文献类型：期刊文献

英文题名：Influence of laser wavelength on two-dimensional carbon nanosheet formation from laser-induced exfoliation of naphthalene

作者：Qian, Min[1];Niu, Yue Ping[1];Gong, Shang Qing[1]

机构：[1]East China Univ Sci & Technol, Dept Phys, Shanghai 200237, Peoples R China

年份：2018

卷号：428

起止页码：549

外文期刊名：APPLIED SURFACE SCIENCE

收录：;EI(收录号：20174004234778);WOS:【SCI-EXPANDED(收录号:WOS:000415227000069)】；

基金：This work is supported by the Fundamental Research Funds for the Central Universities (Project No. 222201714014 and 222201714017), National Natural Science Foundations of China (11474092), and is sponsored by Shanghai Sailing Program 17YF1403300.

语种：英文

外文关键词：Pulsed laser exfoliation; Nd:YAG laser; Excimer laser; Carbon nanosheets

摘要：Pulsed Nd:YAG (532 nm) and Excimer (248 nm) lasers were employed to produce freestanding, two-dimensional (2D), carbon nanosheets (CNSs) from naphthalene, through laser-induced exfoliation. The polymer-to-carbon transition was investigated in terms of laser wavelengths, fluences, as well as target preparations. Continuous and porous CNSs of several nanometers in thickness and micrometers in size were obtained from 532 and 248 nm pulsed laser exfoliation of spin-coated naphthalene films, respectively. The porous morphology is ascribed to the photon-induced dissociation of chemical bonds dominated in 248 nm laser interaction with ablated naphthalene. With the increase of laser fluences from 1 to 5 J cm(-2), amorphous carbon and ultrathin CNS structures were obtained in sequence. This work revealed a general mechanism of producing 2D structured carbon materials from pulsed laser exfoliation. (C) 2017 Elsevier B.V. All rights reserved.