AVS 63rd International Symposium & Exhibition
    Advanced Surface Engineering Wednesday Sessions
       Session SE+2D+EM-WeA

Paper SE+2D+EM-WeA1
Investigation of H2S Poisoning Process on Composite Material Made of Metal Oxides and Carbon Nanotubes

Wednesday, November 9, 2016, 2:20 pm, Room 101D

Session: Multifunctional Thin Films and Coatings
Presenter: Yichen Duan, University of Delaware
Authors: Y. Duan, University of Delaware
A.V. Teplyakov, University of Delaware
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The composite material based on a combination of SnO2, CuO and acid-treated carbon nanotubes is considered to be promising for H2S sensing applications. By applying large dosage of H2S (1% in volume) to the composite and evaluating the chemical changes spectroscopically via XPS, SEM and EDS, the poisoning mechanism of this type of sensing material is revealed. Specifically, metal sulfides (CuS and SnS2), metal sulfate (Sn(SO4)2) and thiols are formed as the products following the introduction of H2S. In fact, all the three components of the material are affected by H2S. Moreover, when oxygen is present, metal sulfides can be reoxidized back into metal oxides while metal sulfate and thiols remain unchanged. The measurements of the model sensor response also support the assessment of the poisoning process.