High performance In2(MoO4)3@In2O3 nanocomposites gas sensor with long-term stability.

Metal oxide semiconductor (MOSC) sensors based on nanocrystalline MoO 3 , In 2 O 3 , and their composites are considered to be very sensitive to detect low concentrations of ethanol, ozone, hydrogen, formaldehyde, and nitrogen dioxide. Here, we firstly introduced In 2 (MoO 4) 3 phase, which has excellent negative thermal expansion and high electric conductivity properties, into In 2 (MoO 4) 3 @In 2 O 3 crystalline nanocomposites. The gas-sensing performance of the In 2 (MoO 4) 3 @In 2 O 3 nanocomposites was studied upon exposure to the ethanol gas with different concentration from 5 to 300 ppm at the optimum temperature (300 °C). What's more, the device possesses ultra-high response of 110 and selectivity to ethanol. Particularly, it can effectively work in high humidity (RH = 80%) with super long-term stability of as long as 90 days, compared with the pristine In 2 O 3 sensor and previous reports. The presented novel In 2 (MoO 4) 3 @In 2 O 3 sensor offers great opportunities for future ethanol detection under harsh conditions. Image 1 • In 2 (MoO 4) 3) as an outstanding functional material has not been introduced in the MOSC sensors. • The peony shaped In 2 (MoO 4) 3 @In 2 O 3 nanocomposites were fabricated via the hydrothermal and the calcination routes. • The In 2 (MoO 4) 3 @2.5In 2 O 3 sensor possesses ultra-high response of 110 under 300 ppm and good selectivity to ethanol vapor. • The device can effectively work in high humidity (RH = 80%) with super long-term stability of as long as 90 days. [ABSTRACT FROM AUTHOR]