Coaxial electrospinning of WO3 nanotubes functionalized with bio-inspired Pd catalysts and their superior hydrogen sensing performance
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Author(s)
Choi, Seon-Jin
Kim, Jae Jin
Kim, Sang-Joon
Tuller, Harry L.
Kim, Il-Doo
Chattopadhyay, Saptarshi
Rutledge, Gregory C
Date Issued
December 2015
Journal
Nanoscale
Publisher
Royal Society of Chemistry
Citation
Choi, Seon-Jin, Chattopadhyay, Saptarshi, Kim, Jae Jin, Kim, Sang-Joon, Tuller, Harry L., Rutledge, Gregory C., and Kim, Il-Doo. “Coaxial Electrospinning of WO3nanotubes Functionalized with Bio-Inspired Pd Catalysts and Their Superior Hydrogen Sensing Performance.” Nanoscale 8, no. 17 (2016): 9159–9166. © 2015 Royal Society of Chemistry
Version
Author's final manuscript
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Department of Chemical Engineering
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DOI of Published Version
https://doi.org/10.1039/c5nr06611e
