Fig. 4From: Gas-Sensing Devices Based on Zn-Doped NiO Two-Dimensional Grainy Films with Fast Response and Recovery for Ammonia Molecule DetectionTEM and HRTEM analysis of Zn-doped NiO film. a Low-magnification and b high-magnification SEM images of sample demonstrating Zn-doped NiO film is composed of NiO particles. c, d HRTEM images recorded from two different areas of sampleBack to article page