Abstract
The powders of pure In2O3 and Eu3+, Gd3+, Ho3+-doped In2O3 with the structure of bixbyite-type were synthesized by a sol–gel method in the citric acid system. The structure and crystal phase of the powders were characterized by using an X-ray diffractometer. The gas sensing characteristics were obtained by measuring the response magnitude as a function of various controlling factors like dopant, operating temperature, concentrations of the test gases and the response time. The results showed that pure In2O3 had poor selectivity, while the In2O3 sensors doped with 5wt.% Eu2O3, 5wt.% Gd2O3, and 5wt.% Ho2O3 increased the gas-sensing performance towards H2S as a reducing gas, but decreased gas towards Cl2 as an oxidizing gas at 195°C. Namely, doping of the rare earth oxides remarkably improved the selectivity for H2S. In addition, it was found that among the dopants, 5wt.% Ho2O3 gave the highest the response value, selectivity, stability and the most excellent response and recovery characteristics to H2S at 195°C. Thus, the Ho2O3-doped In2O3 is a promising candidate for detection of H2S in environments.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.