Evaluating the electric property of different crystal faces and enhancing the Raman scattering of Cu2O microcrystal by depositing Ag on the surface

Gao, Hong; Zhang, Junying; Li, Min; Liu, Kejia; Guo, Dong; Zhang, Yue

doi:10.1016/j.cap.2013.01.049

Cited by 36 publications

(10 citation statements)

References 28 publications

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“…Figure c,d shows that the characteristic peaks of Cu 2 O can be observed in both the film and patterned structure. The peaks at 109, 154, and 218 cm –1 correspond to the phonon mode Γ 12 – , phonon mode Γ 15 (1) , and second-order overtone 2 Γ 12 – motion of Cu 2 O, respectively. − In addition, the characteristic peaks of Cu 2 O can be observed in the spectra of the bottom (the blue spectrum) and top (the red spectrum) of a single line of the Cu 2 O patterned structure (Figure d inset), which can also be observed in the cross-sectional SEM image of the Cu 2 O patterned structure (Figure S3b). In addition, the space between the Cu layer of the sample substrate and the contact region of the PDMS line stamp is much smaller than the spacing of the mold (the trenches in the PDMS line stamp).…”

Section: Resultsmentioning

confidence: 93%

Effect of Wavelength-Scale Cu₂O Particles on the Performance of Photocathodes for Solar Water Splitting

et al. 2019

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Grain particle size-controlled Cu 2 O structures were fabricated by oxidizing copper microfilms by soaking them in a 4 M NaOH solution. A microfilm of Cu 2 O was obtained from one-step heating (80 °C for 1 h) of a multilayered film of Cu/Au/Ti (1000/50/10 nm) on a glass substrate followed by naturally cooling under ambient conditions. On the other hand, molding by a micro contact stamp during fabrication of the Cu 2 O structure was carried out to obtain Cu 2 O structures with a relatively smaller particle size than that of the Cu 2 O microfilm, which was obtained by confinement of the Cu 2 O crystal growth within the molded space of the micro contact stamp. The Cu 2 O phases in the microfilm and the molded Cu 2 O samples were confirmed with X-ray diffraction, micro-Raman spectroscopy, and diffuse reflectance spectroscopy. The light absorption capabilities of the Cu 2 O samples were characterized by finite-difference time-domain simulations; the wavelength-scale particle size resulted in absorbance enhancement near the Cu 2 O band gap, and the mirror effect of the Au film underneath the Cu 2 O samples strengthened the absorbance over the entire monitored wavelength region. Moreover, photoelectrochemical characterization proved that the photocurrent of the wavelength-scale Cu 2 O particles (obtained with the molding procedure) increased by approximately 2−5 times in the cathodic process, and the onset potential decreased by approximately 0.3 eV compared to that of the Cu 2 O microfilm. The enhanced light absorption and relatively large surface area, due to the wavelength-scale particle size of Cu 2 O in the molded sample, would result in an enhancement of the photocatalytic activity of Cu 2 O materials.

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Section: Resultsmentioning

confidence: 93%

Effect of Wavelength-Scale Cu₂O Particles on the Performance of Photocathodes for Solar Water Splitting

et al. 2019

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“…After MoO 3 was loaded on graphene, all the peaks of MoO 3 and graphene appeared on the Raman spectra of MoO 3 -GNS, and further analysis can be found, that the I D / I G value (2.56) of MoO 3 -GNS is increased as compared to GO due to the decrease in the ordered graphitic structure after the loading of MoO 3 . In the spectra of Cu 2 O, the peak at about 626 cm –1 corresponds to the Cu–O stretching mode . The Raman spectrum of Cu 2 O-GNS shows characteristic peaks of graphene along with typical peaks of Cu 2 O detected at 626 cm –1 .…”

Section: Resultsmentioning

confidence: 97%

Effect of Molybdenum Trioxide-Loaded Graphene and Cuprous Oxide-Loaded Graphene on Flame Retardancy and Smoke Suppression of Polyurethane Elastomer

Liu

Zhang

et al. 2016

Ind. Eng. Chem. Res.

