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- W2314333244 abstract "Here, we present the results on the investigation of structural and vibrational properties of CuxS (x = 1–2) nanocrystals formed using the Langmuir–Blodgett technique. The synthesis requires deposition of high quality Langmuir–Blodgett films of copper behenates on a solid substrate (Si, Au, and Pt). The Langmuir–Blodgett film is then sulfidized, what results in the formation of the copper sulfide nanocrystals embedded in behenic acid matrix. Finally, free-standing CuxS nanocrystals are obtained after temperature annealing at 120–400 °C in an Ar atmosphere. Morphology (size, shape, and areal density) and the crystal structure of nanocrystals were determined by direct structural methods including scanning and transmission electron microscopies and high-energy electron diffraction. Surface-enhanced Raman scattering (SERS) by optical phonons in CuxS nanocrystals in the vicinity of metal nanoclusters provided a significant enhancement factor (about 25) and allowed the fine structure of their phonon spectrum to be observed. SERS spectra of CuxS nanocrystals under annealing reveal the high frequency shift of optical phonon modes from 475 to 492 cm–1, which is explained by the existence of minor copper-deficient crystal phases. The combination of surface-enhanced Raman scattering spectroscopy, electron diffraction, and electron transmission microscopy allowed us to establish at least three stable phases: CuS, Cu1.8S, and Cu2S." @default.
- W2314333244 created "2016-06-24" @default.
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- W2314333244 date "2014-09-29" @default.
- W2314333244 modified "2023-10-09" @default.
- W2314333244 title "Synthesis and Characterization of Cu<sub><i>x</i></sub>S (<i>x</i> = 1–2) Nanocrystals Formed by the Langmuir–Blodgett Technique" @default.
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- W2314333244 doi "https://doi.org/10.1021/jp507355t" @default.
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