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02455 am a22002773u 4500 |
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|a Choi, Seon-Jin
|e author
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|a Massachusetts Institute of Technology. Department of Chemical Engineering
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|a Rutledge, Gregory C
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|a Chattopadhyay, Saptarshi
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|a Rutledge, Gregory C
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|a Kim, Jae Jin
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|a Kim, Sang-Joon
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|a Tuller, Harry L.
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|a Kim, Il-Doo
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|a Chattopadhyay, Saptarshi
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|a Rutledge, Gregory C
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|a Coaxial electrospinning of WO3 nanotubes functionalized with bio-inspired Pd catalysts and their superior hydrogen sensing performance
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|b Royal Society of Chemistry,
|c 2017-04-11T14:41:30Z.
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|z Get fulltext
|u http://hdl.handle.net/1721.1/108045
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|a Macroporous WO₃ nanotubes (NTs) functionalized with nanoscale catalysts were fabricated using coaxial electrospinning combined with sacrificial templating and protein-encapsulated catalysts. The macroporous thin-walled nanotubular structures were obtained by introducing colloidal polystyrene (PS) particles to a shell solution of W precursor and poly(vinylpyrrolidone). After coaxial electrospinning with a core liquid of mineral oil and subsequent calcination, open pores with an average diameter of 173 nm were formed on the surface of WO₃ NTs due to decomposition of the PS colloids. In addition, catalytic Pd nanoparticles (NPs) were synthesized using bio-inspired protein cages, i.e., apoferritin, and uniformly dispersed within the shell solution and subsequently on the WO₃ NTs. The resulting Pd functionalized macroporous WO₃ NTs were demonstrated to be high performance hydrogen (H₂) sensors. In particular, Pd-functionalized macroporous WO₃ NTs exhibited a very high H₂ response (R[subscript air]/R[subscript gas]) of 17.6 at 500 ppm with a short response time. Furthermore, the NTs were shown to be highly selective for H₂ compared to other gases such as carbon monoxide (CO), ammonia (NH₃), and methane (CH₄). The results demonstrate a new synthetic method to prepare highly porous nanotubular structures with well-dispersed nanoscale catalysts, which can provide improved microstructures for chemical sensing.
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|a Intel Corporation
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|a en_US
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|a Article
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|t Nanoscale
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