TiO$_{2}$-Decorated MoS$_{2}$ Nanocomposite for CO$_{2}$ Sensing At Room Temperature

Continuous and real-time monitoring of carbon dioxide (CO$_{2}$) has become an urgent demand due to its significant impact on climate change, asphyxiation risks, agricultural productivity, and human health. Electrochemical sensors for CO$_{2}$ monitoring face challenges, such as slow response time, high operating temperature, and lack of selectivity. To overcome these challenges, we propose a highly selective room-temperature (RT) CO$_{2}$ detection sensor based on TiO$_{2}$-MoS$_{2}$ nanocomposite (NC), which is manufactured using a screen printing methodology. The fabricated sensor achieved a response of approximately 2.11% and response/recovery times of nearly 102/37s at 1000 ppm. The sensitivity is observed to be approximately 0.0032%/ppm with an excellent response for the CO$_{2}$ concentration range of 500–5000 ppm. Despite the typically low selectivity of unreactive CO$_{2}$ gas, the fabricated sensor exhibits high selectivity, with a response of around 2.21× higher than that of the CO gas with the next highest response. The scalable fabrication methodology and RT operation make TiO$_{2}$-MoS$_{2}$ sensor a highly viable candidate for production through a cost-effective and high performance CO$_{2}$ sensing.