Nanoheterostructure Construction and DFT Study of Ni-Doped In2O3 Nanocubes/WS2 Hexagon Nanosheets for Formaldehyde Sensing at Room Temperature

作者：Dongzhi Zhang, Yuhua Cao, Zhimin Yang, Junfeng Wu · 发表于：ACS Applied Materials & Interfaces · 年份：2020 · DOI：10.1021/acsami.9b15200 · 被引用次数：215 · 研究领域：Gas Sensing Nanomaterials and Sensors、Advanced Chemical Sensor Technologies、Analytical Chemistry and Sensors

A high-performance formaldehyde sensor based on nickel (Ni)-doped indium trioxide (In 2 O 3 )/tungsten disulfide (WS 2 ) nanocomposite was demonstrated. An epoxy substrate served as matrix of the Ni–In 2 O 3 /WS 2 nanocomposite sensor. The material properties of self-assembled Ni–In 2 O 3 /WS 2 nanoheterostructure were fully characterized and confirmed. The formaldehyde-sensing properties of the Ni–In 2 O 3 /WS 2 composite were tested at 25 °C. Compared to the In 2 O 3, WS 2, and their composite, the Ni–In 2 O 3 /WS 2 sensor demonstrated significant improvement on the formaldehyde-sensing performance, including a low detection limit of 15 ppb, good selectivity, repeatability, fast detection rate, and a fair logarithmic function toward formaldehyde concentration. The dramatically enhanced sensing performance of Ni–In 2 O 3 /WS 2 film sensor can be attributed to the Ni ion doping and synergistic interfacial incorporation of In 2 O 3 /WS 2 heterojunction. The sensitive mechanism of the Ni–In 2 O 3 /WS 2 film sensor toward formaldehyde is explored through density functional theory (DFT) simulation. This work verified that the synthesis of Ni-doped In 2 O 3 /WS 2 nanofilm provides a new avenue to develop promising hybrids for formaldehyde sensing.