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 (NO
₂
) 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. MoS
₂
shows small gas sensing response for its less surface dangling bonds. Here, we introduce a facile method to modify MoS
₂
with SnO
₂
as a NO
₂
receptor via mechanical composite. The MoS
₂
nanoflowers prepared with a hydrothermal method depicted a high surface/volume ratio and the SnO
₂
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 NO
₂
for gas sensing. This work provides a facile alternative for fast and stable response NO
₂
gas sensor at room temperature.