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Analytical Chemistry

Analytical Chemistry

IF: 6.7
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Controlled Chemical Vapor Deposition and Modification of Carbon Layers inside Quartz Nanopipettes

Published:7 December 2024 DOI: 10.1021/acs.analchem.4c03875
Yue Wang, Yingjie Zhao, Yingfei Ma, Dengchao Wang

Abstract

Carbon nanopipettes (CNPs) have attracted much attention in nanoscale electrochemical applications recently, while the carbon structure and surface oxygen-containing groups limit its applications. Herein, we grow the carbon nanotubes (CNTs) inside the quartz nanopipet via the chemical vapor deposition method, and the fabricated carbon nanotube nanopipettes (CNT-NPs) exhibit better electrochemical responses toward biomolecules such as glutathione and ascorbic acid, compared to the conventional CNPs. In addition, the carbon nanopipette can also be easily doped by a chemical reaction with urea, to display positive surface charges and high electrochemical activity for H2O2 oxidation/reduction. This work provides an easy way to tailor the surface structure and charges of the deposited carbon inside the pipettes and thus would further promote its broader usage in electrochemical sensing applications in biological fields.

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