Issue 6, 2013
From the journal:

New Journal of Chemistry

Photo-induced electron transfer in a pyrenylcarbazole containing polymer–multiwalled carbon nanotube composite†

Lihong Yu,‡a   Kin Cheung Lo,‡a   Jingyu Xi,b   David Lee Phillips*a  and  Wai Kin Chan*a  

* Corresponding authors

a Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China
E-mail: phillips@hku.hk, waichan@hku.hk

b Laboratory of Advanced Power Sources and Key Laboratory of Thermal Management Engineering and Materials, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China

Abstract

A polymer incorporated with a pyrenylcarbazole pendant poly(12-(3-(pyren-1-yl)-carbazol-9-yl)dodecyl methacrylate, denoted as PCP) was synthesized and applied in the functionalization of multi-walled carbon nanotubes (MWCNTs) by noncovalent π–π interaction. The PCP–MWCNT hybrids were isolated and characterized by SEM, TEM, and UV-visible absorption and emission spectroscopies. The strong interaction between PCP and the MWCNT in a 1,1,2,2-tetrachloroethane (TCE) solution was studied. It demonstrated an effective quenching effect on emission from PCP by the MWCNTs. DFT calculations showed electron delocalization between the pyrene and carbazole moieties. The LUMO of PCP is mainly located on the pyrene moiety while the LUMO + 1 is predominantly positioned on the carbazole moiety. Femtosecond transient absorption (TA) experiments determined the characteristic TA peaks of the excited states, which have contributions from both the pyrene and carbazole moieties. The excited state lifetime of the polymer PCP was measured to be 659 ps and the photo-excited electrons were injected into the MWCNTs very effectively on a time scale of 420 fs.

Graphical abstract: Photo-induced electron transfer in a pyrenylcarbazole containing polymer–multiwalled carbon nanotube composite

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Article information

DOI
https://doi.org/10.1039/C3NJ41086B
Article type
Paper
Submitted
27 Nov 2012
Accepted
30 Apr 2013
First published
13 May 2013

New J. Chem., 2013,37, 1833-1842

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Photo-induced electron transfer in a pyrenylcarbazole containing polymer–multiwalled carbon nanotube composite

L. Yu, K. C. Lo, J. Xi, D. L. Phillips and W. K. Chan, New J. Chem., 2013, 37, 1833 DOI: 10.1039/C3NJ41086B

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