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(拉曼)Covalently porphyrin-functionalized single-walled carbon nanotubes

来源:8miu百度云文档 编辑:小木木 时间:2018-06-19 11:15

Covalently porphyrin-functionalized single-walled carbon nanotubes:a novel photoactive and optical limiting donor–acceptor nanohybrid {

Zhen Guo,a Feng Du,b Dongmei Ren,a Yongsheng Chen,*b Jianyu Zheng,*a Zhibo Liu c and Jianguo Tian c Received 16th February 2006,Accepted 25th May 2006

First published as an Advance Article on the web 13th June 2006

DOI:10.1039/b602349e

Novel covalently porphyrin-functionalized single-walled carbon nanotubes (SWNTs)have been

synthesized by the reaction of SWNTs with in situ generated porphyrin diazonium compounds.

The resulting nanohybrid was characterized by spectroscopic (UV-Vis-NIR,FTIR and Raman)

and microscopic (TEM and AFM)methods.The Raman and absorption spectroscopy data

showed that the electronic properties of the modified tubes were mostly retained,without

damaging their one-dimensional electronic properties.The fluorescence from the porphyrin

moiety was almost completely quenched by SWNTs,indicating that the unique direct linkage

mode facilitated the effective energy and electron transfer between the excited porphyrin moiety

and the extended p -system of SWNTs.This novel nanohybrid material also exhibited excellent

optical limiting properties.

Introduction Single-walled carbon nanotubes (SWNTs)have attracted much attention since they were discovered by Ijima in 1993.1Due to the rigid rod-like structure and highly delocalized,extended p -electron systems of SWNTs,these one-dimensional nanowires have many unique mechanical and electronic properties.2Porphyrins are stable natural functional dyes with a large extinction coefficient in the visible light region,predictable rigid structures,and prospective photochemical electron-transfer ability,and have been widely studied for various photo-harvesting and photoelectronic devices.3Since

Nakashima and co-workers reported the first porphyrin–

nanotube nanocomposite formed due to van der Waals forces,4

several non-covalent systems have been investigated for

SWNT–porphyrin hybrid materials in the last two years for

various molecular photoelectronic applications;these have

been constructed using p –p and van der Waals interactions,4–6

polymer wrapping 7and electrostatic interactions.8However,

studies of the covalent incorporation of light-harvesting por-

phyrin chromophores with the extended p -system of SWNTs

have been limited.Recently,Ya-Ping Sun et al.and Durairaj

Baskaran et al.have reported porphyrin-functionalized

SWNTs bound covalently with an ester linkage,9in which SWNTs bearing carboxylic groups on the sidewall and at the terminal were esterified with hydroxyl porphyrins.In this article,we report the synthesis and characterization of a novel covalently porphyrin-functionalized SWNT nanohybrid (SWNTs–TPP,Schemes 1and 2)constructed with a unique a State Key Laboratory and Institute of Elemento-Organic Chemistry,

Nankai University,Tianjin 300071,China.

E-mail:jyzheng@/doc/f6c8c05c910ef12d2af9e7e8.html ;Fax:+86(22)-2350-5572;

Tel:+86(22)-2350-5572b Center for Nanoscale Science and Technology and Key Laboratory for

Functional Polymer Materials,Institute of Polymer Chemistry,College

of Chemistry,Nankai University,Tianjin 300071,China.

E-mail:yschen99@/doc/f6c8c05c910ef12d2af9e7e8.html ;Fax:+86(22)-2350-0693;

Tel:+86(22)-2350-0693c The Key Laboratory of Advanced Technique and Fabrication for Weak-

Light Nonlinear Photonics Materials,Ministry of Education and TEDA

Applied Physical School,Nankai University,Tianjin 300457,China

{Electronic supplementary information (ESI)available:FTIR spectra

of SWNTs–TPP,Raman and UV-Vis-NIR spectra of control

experiments,fluorescence spectra of TPP and SWNTs–TPP,and the

absorbance changes of the porphyrin moiety after adding HCl.See

DOI:

(拉曼)Covalently porphyrin-functionalized single-walled carbon nanotubes

10.1039/b602349e Scheme 1Preparation of SWNTs–TPP.

PAPER /doc/f6c8c05c910ef12d2af9e7e8.html /materials |Journal of Materials Chemistry This journal is ?The Royal Society of Chemistry 2006J.Mater.Chem.,2006,16,3021–3030|3021D o w n l o a d e d o n 17 M a y 2011

P u b l i s h e d o n 13 J u n e 2006 o n h t t p ://p u b s .r s c .o r g | d o i :10.1039/B 602349E View Online

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