, the H2O2 sensing ability of these bioengineered copper nanoparticles was tested and the suspension of Cu nanoparticles was observed to detect the hazardous hydrogen peroxide instantly.

Photocatalytic conversion of CO2 into methanol using graphitic carbon nitride under solar, UV laser and broadband radiations

Summary Photocatalytic conversion of carbon dioxide into methanol using highly efficient g-C3N4, in conjunction with three different radiations (solar radiation, broad-band ultraviolet (UV)–visible lamp, and laser beam) is presented. The optical, structural, and morphological properties of the synthesized g-C3N4 were studied using advanced analytical techniques like Fourier transform infrared spectroscopy, UV–visible spectrometer, X-ray diffraction, high-resolution transmission electron microscopy, high-angle annular dark field, and X-ray photoelectron spectroscopy. The relative merits of the three sources of radiation in the presence of g-C3N4 were studied in terms of key figures of merit of the photocatalytic process, namely, methanol production yield and quantum yield. As expected, after 40 min of irradiation, 355-nm laser (40 mJ/pulse, 10 Hz) with g-C3N4 rendered the best methanol production yield (510 μmol g−1 h−1), followed by solar radiation (130 μmol g−1 h−1), and UV broadband lamp. This indicates that the photon flux and the spectral properties of incident light are the key factors for the enhancement of methanol production yield. Although the methanol production yield with 355-nm laser radiation is quite impressive because of the inherent high photon flux and the monochromatic nature of laser, the methanol yield of 130 μmol g−1 h−1 with natural sunlight is quite an important result, as it can be used for the development of large-scale solar fuel generation facilities by harnessing the naturally abundant solar radiation. Copyright © 2017 John Wiley & Sons, Ltd.

Study of structural properties and defects of Ni-doped SnO2 nanorods as ethanol gas sensors

An ethanol gas sensor with enhanced sensor response was fabricated using Ni-doped SnO2 nanorods, synthesized via a simple hydrothermal method. It was found that the response (R = R0/Rg) of a 5.0 mol% Ni-doped SnO2 (5.0Ni:SnO2) nanorod sensor was 1.4 × 104 for 1000 ppm C2H5OH gas, which is about 13 times higher than that of pure SnO2 nanorods, (1.1 × 103) at the operating temperature of 450 °C. Moreover, for 50 ppm C2H5OH gas, the 5.0Ni:SnO2 nanorod sensor still recorded a significant response reading, namely 2.0 × 103 with a response time of 30 s and recovery time of 10 min. To investigate the effect of Ni dopant (0.5–5.0 mol%) on SnO2 nanorods, structural characterizations were demonstrated using field emission scanning electron microscopy, high-resolution transmission electron microscopy, Fourier transform infrared spectroscopy, x-ray diffraction (XRD) analysis, x-ray photoelectron spectroscopy and an ultraviolet–visible spectrometer. XRD results confirmed that all the samples consisted of tetragonal-shaped rutile SnO2 nanorods. It was found that the average diameter and length of the nanorods formed in 5.0Ni:SnO2 were four times smaller (∼6 and ∼35 nm, respectively) than those of the nanorods formed in pure SnO2 (∼25 and 150 nm). Interestingly, both samples had the same aspect ratio, ∼6. It is proposed that the high response of the 5.0Ni:SnO2 nanorod sensor can be attributed to the particle size, which causes an increase in the thickness of the charge depletion layer, and the presence of oxygen vacancies within the matrix of SnO2 nanorods.

Effects of polymer surface energy on morphology and properties of silver nanowire fabricated via nanoimprint and E-beam evaporation

In this paper, we demonstrate that use of different nanoimprint resins as a polymer pattern has a significant effect on the morphology of silver (Ag) nanowires deposited via an E-beam evaporator. RM-311 and Ormo-stamp resins are chosen as a polymer pattern to form a line with dimensions of width (100nm)×space (100nm)×height (120nm) by using nanoimprint lithography (NIL). Their contact angles are then measured to evaluate their surface energies. In order to compare the properties of the Ag nanowires deposited on the various polymer patterns with different surface energies, hydrophobic surface treatment of the polymer pattern surface is implemented using self-assembled monolayers. In addition, gold and aluminum nanowires are fabricated for comparison with the Ag nanowires, with the differences in the nanowire morphologies being determined by the different atomic properties. The monocrystalline and polycrystalline structures of the various Ag nanowire formations are observed using transmission electron microscopy. In addition, the melting temperatures and optical properties of four kinds of Ag nanowire morphologies deposited on various polymer patterns are evaluated using a hot plate and an ultraviolet-visible (UV–vis) spectrometer, respectively. The results indicate that the morphology of the Ag nanowire determines the melting temperature and the transmission. We believe that these findings will greatly aid the development of NIL, along with physical evaporation and chemical deposition techniques, and will be widely employed in optics, biology, and surface wettability applications.

Preparation of SiO2@Ag Composite Nanoparticles and Their Antimicrobial Activity.

