Low Temperature Part Per Billion H2S Sensor Based on P-N CuO-WO3 Heterostructured Microflowers.

Hydrogen sulfide (H2S) is a common environmental pollutant and a biomarker for gas detection in a variety of diseases. The development of a fast and low parts per billion level H2S gas sensor is of great significance for environmental monitoring and the development of smart medical treatment. In this study, CuO composite WO3 nanofloral materials were synthesized by the hydrothermal method, and p-n heterostructures were successfully constructed. The gas-sensitive performance test results show that the response value of 20 wt % CuO/WO3 sensor to 10 ppm of H2S gas at 60 °C is as high as 3511.1, the response time is only 4 s, and the detection limit is as low as 1 ppb. In addition, it also has the characteristics of a wide detection range, good linearity, and good selectivity. The nanoflower structure of the multigas dispersion channel, the construction of p-n heterojunction, and the sulfurization effect of H2S on CuO enable the sensor to detect H2S at the ppb level at low temperature.