Raman properties of silicon nanoparticles

Meier, Cedrik; Lüttjohann, Stephan; Kravets, V. G.; Nienhaus, Hermann; Lorke, Axel; Wiggers, Hartmut

doi:10.1016/j.physe.2005.12.030

Cited by 141 publications

(99 citation statements)

References 9 publications

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“…The spectrum of Si 2p 3/2 showed that two peaks can be attributed to the Si0 shows a clear difference among those samples, the intensity of the band decreases with the increase of AC content, and an obvious blue shift can be observed. The differences are ascribed to the transverse optical mode, maybe result from a phonon confinement effect and/or a masking effect [36]; those indicate that the silicon nanoparticles are wrapped by amorphous SiO x and AC. This structure is very favorable to lithium storage, which can supply sufficient conductivity and strong elasticity to withstand the deformation stresses [45].…”

Section: Resultsmentioning

confidence: 99%

“…The composites proposed here has similar structure as the seeds (Si nanoparticles) in the pulp ( Si into a robust and flexible one that can accommodate the mechanical strains induced by the volume changes [36], but also can effectively buffer the volume expansion and enhance the conductivity of Si, thus preventing the degradation of the electrode integrity [15,21,22]. Combining carbon with an appropriate amount of Si can eventually ensure higher capacity and stable performance over long cycling.…”

Section: Resultsmentioning

confidence: 99%

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Nanocomposites of silicon and carbon derived from coal tar pitch: Cheap anode materials for lithium-ion batteries with long cycle life and enhanced capacity

Wang

Chou

Kim

et al. 2013

Electrochimica Acta

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Dou, S. Xue. (2013). Nanocomposites of silicon and carbon derived from coal tar pitch: Cheap anode materials for lithium-ion batteries with long cycle life and enhanced capacity. Electrochimica Acta, 93 (March), 213-221.Nanocomposites of silicon and carbon derived from coal tar pitch: Cheap anode materials for lithium-ion batteries with long cycle life and enhanced capacity AbstractFrom energy and environmental consideration, an industrial waste product, coal tar pitch (CTP), is used as the carbon source for Si/AC composite. We exploited a facile sintering method to largely scale up Si/ amorphous carbon nanocomposite. The composites with 20 wt.% silicon with PVdF binder exhibited stable lithium storage ability for prolonged cycling. The composite anode delivered a capacity of 400.3 mAh g−1 with a high capacity retention of 71.3% after 1000 cycles. Various methods are used to investigate the reason for the outstanding cyclability. The results indicate that the silicon nanoparticles are wrapped by amorphous SiOx and AC in Si/AC composite. This uniform structure is very favorable to lithium storage, the SiOx and AC layers can supply sufficient conductivity and strong elasticity to suppress the stress resulting from the reaction of Si with Li during charge/discharge process.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Nanocomposites of silicon and carbon derived from coal tar pitch: Cheap anode materials for lithium-ion batteries with long cycle life and enhanced capacity

Wang

Chou

Kim

et al. 2013

Electrochimica Acta

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“…15 Calculations of Meier et al 15 have shown that the measured Raman frequencies are lower than those predicted by the phonon confinement model. Their calculations, however, used the dispersion relations of bulk silicon and did not include any changes of the VDOS in the nanoparticles.…”

Section: Discussionmentioning

confidence: 98%

Vibrational density of states of silicon nanoparticles

Meyer

Comtesse

2011

Phys. Rev. B

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The vibrational density of states of silicon nanoparticles in the range from 2.3 to 10.3 nm is studied with the help of molecular-dynamics simulations. From these simulations the vibrational density of states and frequencies of bulklike vibrational modes at high-symmetry points of the Brillouin zone have been derived. The results show an increase of the density of states at low frequencies and a transfer of modes from the high-frequency end of the spectrum to the intermediate range. At the same time the peak of transverse optical modes is shifted to higher frequencies. These observations are in line with previous simulation studies of metallic nanoparticles and they provide an explanation for a previously observed discrepancy between experimental and theoretical data

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“…[20][21][22] As shown in 4, the Raman band generated in the scratch process has a shape close to symmetric one, but the Raman band with slightly asymmetric shape was observed at less number of positions (curve (iii)). These results indicate that most of the Si particles generated in the scratch process is larger than 10 nm.…”

Section: Formation Of Si Nano Particlesmentioning

confidence: 99%

Raman characterization of damaged layers of 4H-SiC induced by scratching

et al. 2016

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Recent development of device fabrication of SiC is awaiting detailed study of the machining of the surfaces. We scratched 4H-SiC surfaces with a sliding microindenter made of a SiC chip, and characterized machining affected layers by micro-Raman spectroscopy. The results of the Raman measurement of the scratching grooves revealed that there were residual stress, defects, and stacking faults. Furthermore, with heavy scratching load, we found clusters of amorphous SiC, Si, amorphous carbon, and graphite in the scratching grooves. Analysis of the Raman spectra showed that SiC amorphization occurs first and surface graphitization (carbonization) is subsequently generated through the phase transformation of SiC. We expect that the Raman characterization of machined surfaces provides information on the machining mechanism for compound semiconductors.

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Raman properties of silicon nanoparticles

Cited by 141 publications

References 9 publications

Nanocomposites of silicon and carbon derived from coal tar pitch: Cheap anode materials for lithium-ion batteries with long cycle life and enhanced capacity

Nanocomposites of silicon and carbon derived from coal tar pitch: Cheap anode materials for lithium-ion batteries with long cycle life and enhanced capacity

Vibrational density of states of silicon nanoparticles

Raman characterization of damaged layers of 4H-SiC induced by scratching

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