scholarly journals Fabrication of graphene–ZnO heterostructure-based flexible and thin platform-based UV detector

2021 ◽  
Author(s):  
Ashish Kumar ◽  
Arathy Varghese ◽  
Vijay Janyani
Keyword(s):  
Indium Tin Oxide ◽  
Chemical Vapour ◽  
Rf Sputtering ◽  
Uv Detection ◽  
Uv Detector ◽  
Uv Illumination ◽  
Detection Analysis ◽  
Uv Lamp ◽  
Transfer Method ◽  
Grown Graphene

AbstractThis work presents the performance evaluation of Graphene/ZnO Schottky junctions grown on flexible indium tin oxide (ITO)-coated polyethylene terephthalate (PET) substrates. The fabricated structures include chemical vapour deposition grown graphene layer on ITO-coated PET substrates. Polymethyl methacrylate assisted transfer method has been employed for the successful transfer of graphene from Cu substrate to PET. The smaller D-band intensity (1350 cm−1) compared to G-band (1580 cm−1) indicates good quality of carbon lattice with less number of defects. High-quality ZnO has been deposited through RF sputtering. The deposited ZnO with grain size 50–95 nm exhibited dislocation densities of 1.31270 × 10–3 nm−2 and compressive nature with negative strain of − 1.43156 GPa. Further, the electrical and optical characterization of the devices has been done through device I–V characterization and UV detection analysis. The UV detection capability of the device has been carried out with the aid of a UV-lamp of 365 nm wavelength. The fabricated graphene/ZnO photodetector showed good response to UV illumination. The device performance analysis has been done through a comparison of the device responsivity and detectivity with the existing detectors. The detectivity and responsivity of the fabricated detectors were 7.106 × 109 mHz1/2 W−1 and 0.49 A W−1, respectively.

scholarly journals Characterization of Ag/ZnO Nanorod Schottky Diode-Based Low-Voltage Ultraviolet Photodetector

NANO ◽  
2017 ◽  
Vol 12 (05) ◽  
pp. 1750063 ◽  
Author(s):  
Shaivalini Singh ◽  
S. Jit ◽  
Si-Hyun Park
Keyword(s):  
Indium Tin Oxide ◽  
Low Voltage ◽  
Zno Nanorods ◽  
Contrast Ratio ◽  
Cost Effective ◽  
Hexagonal Structure ◽  
Schottky Contacts ◽  
Uv Detection ◽  
Glass Substrates ◽  
Uv Illumination

Ultraviolet (UV) detection characteristics of Ag Schottky contacts with ZnO nanorods (ZnO-NRs) grown on Indium Tin Oxide (ITO)-coated glass substrates have been investigated. A low-temperature hydrothermal method was used for growing ZnO-NRs. Circular contacts of Ag were deposited above the ZnO-NRs/ITO samples using the shadow mask technique. The structural properties of the ZnO-NRs were characterized by using scanning electron microscopy (SEM), atomic force microscope (AFM) and X-ray diffraction (XRD). The results revealed a (0002) crystal orientation and a wurtzite hexagonal structure. The electrical characteristics of the Ag/ZnO-NR Schottky contacts were studied at forward applied bias over the range 0[Formula: see text]V to 1[Formula: see text]V, under dark and UV illumination. The dark and photocurrents were [Formula: see text][Formula: see text]A and [Formula: see text][Formula: see text]A, respectively, and the contrast ratio (ratio of photocurrent to dark current) was 1.67 at [Formula: see text]1.0[Formula: see text]V for these devices. The results show that these devices could be useful for cost-effective and low-voltage UV detection applications.

scholarly journals Near-IR transparent conductive amorphous tungsten oxide thin layers by non-reactive radio-frequency magnetron sputtering

2021 ◽  
Vol 255 ◽  
pp. 05003
Author(s):  
Hao Chen ◽  
Alessandro Chiasera ◽  
Cristina Armellini ◽  
Giorgio Speranza ◽  
Stefano Varas ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Figure Of Merit ◽  
Rf Sputtering ◽  
Thin Layers ◽  
Radio Frequency Magnetron Sputtering ◽  
Amorphous Thin Films ◽  
Near Ir ◽  
Electric Contacts

Key assets for transparent electric contacts in optoelectronic applications are high conductivity and large transparency over extended spectral range. Indium-Tin-Oxide and Aluminium-doped-Zinc-oxide are commercial examples, with their electrical conductivity resembling those of metals, despite, their transparency being limited up to 1.5µm. This work introduces smooth and compact amorphous thin films of n-type semiconducting WO3-x prepared by RF-sputtering followed by annealing in dry air, as optical layers of tailorable dielectric properties. We evaluate Figure of Merit, combining electrical conductivity and optical transparency, and rate the performances as a transparent conductive layer.

Cu/MoS2/ITO based hybrid structure for catalysis of hydrazine oxidation

RSC Advances ◽  
2015 ◽  
Vol 5 (20) ◽  
pp. 15374-15378 ◽  
Author(s):  
Sajjad Hussain ◽  
Kamran Akbar ◽  
Dhanasekaran Vikraman ◽  
Muhmmad Arslan Shehzad ◽  
Seunho Jung ◽  
...  
Keyword(s):  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Rf Sputtering ◽  
Hybrid Structure ◽  
Annealing Process ◽  
Large Area ◽  
Post Annealing ◽  
Hydrazine Oxidation

We have successfully demonstrated large-area and continuous MoS2 films grown on indium tin oxide (ITO) substrates by RF sputtering followed by a post-annealing process.

