Investigation on the Structural Changes of Cupric Oxide (CuO) Nanostructures by Thermal Oxidation Process

Sahdan, Mohd Zainizan; Ariffin, Nor Diana Mohd; Sarip, Nurulnadia; Tawil, Siti Nooraya Mohd

doi:10.4028/www.scientific.net/amr.832.471

Cited by 3 publications

(3 citation statements)

References 11 publications

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“…The average crystalline grain size D of CuO NSs was estimated analyzing the diffraction peaks from XRD data using Debye–Scherer’s formula: , D = K λ/β cos θ, where λ is the X-ray wavelength (1.54060 Å), K is the Scherrer constant (0.9), β is the full width at half-maximum of the diffraction peak (in rad), and θ is the Bragg diffraction angle. Average grain size values were calculated to be 21.6 and 17.5 nm for the CuO(002) and (111) crystal planes, respectively.…”

Section: Results and Discussionmentioning

confidence: 99%

Optical and Photoconductive Response of CuO Nanostructures Grown by a Simple Hot-Water Treatment Method

et al. 2018

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In this work, we report the fabrication and characterization of copper(II) oxide (CuO) nanoleaf structures (NS) grown on Cu sheets by a facile hot-water treatment (HWT) method without using catalyst materials. In addition, simple photoconductive devices based on asprepared CuO nanoleaves were fabricated to study the optical and photocurrent response of CuO NSs. Scanning electron microscopy images revealed the formation of uniform and dense nanoleaves morphology of CuO on Cu sheets. X-ray diffractometer patterns indicated that synthesized nanostructures have a monoclinic CuO structure. Furthermore, X-ray photoelectron spectroscopy results demonstrate the formation of the Cu−O chemical bond which confirmed the formation of the CuO phase. For the fabrication of the photoconductive devices, the CuO/Cu samples were coated with an aluminum-doped ZnO (AZO) shell by sputter deposition at room temperature. CuO NSs show high-broadband ultraviolet/visible spectroscopy (UV/vis) absorbance with marked enhancement after AZO coating. Current density−voltage (J−V) measurements show that AZO/CuO/Cu devices exhibit a photocurrent density response of 9.65 ± 0.43 μA/cm 2 with a rise time of 0.195 s and decay time of 0.192 s. They also indicate a Schottky contact between p-type CuO NSs and the Cu substrate. Photocurrent increases and rise time and decay time decrease with an applied forward bias (e.g. ∼19.00 μA/cm 2 at 1.0 V with a rise time of ∼0.100 s and decay time of 0.096 s). Optical band gap of CuO NSs was calculated to be 1.44 ± 0.13 eV, by the analysis of Tauc's plot. These results indicate that our photoconductive devices based on CuO NSs prepared by HWT can achieve high light absorption and good photocurrent response for optoelectronic applications.

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Section: Results and Discussionmentioning

confidence: 99%

Optical and Photoconductive Response of CuO Nanostructures Grown by a Simple Hot-Water Treatment Method

et al. 2018

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“…During thermal oxidation of bulk Cu, Cu 2 O is first formed first followed by CuO formation after a sufficiently long oxidation time [22,34]. Growth mechanism for the CuO film formation can be summarized as follows [35]:…”

Section: Growth Of Cuo Nanostructures and Thin Filmmentioning

confidence: 99%

“…The mean crystalline grain size D of the CuO TF and NLs can be obtained from the XRD profiles using the Debye-Scherrer's formula [9,35]…”

Section: Morphological Analysismentioning

confidence: 99%

CuO/Cu core/shell nanostructured photoconductive devices by hot water treatment and high pressure sputtering techniques

et al. 2019

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This work demonstrates the fabrication of simple photoconductive devices based on CuO/Cu core/shell nanostructured heterojunction that performs notable photocurrent response. Copper oxide (CuO) nanoleaf structures (NLs) have been successfully grown on ITO-coated glass substrate via a simple hot water treatment (HWT) method. A conformal Cu shell was fabricated by high pressure sputtered (HIPS) deposition technique on the CuO nanoleaves to produce NLs-core/metal shell photoconductive devices. For comparison, CuO thin film (TF) was prepared by the thermal oxidation method to manufacture the conventional planar thin film devices. Results showed that the HWT method resulted in the formation of dense 3D CuO nanoleaves on ITO/glass substrate with a high surface area. CuO NLs showed higher optical absorption than CuO TF in the ultraviolet and visible spectrum. Further, the optical band gaps of CuO NLs and TF samples have been estimated from Touc’s plot to be 1.45 ± 0.10 eV and 1.63 ± 0.20 eV, respectively. Current density–voltage measurements’ result revealed that core/shell devices have superior photocurrent response compared to TF devices. The average photocurrent density at zero-bias for the NLs devices was 23.5 ± 2.0 μA cm−2 and for TF devices was 6.7 ± 1.0 μA cm−2. Besides, NLs core/shell photoconductive devices exhibit a remarkable increase in photocurrent response values with increasing bias voltage compared to the increased values in TF devices. The results demonstrate that the devices based on HWT-NLs-core/HIPS-shell design showed a significant enhancement on the photoconductivity response compared with the conventional TF design. The performance enhancement can be attributed to improving light trapping, photocarriers generation-recombination times and carrier collection by introducing an alternative radial interface in core/shell design. Also, HWT CuO NLs geometry feature with the high surface area has worked to enhance light absorption that enables the design of high efficiency, functional and commercial photoconductive detectors.

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Examination the properties of doped copper oxide by silver: prepared chemical method

Umran

Majeed

sultan

2019

J. Phys.: Conf. Ser.

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Investigation on the Structural Changes of Cupric Oxide (CuO) Nanostructures by Thermal Oxidation Process

Cited by 3 publications

References 11 publications

Optical and Photoconductive Response of CuO Nanostructures Grown by a Simple Hot-Water Treatment Method

Optical and Photoconductive Response of CuO Nanostructures Grown by a Simple Hot-Water Treatment Method

CuO/Cu core/shell nanostructured photoconductive devices by hot water treatment and high pressure sputtering techniques

Examination the properties of doped copper oxide by silver: prepared chemical method

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