کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5009793 | 1462045 | 2017 | 23 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Improved selectivity of SnO2:C alloy nanoparticles towards H2 and ethanol reducing gases; role of SnO2:C electronic interaction
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
In the present study, changes in the sensing properties of SnO2 on Carbon incorporation have been investigated in detail. The gas sensing response of size-selected SnO2 and SnO2:C alloy nanoparticles prepared by gas phase deposition method have been investigated for H2 and ethanol over a varied temperature range (50 °C-200 °C). The incorporation of carbon into SnO2 lattice results in a large change in the sensing behaviour towards the two gases both having reducing nature. SnO2:C nanoparticles show positive sensing response for H2 and negative sensing response for ethanol, whereas SnO2 nanoparticles show a normal sensing response of an n-type semiconductor towards both the reducing gases. Observed values of activation energy of sensing and energy levels of O-vacancies observed in the PL spectra of SnO2 and SnO2:C are consistent with these results. (i) Catalytic C-H interaction and (ii) modified work function of SnO2 and C on hydrogenation resulting in alteration of electronic exchange between SnO2 and C, and (iii) passivation effect of carbon during SnO2-ethanol interaction along with a possibility of reduction in SnO2 sites in SnO2:C nanoparticles, are responsible for the observed behaviour. The present study shows that the incorporation of C in SnO2 nanoparticles results in excellent selectivity towards H2 and ethanol (both having reducing nature) in the low temperature range, normally not observed in oxide based resistive sensors.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Sensors and Actuators B: Chemical - Volume 246, July 2017, Pages 336-343
Journal: Sensors and Actuators B: Chemical - Volume 246, July 2017, Pages 336-343
نویسندگان
Mehar Bhatnagar, Shivani Dhall, Vishakha Kaushik, Akshey Kaushal, Bodh Raj Mehta,