Bimodally Porous WO3 Microbelts Functionalized with Pt Catalysts for Selective H2 S Sensors

ACS Applied Materials & Interfaces
Min-Hyeok KimIl-Doo Kim

Abstract

Bimodally meso- (2-50 nm) and macroporous (>50 nm) WO3 microbelts (MBs) functionalized with sub-3 nm Pt catalysts were fabricated via the electrospinning technique followed by subsequent calcination. Importantly, apoferritin (Apo), tea saponin and polystyrene colloid spheres (750 nm) dispersed in an electrospinning solution acted as forming agents for producing meso- and macropores on WO3 MBs during calcination. Particularly, mesopores provide not only numerous reaction sites for effective chemical reactions, but also facilitate gas diffusion into the interior of the WO3 MBs, dominated by Knudsen diffusion. The macropores further accelerate gas permeability in the interior and on the exterior of the WO3 MBs. In addition, Pt nanoparticles with mean diameters of 2.27 nm were synthesized by using biological protein cages, such as Apo, to further enhance the gas sensing performance. Bimodally porous WO3 MBs functionalized by Pt catalysts showed remarkably high hydrogen sulfide (H2S) response ( Rair/ Rgas = 61 @ 1 ppm) and superior selectivity to H2S against other interfering gases, such as acetone (CH3COCH3), ethanol (C2H5OH), ammonia (NH3), and carbon monoxide (CO). These results demonstrate a high potential for the feasibility of...Continue Reading

References

Mar 18, 2008·Journal of the American Chemical Society·Zhenyu LiYen Wei
Apr 1, 2008·Journal of the American Chemical Society·Fei WangTimothy M Swager
Jan 27, 2010·Environmental Science & Technology·Kyle R RatinacFilip Braet
Jan 1, 2010·Sensors·Chengxiang WangRui Gao
Dec 13, 2016·ACS Applied Materials & Interfaces·Bo-Young KimJong-Heun Lee

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Citations

May 9, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Jie WuXinlu Wang
Dec 20, 2019·ACS Applied Materials & Interfaces·Wenshuang ZhangJiaqiang Xu
Nov 27, 2020·ACS Applied Materials & Interfaces·Yu ZhangLihua Huo
May 6, 2020·ACS Applied Materials & Interfaces·Po-Yi ChangOlivier Soppera
Jan 10, 2019·ACS Sensors·Andreas T GüntnerSotiris E Pratsinis
Sep 9, 2021·ACS Biomaterials Science & Engineering·Xun LiuKun Qian

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