Heterogeneous Metal Oxide?Graphene Thorn-Bush Single Fiber as a Freestanding Chemiresistor

Title
Heterogeneous Metal Oxide?Graphene Thorn-Bush Single Fiber as a Freestanding Chemiresistor
Authors
정현수유하영장지수최선진구원태이지영김동하강준영정영진김일두
Issue Date
2019-03
Publisher
ACS Applied Materials & Interfaces
Citation
VOL 11, NO 10-10217
Abstract
The development of freestanding fiber-type chemiresistors, having high integration ability with various portable electronics including smart clothing systems, is highly demanding for the next-generation wearable sensing platforms. However, critical challenges stemming from the irreversible chemical sensing kinetics and weak reliability of the freestanding fiber-type chemiresistor hinder their practical use. In this work, for the first time, we report on the potential suitability of the freestanding and ultraporous reduced graphene oxide fiber functionalized with WO3 nanorods (porous WO3 NRs-RGO composite fiber) as a sensitive nitrogen dioxide (NO2) detector. By employing a tunicate cellulose nanofiber (TCNF), which is a unique animal-type cellulose, the numerous mesopores are formed on a wet-spun TCNF-GO composite fiber, unlike a bare GO fiber with dense surface structure. More interestingly, due to the superior wettability of TCNF, the aqueous tungsten precursor is uniformly adsorbed on an ultraporous TCNF-GO fiber, and subsequent heat treatment results in the thermal reduction of a TCNF-GO fiber and hierarchical growth of WO3 NRs perpendicular to the porous RGO fiber (porous WO3 NRs-RGO fiber). The freestanding porous WO3 NRs-RGO fiber shows a notable response to 1 ppm NO2. Furthermore, we successfully demonstrate reversible NO2 sensing characteristics of the porous WO3 NRs-RGO fiber, which is integrated on a wrist-type wearable sensing device.
URI
http://pubs.kist.re.kr/handle/201004/69142
ISSN
1944-8244
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KIST Publication > Article
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