Fabrication of Cubic p-n Heterojunction-Like NiO/In₂O₃ Composite Microparticles and Their Enhanced Gas Sensing Characteristics

Figure 4

The sensitivity of pure In₂O₃ and NiO/In₂O₃ materials prepared by hydrothermal reaction for 3.0 h and 24.0 h, respectively, to 600 ppm methanal gas.