کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
745647 894426 2011 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Temperature dependent H2S and Cl2 sensing selectivity of Cr2O3 thin films
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Temperature dependent H2S and Cl2 sensing selectivity of Cr2O3 thin films
چکیده انگلیسی

The conductometric gas sensing characteristics of Cr2O3 thin films – prepared by electron-beam deposition of Cr films on quartz substrate followed by oxygen annealing – have been investigated for a host of gases (CH4, CO, NO2, Cl2, NH3 and H2S) as a function of operating temperature (between 30 and 300 °C) and gas concentration (1–30 ppm). We demonstrate that these films are highly selective to H2S at an operating temperature of 100 °C, while at 220 °C the films become selective to Cl2. This result has been explained on the basis of depletion of chemisorbed oxygen from the surface of films due to temperature and/or interaction with Cl2/H2S, which is supported experimentally by carrying out the work function measurements using Kelvin probe method. The temperature dependent selectivity of Cr2O3 thin films provides a flexibility to use same film for the sensing of Cl2 as well as H2S.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Sensors and Actuators B: Chemical - Volume 157, Issue 2, 20 October 2011, Pages 466–472
نویسندگان
, , , , , , , , , ,