Next Article in Journal / Special Issue
Chemical Vapour Deposition of Gas Sensitive Metal Oxides
Previous Article in Journal
Acknowledgement to Reviewers of Chemosensors in 2015
Previous Article in Special Issue
Building Selectivity for NO Sensing in a NOx Mixture with Sonochemically Prepared CuO Structures
 
 
Article

Gas Sensing Studies of an n-n Hetero-Junction Array Based on SnO2 and ZnO Composites

1
Christopher Ingold Laboratories, Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, UK
2
School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, London, E1 4NS, UK
*
Author to whom correspondence should be addressed.
Academic Editor: Igor Medintz
Chemosensors 2016, 4(1), 3; https://doi.org/10.3390/chemosensors4010003
Received: 23 November 2015 / Revised: 13 January 2016 / Accepted: 26 January 2016 / Published: 4 February 2016
(This article belongs to the Special Issue Chemical Vapor Sensing)
A composite metal oxide semiconductor (MOS) sensor array based on tin dioxide (SNO2) and zinc oxide (ZnO) has been fabricated using a straight forward mechanical mixing method. The array was characterized using X-ray photoelectron spectroscopy, scanning electron microscopy, Raman spectroscopy and X-ray diffraction. The array was evaluated against a number of environmentally important reducing and oxidizing gases across a range of operating temperatures (300–500 °C). The highest response achieved was against 100 ppm ethanol by the 50 wt% ZnO–50 wt% SnO2 device, which exhibited a response of 109.1, a 4.5-fold increase with respect to the pure SnO2 counterpart (which displayed a response of 24.4) and a 12.3-fold enhancement with respect to the pure ZnO counterpart (which was associated with a response of 8.9), towards the same concentration of the analyte. Cross sensitivity studies were also carried out against a variety of reducing gases at an operating temperature of 300 °C. The sensors array showed selectivity towards ethanol. The enhanced behaviour of the mixed oxide materials was influenced by junction effects, composition, the packing structure and the device microstructure. The results show that it is possible to tune the sensitivity and selectivity of a composite sensor, through a simple change in the composition of the composite. View Full-Text
Keywords: environmental gas sensing; hetero-junctions; metal oxide sensors; SnO2; ZnO environmental gas sensing; hetero-junctions; metal oxide sensors; SnO2; ZnO
Show Figures

Graphical abstract

MDPI and ACS Style

Naik, A.; Parkin, I.; Binions, R. Gas Sensing Studies of an n-n Hetero-Junction Array Based on SnO2 and ZnO Composites. Chemosensors 2016, 4, 3. https://doi.org/10.3390/chemosensors4010003

AMA Style

Naik A, Parkin I, Binions R. Gas Sensing Studies of an n-n Hetero-Junction Array Based on SnO2 and ZnO Composites. Chemosensors. 2016; 4(1):3. https://doi.org/10.3390/chemosensors4010003

Chicago/Turabian Style

Naik, Anupriya, Ivan Parkin, and Russell Binions. 2016. "Gas Sensing Studies of an n-n Hetero-Junction Array Based on SnO2 and ZnO Composites" Chemosensors 4, no. 1: 3. https://doi.org/10.3390/chemosensors4010003

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop