文献类型：期刊文献

英文题名：Preparation and Optical Limiting Properties of Multiwalled Carbon Nanotubes with π-Conjugated Metal-Free Phthalocyanine Moieties

作者：He, Nan[1];Chen, Yu[1];Bai, Jinrui[1];Wang, Jun[2,3];Blau, Werner J.[2,3];Zhu, Jinhui[1]

机构：[1]E China Univ Sci & Technol, Dept Chem, Key Lab Adv Mat, Shanghai 200237, Peoples R China;[2]Univ Dublin Trinity Coll, Sch Phys, Dublin 2, Ireland;[3]Univ Dublin Trinity Coll, CRANN, Dublin 2, Ireland

年份：2009

卷号：113

期号：30

起止页码：13029

外文期刊名：JOURNAL OF PHYSICAL CHEMISTRY C

收录：;EI(收录号：20093312254970);WOS:【SCI-EXPANDED(收录号:WOS:000268233800020)】；

基金：We are grateful for the financial support of National Natural Science Foundation of China (20676034, 20876046), New Century Excellent Talents in University (NCET-050413), Ministry of Education of China (309013), and Shanghai Municipal Educational Commission for the Shuguang fellowship (08GG10) and Shanghai Eastern Schlorship, respectively. J.W. thanks the Science Foundation Ireland (SFI) for his postdoctoral research fellowship. This work was partially supported by the SFI under Grant No. 08/CE/11432.

语种：英文

外文关键词：Nonlinear optics - Photoluminescence spectroscopy - Yarn - Fluorescence quenching - Microcomputers - Optical properties

摘要：Phthalocyanines (Pcs) usually exhibit stronger optical limiting response that can be used to protect human eyes, optical elements, and sensors from intense laser pulses. New unsymmetrically substituted metal-free phthalocyanine-covalently functionalized multiwalled carbon nanotubes (PcH2-MWNTs), in which the wt % of MWNTs in the resulting product was found to be 35%, were synthesized. A considerably quenching of the fluorescence intensity was found in the photoluminescence spectrum of PcH2-MWNTs. This observation suggests a quenching of the singlet excited PcH2 by the covalently linked MWNTs. This material exhibits strong scattering at higher intensities, which evidently comes from the MWNT counterpart. The nonlinear response of tBu(3)NH(2)PcH(2) is due to reverse saturable absorption (RSA), while that of PcH2-MWNTs is due to both RSA and nonlinear scattering, which could be two conflicted mechanisms for optical limiting, giving rise to suppression of the whole nonlinear response of PcH2-MWNTs.