Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 6, Pages 5835-5844Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b19641
Keywords
three-dimensional inverse opal microspheres; one-step ultrasonic spray pyrolysis; self-assembly sulfonated PS spheres; PdO@In2O3 composites; high-performance acetone gas sensor
Funding
- National Key Research and Development Program of China [2016YFC0207300]
- National Nature Science Foundation of China [61722305, 61503148, 61520106003, 61327804]
- National High-Tech Research and Development Program of China (863 Program) [2014AA06A505]
- Science and Technology Development Program of Jilin Province [20170520162JH]
- China Postdoctoral Science Foundation [2017T100208, 2015M580247]
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The design of semiconductor metal oxides (SMOs) with well-ordered porous structure has attracted tremendous attention owing to their larger specific surface area. Herein, three-dimensional inverse opal In2O3 microspheres (3D-IO In2O3 MSs) were fabricated through one-step ultrasonic spray pyrolysis (USP) which employed self-assembly sulfonated polystyrene (S-PS) spheres as a sacrificial template. The spherical pores observed in the 3D-IO In2O3 MSs had diameters of about 4 and 80 nm. Subsequently, the catalytic palladium oxide nanoparticles (PdO NPs) were loaded on 3D-IO In2O3 MSs via a simple impregnation method, and their gas sensing properties were investigated. In a comparison with pristine 3D-IO In2O3 MSs, the 3D-IO PdO@In2O3 MSs exhibited a 3.9 times higher response (R-air/R-gas = 50.9) to 100 ppm acetone at 250 degrees C and a good acetone selectivity. The detection limit for acetone could extend down to ppb level. Furthermore, the 3D-IO PdO@In2O3 MSs-based sensor also possess good long-term stability. The extraordinary sensing performance can be attributed to the novel 3D periodic porous structure, highly three-dimensional interconnection, larger specific surface area, size-tunable (meso- and macroscale) bimodal pores, and PdO NP catalysts.
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