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Journal Article A Hollow Assembly and Its Three-Dimensional Network Formation of Single-Crystalline Co3O4 Nanoparticles for Ultrasensitive Formaldehyde Gas Sensors
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Authors
Jae Young Kim, Nak-Jin Choi, Hyung Ju Park, Jinmo Kim, Dae-Sik Lee, Hyunjoon Song
Issue Date
2014-11
Citation
The Journal of Physical Chemistry C, v.118, no.45, pp.25994-26002
ISSN
1932-7447
Publisher
American Chemical Society(ACS)
Language
English
Type
Journal Article
DOI
https://dx.doi.org/10.1021/jp505791v
Project Code
14MB1600, Development of self-powered smart sensor node platform for smart&green building, Kwon Jong-Kee
Abstract
The detection of formaldehyde at a very low concentration is a significant research topic, due to its detrimental impact on human health. In the present study, we fabricated a hierarchical structure by the rational assembly of single-crystalline Co3O4 nanoparticles. A hollow morphology using sacrificial ZnO spheres could form a three-dimensional conducting network in a solid state. The resulting structure was selectively active for formaldehyde sensing, and the detection limit was 50 ppb, which was nearly close to the record-high value among the other semiconducting materials. Such superior properties were attributed to the regular, hierarchically assembled structures with a small crystalline domain size, a thin hollow morphology with a large surface area, and a three-dimensional conductive network with a narrow diameter. We believe that this hierarchical assembly can show great potential as a platform for improving human health through the monitoring of indoor environments.
KSP Keywords
Conducting network, Conductive network, Crystalline domain size, Detection limit, Formaldehyde gas, Hierarchical Assembly, Indoor Environment, Large surface area, Low concentration, Single-crystalline, Three dimensional(3D)