UV-enhanced NO <sub>2</sub> sensor using ZnO quantum dots sensitized SnO <sub>2</sub> porous nanowires
Tianchen Jiang, Xin Liu, Jianbo Sun
Abstract
Abstract ZnO quantum dots sensitized SnO 2 porous nanowires were fabricated and designed for UV excitation gas sensor. The ZnO/SnO 2 composite (SZQ1%) with the molar proportion of 1:100 exhibits excellent sensing properties to NO 2 gas under UV irradiation at 40 °C. The limits of detection of the SZQ1% sensor is 100 ppb. The humidity stability of SZQ1% was also measured and discussed by DC reversed circuit and complex impedance curves. The gas sensing mechanism is well discussed and illustrated to the ZnO quantum dots sensitized and the increased photo-generated carriers under UV irradiation.
Topics & Concepts
Materials scienceQuantum dotNanowireIrradiationPorosityOptoelectronicsRelative humidityUltravioletNanotechnologyComposite materialPhysicsThermodynamicsNuclear physicsGas Sensing Nanomaterials and SensorsAnalytical Chemistry and SensorsZnO doping and properties