Simultaneous magnetic dispersive micro solid phase extraction of valsartan and atorvastatin using a CMC-coated Fe3O4 nanocomposite prior to HPLC-UV detection: multivariate optimization

2019 ◽  
Vol 43 (43) ◽  
pp. 16950-16959 ◽  
Author(s):  
Ali Azadi ◽  
Shahin Ahmadi
Keyword(s):  
Solid Phase Extraction ◽  
Solid Phase ◽  
Biological Fluids ◽  
Uv Detection ◽  
Phase Extraction ◽  
Multivariate Optimization ◽  
Uv Detector ◽  
Practical Procedure

In this study, a sensitive, rapid, accurate and practical procedure is established for determination of atorvastatin and valsartan from human biological fluids by dispersive micro solid phase extraction (D-μ-SPE) combined with HPLC-UV detector.

scholarly journals Chemical Vapour Deposition of Graphene for Durable Anticorrosive Coating on Copper

Nanomaterials ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 2511
Author(s):  
Dali Ji ◽  
Xinyue Wen ◽  
Tobias Foller ◽  
Yi You ◽  
Fei Wang ◽  
...  
Keyword(s):  
Chemical Vapour Deposition ◽  
Vapour Deposition ◽  
Electrochemical Impedance ◽  
Pure Copper ◽  
Chemical Vapour ◽  
Source Surface ◽  
Layer Graphene ◽  
Chemical Inertness ◽  
Grown Graphene ◽  
One Year

Due to the excellent chemical inertness, graphene can be used as an anti-corrosive coating to protect metal surfaces. Here, we report the growth of graphene by using a chemical vapour deposition (CVD) process with ethanol as a carbon source. Surface and structural characterisations of CVD grown films suggest the formation of double-layer graphene. Electrochemical impedance spectroscopy has been used to study the anticorrosion behaviour of the CVD grown graphene layer. The observed corrosion rate of 8.08 × 10−14 m/s for graphene-coated copper is 24 times lower than the value for pure copper which shows the potential of graphene as the anticorrosive layer. Furthermore, we observed no significant changes in anticorrosive behaviour of the graphene coated copper samples stored in ambient environment for more than one year.

Paramagnetic Defect Analysis in UV Lamp Induced Chemical Vapour Deposited a-SiO2 Films

1992 ◽  
Vol 284 ◽  
Author(s):  
C. Debauche ◽  
C. Licoppe ◽  
J. Flicstein ◽  
R. A. B. Devine
Keyword(s):  
Chemical Vapour Deposition ◽  
Vapour Deposition ◽  
High Pressures ◽  
Chemical Vapour ◽  
Chemical Species ◽  
Electron Spin Resonance Study ◽  
Paramagnetic Defect ◽  
Spin Resonance ◽  
Uv Lamp ◽  
Spin Resonance Study

ABSTRACTAn electron spin resonance study has been carried out on a-SiO2 films deposited from SiH4 and N2O gases using UV lamp induced chemical vapour deposition. Deposition pressures have been varied from 5 torr to 30 torr whilst the substrate temperature was maintained at 240°C. Bridging nitrogen (O3≡Si-N-Si≡O3) and oxygen-vacancy center defects are observed in small quantities (≈ 1016cm−3) whilst over coordinated N defects are observed in concentrations up to 1018 cm−3 dependent upon the deposition pressure. The concentration of these defects can be dramatically reduced either by depositing the a-SiO2 at high pressures (≈ 30 torr) or by post-deposition annealing at ≈ 600°C. Comparison with data on films produced by plasma enhanced chemical vapour deposition demonstrates that the mode of incorporation of nitrogen into the network depends critically upon the chemical species in the deposition reactor.

scholarly journals Surface Modification of Aerosol-Assisted CVD Produced TiO2Thin Film for Dye Sensitised Solar Cell

2014 ◽  
Vol 2014 ◽  
pp. 1-12 ◽  
Author(s):  
SuPei Lim ◽  
Nay Ming Huang ◽  
Hong Ngee Lim ◽  
M. Mazhar
Keyword(s):  
Thin Films ◽  
Solar Cell ◽  
Conversion Efficiency ◽  
Indium Tin Oxide ◽  
Particle Deposition ◽  
Chemical Vapour ◽  
Photocurrent Density ◽  
Potential Candidate ◽  
Visible Absorption ◽  
Ag Particle

We report a simple and convenient method for the preparation of Ag/TiO2thin films supported on indium tin oxide, which was achieved by sonochemical deposition of Ag+on aerosol-assisted chemical vapour deposited TiO2thin films. Posttreatment was performed on the film by immersion in HCl. The as-prepared composite film was characterised by X-ray diffraction, ultraviolet-visible absorption spectroscopy, Raman spectroscopy, and field emission scanning electron microscopy. The photoelectrochemical measurements andJ-Vcharacterisation showed approximately fivefold increase in photocurrent density generation and approximately sevenfold enhancement in dye sensitiser solar cell (DSSC) conversion efficiency, which was achieved after modification of the TiO2film with HCl posttreatment and Ag particle deposition. The improved photocurrent density of 933.30 μA/cm2, as well as DSSC power conversion efficiency of 3.63% with high stability, is an indication that the as-synthesised thin film is a potential candidate for solar energy conversion applications.

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