Radial deformation of single-walled carbon nanotubes on quartz substrates and the resultant anomalous diameter-dependent reaction selectivity
作者机构：Beijing National Laboratory for Molecular Sciences Key Laboratory for the Physics and Chemistry of Nanodevices State KeyLaboratory of Rare Earth Materials Chemistry and Applications College of Chemistry and Molecular Engineering Peking UniversityBeijing 100871 China
出 版 物：《Nano Research》 (纳米研究（英文版）)
年 卷 期：2015年第8卷第9期
页 面：3054-3065页
核心收录：
学科分类：07[理学]
基 金：Beijing Higher Education Young Elite Teacher Project for financial support 国家自然科学基金 国家科技部项目
主 题：single-walled carbonnanotubes,reaction selectivity,interaction,quartz substrate,radial deformation
摘 要：Owing to the unique conjugated structure, the chemical-reaction selectivity of single-walled carbon nanotubes （SWNTs） has attracted great attention. By utilizing the radial deformation of SWNTs caused by the strong interactions with the quartz lattice, we achieve an anomalous diameter-dependent reaction selectivity of quartz lattice-oriented SWNTs in treatment with iodine vapor; this is distinctly different from the widely reported and well accepted higher reaction activity in small-diameter tubes compared to large-diameter tubes. The radial deformation of SWNTs on quartz substrate is verified by detailed Raman spectroscopy and mappings in both G-band and radial breathing mode. Due to the strong interaction between SWNTs and the quartz lattice, large-diameter tubes present a larger degree of radial deformation and more delocalized partial electrons are distributed at certain sidewall sites with high local curvature. It is thus easier for the carbon--carbon bonds at these high-curvature sites on large-diameter tubes to break down during reaction. This anomalous reaction activity offers a novel approach for selective removal of small-band^aD large-diameter tubes.
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