title: [Raman spectrum of nano-graphite synthesized by explosive detonation].
abstract: The nano-graphite powder synthesized by the detonation of explosives with negative oxygen balance is a new powder material with potential applications. In this work, the preparation of nano-graphite powder in steel chamber by pure TNT (trinitrotoluene) explosives has been introduced. In the synthesis process, the protective gases in the steel chamber are N2, CO2 and Ar, and the pressure is 0.25-2 atm. Raman spectrum of the nano-graphite was measured. The characteristic Raman band assigned to sp2 of graphite has been observed at about 1 585 cm(-1) with half-peak width of 22 cm(-1). The peak shifted to a higher frequency by 5 cm(-1) compared with that of bulk graphite. The authors explain this blue shift phenomenon by size effect. The average size of nanographite from Raman measurement is 2.97-3.97 nm. X-ray diffraction (XRD) and transmission electron microscopy (TEM) were used to measure the structure and particle size of the nano-graphite. The crystallite size of nano-graphite estimated from XRD andTEM are 2.58 nm (acid untreated) and 1.86 nm (acid treated) respectively, which is in accord with the results of the measurement approximately.
authors.affiliation: State Key Laboratory Mechanical Behavior for Materials, Xi'an Jiaotong University, Xi'an 710049, China.
authors.forename: Chao
authors.initials: C
authors.lastname: Wen
authors.forename: Xun
authors.initials: X
authors.lastname: Li
authors.forename: De-Yu
authors.initials: DY
authors.lastname: Sun
authors.forename: Jin-Qing
authors.initials: JQ
authors.lastname: Guan
authors.forename: Xiao-Xin
authors.initials: XX
authors.lastname: Liu
authors.forename: Ying-Rui
authors.initials: YR
authors.lastname: Lin
authors.forename: Shi-Ying
authors.initials: SY
authors.lastname: Tang
authors.forename: Gang
authors.initials: G
authors.lastname: Zhou
authors.forename: Jun-De
authors.initials: JD
authors.lastname: Lin
authors.forename: Zhi-Hao
authors.initials: ZH
authors.lastname: Jin
mesh_terms: D001128:Argon / Q000737:chemistry; D002245:Carbon Dioxide / Q000737:chemistry; D003460:Crystallization; D053834:Explosive Agents / Q000737:chemistry*; D006108:Graphite / Q000138:chemical synthesis / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D049329:Nanostructures / Q000737:chemistry; D009584:Nitrogen / Q000737:chemistry; D010316:Particle Size; D011208:Powders; D013059:Spectrum Analysis, Raman; D014303:Trinitrotoluene / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D053834:Explosive Agents; D011208:Powders; D014303:Trinitrotoluene; D002245:Carbon Dioxide; D001128:Argon; D006108:Graphite; D009584:Nitrogen