1 research outputs found
A Hollow Assembly and Its Three-Dimensional Network Formation of Single-Crystalline Co<sub>3</sub>O<sub>4</sub> Nanoparticles for Ultrasensitive Formaldehyde Gas Sensors
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 Co<sub>3</sub>O<sub>4</sub> 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