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Crumpled Graphene Oxide Templating: Facile Synthesis of Morphology Engineered SnO2 Nanofibers for Superior Chemiresistor

Abstract

A new method of graphene oxide (GO) templating route is pioneered to prepare highly porous oxide fibers consisting of crumpled two-dimensional (2D) SnO2 nanosheets (NSs). GO flakes, which are functionalized with Sn2+ ions through electrostatic interaction between negatively charged GO and positively charged Sn ions (Sn-loaded GO), are directly electrospun. During electrospinning, Sn-loaded GO flakes undergo self-crumpling on the as-spun polymeric nanofibers. After subsequent pyrolysis, highly porous oxide NFs comprised of crumpled SnO2 NSs are achieved, offering three distinct benefits, i.e., (i) high surface area (~44 m2 g-1) and broad pore size distribution stemming from co-existence of 1D and 2D structures, (ii) formation and effective modulation of electron depletion region due to ultrasmall thickness of SnO2 NSs and small crystallite size (< 7 nm), and (iii) enhanced catalytic effect of Pt nanoparticles anchored on porous SnO2 NSs. As a result, under high humidity (95% RH), Pt-functionalized SnO2 NSs-assembled NFs exhibited exceptionally high acetone response (Rair/Rgas = 79.4 @ 1 ppm), excellent selectivity, fast response speed (~ 12.7 sec), and outstanding stability at 350 ℃. Sensor arrays were further utilized to discriminate simulated diabetic breath against healthy breath via pattern recognition, thus demonstrating potential feasibility for reliable sensing of breath biomarkers.

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Publication details

The article was received on 18 Apr 2018, accepted on 12 Jun 2018 and first published on 13 Jun 2018


Article type: Paper
DOI: 10.1039/C8TA03579B
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Crumpled Graphene Oxide Templating: Facile Synthesis of Morphology Engineered SnO2 Nanofibers for Superior Chemiresistor

    D. Kim, J. Jang, W. Koo and I. Kim, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA03579B

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