In-situ Raman monitoring of stress evaluation and reaction in Cu2O oxide layer

Zheng, Yao-Ting; Xuan, Fu‐Zhen; Wang, Zhengdong

doi:10.1016/j.matlet.2012.03.015

Cited by 14 publications

(5 citation statements)

References 25 publications

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“…Two distinct physical phenomena might be related: the first process could be related to the degradation of the polycrystalline structure of CuSCN forming (CuSCN) x aggregates while the second process could involve the decomposition of these aggregates into amorphous carbon. Interestingly, copper oxide is detected under air atmosphere as the annealing temperature of 300 °C is reached, as shown by the Raman lines at 220 and 636 cm –1 . , The oxidation of the CuSCN layer thus begins around the annealing temperature of 300 °C. Interestingly, the [Cu]/[S] ratio as determined by EDX measurements starts increasing from the annealing temperatures of 250 and 300 °C under air and nitrogen atmosphere, respectively, and is marked by a reduction of the sulfur content (Supporting Information, Table S1).…”

Section: Resultsmentioning

confidence: 93%

“…However, a copper oxide (Cu 2 O) crystalline phase is formed at the highest annealing temperature of 300 °C under air atmosphere, as shown by the occurrence of lines at 220 and 636 cm −1 (Figure 3b) that are related to the two major lines of Cu 2 O. 60,61 Nevertheless, no Raman lines related to copper sulfide occur in the spectrum at 472 and 474 cm −1 , for v(Cu 2 S) and v(CuS), respectively. 62 At lower annealing temperature, the residual solvent signature is still observed in the CuSCN layer.…”

Section: Structural and Chemicalmentioning

confidence: 99%

“…Interestingly, copper oxide is detected under air atmosphere as the annealing temperature of 300 °C is reached, as shown by the Raman lines at 220 and 636 cm −1 . 60,61 The oxidation of the CuSCN layer thus begins around the annealing temperature of 300 °C. Interestingly, the [Cu]/[S] ratio as determined by EDX measurements starts increasing from the annealing temperatures of 250 and 300 °C under air and nitrogen atmosphere, respectively, and is marked by a reduction of the sulfur content (Supporting Information, Table S1).…”

Section: Structural and Chemicalmentioning

confidence: 99%

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Physical Properties of Annealed ZnO Nanowire/CuSCN Heterojunctions for Self-Powered UV Photodetectors

Garnier

Parize

Appert

et al. 2015

ACS Appl. Mater. Interfaces

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The low-cost fabrication of ZnO nanowire/CuSCN heterojunctions is demonstrated by combining chemical bath deposition with impregnation techniques. The ZnO nanowire arrays are completely filled by the CuSCN layer from their bottoms to their tops. The CuSCN layer is formed of columnar grains that are strongly oriented along the [003] direction owing to the polymeric form of the β-rhombohedral crystalline phase. Importantly, an annealing step is found essential in a fairly narrow range of low temperatures, not only for outgassing the solvent from the CuSCN layer, but also for reducing the density of interfacial defects. The resulting electrical properties of annealed ZnO nanowire/CuSCN heterojunctions are strongly improved: a maximum rectification ratio of 2644 at ±2 V is achieved following annealing at 150 °C under air atmosphere, which is related to a strong decrease in the reverse current density. Interestingly, the corresponding self-powered UV photodetectors exhibit a responsivity of 0.02 A/W at zero bias and at 370 nm with a UV-to-visible (370-500 nm) rejection ratio of 100 under an irradiance of 100 mW/cm(2). The UV selectivity at 370 nm can also be readily modulated by tuning the length of ZnO nanowires. Eventually, a significant photovoltaic effect is revealed for this type of heterojunctions, leading to an open circuit voltage of 37 mV and a short circuit current density of 51 μA/cm(2), which may be useful for the self-powering of the complete device. These findings show the underlying physical mechanisms at work in ZnO nanowire/CuSCN heterojunctions and reveal their high potential as self-powered UV photodetectors.

