Synthesis of Cu doped ZnO nanorods for photosensitive UV detection application (original) (raw)
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UV-Photodetectors based on CuO/ZnO nanocomposites
Materials Letters, 2018
CuO/ZnO nanocomposites were prepared by a simple, low temperature hydrothermal method and followed by anodization technique on Indium-doped tin oxide (ITO) coated on the glass substrate. The prepared sample was characterized by field emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and UV-vis. All results confirmed the deposition of CuO on the surface of ZnO nanorod arrays. Further, CuO/ZnO nanocomposite-based UV photodetectors were characterized by standard I-V curves. As a result, CuO/ZnO nanocomposite devices exhibited high responsivity, photocurrent gain, and good reliability as compared to pure ZnO nanorod devices. Therefore, the nanocomposites of CuO/ZnO devices show good promise for UV photodetectors with possibility to fine-tune properties, and it is worthy of further investigation.
Copper Doped ZnO Thin Film for Ultraviolet Photodetector with Enhanced Photosensitivity
MRS Proceedings, 2013
ABSTRACTUltraviolet photoconductivity in Copper doped ZnO (Cu:ZnO) thin films synthesized by sol-gel technique is investigated. Response characteristics of Pure ZnO thin film and Cu:ZnO thin film UV photodetector with 1.3 at. wt % Cu doping biased at 5 V for UV radiation of λ = 365 nm and intensity = 24 µwatt/cm2 has been studied. Cu:ZnO UV photodetector is found to exhibit a high photocoductive gain (K = 1.5×104) with fast recovery (T90% = 23s) in comparison to pure ZnO thin film based photodetector (K = 4.9×101 and T90% = 41s). Cu2+ ions have been substituted in ZnO lattice which has been confirmed by X-ray diffraction (XRD) and Raman spectroscopy leading to lowering of dark current (Ioff ∼ 1.44 nA). Upon UV illumination, more electron hole pairs are generated in the photodetector due to the high porosity and roughness of the surface of the film which favours adsorption of more oxygen on the surface of the photodetector. The photogenerated holes recombined with the trapped electro...
UV detecting properties of hydrothermal synthesized ZnO nanorods
Physica E: Low-dimensional Systems and Nanostructures, 2011
The photoresponse behavior of one-dimensional ZnO nanorods grown on ZnO-coated glass substrates via a wet-chemical route at low temperature of 70 1C was investigated. The morphology, structure, composition and chemical state of the prepared nanostructures were characterized by SEM, AFM, XRD and XPS measurements, respectively. The ZnO 1D nanostructures were found to have a hexagonal crystalline structure and grown along the [0 0 1] direction. The nanorods were about 1 mm in length and lower than 100 nm in diameter. The changes in photoresponse of the ZnO nanorods were investigated under different powers of UV illumination and it was also shown that the nanorods have a high sensitivity to UV light. The study suggested that the photoresponse originated from bulk and surface related processes. It is believed that the synthesized ZnO nanorods can be potentially useful in the designing of 1D ZnO-based optoelectronic devices.
Photoelectrochemical properties of ZnO nanorods decorated with Cu and Cu2O nanoparticles
Superlattices and Microstructures, 2014
Please cite this article as: S. Lakehal, S. Achour, Photoelectrochemical properties of ZnO nanorods decorated with Cu and Cu 2 O nanoparticles, Superlattices and Microstructures (2014), doi: http://dx.Abstract Cu 2 O and Cu nanoparticles (NPs) on ZnO nanorods (NRs) were fabricated by two-step process using efficient hydrothermal technique to deposit ZnO nanorods and microwave-irradiation method under ambient conditions to prepare Cu and Cu 2 O NPs dispersed in Diethyleneglycole. The structure and the morphology of these films were studied by X-ray diffraction (XRD), Transmission Electron Microscopy (TEM), Atomic Force Microscopy (AFM), Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray (EDX). The optical property was investigated by UV-Vis absorption spectroscopy and Cathodoluminescence (CL) techniques. Cu 2 O NPs/ZnO NRs heterojunction were produced by depositing Cu&Cu 2 O NPs on as-prepared ZnO NRs using spin-coating method. By changing the drying temperature the Cu metal reduce to Cu 2 O. In these kinds of heterojunctions, an n-type ZnO layer acts both as a host that chemically binds to the p-type Cu 2 O which could help in efficient elecctron-hole separation. The number of Cu 2 O NPs loaded onto the n-type ZnO layer increases the sensitivity in the visible region. The prepared heterojunctions show improved photocurrent with respect to bare ZnO NRs.