At normal atmospheric temperature, the modified sol–gel method was employed to synthesize SiO2 nanospheres (SiO2 NSs) whose average size was about 352 nm. Silver nanoparticles (Ag NPs) were uniformly distributed on the surface of SiO2 nanospheres (SiO2 NSs) by applying chemical reduction method at 95 °C and the size of silver nanoparticles (Ag NPs) could be controlled by simply tuning the reaction time and the concentration of sodium citrate. Besides, the size, morphology, structure and optical absorption properties of SiO2@Ag composite nanoparticles were measured and characterized by laser particle size analyzer (LPSA), transmission electron microscope (TEM), scanning electron microscope (SEM), X-ray diffraction (XRD) and ultraviolet visible absorption spectrometer (UV-Vis), respectively. Furthermore, antimicrobial effect experiments that against gram-negative bacteria (E. coli) and gram-positive bacteria (S. aureus) were carried out to characterize the antibacterial activity of synthesized SiO2@Ag composite nanoparticles. The results show that the prepared SiO2@Ag composite nanoparticles have strong antimicrobial activity, which is associated with the size of silver nanoparticles.

Facile preparation of fluorescent gold nanocluster via polysaccharide-templated approach and its application for Cu2+ sensing

In this report, we have constructed a simple, eco-friendly and one-pot synthetic strategy for the synthesis of fluorescent gold nanoclusters (GNCs) using a native polysaccharide (chondroitin sulfate) as the novel template. Moreover, we used some analytical instruments for characterizing the formation of Au clusters, containing ultraviolet-visible spectrometer, fluorescence spectrometer, high resolution transmission electron microscope (HRTEM) and X-ray photoelectron spectroscopy (XPS). The obtained data indicated that the Au nanoclusters were successfully formed. The chondroitin sulfate-capped gold nanoclusters (CS-GNCs) displayed excitation and emission bands at 450 and 520nm, respectively. The fluorescence quantum yield was 4.78%. We further used CS-stabilized gold nanoclusters selectively and sensitively for sensing Cu2+ in real samples via non-covalent d10-d10 metallophilic bond. The linear range of the method was 0.01–1.8μM with the limit of detection (LOD) was 8nM (signal/noise=3), and the recoveries of the spiked samples in lake water and tap water samples ranged from 90% to 108%, suggesting that the proposed method could be used in the practice detection of Cu2+.

Geochemistry Features of Oil-Gas Inclusions and UV-VIS Micro-spectra Analysis of Single Oil-Gas Inclusions in Bai 95 Oil Well

Geochemistry features including homogenization temperature (Th), salinity (S), grains containing oil-gas inclusions (GOIs), and polarized fluorescence microscope identification of oil and gas inclusions (OGIs) of Bai 95 oil well (localized in Jilin Oil Field, Songliao Basin, Northeast China) were obtained. The oil and gas charging, maturities of palaeo oil and gas, and the features of maternal source rocks related to three strata of Bai 95 oil well were estimated. A low cost measurement system combing a common inverted fluorescence microscope (IMF) and an ultravioletvisible (UV-VIS) spectrometer together was used to measure the micro-spectra of single OGIs. A minimum focus spot with 12 μm was obtained. The fluorescence interference from background was greatly decreased by subtracting the fluorescence from background. The micro-spectra from single OGIs take more information than that of traditional fluorescence spectra. The calculated Commission Internationale de l’Eclairage (CIE) chromaticity coordinates of the single OGIs by VIS spectra are more objective than judging colors of OGIs by human eyes. The main aromatic constitutes in the single OGIs were estimated by the UV-VIS spectra. With the buried depth increasing, the fluorescence peaks have red shifts; the aromatic hydrocarbons tend to become heavy. The UV-VIS spectra showed that there may be two maternal sources charging the strata in the second episode, one is mature, the other is low mature. This result coincides with the analysis result from geochemistry. Our experimental results showed this technique is a low cost, reliable and promising technique in measuring the UV-VIS fluorescence spectra of micro samples. The main aromatic hydrocarbons, the maturity of palaeo oil gas and the features of the maternal sources can be estimated by UV-VIS micro-spectroscopy of single OGIs.

Facile preparation of high refractive index polymer films composited with a tungstophosphoric acid

In this study, transparent, colorless polymer composites of polyvinyl alcohol (PVA) and tungstophosphoric acid (PWA) with high refractive indices were developed. The composite films were prepared on glass, using a facile spin-coating method, from an aqueous mixture of PVA and PWA without surfactants. The optical properties of the obtained films were investigated using an ultraviolet-visible absorption spectrometer and a prism coupler. Resultant PVA/PWA (90wt%) composite films exhibited high transparency (90%T) in the visible region and had a high refractive index (n=1.72). These PVA/PWA films were also compared to corresponding composite films of PVA and titanium oxide (TiO2).

