Next Article in Journal
Features of a Self-Mixing Laser Diode Operating Near Relaxation Oscillation
Next Article in Special Issue
Towards Enhanced Gas Sensor Performance with Fluoropolymer Membranes
Previous Article in Journal
Increasing the Lifetime of Mobile WSNs via Dynamic Optimization of Sensor Node Communication Activity
Previous Article in Special Issue
Selectivity Enhancement by Using Double-Layer MOX-Based Gas Sensors Prepared by Flame Spray Pyrolysis (FSP)
Article Menu

Export Article

Open AccessReview

Design of Highly Selective Gas Sensors via Physicochemical Modification of Oxide Nanowires: Overview

Department of Materials Science and Engineering, Korea University, Seoul 02841, Korea
Author to whom correspondence should be addressed.
Academic Editors: Eduard Llobet and Stella Vallejos
Sensors 2016, 16(9), 1531;
Received: 11 August 2016 / Revised: 9 September 2016 / Accepted: 16 September 2016 / Published: 20 September 2016
(This article belongs to the Special Issue Gas Nanosensors)
PDF [5980 KB, uploaded 23 September 2016]


Strategies for the enhancement of gas sensing properties, and specifically the improvement of gas selectivity of metal oxide semiconductor nanowire (NW) networks grown by chemical vapor deposition and thermal evaporation, are reviewed. Highly crystalline NWs grown by vapor-phase routes have various advantages, and thus have been applied in the field of gas sensors over the years. In particular, n-type NWs such as SnO2, ZnO, and In2O3 are widely studied because of their simple synthetic preparation and high gas response. However, due to their usually high responses to C2H5OH and NO2, the selective detection of other harmful and toxic gases using oxide NWs remains a challenging issue. Various strategies—such as doping/loading of noble metals, decorating/doping of catalytic metal oxides, and the formation of core–shell structures—have been explored to enhance gas selectivity and sensitivity, and are discussed herein. Additional methods such as the transformation of n-type into p-type NWs and the formation of catalyst-doped hierarchical structures by branch growth have also proven to be promising for the enhancement of gas selectivity. Accordingly, the physicochemical modification of oxide NWs via various methods provides new strategies to achieve the selective detection of a specific gas, and after further investigations, this approach could pave a new way in the field of NW-based semiconductor-type gas sensors. View Full-Text
Keywords: nanowires; gas sensors; selectivity; surface modification; CVD nanowires; gas sensors; selectivity; surface modification; CVD

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

Share & Cite This Article

MDPI and ACS Style

Woo, H.-S.; Na, C.W.; Lee, J.-H. Design of Highly Selective Gas Sensors via Physicochemical Modification of Oxide Nanowires: Overview. Sensors 2016, 16, 1531.

Show more citation formats Show less citations formats

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

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Sensors EISSN 1424-8220 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top