Annealing Effects on the Properties of Copper Oxide Thin Films Prepared by Chemical Deposition

Johan, Mohd Rafie; Suan, Mohd Shahadan Mohd; Hawari, Nor Liza; Ching, Hsiao‐Wei

doi:10.1016/s1452-3981(23)19665-9

Cited by 236 publications

(13 citation statements)

References 16 publications

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“…These optical band gap values of NLs and TF are within the expected range for CuO [23,24,29,63,67]. The lower band gap of CuO nanoleaves may indicate enhanced oxidation and may be due to higher absorption involving defect states [68] compared to conventional CuO TF. However, the absorbance spectrum of CuO nanoleaves exhibits higher absorption in the visible spectrum, which indicated the appearance of a considerable number of defects levels in CuO bandgap [69].…”

Section: Optical Characterizationsupporting

confidence: 64%

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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Section: Optical Characterizationsupporting

confidence: 64%

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

et al. 2019

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“…The face cubic central FCC crystallinity structure of metallic Copper and Copper oxide was related with (111), (200), (220), and (311), indicating that the synthesized CuNPs are composed of mixed copper and copper oxide nanoparticles. It is interesting to notice that the peaks at 36.75 and 61.35 are typical for Cu 2 O and that both peaks were attributable to the exitance of a Cu 2 O shell surrounding the copper core, as Biçer and Şişman ( 2010 ) ; Johan et al ( 2011 ); Mohamed ( 2020 ) discovered.…”

Section: Discussionmentioning

confidence: 94%

Copper nanoparticles biosynthesis by Stevia rebaudiana extract: biocompatibility and antimicrobial application

Abdelhai,

Shabaan,

Kamal

et al. 2024

AMB Expr

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The growth of material science and technology places a high importance on the creation of better processes for the synthesis of copper nanoparticles. So that, an easy, ecological, and benign process for producing copper nanoparticles (CuNPs) has been developed using candy leaf (Stevia rebaudiana) leaves aqueous extract for the first time. UV-visible spectroscopy, dynamic light scattering (DLS), X-ray diffraction (XRD), high-resolution transmission electron microscope (HR-TEM), Fourier transmission infrared (FTIR), and zeta potential were applied to demonstrate strong characterization for the biosynthesized stevia-CuNPs. The UV-visible absorbance at 575 nm of surface plasmon resonance (SPR) was 1.2. The particle size mean diameter was recorded as 362.3 nm with − 10.8 mV zeta potential. The HR-TEM scanning revealed 51.46–53.17 nm and spherical-shaped stevia-CuNPs surrounded by coat-shell proteins. The cytotoxicity and cytocompatibility activity assay revealed that stevia-CuNPs was safe in lower concentrations and had a significant cell viability reduction in higher concentrations. The produced stevia-CuNPs were applied as antimicrobial agents against eight pathogenic bacteria and five fungi strains. The inhibitory action of the stevia-CuNPs was more pronounced in bacteria than in fungi, and they likewise demonstrated further inhibition zones in Staphylococcus aureus (50.0 mm) than in Aspergillus flavus (55.0 mm). With inhibition zone sizes of 50.0 mm and 47.0 mm and 50 µg/ml minimum inhibitory concentration, S. aureus and A. flavus were the most inhibited pathogens. The minimum lethal effect (MLC) estimate for S. aureus was 50 µg/ml, whereas 75 µg/ml for A. flavus. The stevia-CuNPs mode of action was characterized as bactericidal/fungicidal as the ratio of MIC to MLC was estimated to be equal to or less than 2. After all, stevia-CuNPs could be used as an alternative to commercial antibiotics to solve the problem of multidrug-resistant (MDR) microorganisms.

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“…XRD patterns in Figure 1C tell that the diffraction peak of GDY at 22°corresponds to the (002) crystal plane of amorphous carbon materials, and the strong (020), (201), and (440) diffraction peaks of GDYÀ Cu 2 + are evident for Cu 2 + . In addition, the XRD pattern of GDYÀ Cu 2 + appears a new diffraction peak at 61.3°that corresponds to the (220) plane of Cu + , [19] indicating that Cu 2 + undergoes a reduction reaction during the chelation process with GDY. These findings demonstrate that GDY has a good reduction ability to reduce Cu 2 + to Cu + .…”

Section: Resultsmentioning

confidence: 99%

Graphdiyne: A Chelating Carbon for High Selectivity Direct Electrochemical Sensing of Trace Copper Ions

Shi

Liu

et al. 2022

ChemElectroChem

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Graphdiyne (GDY), an emerging type of carbon allotropes with unique sp−sp2 carbon atoms, is firstly explored for high selectivity direct electrochemical sensing of ultra‐trace level copper ions (Cu2+). It achieves a wide detection range of 0.25–380 μM and a trace level as low as 8 nM, among the best performance of reported carbon‐based sensors. It is found that GDY with unique C≡C possesses both chelating and reducing abilities to efficiently anchor and reduce Cu2+ to Cu+, eventually leading to ultrasensitive detection.

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Annealing Effects on the Properties of Copper Oxide Thin Films Prepared by Chemical Deposition

Cited by 236 publications

References 16 publications

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

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

Copper nanoparticles biosynthesis by Stevia rebaudiana extract: biocompatibility and antimicrobial application

Graphdiyne: A Chelating Carbon for High Selectivity Direct Electrochemical Sensing of Trace Copper Ions

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