NDLI: Thin-walled SnO<sub>2</sub> nanotubes functionalized with Pt and Au catalysts via the protein templating route and their selective detection of acetone and hydrogen sulfide molecules

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Thin-walled SnO₂ nanotubes functionalized with Pt and Au catalysts via the protein templating route and their selective detection of acetone and hydrogen sulfide molecules

Content Provider	Royal Society of Chemistry (RSC)
Author	Choi, Seon-Jin Rothschild, Avner Kim, Il-Doo Hakim, Meggie Jang, Ji-Soo Kim, Nam-Hoon Kim, Sang-Joon
Copyright Year	2015
Abstract	Bio-inspired Pt (∼2 nm) and Au (∼2.7 nm) catalysts encapsulated by a protein shell, i.e., Pt-apoferritin (Pt@AF) and Au-apoferriten (Au@AF), were synthesized via the hollow protein nanocage (apoferritin) templating route and directly functionalized on the interior and exterior walls of electrospun SnO2 nanotubes (NTs) during controlled single-nozzle electrospinning followed by high temperature calcination with heating rate control. Fast crystallization of the exterior shell and outward diffusion of the interior Sn precursors and crystallites result in the continued growth of a tubular wall, which is related to rapid heating driven Ostwald-ripening behavior. Very importantly, the Pt and Au nanoparticles (NPs) were immobilized onto thin-walled SnO2 NTs with a diameter of ∼350 nm and a shell thickness of ∼40 nm without any aggregation of catalysts due to high dispersibility, which originated from repulsive electrostatic (Coulombic) forces acting on the surface charged protein shells, leading to an enhanced catalytic effect and outstanding gas sensing properties. Pt-loaded SnO2 NTs exhibited superior acetone response (Rair/Rgas = 92 at 5 ppm) compared to pure SnO2 NFs (Rair/Rgas = 4.8 at 5 ppm) and SnO2 NTs (Rair/Rgas = 11 at 5 ppm) while Au-loaded SnO2 NTs showed a high response when exposed to hydrogen sulfide (Rair/Rgas = 34 at 5 ppm), offering selective gas detection with minimal cross-sensitivity against other interfering gases such as NH3, CO, NO, C6H5CH3, and C5H12. Our results provide a new insight into facile, cost-effective, and highly dispersible catalyst loading on the interior and exterior walls of hollow metal oxide NTs via simple electrospinning as a potential breath analyzer.
Starting Page	16417
Ending Page	16426
Page Count	10
File Format	HTM / HTML PDF
ISSN	20403364
Volume Number	7
Issue Number	39
Journal	Nanoscale
DOI	10.1039/c5nr04487a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Hydrogen sulfide Ammonia Ferritin Electrospinning Calcination Diffusion Protein Acetone
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology

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