Selective Electrochemical Etching of Single‐Walled Carbon Nanotubes

Abstract

Single‐walled carbon nanotubes (SWNTs) are a promising material for future nanotechnology. However, their applications are still limited in success because of the co‐existence of metallic SWNTs and semiconducting SWNTs produced samples. Here, electrochemical etching, which shows both diameter and electrical selectivity, is demonstrated to remove SWNTs. With the aid of a back‐gate electric field, selective removal of metallic SWNTs is realized, resulting in high‐performance SWNT field‐effect transistors with pure semiconducting SWNT channels. Moreover, electrochemical etching is realized on a selective area. These findings would be valuable for research and the application of SWNTs in electrochemistry and in electronic devices.

Mouldable all-carbon integrated circuits

“…For further improvement, metallic CNTs incorporated in the channel should be eliminated so that the density of CNTs is able to be increased without degrading ON/OFF ratio. Selective etching of metallic CNTs based on chemical 36 , electrochemical 37 , plasma 38 and light irradiation 39 methods would be applicable for present devices.…”

Carbon Nanotube Mass Production: Principles and Processes

“…[179,180] A series of surfactants/polymers have been used to separate SWCNTs with fixed chirality. [181] Novel SO 3 etching [182] and electrochemical etching [183] methods were also developed to obtain metallic or semiconducting CNTs. On the other hand, in situ growth methods are also good ways to obtain CNTs with certain chiralities.…”

Linear Aliphatic Dialkynes as Alternative Linkers for Double‐Click Stapling of p53‐Derived Peptides

“…The oxygenation reactions of multi‐ and single‐walled carbon nanotubes (MWCNTs and SWCNTs) have been well‐studied 6. 7, 9, 11–18 The oxygenation reactions of MWCNTs have been investigated from the viewpoint of their purification and activation for electrochemical applications by using controlled‐potential electrolysis methods in alkaline, neutral, and acidic solutions 6. 7, 11–13 Indeed, the oxygenation reactions of SWCNTs have also been investigated in solutions at various pH values by using electrochemical methods 9.…”

“…7, 11–13 Indeed, the oxygenation reactions of SWCNTs have also been investigated in solutions at various pH values by using electrochemical methods 9. 16 It has been reported that the kinetics of the oxygenation reactions of SWCNTs would depend on their diameter and several research groups have reported diameter‐selective etching and selective oxygenation reactions 18–23. Wei et al.…”