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Volume 18
Issue 4
10.3390/s18040956
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Article

Gas Sensing Properties of p-Co3O4/n-TiO2 Nanotube Heterostructures

by
Onur Alev
,
Alp Kılıç
,
Çiğdem Çakırlar
,
Serkan Büyükköse
and
Zafer Ziya Öztürk
*
Department of Physics, Gebze Technical University, 41400 Kocaeli, Turkey
*
Author to whom correspondence should be addressed.
Sensors 2018, 18(4), 956; https://doi.org/10.3390/s18040956
Submission received: 20 February 2018 / Revised: 16 March 2018 / Accepted: 21 March 2018 / Published: 23 March 2018
(This article belongs to the Special Issue I3S 2017 Selected Papers)
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Abstract

In this paper, we fabricated p-Co3O4/n-TiO2 heterostructures and investigated their gas sensing properties. The structural and morphological characterization were performed by scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy analysis (XPS). The electrical properties of the heterostructure were studied within the temperature range from 293 K to 423 K. Changes in electrical properties and sensing behavior against reducing and oxidizing gases were attributed to the formation of p–n heterojunctions at the Co3O4 and TiO2 interface. In comparison with sensing performed with pristine TiO2 nanotubes (NTs), a significant improvement in H2 sensing at 200 °C was observed, while the sensing response against NO2 decreased for the heterostructures. Additionally, a response against toluene gas, in contrast to pristine TiO2 NTs, appeared in the Co3O4/TiO2 heterostructure samples.
Keywords: metal-oxide; gas sensor; nanostructures; heterostructure; nanotubes; TiO2; Co3O4 metal-oxide; gas sensor; nanostructures; heterostructure; nanotubes; TiO2; Co3O4

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MDPI and ACS Style

Alev, O.; Kılıç, A.; Çakırlar, Ç.; Büyükköse, S.; Öztürk, Z.Z. Gas Sensing Properties of p-Co3O4/n-TiO2 Nanotube Heterostructures. Sensors 2018, 18, 956. https://doi.org/10.3390/s18040956

AMA Style

Alev O, Kılıç A, Çakırlar Ç, Büyükköse S, Öztürk ZZ. Gas Sensing Properties of p-Co3O4/n-TiO2 Nanotube Heterostructures. Sensors. 2018; 18(4):956. https://doi.org/10.3390/s18040956

Chicago/Turabian Style

Alev, Onur, Alp Kılıç, Çiğdem Çakırlar, Serkan Büyükköse, and Zafer Ziya Öztürk. 2018. "Gas Sensing Properties of p-Co3O4/n-TiO2 Nanotube Heterostructures" Sensors 18, no. 4: 956. https://doi.org/10.3390/s18040956

APA Style

Alev, O., Kılıç, A., Çakırlar, Ç., Büyükköse, S., & Öztürk, Z. Z. (2018). Gas Sensing Properties of p-Co3O4/n-TiO2 Nanotube Heterostructures. Sensors, 18(4), 956. https://doi.org/10.3390/s18040956

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