Flame-Spray-Made Undoped Zinc Oxide Films for Gas Sensing Applications

Sensors

关键词: undoped ZnO;    flame spray pyrolysis;    NO2;    C2H5OH;    SO2;    gas sensor;   

DOI  :  10.3390/s100807863

来源: DOAJ

【 摘 要 】

Using zinc naphthenate dissolved in xylene as a precursor undoped ZnO nanopowders were synthesized by the flame spray pyrolysis technique. The average diameter and length of ZnO spherical and hexagonal particles were in the range of 5 to 20 nm, while ZnO nanorods were found to be 5–20 nm wide and 20–40 nm long, under 5/5 (precursor/oxygen) flame conditions. The gas sensitivity of the undoped ZnO nanopowders towards 50 ppm of NO2, C2H5OH and SO2 were found to be 33, 7 and 3, respectively. The sensors showed a great selectivity towards NO2 at high working temperature (at 300 °C), while small resistance variations were observed for C2H5OH and SO2, respectively.

【 授权许可】

Unknown