کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7145572 | 1462071 | 2015 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Tin oxide-polyaniline heterostructure sensors for highly sensitive and selective detection of toxic gases at room temperature
ترجمه فارسی عنوان
سنسورهای هیستوپلاستی اکسید قلع برای شناسایی بسیار حساس و انتخابی گازهای سمی در دمای اتاق
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
چکیده انگلیسی
Nanocrystalline SnO2-Polyaniline (SnO2-PANI) heterostructure sensors have been developed for sensing trace amounts of toxic gases (2 ppm SO2 and 50 ppb NO2) at room temperature with high specificity. SnO2-PANI heterostructure has been prepared and the heterostructures have been optimized by electrochemical deposition of PANI of various thicknesses on nanocrystalline SnO2 (size â¼Â 15 nm) prepared by Langmuir-Blodgett technique. Two types of sensors: sensor #1 with in-plane gold contacts one each from SnO2 and PANI and sensor #2 with in-plane gold contacts from PANI film were prepared. Sensor #1 showed high specificity towards NO2 (50 ppb) gas with response and subsequent recovery at room temperature without any carrier gas flow or UV irradiation while sensor #2 showed high response and recovery towards SO2 (2 ppm). Furthermore, the sensor #1 showed a response time of about 5 min towards NO2 gas and recovery time of about 15 min at 25 °C. Space charge modulation occurring at various interfaces such as SnO2-PANI interface and boundaries between the SnO2 nanograins explains the high toxic gas sensitivity observed for the SnO2-PANI heterostructured thin film sensor.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Sensors and Actuators B: Chemical - Volume 220, 1 December 2015, Pages 288-294
Journal: Sensors and Actuators B: Chemical - Volume 220, 1 December 2015, Pages 288-294
نویسندگان
Chirayath Antony Betty, Sipra Choudhury, Shalav Arora,