Selective Oxidation on Metallic Carbon Nanotubes by Halogen Oxoanions

Abstract

Chlorine oxoanions with the chlorine atom at different oxidation states were introduced in an attempt to systematically tailor the electronic structures of single-walled carbon nanotubes (SWCNTs). The degree of selective oxidation was controlled systematically by the different oxidation state of the chlorine oxoanion. Selective suppression of the metallic SWCNTs with a minimal effect on the semiconducting SWCNTs was observed at a high oxidation state. The adsorption behavior and charge transfer at a low oxidation state were in contrast to that observed at a high oxidation state. Density functional calculations demonstrated the chemisorption of chloro oxoanions at the low oxidation state and their physisorption at high oxidation states. These results concurred with the experimental observations from X-ray photoelectron spectroscopy. The sheet resistance of the SWCNT film decreased significantly at high oxidation states, which was explained in terms of a p-doping phenomenon that is controlled by the oxidation state.

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A Comprehensive Review on Separation Methods and Techniques for Single-Walled Carbon Nanotubes

“…Most of the selective reactions for SWNT separation [123,167] are classified into the following three types of chemical and physical processes; selective oxidation in the presence of H 2 O 2 [168,169,170,171,172], OsO 4 [173], H 2 SO 4 /HNO 3 [174,175,176,177], HNO 3 [178], ozone [179,180], AuCl 4 – [181], NaClO x [182] and air (high temperature) [183,184] for M/S, diameter and ( n , m ) selections, selective reaction with nitronium ion [185,186], NO 2 [187], carbene [188,189], diazonium salt [58,109,190,191,192,193,194,195,196,197,198,199,200,201,202], fluorine [203], triethylsilane [204], fluorinated olefin [205], SO 3 [206], RLi and RMgX [207], and azomethine ylide [208] for M/S separation, selective break-down of either metallic or semiconducting SWNTs by use of electricity [209,210,211], plasma [212,213], laser [214,215], microwave [174,216,217] and Xe-lamp [218], and electrochemica...…”

Aligned, Ultralong Single‐Walled Carbon Nanotubes: From Synthesis, Sorting, to Electronic Devices

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