Journal of Nanomaterials, 2014
We have successfully synthesized Fe-doped ZnO nanorods by a new and simple method in which the adopted approach is by using ammonia as a continuous source ofOH-for hydrolysis instead of hexamethylenetetramine (HMT). The energy dispersive X-ray (EDX) spectra revealed that the Fe peaks were presented in the grown Fe-doped ZnO nanorods samples and the X-ray photoelectron spectroscopy (XPS) results suggested that Fe3+is incorporated into the ZnO lattice. Structural characterization indicated that the Fe-doped ZnO nanorods grow along thec-axis with a hexagonal wurtzite structure and have single crystalline nature without any secondary phases or clusters of FeO or Fe3O4observed in the samples. The Fe-doped ZnO nanorods showed room temperature (300 K) ferromagnetic magnetization versus field (M-H) hysteresis and the magnetization increases from 2.5 μemu to 9.1 μemu for Zn0.99Fe0.01O and Zn0.95Fe0.05O, respectively. Moreover, the fabricated Au/Fe-doped ZnO Schottky diode based UV photodetec...
Study of ZnO nanorods grown under UV irradiation
Applied Surface Science, 2019
ZnO nanorods (NRs) perpendicularly oriented to the fused silica substrates were directly grown under hydrothermal conditions at 90 ºC with or without UV irradiation. The different morphological structures were visualized and analyzed by scanning electron microscopy (SEM). The crystalline configuration and the structural quality of the ZnO NRs were investigated by Xray diffraction and Raman spectroscopy. The surface properties of ZnO NRs were examined by X-ray photoelectron spectroscopy. Photoluminescence and photothermal deflection spectroscopy techniques were employed to investigate the optical and photoelectrical characteristics of the synthesized ZnO NRs, as well as the changes induced by the absorbance of UV irradiation. Electron paramagnetic resonance spectroscopy was applied to investigate the electron spin state and the structural defects in the given structures. The results from the SEM analysis showed a significant increase in the length of the ZnO NRs grown under UV irradiation, as well as the improvement in their uniformity. An enhancement of the optical and opto-electrical quality of the UV irradiated samples was also observed.
Synthesis of Cu Doped ZnO Nanostructures for Ultra Violet Sensing
2015
This paper mainly focused on the synthesis of zinc oxide nanostructures, their characterization and their ultra violet light sensing response at room temperature. Nanowires, nanobelts and nanosheets were synthesized by varying doping material copper by using vapor transport technique governed by the vapor-liquid- solid or vapor-solid mechanisms. The structural, morphological and optical characterization was carried out using X-ray diffraction, scanning electron microscopy, energy dispersive X-Ray and ultra violet visible spectroscopy techniques. Finally the ultra violet light sensing response of these nanostructures was observed by using Keithley meter. The high ultra violet photosensitivity and fast response time justifies the effective utilization of these ZnO nanostructures as ultra violet sensors in different areas. Copyright © 2015 IFSA Publishing, S. L.
Structural and optical properties of Cu-doped ZnO nanorods by silar method
Materials Technology, 2017
Pure ZnO and Cu-doped ZnO thin films were prepared by successive ionic layer adsorption and reaction method with a Copper concentration of 0•05 and 0•1 mol%. The X-ray diffraction pattern confirmed that the films were polycrystalline in nature with a hexagonal wurtzite structure. The Scanning Electron Microscopy revealed a rod-like shaped grains and the compositional analysis confirmed the presence of Zn, O and Cu in the films. Atomic Force Microscopy and Ultra violet spectroscopy revealed that the surface roughness and band gap values of the films decreases with the increase of copper concentration. The presence of functional groups and chemical bonding was confirmed by infra spectra. Photo luminescence spectra showed that the intensity of the UV emission increases and green emission decreases with the increase of copper concentrations which confirmed the substitution of Cu into the ZnO lattice.