4.7 Article

Synthesis of In2O3 nanocubes, nanocube clusters, and nanocubes-embedded Au nanoparticles for conductometric CO sensors

期刊

SENSORS AND ACTUATORS B-CHEMICAL
卷 345, 期 -, 页码 -

出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2021.130433

关键词

Controllable synthesis; Cluster In2O3; Au modified; Trace CO detection

资金

  1. National Natural Science Foundation of China [61904122, 61901186]
  2. Natural Science Foundation of Shanxi Province [201801D221188, 201901D111090]
  3. University Science and Technology Innovation Project of Shanxi Province [2019L0281]

向作者/读者索取更多资源

The study successfully prepared different sizes of cubic indium oxide nanocube clusters and their composites with Au nanoparticles using a solvothermal method, demonstrating that the Au@In2O3 system exhibits the best sensing properties. The Au nanoparticles enhance the receptor function of the semiconductor gas sensor, leading to increased sensing response.
Cubic indium oxide (In2O3) of different sizes, In2O3 nanocube clusters, and In2O3 nanocube clusters embedded Au nanoparticles were obtained using solvothermal method. Compared with the large size or monodispersed In2O3 nanocubes, In2O3 nanocube clusters shows a higher response to carbon monoxide (CO), due to increased surface area and pore structures. Moreover, In2O3 nanocube clusters with an Au nanoparticle core (Au@In2O3) leads to a further increase of response to CO. Our results also show that 1 at% Au@In2O3 system presents the best sensing properties with response of 42.1-100 ppm CO, response/recovery speed of 2/2 s and ultra-low limit detection. The CO concentration dependence of the sensor response implies that similar to 0.5 ppb and similar to 28 ppb could be detected with a response value of 1.4 under 20 % and 93 % relative humidity, respectively. This increase in sensing response is due to the fact that Au nanoparticles can enhance the receptor function of the semiconductor gas sensor. Remarkably, Au@In2O3 system unifies three key factors of a semiconductor gas sensor, i.e., high specific surface area, high porosity, and noble metal loading.

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