期刊
ACS SENSORS
卷 4, 期 4, 页码 822-826出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssensors.9b00150
关键词
gas sensor; nitrogen dioxide (NO2); high sensitivity; photo/light activation; micro light plate (mu LP); light emitting diode (LED); InGaN; ultra low power
资金
- European Research Council [336917]
- Lower Saxony Ministry for Science and Culture (N-MWK)
- EU Marie Curie Action COFUND [TECSPR15-1-0001]
- Serra Hunter Program
- DFG Project GrK NanoMet
- MINECO
- TecnioSpring fellowship programme of ACCIO, Government of Catalonia
- European Research Council (ERC) [336917] Funding Source: European Research Council (ERC)
A film of gas sensitive ZnO nanoparticles has been coupled with a low-power micro light plate (mu LP) to achieve a NO2-parts-per-billion conductometric gas sensor operating at room temperature. In this mu LP configuration, an InGaN-based LED (emitting at 455 nm) is integrated at a few hundred nanometers distance from the sensor material, leading to sensor photoactivation with well controlled, uniform, and high irradiance conditions, and very low electrical power needs. The response curves to different NO2 concentrations as a function of the irradiance displayed a bell-like shape. Responses of 20% to 25 ppb of NO2 were already observed at irradiances of 5 mWatts.cm(-2) (applying an electrical power as low as 30 mu W). In the optimum illumination conditions (around 60 mWatts.cm(-2), or 200 mu W of electric power), responses of 94% to 25 ppb were achieved, corresponding to a lower detection limit of 1 ppb of NO2. Higher irradiance values worsened the sensor response in the parts per-billion range of NO2 concentrations. The responses to other gases such as NH3, CO, and CH4 were much smaller, showing a certain selectivity toward NO2. The effects of humidity on the sensor response are also discussed.
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