Facile Fabrication of MoS2 Nanoflowers/SnO2 Colloidal Quantum Dots Nanocomposite for Enhanced NO2 Sensing at Room Temperature

With the continuous industrialization, as one of the most common air pollutants found in fossil fuels and automobile exhausts, nitride oxide (NO2) monitor is very essential for ensuring good air quality and our body health. 2D materials attract more attention for its special surface and electron structures. MoS2 shows small gas sensing response for its less surface dangling bonds. Here, we introduce a facile method to modify MoS2 with SnO2 as a NO2 receptor via mechanical composite. The MoS2 nanoflowers prepared with a hydrothermal method depicted a high surface/volume ratio and the SnO2 fabricated using a solvothermal method. Mixing ratio and annealing temperature was systematic researched for screening optimal parameters for gas sensor fabrication. The response was enhanced 1.5 time after modification with fast response and recovery time. The p-n heterostructure also provide good selectivity towards NO2 for gas sensing. This work provides a facile alternative for fast and stable response NO2 gas sensor at room temperature.

Automated summary

In this study, MoS2 was modified with SnO2 as a NO2 receptor through mechanical composite. MoS2 nanoflowers with high surface/volume ratio were prepared using a hydrothermal method, and SnO2 was fabricated using a solvothermal method. The optimal parameters for gas sensor fabrication were systematically researched by investigating the mixing ratio and annealing temperature. The response was enhanced 1.5 times after modification, with fast response and recovery time. The p-n heterostructure also provided good selectivity towards NO2 for gas sensing. This work provides a facile alternative for fast and stable response NO2 gas sensor at room temperature.