Document Detail


Nanocrystalline In2O3-based H2S sensors operable at low temperatures.
MedLine Citation:
PMID:  18585328     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Nanocrystalline In(2)O(3)-based solid solutions, with different concentration of Co, with cubic structure were successfully prepared by a simple route. The as-prepared materials were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The indirect heating structure sensors based on pure and doped In(2)O(3) as sensitive materials were fabricated on an alumna tube with Au electrodes and gas-sensing properties of the sensor elements were measured as a function of concentration of dopant, operating temperature and concentrations of the test gases. The results showed that In(2)O(3) had high response towards H(2)S gas at an operating temperature 150 degrees C, while 2.5 wt.% Co-doped In(2)O(3) sensor exhibited enhance response and selectivity to H(2)S at rather lower operating temperature. Incorporation of platinum further improved the response, selectivity and response time towards H(2)S. Platinum incorporated 2.5 wt.% Co-doped In(2)O(3) (Pt: 0.5 wt.%) was able to detect 10-100 ppm of H(2)S in air at an operating temperature of 100 degrees C. The selectivity of the sensor elements for H(2)S against liquefied petroleum gas (LPG), NH(3) and H(2) gases was studied. The improved gas-sensing properties can mainly be attributed to the selectivity to oxidation of H(2)S and noble metal additive sensitization.
Authors:
V D Kapse; S A Ghosh; G N Chaudhari; F C Raghuwanshi
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Publication Detail:
Type:  Evaluation Studies; Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-04-08
Journal Detail:
Title:  Talanta     Volume:  76     ISSN:  1873-3573     ISO Abbreviation:  Talanta     Publication Date:  2008 Jul 
Date Detail:
Created Date:  2008-06-30     Completed Date:  2008-08-13     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  2984816R     Medline TA:  Talanta     Country:  England    
Other Details:
Languages:  eng     Pagination:  610-6     Citation Subset:  IM    
Affiliation:
Department of Physics, Government Vidarbha Institute of Science & Humanities, Amravati 444604, India. vdk_research@yahoo.com
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MeSH Terms
Descriptor/Qualifier:
Cobalt
Cold Temperature*
Crystallization
Electrodes / standards*
Hydrogen Sulfide / analysis*
Indium / chemistry*
Nanoparticles / chemistry
Platinum
Temperature
Chemical
Reg. No./Substance:
1312-43-2/indium oxide; 7440-06-4/Platinum; 7440-48-4/Cobalt; 7440-74-6/Indium; 7783-06-4/Hydrogen Sulfide

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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