A Novel Hierarchical Nickle Oxide Gas Sensor for Monitoring the Volatile Organic Compounds in Car Cabs

In this work, the novel NiO nanoflowers were synthesized by a hydrothermal method. Through X-ray diffraction and scanning electron microscopy, we can confirm that we have prepared high purity NiO and can observe that both nanoflowers are formed by self-assembly of thin nanosheets. Because of the novel morphology, sparsely NiO nanoflowers have a large specific surface area and form more enclosed micro-reaction chambers that make it difficult for gas to escape. Allowing gas molecules to be more widely distributed among the sparsely sample surface and obtained fully reaction time. Thus, the gas sensor based on compactly NiO nanoflowers exhibits excellent response and recovery characteristic.