H2S-sensing properties of SnO2 produced by ball milling and different chemical reactions |
| |
| Authors: | Ülo Kersen Lauri Holappa |
| |
| Institution: | a Department of Electrical and Communications Engineering, Laboratory of Electromechanics, Helsinki University of Technology, Otakaari 5 A, Fin-02015 HUT, Finland
b Department of Materials Science and Engineering, Laboratory of Metallurgy, Helsinki University of Technology, Vuorimiehentie 2K, Fin-02015 HUT, Finland |
| |
| Abstract: | In this work, the mechanochemical synthesis of a moderately agglomerated tin oxide (SnO2) powders and the subsequent preparation of semiconductor gas sensors as prototypes, were studied. Tin (II) chloride (SnCl2) powder was milled with calcium hydroxide (Ca(OH)2) and potassium carbonate, (K2CO3) powder, respectively, in a ball mill at room temperature and in an air atmosphere. Heat treatment of milled mixtures at 400 °C resulted in the formation of a tetragonal phase, confirmed by X-ray diffraction (XRD). During milling in the presence of water, a high number of hydroxide (OH) groups are formed at the surface. When SnCl2 was milled with K2CO3, no water was produced and the Fourier-transform infrared spectrum (FT-IR) of the powder has no surface hydroxyl deformations. On exposure to hydrogen sulfide (H2S) gas, the particles, prepared from anhydrous powder, have higher sensitivity than these, prepared from hydrated powder. The SnO2 thick film, prepared from anhydrous powder may be successfully applied to a H2S gas sensor. |
| |
| Keywords: | Mechanochemical synthesis SnO2 powder X-ray diffraction (XRD) Fourier transform infrared (FT-IR) SnO2 thick film H2S gas response |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
