Redox properties of a single (7,5)single-walled carbon nanotube determined by in situ photoluminescence spectroelectrochemical method
Redox properties of a single (7,5)single-walled carbon nanotube determined by in situ photoluminescence spectroelectrochemical method
复制标题
原位光致发光光谱电化学法测定单个(7,5)单壁碳纳米管的氧化还原性能
DOI：
10.1039/c4nr03945a
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发表时间：
2014
期刊：
影响因子：
6.7
通讯作者：
N. Nakashima
中科院分区：
文献类型：
--
作者：
L. Hong;S. Mouri;Y. Miyauchi;K. Matsuda;N. Nakashima
单壁碳纳米管（SWNTs）电子态的确定一直是碳纳米管科学和纳米技术的核心问题。在这里，我们描述了一个单一的单壁碳纳米管的氧化和还原电位确定原位光致发光（PL）光谱电化学测量。通过光致发光成像和单壁碳纳米管光致发光光谱的研究，发现单壁碳纳米管的光致发光随外加电位的增加而逐步猝灭。基于使用Nernst方程对所获得的电位依赖性PL图的分析，成功地确定（7，5）管的氧化和还原电位分别为0.41 V和−0.38 V vs. Ag/AgCl，其从本体（7，5）SWNT的氧化和还原电位偏移。我们进一步观察到PL蓝移和线宽变窄的外部施加到单壁碳纳米管的电位增加。这些结果对于理解单根（n，m）单壁碳纳米管的电子性质及其应用具有重要意义。
The determination of electronic states of single-walled carbon nanotubes (SWNTs) has been a central issue in science and nanotechnology of carbon nanotubes. We here describe the oxidation and reduction potentials of a single SWNT determined by in situ photoluminescence (PL) spectroelectrochemical measurements. By PL imaging and single SWNT PL spectroscopy, the stepwise quenching behavior of the PL from a single (7,5)SWNT was detected as the outer-applied potentials increased. Based on the analysis of the obtained potential-dependent PL plots using the Nernst equation, the oxidation and reduction potentials of the (7,5) tube are successfully determined as 0.41 V and −0.38 V vs. Ag/AgCl, respectively, which shift from those of the bulk (7,5)SWNTs. We further observed a PL blueshift and narrowing of the line width as the external-applied potential to the single SWNT increases. The present results are important for understanding the electronic properties of a single (n,m)SWNT and its applications.