P2&amp;#x2013;26: Thermodynamic mechanism responsible for growth of CuO nanowires by thermal oxidation

Luo, Yingxin; Xu, Ning

doi:10.1109/ivnc.2010.5563141

Cited by 3 publications

(3 citation statements)

References 8 publications

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“…Temperature was observed with a notable impact on the product. An optimized number of 40 °C for anodization was used throughout this work, given the revealed influence of temperature on all of the solubility, kinetics, and diffusions (refer to Figure S5 for more details, for instance, the black CuO layer formation at a higher temperature). ,− Again, the purity of the Cu foil was explored without notable impact on the PEC efficiency (Figure S6).…”

Section: Resultsmentioning

confidence: 99%

Better Charge Separation in CuO Nanowire Array Photocathodes: Micro-/Nanostructure Regulation for Photoelectrochemical Reaction

Cao

Liu

et al. 2020

ACS Appl. Energy Mater.

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Geometrical optimization of nanowire arrays (NWAs) has been regarded as a straightforward and important route to improve the performance for photoelectrocatalytic systems but has not been realized with copper oxides yet. In this work we successfully performed the control to CuO NWAs via electrochemically prepared Cu(OH) 2 intermediate structures. The arrays consist of uniform nanowires with tunable length from 2 to 10 μm and aspect ratios over 100. Results suggest that the optimization can significantly improve the photocurrents several times, which is mostly due to a quantum efficiency over 57% (455 nm) in the presence of electron scavengers. Notably diverged charge transport and transfer between NWAs were revealed by photoelectrochemical impedance and Mott−Schottky measurements, which suggest the necessity of suitable structure for the better charge separation and collection. Moreover, our protocol can be adapted to prepare Cu 2 O NWAs, which can provide great potential for developing highperformance photocathodes in the future.

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Section: Resultsmentioning

confidence: 99%

Better Charge Separation in CuO Nanowire Array Photocathodes: Micro-/Nanostructure Regulation for Photoelectrochemical Reaction

Cao

Liu

et al. 2020

ACS Appl. Energy Mater.

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“…Since semiconductor nanocrystals featuring intermediate characteristics between discrete molecules and extended crystalline lattices, they usually show extraordinary size and shape-dependent material properties. Among others, CuO nanowires [2] and nanorods are the most extensively studied.…”

Section: Introductionmentioning

confidence: 99%

“…A variety of synthesis strategies have been introduced in thin films fabrication such as spraying [3], chemical conversion [1], spin coating [4], etching [5], electrodeposition [6], thermal evaporation [7], reactive magnetron sputtering [8], laser ablation [9], thermal oxidation [10] and chemical vapor deposition [2].…”

Section: Introductionmentioning

confidence: 99%

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

Sahdan

Ariffin

Sarip

et al. 2013

AMR

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A simple and cost effective method using a thermal oxidation process for synthesizing cupric oxide (CuO) nanostructures is demonstrated in this paper. Using elevated temperatures ranging from 100°C to 400°C, the optimum formation of CuO composition indicated by an X-ray diffraction (XRD) was obtained at 400°C. Then, the effects of gas flow rates (ranging from 1 to 10 kPa) on the formation of CuO nanorods were investigated using a field emission scanning electron microscope (FESEM). It was found that at higher gas flow rate, the formation of CuO nanorods was obviously observed. The current-voltage (I-V) characteristic obtained from an I-V measurement system shows that diode characteristic has been formed with threshold voltage (Vth) of 0.9 V and breakdown voltage (VB) of-5 V. The mechanism of structural changes will be discussed in details.

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Intriguingly high thermal conductivity increment for CuO nanowires contained nanofluids with low viscosity

Zhu

Wang

et al. 2018

Sci Rep

134

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Nanofluids offer the exciting new possibilities to enhance heat transfer performance. In this paper, experimental and theoretical investigations have been conducted to determine the effect of CuO nanowires on the thermal conductivity and viscosity of dimethicone based nanofluids. The CuO nanowires were prepared through a thermal oxidation method, and the analysis indicated that the as-prepared CuO nanowires had high purity, monocrystalline with a monoclinic structure and large aspect ratio compared to CuO nanospheres. The experimental data show that the thermal conductivity of the nanofluids increases with the volume fraction of CuO nanowires or nanospheres, with a nearly linear relationship. For the nanofluid with the addition of 0.75 vol.% CuO nanowires, the thermal conductivity enhancement is up to 60.78%, which is much higher than that with spherical CuO nanoparticles. The nanofluids exhibit typical Newtonian behavior, and the measured viscosity of CuO nanowires contained nanofluids were found only 6.41% increment at the volume fraction of 0.75%. It is attractive in enhanced heat transfer for application. The thermal conductivity and viscosity of CuO nanofluids were further calculated and discussed by comparing our experimental results with the classic theoretical models. The mechanisms of thermal conductivity and viscosity about nanofluids were also discussed in detail.

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P2–26: Thermodynamic mechanism responsible for growth of CuO nanowires by thermal oxidation

Cited by 3 publications

References 8 publications

Better Charge Separation in CuO Nanowire Array Photocathodes: Micro-/Nanostructure Regulation for Photoelectrochemical Reaction

Better Charge Separation in CuO Nanowire Array Photocathodes: Micro-/Nanostructure Regulation for Photoelectrochemical Reaction

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

Intriguingly high thermal conductivity increment for CuO nanowires contained nanofluids with low viscosity

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