Facile Fabrication of MoS<sub>2</sub> Nanoflowers/SnO<sub>2</sub> Colloidal Quantum Dots Nanocomposite for Enhanced NO<sub>2</sub> Sensing at Room Temperature
Jingting Luo, Chong Li, Qutong Yang, Lanxin Yan, Baohui Zhang, Ran Tao, Sana Rauf, Honglang Li, Chen Fu
Abstract
With the continuous industrialization, as one of the most common air pollutants found in fossil fuels and automobile exhausts, nitride oxide (NO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> ) 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 <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> shows small gas sensing response for its less surface dangling bonds. Here, we introduce a facile method to modify MoS <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> with SnO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> as a NO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> receptor via mechanical composite. The MoS <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> nanoflowers prepared with a hydrothermal method depicted a high surface/volume ratio and the SnO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> 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 <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> for gas sensing. This work provides a facile alternative for fast and stable response NO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> gas sensor at room temperature.