Metal Oxide Nanostructures and Their Gas Sensing Properties: A Review
Top Cited Papers
Open Access
- 27 February 2012
- Vol. 12 (3), 2610-2631
- https://doi.org/10.3390/s120302610
Abstract
Metal oxide gas sensors are predominant solid-state gas detecting devices for domestic, commercial and industrial applications, which have many advantages such as low cost, easy production, and compact size. However, the performance of such sensors is significantly influenced by the morphology and structure of sensing materials, resulting in a great obstacle for gas sensors based on bulk materials or dense films to achieve highly-sensitive properties. Lots of metal oxide nanostructures have been developed to improve the gas sensing properties such as sensitivity, selectivity, response speed, and so on. Here, we provide a brief overview of metal oxide nanostructures and their gas sensing properties from the aspects of particle size, morphology and doping. When the particle size of metal oxide is close to or less than double thickness of the space-charge layer, the sensitivity of the sensor will increase remarkably, which would be called “small size effect”, yet small size of metal oxide nanoparticles will be compactly sintered together during the film coating process which is disadvantage for gas diffusion in them. In view of those reasons, nanostructures with many kinds of shapes such as porous nanotubes, porous nanospheres and so on have been investigated, that not only possessed large surface area and relatively mass reactive sites, but also formed relatively loose film structures which is an advantage for gas diffusion. Besides, doping is also an effective method to decrease particle size and improve gas sensing properties. Therefore, the gas sensing properties of metal oxide nanostructures assembled by nanoparticles are reviewed in this article. The effect of doping is also summarized and finally the perspectives of metal oxide gas sensor are given.Keywords
This publication has 107 references indexed in Scilit:
- Hydrothermal synthesis of hierarchical nanoparticle-decorated ZnO microdisks and the structure-enhanced acetylene sensing properties at high temperaturesSensors and Actuators B: Chemical, 2011
- Dense doping of indium to coral-like SnO2nanostructures through a plasma-assisted strategy for sensitive and selective detection of chlorobenzeneNanotechnology, 2011
- Gold-Nanoparticle-Functionalized In2O3 Nanowires as CO Gas Sensors with a Significant Enhancement in ResponseACS Applied Materials & Interfaces, 2011
- Solvothermal preparation and characterization of sheet-like CuInSe2 with hierarchically mesoporous structuresMaterials Letters, 2011
- Multilayered ZnO Nanosheets with 3D Porous Architectures: Synthesis and Gas Sensing ApplicationThe Journal of Physical Chemistry C, 2010
- Characterization of the gas sensors based on polymer-coated resonant microcantilevers for the detection of volatile organic compoundsAnalytica Chimica Acta, 2010
- Metal Oxide Gas Sensors: Sensitivity and Influencing FactorsSensors, 2010
- Gas Sensors Based on Semiconducting Metal Oxide One-Dimensional NanostructuresSensors, 2009
- Semiconducting Metal Oxide Based Sensors for Selective Gas Pollutant DetectionSensors, 2009
- Chemical control synthesis of nanocrystalline SnO2 by hydrothermal reactionMaterials Letters, 1999