کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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751069 | 895188 | 2011 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Growth and gas sensing characteristics of p- and n-type ZnO nanostructures Growth and gas sensing characteristics of p- and n-type ZnO nanostructures](/preview/png/751069.png)
ZnO nanoparticles (NPs) of 5–15 nm size and nanowires (NWs) of 50–100 nm dia., exhibiting p and n-type characteristics, respectively, have been synthesized using simple chemical process. ZnO NW-films exhibited good sensitivity and selectivity towards H2S in ppm range with fast response and recovery times. Interestingly, ZnO NP-films showed p-type conductivity that has been obtained for the first time without intentional doping while NW-films showed n-type conduction as has also been reported in various earlier studies. The p- and n-type conductivities in NP- and NW-films have been confirmed using hot probe and Kelvin probe measurements. The n-type behavior of NW-films is attributed to oxygen vacancies, whereas the p-type nature of NP-films is attributed to the zinc vacancy, surface acceptor levels created by the adsorbed oxygen and/or the unintentional carbon doping in ZnO.
Journal: Sensors and Actuators B: Chemical - Volume 156, Issue 2, August 2011, Pages 875–880