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Molybdenum trioxide (MoO3)-loaded graphene (MoO3-GNS) hybrids and cuprous oxide (Cu2O)-loaded graphene (Cu2O-GNS) hybrids were successfully prepared via the hydrothermal method and one-pot coprecipitation method, respectively. Subsequently, the MoO3-GNS and Cu2O-GNS hybrids were incorporated into a polyurethane elastomer (PUE) matrix, respectively, and their effects on thermal stability, flame retardancy, and smoke suppression properties of PUE were investigated. Thermogravimetric analysis results showed that the incorporation of 2.0 wt % MoO3-GNS or Cu2O-GNS hybrids efficiently improved the char yield of the PUE matrix. Moreover, the addition of MoO3-GNS or Cu2O-GNS hybrids presented excellent flame retardancy and smoke suppression properties of PUE composites, as evidenced by the obvious reduction in their heat release rate, total heat release, and smoke density. The improvement in the flame retardancy and smoke suppression properties were mainly attributed to the synergistic effect between the physical barrier effect of graphene sheets and the catalytic charring effect of MoO3 or Cu2O.

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“…Light has been used to promote the growth of metal nanostructures, − and the proposed mechanism is that light can photogenerate holes and electrons, which will accelerate the redox reaction. The reactions have been proposed as follows …”

Section: Results and Discussionmentioning

confidence: 99%

Electroless Deposition of Silver Nanostructures by Redox Reaction of Copper Oxide

2017

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We synthesized Cu2O microcrystal by solution phase reduction and drop-casted it on various substrates as reductant. Different structures of Ag, including nanowires, fold lines, dendrites, and so on, were obtained by immersing the Cu2O substrates into different concentrations of AgNO3. The products were characterized by XRD, SEM, TEM, and so on, and their morphology is proposed to be determined by the interplay between tiny Cu2O nanoparticles and the distribution of Ag+ concentration affected by Mullins–Sekerka instabilities. Using an optical microscope, we directly observed the real-time growth process of Ag nanowire and found its growth speed to be fluctuating around 5 μm/min. We also investigated the effects exerted on the formation of Ag nanostructures by other parameters, including crystal morphology of Cu2O, heating, light irradiation, and stirring the precursor. From the experiment results, we deduced that the {111} facet of Cu2O played a larger part than {100} facet in promoting the growth of Ag nanostructures, and increase in the reaction or diffusion rate can enhance the Ag nanostructure growth.

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Evaluating the electric property of different crystal faces and enhancing the Raman scattering of Cu2O microcrystal by depositing Ag on the surface

Cited by 36 publications

References 28 publications

Effect of Wavelength-Scale Cu₂O Particles on the Performance of Photocathodes for Solar Water Splitting

Effect of Wavelength-Scale Cu₂O Particles on the Performance of Photocathodes for Solar Water Splitting

Effect of Molybdenum Trioxide-Loaded Graphene and Cuprous Oxide-Loaded Graphene on Flame Retardancy and Smoke Suppression of Polyurethane Elastomer

Electroless Deposition of Silver Nanostructures by Redox Reaction of Copper Oxide

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Evaluating the electric property of different crystal faces and enhancing the Raman scattering of Cu2O microcrystal by depositing Ag on the surface

Cited by 36 publications

References 28 publications

Effect of Wavelength-Scale Cu2O Particles on the Performance of Photocathodes for Solar Water Splitting

Effect of Wavelength-Scale Cu2O Particles on the Performance of Photocathodes for Solar Water Splitting

Effect of Molybdenum Trioxide-Loaded Graphene and Cuprous Oxide-Loaded Graphene on Flame Retardancy and Smoke Suppression of Polyurethane Elastomer

Electroless Deposition of Silver Nanostructures by Redox Reaction of Copper Oxide

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Effect of Wavelength-Scale Cu₂O Particles on the Performance of Photocathodes for Solar Water Splitting

Effect of Wavelength-Scale Cu₂O Particles on the Performance of Photocathodes for Solar Water Splitting