Room-temperature highly sensitive nitrogen dioxide sensor using zinc complex film

In this paper, a systematic study of the NO2 gas sensing properties of the sensors based on a [Zn3(bipyO2)4Cl4]Cl2 (bipyO2: 2,2′-bipyridine-N,N′-dioxide) complex film is presented for the first time. The sensors gave a good response to NO2 at room temperature. The response attained more than 1670 at high concentrations and a 15 V operating voltage. The responses to other test gases were poor. The influences of the operating voltage and the working temperature on the responses to NO2 gas were also studied. The optimum operating voltage of the sensor was 15 V. The sensor showed satisfactory reproducibility and stability in air. The gas-sensing mechanism of the sensor was discussed.