Conductometric gas sensors based on metal oxides modified with gold nanoparticles: a review

By Ghenadii Korotcenkov, Vladimir Brinzari, B. Cho. Microchimica Acta, 2016

154 citations recorded by the source corpus.

AbstractThis review (with 170 refs.) discusses approaches towards surface functionalizaton of metal oxides by gold nanoparticles, and the application of the resulting nanomaterials in resistive gas sensors. The articles is subdivided into sections on (a) methods for modification of metal oxides with gold nanoparticles; (b) the response of gold nanoparticle-modified metal oxide sensors to gaseous species, (c) a discussion of the limitations of such sensors, and (d) a discussion on future tasks and trends along with an outlook. It is shown that, in order to achieve significant improvements in sensor parameters, it is necessary to warrant a good control the size and density of gold nanoparticles on the surface of metal oxide crystallites, the state of gold in the cluster, and the properties of the metal oxide support. Current challenges include an improved reproducibility of sensor preparation, better long-term stabilities, and a better resistance to sintering and poisoning of gold clusters during operation. Additional research focused on better understanding the role of gold clusters and nanoparticles in gas-sensing effects is also required. Graphical AbstractThe Figure illustrates the growth in the number of publications devoted to the analysis of gas-sensitive properties of metal oxides modified by gold nanoparticles and shows SEM image of SnO2 films modified with gold nanoparticles.

Subfields: Biomedical Engineering, Electrical and Electronic Engineering, Materials Chemistry

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