Campus Units

Chemical and Biological Engineering, NSF Engineering Research Center for Biorenewable Chemicals

Document Type

Article

Research Focus Area

Catalysis and Reaction Engineering

Publication Version

Submitted Manuscript

Publication Date

2015

Journal or Book Title

Nanotechnology

Volume

26

Issue

2

First Page

024004

DOI

10.1088/0957-4484/26/2/024004

Abstract

Amorphous titanium dioxide-coated carbon nanotubes (CNTs) were prepared by atomic layer deposition (ALD) and investigated as sensing layers for resistive NO2 and O2 gas sensors. By varying ALD process conditions and CNT structure, heterostructures with different metal oxide grain size, morphology and coating thickness were synthesized. Higher responses were observed with homogeneous and continuous 5.5 nm thick films onto CNTs at an operating temperature of 150 °C, while CNTs decorated with either discontinuous film or TiO2 nanoparticles showed a weak response close to the one of device made of bare CNTs. An unexpected p-type behavior in presence of the target gas was also noticed, independently of the metal oxide morphology and thickness. Based on previous works, hypotheses were made in order to explain the p-type behavior of TiO2/CNT sensors.

Comments

This is a manuscript of an article published as Marichy, Catherine, Nicola Donato, Mariangela Latino, Marc Georg Willinger, Jean-Philippe Tessonnier, Giovanni Neri, and Nicola Pinna. "Gas sensing properties and p-type response of ALD TiO2 coated carbon nanotubes." Nanotechnology 26, no. 2 (2014): 024004. DOI: 10.1088/0957-4484/26/2/024004. Posted with permission.

Copyright Owner

IOP Publishing Ltd.

Language

en

File Format

application/pdf

Published Version

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