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학술지 A Hollow Assembly and Its Three-Dimensional Network Formation of Single-Crystalline Co3O4 Nanoparticles for Ultrasensitive Formaldehyde Gas Sensors
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김재영, 최낙진, 박형주, 김진모, 이대식, 송현준
The Journal of Physical Chemistry C, v.118 no.45, pp.25994-26002
American Chemical Society(ACS)
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 제안 키워드
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)