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

被引:66
作者
Woo, Hyung-Sik [1 ]
Na, Chan Woong [1 ,2 ,3 ]
Lee, Jong-Heun [1 ]
机构
[1] Korea Univ, Dept Mat Sci & Engn, Seoul 02841, South Korea
[2] Univ Alabama, Ctr Mat Informat Technol, Tuscaloosa, AL 35487 USA
[3] Univ Alabama, Dept Chem, Box 870336, Tuscaloosa, AL 35487 USA
基金
新加坡国家研究基金会;
关键词
nanowires; gas sensors; selectivity; surface modification; CVD; ETHANOL SENSING CHARACTERISTICS; DOPED SNO2 NANOWIRES; TIN-OXIDE; THIN-FILMS; HIERARCHICAL NANOSTRUCTURES; SENSITIVE DETECTION; SURFACE-CHEMISTRY; HYDROGEN-SULFIDE; CHEMICAL SENSORS; ZNO NANOWIRES;
D O I
10.3390/s16091531
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
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 strategiessuch as doping/loading of noble metals, decorating/doping of catalytic metal oxides, and the formation of core-shell structureshave 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.
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页数:23
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