可溶性高聚物-多壁碳纳米管复合物的吸收光谱和光限幅性能研究

doi:10.3964/j.issn.1000-0593.2008.07.048

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摘要：合成了三种可溶性高聚物嫁接的多壁碳纳米管复合物，包括聚乙烯基咔唑-多壁碳纳米管复合物(MWNTs-PVK)，聚苯乙烯-多壁碳纳米管复合物(MWNTs-PSt)和聚甲基丙烯酸甲酯-多壁碳纳米管复合物(MWNTs-PMMA)。合成样品的TEM图显示出高聚物成功地包裹在碳纳米管外。样品的氯仿溶液UV-Vis 吸收谱显示，复合物的紫外区与纯的多壁碳纳米管不同，有一些复杂的特征吸收峰，反映了高聚物与碳纳米管共价连接的作用。利用Z扫描技术通过527 nm的纳秒激光脉冲激发研究了这三种复合物的非线性光学性质和光限幅性能。这三种复合物的氯仿溶液的光限幅性能很相似，并且优于纯多壁碳纳米管氯仿悬浮液和C60甲苯溶液。为解释观察到的结果，研究了样品的非线性折射，非线性吸收和非线性散射机制。结果显示，非线性吸收是引起样品光限幅的主要机制。

关键词：光限幅;高聚物嫁接的多壁碳纳米管;Z扫描;非线性吸收

Abstract：Three kinds of soluble polymer grafted multi-walled carbon nanotubes (MWNTs), including poly(N-vinylcarbazole)-MWNTs (MWNTs-PVK), polystyrene-MWNTs (MWNTs-PSt) and poly(methyl methacrylate)-MWNTs (MWNTs-PMMA) were synthesized. The TEM images of these samples show that polymers are coated outside the carbon nanotubes. The UV-Vis absorption spectra of the samples in CHCl3 were taken on a HP8452 spectrophotometer at room temperature. Compared with that of MWNTs suspension, there is a characteristic absorption peak in the ultraviolet region, which can be attributed to the polymers linked covalently with MWNTs. Their nonlinear optical properties and optical limiting (OL) performances were investigated by Z-scan method with 527 nm nanosecond laser pulses. These MWNTs dissolved in chloroform possess similar optical limiting properties, which are better than that of raw MWNT suspension and C60 in toluene solution. Nonlinear refraction, nonlinear absorption and nonlinear scattering mechanism were taken into consideration for explaining the observed results. The analysis of the experimental results shows that nonlinear absorption is the dominant mechanism behind the OL performance of these samples.

Key words：Optical limiting;Polymer grafted multi-walled carbon nanotubes;Z-scan;Nonlinear absorption

收稿日期: 2007-03-06 修订日期: 2007-06-16

中图分类号:

O437

通讯作者: 钱士雄 E-mail: saqian@fudan.ac.cn

引用本文:

邱雪琼^{1, 2},吴惠霞³,童睿^{1, 2},钱士雄^1*,林阳辉³,蔡瑞芳³. 可溶性高聚物-多壁碳纳米管复合物的吸收光谱和光限幅性能研究[J]. 光谱学与光谱分析, 2008, 28(07): 1449-1453.
QIU Xue-qiong^1,2,WU Hui-xia³,TONG Rui^1,2,QIAN Shi-xiong^1*,LIN Yang-hui³,CAI Rui-fang³. Study on Absorption Spectra and Optical Limiting Properties of Soluble Polymer/Multi-Walled Carbon Nanotube Composites. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2008, 28(07): 1449-1453.

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