One-Step Synthesis of Co-Doped In₂O₃ Nanorods for High Response of Formaldehyde Sensor at Low Temperature

Abstract

Uniform and monodisperse Co-doped InO nanorods were fabricated by a facile and environmentally friendly hydrothermal strategy that combined the subsequent annealing process, and their morphology, structure, and formaldehyde (HCHO) gas sensing performance were investigated systematically. Both pure and Co-doped InO nanorods had a high specific surface area, which could offer abundant reaction sites to gas molecular diffusion and improve the response of the gas sensor. Results revealed that the InO/1%Co nanorods exhibited a higher response of 23.2 for 10 ppm of HCHO than that of the pure InO nanorods by 4.5 times at 130 °C. More importantly, the InO/1%Co nanorods also presented outstanding selectivity and long-term stability. The superior gas sensing properties were mainly attributed to the incorporation of Co, which suggested the important role of the amount of oxygen vacancies and adsorbed oxygen in enhancing HCHO sensing performance of InO sensors.

Porous reduced graphene oxide (rGO)/WO3 nanocomposites for the enhanced detection of NH3 at room temperature

“…The long-term acceptable exposure limit of NH 3 is around 50 ppm, as reported by the occupational safety and health administration (OSHA). [3][4][5] Exposure to NH 3 above this limit may lead to serious health issues. Thus, selective and sensitive detection of NH 3 is a vital safety measure for a pollution-free ecosystem.…”

Facile synthesis of In2O3 nanoparticles with high response to formaldehyde at low temperature

“…Currently, the most extensively approved mechanism of In 2 O 3 (the typical n‐type semiconductor) is the surface depletion layer theory . Generally, the reaction of absorbed oxygen and the target gas on the surface affects the thickness of depletion layer, which leading to the change of resistance .…”

Нанокомпозитные пленки Co-In-=SUB=-2-=/SUB=-O-=SUB=-3-=/SUB=-: синтез, структурные и магнитные свойства

“…In 2 O 3 привлекают внимание в связи с их возможным использованием в устройствах оптоэлектроники, спинтроники [18][19][20][21], газовой сенсорике [22][23][24][25].…”