A Comparative Study on Structural and Optical Properties of ZnO Micro-Nanorod Arrays Grown on Seed Layers Using Chemical Bath Deposition and Spin Coating Methods

In this study, Zinc Oxide (ZnO) seed layers were prepared on Indium Tin Oxide (ITO) substrates by using Chemical Bath Deposition (CBD) method and Sol-gel Spin Coating (SC) method. ZnO micro-nanorod arrays were grown on ZnO seed layers by using Hydrothermal Synthesis method. Seed layer effects of structural and optical properties of ZnO arrays were characterized. X-ray diffractometer (XRD), Scanning Electron Microscopy (SEM) and Ultraviolet Visible (UV-Vis) Spectrometer were used for analyses. ZnO micro-nanorod arrays consisted of a single crystalline wurtzite ZnO structure for each seed layer. Besides, ZnO rod arrays were grown smoothly and vertically on SC seed layer, while ZnO rod arrays were grown randomly and flower like structures on CBD seed layer. The optical absorbance peaks found at 422 nm wavelength in the visible region for both ZnO arrays. Optical bandgap values were determined by using UV-Vis measurements at 3.12 and 3.15 eV for ZnO micro-nanorod arrays on CBD seed layer and for ZnO micro-nanorod arrays on SC-seed layer respectively. DOI: http://dx.doi.org/10.5755/j01.ms.22.4.13443

Structural, morphological, optical and gas sensing properties of pure and Ce doped SnO2 thin films prepared by jet nebulizer spray pyrolysis (JNSP) technique

Pure and cerium (Ce) doped tin oxide (SnO2) thin films are prepared on glass substrates by jet nebulizer spray pyrolysis technique at 450 °C. The synthesized films are characterized by X-ray diffraction (XRD), scanning electron microscopy, energy dispersive analysis X-ray, ultra violet visible spectrometer (UV–Vis) and stylus profilometer. Crystalline structure, crystallite size, lattice parameters, texture coefficient and stacking fault of the SnO2 thin films have been determined using X-ray diffractometer. The XRD results indicate that the films are grown with (110) plane preferred orientation. The surface morphology, elemental analysis and film thickness of the SnO2 films are analyzed and discussed. Optical band gap energy are calculated with transmittance data obtained from UV–Visible spectra. Optical characterization reveals that the band gap energy is found decreased from 3.49 to 2.68 eV. Pure and Ce doped SnO2 thin film gas sensors are fabricated and their gas sensing properties are tested for various gases maintained at different temperature between 150 and 250 °C. The 10 wt% Ce doped SnO2 sensor shows good selectivity towards ethanol (at operating temperature 250 °C). The influence of Ce concentration and operating temperature on the sensor performance is discussed. The better sensing ability for ethanol is observed compared with methanol, acetone, ammonia, and 2-methoxy ethanol gases.

ZnO-Layered Double Hydroxide@Graphitic Carbon Nitride Composite for Consecutive Adsorption and Photodegradation of Dyes under UV and Visible Lights.

In this work, a ZnO-layered double hydroxide@graphitic carbon nitride composite (ZnO-LDH@C3N4) was synthesized via co-precipitation method with solvothermal treatment. The structure and morphology of ZnO-LDH@C3N4 composite were characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopes/transmission electron microscopes (SEM/TEM), N2 adsorption/desorption, ultraviolet visible diffuse reflectance spectroscopy (UV-Vis-DRS), photoluminescence spectrometer (PL) and electrochemical impedance spectroscopy (EIS). The adsorption and photocatalytic properties of ZnO-LDH@C3N4 composite towards the organic dyes: Orange II sodium salt (OrgII, an anionic azo dye) and methylene blue (MB, a cationic azo dye) were investigated. Compared to ZnO-LDH and g-C3N4, the ZnO-LDH@C3N4 composite displayed an excellent performance in both adsorption and photocatalytic degradation of the organic dyes. Moreover, a combination of ZnO-LDH and g-C3N4 significantly improved the photocatalytic performance of ZnO-LDH and g-C3N4 under visible-light irradiation. The adsorption and photocatalytic mechanism were also investigated.

Rapid and label-free bioanalytical method of alpha fetoprotein detection using LSPR chip

Alpha fetoprotein (AFP) is a cancer marker, particularly for hepatocellular carcinoma. Normal levels of AFP are less than 20ng/mL; however, its levels can reach more than 400ng/mL in patients with HCC. Enzyme linked immunosorbent assay (ELISA) and radioimmunoassay (RIA) have been employed for clinical diagnosis of AFP; however, these methods are time consuming and labor intensive. In this study, we developed a localized surface plasmon resonance (LSPR) based biosensor for simple and rapid detection of AFP. This biosensor consists of a UV–Vis spectrometer, a cuvette cell, and a biosensor chip nanopatterned with gold nanoparticles (AuNPs). In our LSPR biosensor, binding of AFP to the surface of the sensor chip led to an increasing magnitude of the LSPR signals, which was measured by an ultraviolet-visible (UV–Vis) spectrometer. Our LSPR biosensor showed sufficient detectability of AFP at concentrations of 1ng/mL to 1μg/mL. Moreover, the overall procedure for detection of AFP was completed within 20min. This biosensor could also be utilized for a point of care test (POCT) by employing a portable UV–Vis spectrometer. Owing to the simplicity and rapidity of the detection process, our LSPR biosensor is expected to replace traditional diagnostic methods for the early detection of diseases.