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Nonstoichiometric Co-rich ZnCo2O4 Hollow Nanospheres for High Performance Formaldehyde Detection at ppb Levels

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Title
Nonstoichiometric Co-rich ZnCo2O4 Hollow Nanospheres for High Performance Formaldehyde Detection at ppb Levels
Author(s)
Park, HJ; Jinmo Kim; Choi, NJ; Hyunjoon Song; Lee, DS
Subject
ZnCo2O4, ; hollow nanosphere, ; formaldehyde sensing, ; ppb level, ; selectivity
Publication Date
2016-02
Journal
ACS APPLIED MATERIALS & INTERFACES, v.8, no.5, pp.3233 - 3240
Publisher
AMER CHEMICAL SOC
Abstract
Since metal oxide semiconductors were investigated as chemiresistors, rapid advances have been reported in this, field. However, better performance metrics are still required, such as higher sensitivity and selectivity levels for practical applications. To improve the sensing performance, we discuss an optimal composition of the active sensing material, nonstoichiometric Co-rich ZnCo2O4, prepared by the partial substitution of Co2+ into Zn2+ in Co3O4 without altering a hollow sphere morphology. Remarkably) this Co-rich ZnCo2O4 phase achieved detection limits for formaldehyde as low as 13 ppb in experimental measurements and 2 ppb in theory, which were the lowest values ever reported from, actual measurements at a working temperature of 225 degrees C. It was also unprecedented that the selectivity for formaldehyde was greatly enhanced with respect to the selectivity levels against other volatile organic compounds (VOCs). These excellent sensing performances are due to the optimal composition of the Co-rich ZriCo(2)O(4) material with a proper hole concentration and well-organized conductive network. © 2016 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/3310
DOI
10.1021/acsami.5b10862
ISSN
1944-8244
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > 1. Journal Papers (저널논문)
Files in This Item:
ACS Appl. Mater. Interfaces 2016, 8, 3233−3240.pdfDownload

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