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Journal Article A Highly Susceptive Mesoporous Hematite Microcube Architecture for Sustainable P-type Formaldehyde Gas Sensors
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Authors
Hyung Ju Park, Seok Yong Hong, Dong Hyun Chun, Shin Wook Kang, Ji Chan Park, Dae-Sik Lee
Issue Date
2019-05
Citation
Sensors and Actuators B : Chemical, v.287, pp.437-444
ISSN
0925-4005
Publisher
Elsevier
Language
English
Type
Journal Article
DOI
https://dx.doi.org/10.1016/j.snb.2019.01.153
Abstract
The mesoporous hematite cubic frameworks (慣-Fe2O3 microcube) with 2??3 μm sizes were prepared using a simple thermal treatment of the iron oxalate hydrate cubes (4 μm). The 慣-Fe2O3 microcube structure with a high surface area (36 m2 g?닋1) had three-dimensionally connected small grain sizes (??18 nm). In formaldehyde (HCHO) gas sensing, the fabricated device by 慣-Fe2O3 microcubes shows excellent detection ability even at low HCHO concentration (??50 ppb) and high response reaching to Rgas/Rair = 5.2 at 1 ppm as well as long-term stability, compared with conventional Fe2O3 nanoparticles.
KSP Keywords
Detection ability, Formaldehyde gas, Gas sensing, Grain size, High response, Long term stability, Thermal treatments, gas sensors, high surface area, iron oxalate, p-Type