Heterogeneous, Porous 2D Oxide Sheets via Rapid Galvanic Replacement: Toward Superior HCHO Sensing Application

Cited 1 time in webofscience Cited 0 time in scopus
  • Hit : 50
  • Download : 0
2D heterogeneous oxide nanosheets (NSs) have attracted much attention in various scientific fields owing to their exceptional physicochemical properties. However, the fabrication of 2D oxide NSs with abundant p-n interfaces and large amounts of mesopores is extremely challenging. Here, a facile synthesis of highly porous 2D heterogeneous oxide NSs (e.g., SnO2/CoOx) is suggested through a 2D oxide exfoliation approach combined with a fast galvanic replacement reaction (GRR). The ultrathin (<5 nm) layered CoOx NSs are simply prepared by ion-exchange exfoliation and a subsequent GRR process that induces a rapid phase transition from p-type CoOx to n-type SnO2 metal oxides (<10 min). The controlled GRR process enables the creation of heterogeneous SnO2/CoOx NSs consisting of small SnO2 grain sizes (<10 nm), high porosity, numerous heterojunctions, and sub-10 nm thickness, which are highly advantageous characteristics for chemiresistive sensors. Due to the advantage of these features, the porous SnO2/CoOx NSs exhibit an unparalleled HCHO-sensing performance (R-air/R-gas > 35 @ 5 ppm with a response speed of 9.34 s) with exceptional selectivity compared to that of the state-of-the-art metal oxide-based HCHO gas sensors.
Publisher
WILEY-V C H VERLAG GMBH
Issue Date
2019-10
Language
English
Article Type
Article
Citation

ADVANCED FUNCTIONAL MATERIALS, v.29, no.42, pp.1903012

ISSN
1616-301X
DOI
10.1002/adfm.201903012
URI
http://hdl.handle.net/10203/270051
Appears in Collection
MS-Journal Papers(저널논문)
Files in This Item
There are no files associated with this item.
This item is cited by other documents in WoS
⊙ Detail Information in WoSⓡ Click to see webofscience_button
⊙ Cited 1 items in WoS Click to see citing articles in records_button

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0