Solid State Science and Technology, Vol. 15, No 1 (2007) 65-73

ISSN 0128-7389

Corresponding Author: zuhairii@hotmail.com

65

X-RAY PHOTOEMISSION SPECTROSCOPY (XPS) ANALYSIS ON

PLATINUM DOPED STANNIC OXIDE CERAMIC

 

Zuhairi Ibrahima, Zulkafli Othamana, Mohd Mustamam Abd Karimb and Diane Hollandc

aMaterial Science Unit, Department of Physics, Faculty of Science,

Universiti Teknologi Malaysia, 81310, Skudai, Johor, Malaysia.

bJabatan Fizik, Fakulti Sains dan Teknologi, Universiti Pendidikan Sultan Idris,

35900 Tanjong Malim, Perak.

cCentre for Advanced Materials Research, Physics Department,

University of Warwick, Coventry CV4 7AL

 

ABSTRACT

Pt-SnO2 ceramics were fabricated by the dry pressing method and sintered at 1000oC.

The XPS spectrum showed the Sn 4d, Sn 4p, Sn 4s, C 1s,Sn 3d5/2, Sn 3d3/2, O 1s, Sn

3p1/2 and Sn 3s peaks. The high resolution scan of revealed that the O 1s has a binding

energy of 530.2 eV which indicates that there were oxygen vacancies in the doped

material. The FWHM XPS spectrum was broader than the pure SnO2, which shows that

there is a greater range of chemical environments and hence binding energies. The

asymmetry in the O 1s also shows that adsorbed oxygen exists on the surface of the

sample in ambient atmosphere. The Sn 3d5/2 peak was symmetric and has a small

FWHM indicating that the compound has one component only. The atomic ratio of

oxygen and tin (ratio of O 1s and Sn 3d5/2) is ~ 1.30 :1, a deviation of stoichiometry

which was caused by oxygen deficiency on the surface region. The binding energies of

both the Sn 3d5/2 and Sn 3d3/2 shifted by 0.01 eV with respect to the pure SnO2 XPS

spectrum sintered at the same temperature (1000oC) and this is an indication that the

chemical environment was changing due to the incorporation of Pt in SnO2. The Pt(2)

which shows from the XPS spectrum was probably an oxide layer on the Pt metal or

possibly dissolved in the SnO2. The XPS analysis also showed that the Pt 4 f looks like

mainly Pt(0) or Pt metal.

 

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