羧甲基化壳聚糖非共价修饰的碳纳米管：一种可控的供体-受体纳米杂化物。

Noncovalently modified carbon nanotubes with carboxymethylated chitosan: a controllable donor-acceptor nanohybrid.

作者信息

Long Dewu, Wu Guozhong, Zhu Guanglai

机构信息

Department of Nuclear Analysis, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800 China.

出版信息

Int J Mol Sci. 2008 Feb;9(2):120-130. doi: 10.3390/ijms9020120. Epub 2008 Feb 5.

DOI:10.3390/ijms9020120

PMID:19325737

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC2635665/

Abstract

We report here the modification of multiwalled carbon nanotubes (MWNTs) with a kind of polysaccharide, carboxymethylated chitosan (cmCs), and their potential usage as donor-acceptor nanohybrids. The modified composites (cmCs/MWNTs) were characterized by high-resolution TEM, FT-IR, TGA and time-resolved spectroscopy. The time-resolved spectroscopic experiments revealed that interfacial electron transfer readily takes place between MWNTs and surface immobilized cmCs chains. The forward electron transfer is fast (< 20 ns) while the backward recombination is slow. The recombination process strongly depends on the chain length of carboxylmethylated chitosan, i.e. a shorter recombination lifetime (~~1.1 micros) for the shorter-chain cmCs coated MWNTs against that of the longer-chain cmCs coated MWNTs (~~3.5 micros). The results demonstrated that the cmCs/MWNTs composite may be applied as a controllable donor-acceptor nanohybrid.

摘要

我们在此报告了用一种多糖——羧甲基化壳聚糖（cmCs）对多壁碳纳米管（MWNTs）进行改性，以及它们作为供体 - 受体纳米杂化物的潜在用途。通过高分辨率透射电子显微镜、傅里叶变换红外光谱、热重分析和时间分辨光谱对改性复合材料（cmCs/MWNTs）进行了表征。时间分辨光谱实验表明，MWNTs与表面固定的cmCs链之间很容易发生界面电子转移。正向电子转移很快（<20纳秒），而反向复合则很慢。复合过程强烈依赖于羧甲基化壳聚糖的链长，即较短链cmCs包覆的MWNTs的复合寿命较短（约1.1微秒），而较长链cmCs包覆的MWNTs的复合寿命较长（约3.5微秒）。结果表明，cmCs/MWNTs复合材料可作为一种可控的供体 - 受体纳米杂化物。