材料科学
煅烧
催化作用
化学工程
静电纺丝
介孔材料
大孔隙
多孔性
聚苯乙烯
努森扩散
胶体
纳米颗粒
扩散
作者
Min-Hyeok Kim,Ji-Soo Jang,Won-Tae Koo,Seon-Jin Choi,Sang-Joon Kim,Dong Ha Kim,Il-Doo Kim
标识
DOI:10.1021/acsami.8b00588
摘要
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 @...
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