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Section: Resultsmentioning

confidence: 93%

Section: Structural and Chemicalmentioning

confidence: 99%

Section: Structural and Chemicalmentioning

confidence: 99%

See 1 more Smart Citation

Physical Properties of Annealed ZnO Nanowire/CuSCN Heterojunctions for Self-Powered UV Photodetectors

Garnier

Parize

Appert

et al. 2015

ACS Appl. Mater. Interfaces

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“…Such Cu nanoclusters in water can be further extracted with a nonpolar solvent of n -decane. Owing to the absence of Cu–Cl and Cu–O signals , in Raman spectra (Figure S10), the Cu nanoclusters after water washing and further n -decane extraction are confirmed to be ligand free. The pale gold upper extract (Figure S11) shows distinct absorption bands centered at 268, 291, and 430 nm without the copper plasmonic band at ∼560 nm .…”

Section: Resultsmentioning

confidence: 99%

Macroscopic Synthesis of Ligand-Free Subnanometer Metal Clusters via Molten Salt

et al. 2023

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Macroscopic synthesis of bare metal nanoclusters is a prerequisite for their practical applications from laboratory to industry. Herein, we reported an unexpected high dissolution of copper in molten LiCl–KCl eutectic salt. Combining synchrotron-based spectroscopy, nuclear magnetic resonance, and scanning transmission electron microscopy measurements, the dissolved copper was demonstrated to form nanoclusters with a few atoms in the molten salt, which can be frozen to maintain their pristine states for more than one year. The theoretical analysis indicated that the salt ions formed a protective solvation shell to hold the stability of nanoclusters. By washing the one-pot solidified salt with water, the macroscale of ligand-free subnanometer copper clusters is obtained. With this method, the preparation of metal nanoclusters can be further scaled up at low cost to speed up the fundamental research and industrial applications.

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“…Signal from copper metal is not expected to appear in these spectra since it is Raman inactive in the range of measurement as Gong et al demonstrated [28]. All the spectra exhibit Cu 2 O characteristic bands located at 148, 218, 315, 405 and 622 cm -1 for the most intense ones [29][30][31]. Peaks located at 521 and 689 cm -1 can be assigned to Fe 3 O 4 or Cu x Fe 3-x O 4 with low copper content [32].…”

Section: Thin Film Characterizationsmentioning

confidence: 95%

Copper and iron based thin film nanocomposites prepared by radio frequency sputtering. Part I: elaboration and characterization of metal/oxide thin film nanocomposites using controlled in situ reduction process

et al. 2013

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Copper and iron based thin films were prepared on glass substrate by radio-frequency sputtering technique from a delafossite CuFeO 2 target. After deposition, the structure and microstructure of the films were examined using grazing incidence X-ray diffraction, Raman spectroscopy, electron probe micro-analysis and transmission electron microscopy coupled with EDS mapping. Target to substrate distance and sputtering gas pressure were varied to obtain films having different amount and distribution of copper nanoparticles and different composition of oxide matrix. The overall reaction process, which starts from CuFeO 2 target and ends with the formation of films having different proportion of copper, copper oxide and iron oxide, was described by a combination of balanced chemical reactions. A direct relationship between the composition of the metal/oxide nanocomposite thin film and the sputtering parameters was established. This empirical relationship can further be used to control the composition of the metal/oxide nanocomposite thin films, i.e. the in situ reduction of copper ions in the target.

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In-situ Raman monitoring of stress evaluation and reaction in Cu2O oxide layer

Cited by 14 publications

References 25 publications

Physical Properties of Annealed ZnO Nanowire/CuSCN Heterojunctions for Self-Powered UV Photodetectors

Physical Properties of Annealed ZnO Nanowire/CuSCN Heterojunctions for Self-Powered UV Photodetectors

Macroscopic Synthesis of Ligand-Free Subnanometer Metal Clusters via Molten Salt

Copper and iron based thin film nanocomposites prepared by radio frequency sputtering. Part I: elaboration and characterization of metal/oxide thin film nanocomposites using controlled in situ reduction process

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