Interaction of fullerene with single-crystal silicon
TL;DR: In this paper, the optical properties of layers of C60 fullerene on a silicon substrate are studied before and after a reducing annealing at 900-1050°C in a hydrogen atmosphere in order to detect the formation of silicon-carbide clusters.
Abstract: The optical properties of layers of C60 fullerene on a silicon substrate are studied before and after a reducing annealing at 900–1050°;C in a hydrogen atmosphere in order to detect the formation of silicon-carbide clusters. It is shown, on the basis of Raman scattering, infrared absorption, time-resolved photoluminescence spectra, and ellipsometric measurements, that the SiC clusters are not detected at the accuracy of the methods used. After annealing, the layer is in the form of a porous hydrogen-rich film of disordered graphite, possibly with a small amount of fullerene molecules.
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TL;DR: In this article, the authors evaluate transformation kinetics of derivatized fullerene species by simulating natural aquatic processes, which will help elucidate biological effects of water-stirred nano-C60 (aqu-nC60).
Abstract: The present study was carried out to evaluate transformation kinetics of derivatized fullerene species by simulating natural aquatic processes, which will help elucidate biological effects of water-stirred nano-C60 (aqu-nC60). Physicochemical analyses of aqu-nC60 included molecular and agglomerate-scale characterization, surface charge analysis through examination of electrophoretic mobility, and chemical composition analysis using spectroscopy. Detailed analysis of aqu-nC60 transformation over a 28-day stirring period in both light and dark conditions indicated aqu-nC60 agglomerate concentrations can be estimated as a time-function using a predictor model (R
2 > 0.99). Number-weighted agglomerate size did not differ significantly over the 28-day stirring period regardless of photocondition, although size distributions were more uniform as stirring time increased. The total number of surface groups identified through XPS indicated increased derivatization as a function of time with additions assigned to mono-oxygenated carbon moieties while the number of di-oxygenated moieties declined. Earlier-phase stirring (t ≤ 14 days) products were shown to contain epoxide surface groups, which were absent in later-phase (t > 14 days) suspensions, suggesting specific pathways to derivatization with preferential mono-oxygenated states. Filter residue, a by-product of the aqu-nC60 synthesis process, demonstrated high hydrophobicity and FTIR spectra similar to underivatized material, suggesting synthesis process inefficiencies.
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Cites background from "Interaction of fullerene with singl..."
...1993); C–O bond in C60 (Hou and Jafvert 2009b) o Amorphous carbon structure in C60 (Sreseli et al. 2005) p Hemiketal in C60(OH)n (Krishna et al....
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References
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Book•
01 Jan 1977
TL;DR: In this article, the polarization of light waves and propagation of polarized light through polarizing optical systems are discussed. But the authors focus on the application of ellipsometry in the field of measurement in ellipsometer systems.
Abstract: Preface. 1. The polarization of light waves. 2. Propagation of polarized light through polarizing optical systems. 3. Theory and analysis of measurements in ellipsometer systems. 4. Reflection and transmission of polarized light by stratified planar structures. 5. Instrumentation and techniques of ellipsometry. 6. Applications of ellipsometry. Appendix. Author index. Subject index.
4,634 citations
"Interaction of fullerene with singl..." refers result in this paper
...We solved the direct ellipsometry problem; i.e., we calculated the ellipsometry angles Ψ and Δ at the specified variable parameters of the layer ( n , k , d ) and determined the values at which the results of the calculation were in best agreement with experimental values of Ψ and Δ [ 8 ]....
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TL;DR: The discovery of fullerenes in 1985 opened a completely new field of materials research as mentioned in this paper, and the discovery of single-wall carbon nanotubes (SWCNTs) discovered later, these curved carbon networks are a...
Abstract: The discovery of fullerenes in 1985 opened a completely new field of materials research. Together with the singlewall carbon nanotubes (SWCNTs) discovered later, these curved carbon networks are a ...
146 citations
Book•
01 Jan 2000
TL;DR: Theoretical studies of photoexcitations in fullerenes ultrafast dynamics of electronic and vibrational excitations in superconductivity properties of fullerene and related materials have been carried out as mentioned in this paper, including the electronic third-order nonlinear optical properties of C60 and C70 films optical limiting and excited-state absorption.
Abstract: Theoretical studies of photoexcitations in fullerenes ultrafast dynamics of electronic and vibrational excitations in fullerenes photoexcited state and electron transfer properties of fullerenes and related materials optical studies of fullerene triplet states the electronic third order nonlinear optical properties of C60 and C70 films optical limiting and excited-state absorption in fullerene solutions and doped glasses magnetic resonance studies of photoexcited fullerenes electrons and phonons in fullerenes and carbon nanotubes photoconductivity in fullerene thin films and solids optical and electronic properties of polymeric fullerenes electronic properties of fullerene/pi-conjugated polymer composites.
123 citations
TL;DR: In this article, a review of the application of Raman microscopy to the characterisation of silicon carbide monofilaments produced by CVD (chemical vapour deposition) is presented.
Abstract: This paper reviews recent research upon the application of Raman microscopy to the characterisation of silicon carbide monofilaments produced by CVD (chemical vapour deposition). It is demonstrated that Raman microscopy is an invaluable technique allowing qualitative information about stoichoimetry variation in silicon carbide monofilaments to be obtained, as it readily detects both crystalline and amorphous carbon and silicon. It is shown that it is possible to characterise the morphology of the SiC crystallites in the monofilaments from analysis of the Raman line shapes. It is also demonstrated that Raman spectroscopy can be used to follow deformation of SiC monofilaments and to determine residual stresses in SiC-monofilament-reinforced metal-matrix composites. In addition, it is shown that it is possible to evaluate internal stresses in the carbon coatings of SiC monofilaments.
81 citations
TL;DR: In this paper, the photoluminescence (PL) spectra show an asymmetrical broadband, which can be Gaussian divided into two bands at 380 (3.26 eV) and 454 (2.73 eV).
Abstract: C60 molecules were chemically coupled in the pores of porous Si through a coupling agent and then coated with a layer of Si, and followed by N2 annealing. X-ray diffraction results indicate that the fabricated samples contain β-SiC particles which may exist in the pores, in addition to Si, SiO2, and graphite. The photoluminescence (PL) spectra show an asymmetrical broadband, which can be Gaussian divided into two bands at 380 (3.26 eV) and 454 (2.73 eV) nm. Spectral analyses and the experimental results from infrared spectroscopy and PL excitation measurements suggest that the 380 nm PL band is related to oxygen-vacancy defects in the SiO2 matrix, whereas the blue PL band is closely connected with the β-SiC particles. Our experiments provide a way for fabricating stable blue-emitting β-SiC materials.
57 citations