NiO/NiWO4 Composite Yolk-Shell Spheres with Nanoscale NiO Outer Layer for Ultrasensitive and Selective Detection of Subppm-level p-Xylene
- Authors
- Kim, Tae-Hyung; Kwak, Chang-Hoon; Lee, Jong-Heun
- Issue Date
- 20-9월-2017
- Publisher
- AMER CHEMICAL SOC
- Keywords
- p-xylene; NiO/NiWO4; mesopore; heterostructure; gas sensor
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v.9, no.37, pp.32034 - 32043
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- Volume
- 9
- Number
- 37
- Start Page
- 32034
- End Page
- 32043
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/82206
- DOI
- 10.1021/acsami.7b10294
- ISSN
- 1944-8244
- Abstract
- NiO/NiWO4 composite yolk shell spheres with a nanoscale NiO outer layer were prepared using one-pot ultrasonic spray pyrolysis and their gas sensing characteristics were studied. The NiO/NiWO4 yolk shell spheres exhibited an extremely high response to 5 ppm p-xylene (ratio of resistance to gas and air = 343.5) and negligible cross -responses to 5 ppm ethanol, ammonia, carbon monoxide, hydrogen, and benzene, whereas pure NiO yolk shell spheres showed very low responses and selectivity to all the analyte gases. The detection limit for p-xylene was as low as 22.7 ppb. This ultrasensitive and selective detection of p-xylene is attributed to a synergistic catalytic effect between NiO and NiWO4, high gas accessibility with large specific surface area, and increased chemiresistive variation due to the formation of a heterojunction. The NiO/NiWO4 yolk shell spheres with a thin NiO outer layer can be used to detect subppm-level p-xylene in a highly sensitive and selective manner for monitoring indoor air pollution.
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Collections - College of Engineering > Department of Materials Science and Engineering > 1. Journal Articles
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