文献类型：期刊文献

英文题名：Covalent Modification of Graphene Oxide with Carbazole Groups for Laser Protection

作者：Bai, Ting[1];Li, Cong-Qi[1];Sun, Jie[4,5];Song, Yi[1];Wang, Jun[3];Blau, Werner J.[4];Zhang, Bin[2];Chen, Yu[1]

机构：[1]E China Univ Sci & Technol, Inst Appl Chem, Key Lab Adv Mat, Shanghai 200237, Peoples R China;[2]Natl Univ Singapore, Dept Chem & Biomol Engn, Singapore 119260, Singapore;[3]Chinese Acad Sci, Shanghai Inst Opt & Fine Mech, Key Lab Mat High Power Laser, Shanghai 201800, Peoples R China;[4]China Acad Engn Phys, Inst Chem Mat, Mianyang 621900, Sichuan, Peoples R China;[5]Univ Dublin Trinity Coll, Ctr Res Adapt Nanostruct & Nanodevices, Sch Phys, Dublin 2, Ireland

年份：2015

卷号：21

期号：12

起止页码：4622

外文期刊名：CHEMISTRY-A EUROPEAN JOURNAL

收录：;EI(收录号：20151000610968);WOS:【SCI-EXPANDED(收录号:WOS:000350760000023)】；

基金：Y.C. is grateful for the financial support of the National Natural Science Foundation of China (61378072), Joint project of Ministry of Education and State Administration of Foreign Experts Affairs (TS2010HDLG024), and the Shanghai Leading Talent Program. J.W. thanks the financial supports from the National 10000-Talent Program, CAS 100-Talent Program, the National Natural Science Foundation of China (61178007), and Science and Technology Commission of Shanghai Municipality (11nm0502400, 12J1409400). W.J.B. gratefully acknowledges a visiting professorship for international scientists from China National Foreign Experts Program and Science Foundation Ireland (12/IA/1306).

语种：英文

外文关键词：carbazole; graphene; laser protection; materials science; nonlinear optics

摘要：In the past decades, significant effort has been invested into the research and development of optical limiting materials and processes in order to develop practical solutions for the protection from laser beams. In this study, a new soluble graphene oxide based material (GO-Cz) has been synthesized through the covalent modification of graphene oxide (GO) with a carbazole derivative (Cz). The formation of an amido bond between the Cz group and GO has been confirmed by X-ray photoelectron and Fourier transform infrared spectroscopy. At the same concentration, both the nonlinear extinction coefficient and the imaginary third-order susceptibility were increased by a factor of approximate to 6.93 at 532nm and approximate to 6.07 at 1064nm relative to those of GO, as a result of the covalent grafting of the Cz moieties onto the GO surface. The GO-Cz dispersions exhibit a much better optical limiting performance than GO and GO/Cz blends at both 532 and 1064nm due to the possible intramolecular electron-transfer between the GO and Cz moieties and the effective combination of the different nonlinear optical mechanisms.