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

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Abstract

This 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.

The 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.

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Acknowledgments

This work was supported by the Ministry of Science, ICT and Future Planning (MSIP) of the Republic of Korea, by the National Research Foundation (NRF) grants funded by the MSIP of Korea (Bank for Quantum Electronic Materials, Nos. 2011-0028736 and 2013-K000315), and partly by the Moldova Government under grant 15.817.02.29F and ASM-STCU project #5937.

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Authors and Affiliations

  1. School of Material Science and Engineering, Gwangju Institute of Science and Technology, 123 Cheomdan-gwagiro, Buk-gu, Gwangju, 500-712, Republic of Korea

    Ghenadii Korotcenkov & Beong K. Cho

  2. Department of Physics and Engineering, State University of Moldova, Chisinau, MD-2009, Republic of Moldova

    Vladimir Brinzari

Authors
  1. Ghenadii Korotcenkov
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  2. Vladimir Brinzari
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  3. Beong K. Cho
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Correspondence to Ghenadii Korotcenkov or Beong K. Cho.

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Highlights

• The paper gives a comprehensive view of the problem of gold nanoparticls using for optimization of conductometric gas sensors

• The present review is the first one that generalizes and summarizes results in this area

• AuNP influence on the response of metal oxide gas sensors is analyzed

• Modification with gold is a promising approach to improvement of gas sensor performances

• The achievement of significant improvement of gas-sensor parameters is not a trivial task

• Limitations of AuNPs use for surface functionalization in gas sensors are discussed

• Additional studies of gas sensors modified with AuNPs are required

• Tasks for further research are formulated

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Korotcenkov, G., Brinzari, V. & Cho, B.K. Conductometric gas sensors based on metal oxides modified with gold nanoparticles: a review. Microchim Acta 183, 1033–1054 (2016). https://doi.org/10.1007/s00604-015-1741-z

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  • DOI: https://doi.org/10.1007/s00604-015-1741-z

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