Detection limit

Nanotechnology

Organic chemistry

Mathematics

Nickel

Indium

Nanocomposite

Composite number

Statistics

Engineering

Composite material

Chemistry

Metallurgy

Materials science

Formaldehyde

Tungsten trioxide

Tungsten disulfide

Tungsten

Chemical engineering

Optoelectronics

Doping

ACS Applied Materials & Interfaces

A high-performance formaldehyde sensor based on nickel (Ni)-doped indium trioxide (In2O3)/tungsten disulfide (WS2) nanocomposite was demonstrated. An epoxy substrate served as matrix of the Ni-In2O3/WS2 nanocomposite sensor. The material properties of self-assembled Ni-In2O3/WS2 nanoheterostructure were fully characterized and confirmed. The formaldehyde-sensing properties of the Ni-In2O3/WS2 composite were tested at 25 °C. Compared to the In2O3, WS2, and their composite, the Ni-In2O3/WS2 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-In2O3/WS2 film sensor can be attributed to the Ni ion doping and synergistic interfacial incorporation of In2O3/WS2 heterojunction. The sensitive mechanism of the Ni-In2O3/WS2 film sensor toward formaldehyde is explored through density functional theory (DFT) simulation. This work verified that the synthesis of Ni-doped In2O3/WS2 nanofilm provides a new avenue to develop promising hybrids for formaldehyde sensing.

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