Fabrication of 2D/2D Bi2MoO6/Ti3C2Tx heterostructure for room-temperature and humidity-resistant NH3 gas sensor

Ammonia (NH 3 ) is a toxic and pungent gas with significant implications for environmental monitoring, industrial safety, and human health. Therefore, the development of high-performance sensors for NH 3 detection at room temperature is of great necessity. This work develops a Bi 2 MoO 6 /Ti 3 C 2 T x 2D/2D heterostructure-based NH 3 gas sensor. The material demonstrated outstanding NH 3 sensing characteristics, involving high sensitivity (R a /R g =25.6 at 100 ppm), quick response time (21 s), and quick recovery time (72 s) at room temperature. Meanwhile, the sensor demonstrated prominent stability, repeatability, humidity-resistant, and an optimal operating temperature for NH 3 detection. Density functional theory (DFT) simulations were applied to examine the adsorption behavior of NH 3 on the Bi 2 MoO 6 /Ti 3 C 2 T X surface, which shed light on the sensing process. Additionally, a prototype detection system was developed to monitor NH 3 emissions from spoiled fish samples, illustrating how this sensor could be applied to monitor food safety.