Papers by Keyword: Raman Scattering

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Authors: Qiang Xu, Hua Yang Sun, Cheng Chen, Ling Yun Jang, E. Rusli, Suwan P. Mendis, Chin Che Tin, Zhi Ren Qiu, Zheng Yun Wu, Chee Wee Liu, Zhe Chuan Feng
Abstract: Synchrotron radiation X-ray absorption and UV 325 nm excitation Raman scattering- photoluminescence (PL) have been employed to investigate a series of 4H-SiC wafers, including bulk, epitaxial single or multiple layer structures by chemical vapor deposition. Significant results on the atomic bonding and PL-Raman properties are obtained from these comparative studies.
Authors: T. Paskova, E. Valcheva, Ivan G. Ivanov, Rositza Yakimova, Susan Savage, Nils Nordell, Chris I. Harris
Authors: Eiji Kurimoto, Hiroshi Harima, Tadao Toda, Minoru Sawada, Shinichi Nakashima, Motohiro Iwami
Authors: Wei Wen Liu, Tijjani Adam, Azizan Aziz, Siang Piao Chai, Abdul Rahman Mohamed, U. Hashim
Abstract: The effect of calcination temperature for Fe2O3/MgO catalysts on the formation of carbon nanotubes (CNTs) was examined. CNTs were synthesized over Fe2O3/MgO catalysts calcined at different temperatures by catalytic decomposition of methane at 1000°C. The synthesized CNTs were investigated by a combination of scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and Raman spectroscopy. The results show that the effect of calcination temperatures greatly governed the diameter and the quality of the SWCNTs formed. The catalysts calcined at 500, 600 and 700°C produced CNTswith the diameters of 1.53, 1.95 and 2.97nm, respectively. Generally, an increase in the calcination temperature increases the average diameter and decreases the quality of the CNTs produced.
Authors: Galina V. Arysheva, Nina M. Ivanova, Maksim E. Konishchev, Alla A. Pustovalova, Vladimidr S. Sypchenko
Abstract: The results of study of surface morphology and chemical composition of biocompatible titanium oxide and oxynitride coatings deposited by the method of reactive magnetron sputtering are presented in this paper. The distribution of coating’s fragments in size was obtained. Molecular composition of the coatings was obtained by scanning electron microscopy and Raman scattering.
Authors: H.C. Lin, Zhe Chuan Feng, Ming Song Chen, Z.X. Shen, Wei Jie Lu, W.E. Collins
Abstract: The phonon anisotropy property of the GaN wurtzite crystal is studied using angular dependent Raman spectroscopy both theoretically and experimentally. The polarized Raman scattering spectra were recorded from cross-sections of c-axis oriented GaN films as a function of the angle between the incident laser polarization direction and the film normal direction in three different configurations. The Raman intensity of A1(TO) showed a sinusoidal dependence on the rotating angle, as also did the E1(TO) mode, while the E2 mode has a quite different behavior. The theoretical fit takes into account the susceptibility contribution and the phase differential of different vibrating elements.
Authors: Eiji Kurimoto, M. Hangyo, Hiroshi Harima, Kenji Kisoda, Taro Nishiguchi, Shigehiro Nishino, Shinichi Nakashima, Masakazu Katsuno, Noboru Ohtani
Authors: Jian Wei Li, Nan Xu, Jian Li, Zhi Xin Zhang, He Jun Yao
Abstract: laser radar is a kind of modern active optical remote sensing device and is the outcome of the combination of the traditional radar technology and the modern laser technology. It takes laser as the light source and senses remotely the target through the radiation signal generated when the detecting laser and the target interact. This paper summarizes the structure and classification of the laser radar for the purpose of atmosphere composition detection, and also discusses the existing problems and development trends.
Authors: M.D. Efremov, Vladimir A. Volodin, D.V. Marin, Sofia A. Arzhannikova, M.G. Ivanov, S.V. Gorajnov, A.I. Korchagin, V.V. Cherepkov, A.V. Lavrukhin, S.N. Fadeev, R.A. Salimov, S.P. Bardakhanov
Abstract: Silicon nanopowders were produced using electron-beam-induced evaporation of bulk silicon ingots in various gas atmosphere. Optical properties of the nanopowders were studied with the use of photoluminescence and Raman spectroscopy techniques. Photoluminescence peaks in the visible region of the spectrum have been detected at room temperature in silicon nanopowders, produced in argon gas atmosphere. Strong short-wavelength shift of the photoluminescence peaks can be result of quantum confinement effect for electrons and holes in small silicon nanocrystals (down to 2 nm in diameter). The size of silicon nanocrystals was estimated from Raman spectroscopy data. The calculated in frame of effective mass model optical gaps for silicon nanocrystals of spherical shape are in good correlation with experimental photoluminescence data. The attempts of deposition of silicon nanocrystal films from the nanopowders on silicon substrates were carried out.
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