Fermi Level Engineering of Single-Walled Carbon Nanotubes by AuCl3 Doping

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• 作者：Ki Kang Kim ; Jung Jun Bae ; Hyeon Ki Park ; Soo Min Kim ; Hong-Zhang Geng ; Kyung Ah Park ; Hyeon-Jin Shin ; Seon-Mi Yoon ; Anass Benayad ; Jae-Young Choi ; Young Hee Lee
• 刊名：Journal of the American Chemical Society
• 出版年：2008
• 出版时间：September 24, 2008
• 年：2008
• 卷：130
• 期：38
• 页码：12757-12761
• 全文大小：315K
• 年卷期：v.130,no.38(September 24, 2008)
• ISSN：1520-5126

文摘

We investigated the modulation of optical properties of single-walled carbon nanotubes (SWCNTs) by AuCl₃ doping. The van Hove singularity transitions (E₁₁^S, E₂₂^S, E₁₁^M) in absorption spectroscopy disappeared gradually with an increasing doping concentration and a new peak appeared at a high doping concentration. The work function was downshifted up to 0.42 eV by a strong charge transfer from the SWCNTs to AuCl₃ by a high level of p-doping. We propose that this large work function shift forces the Fermi level of the SWCNTs to be located deep in the valence band, i.e., highly degenerate, creating empty van Hove singularity states, and hence the work function shift invokes a new asymmetric transition in the absorption spectroscopy from a deeper level to newly generated empty states.