XPS investigation of segregation of Sb in SnO₂ powders

Abstract

Antimony doped tin-oxide powders were prepared by controlled precipitation. Surface compositions were determined by X-ray photoelectron spectroscopy (XPS). The results indicate that enrichment of dopant at the surface of nanoparticles depends on total doping concentration and annealing temperature. Doped antimony shows the tendency to diffuse to surface when annealing at high temperatures. But same amount of Sb atoms are retained on the surface for powders annealing at different temperatures. The higher enrichment at higher temperature is caused by the decreasing of surface areas. Variation of the conductivities of SnO₂ powders is also discussed.

Keywords

tin-oxide / XPS / nanoparticles / surface segregation

References

[1] Berry F. J. Tin-antimony Oxide Catalysts[J]. Adv. Catal., 1981, 30: 97-102.

[2] Weng L. T., Delmon B. Phase Cooperation and Remote Control Effects in Selective Oxidation Catalysts[J]. Appl. Catal., 1992, A81: 141-147.

[3] Kim K. S., Yoon S., Lee W. J., . Surface Morphologies and Electrical Properties of Antimony Doped Tin Oxide Films Deposited by Plasma-enhanced Chemical Vapor Deposition[J]. Surface and Coating Technol., 2001, 138: 229-236.

[4] Shokr E. K. H. Optimization of the Electrical and Optical Properties of Sb-Sn-O Thin Films[J]. Semicond. Sci. Technol., 2000, 15: 247-253.

[5] Terrier C., Chatelon J. P., Roger J. A. Electrical and Optical Properties of Sb:SnO₂ Thin Film Obtained by the Sol-Gel Method[J]. Thin Solid Films, 1997, 295: 95-110.

[6] C A Vincent. The Nature of Semiconductivity in Polycrystalline Tin Oxide[J]. J. Electrochem. Soc., 1972, April:515–518

[7] Burgard D., Goebbert C., Nass R., . Synthesis of Nanocrystalline Redispersible Antimony-Doped SnO₂ Particles for the Preparation of Conductivity Transparent Coatings[J]. J. Sol-Gel Sci. and Tech., 1998, 13: 789-792.

[8] Beogeat D., Jousseaume B., Toupance T. The First Mixed Valence Fluolotin Alkoxides: New Slo-Gel Precurssors of Fluorinedoped Tin Oxide Materials[J]. Inorg. Chem., 2000, 39: 3 924-3 927.

[9] Franc C., Jousseaume B., Linker M. Thermally Induced Elimination Reactions in Xerogels Derived from (Fluoroorgano) Tin Compounds: A New Efficient Way to Prepare F-doped Tin Dioxid Materials[J]. Chem. Mater., 2000, 12: 3 100-3 107.

[10] Z M Jarzebski and J P Martin. Physical Properties of SnO₂ Materials Electrical Properties[J]. J. Electrochem. Soc.,1976 (7): 199C–205C

[11] Themlin J. M., Chtaib M., Henrard L., . Characterization of Tin Oxides by X-ray Photoemission Spectroscopy[J]. Phys. Rev., 1992, B46: 2 460-2 466.

[12] Cross Y. M., Pyke D. R. An X-ray Photoelectron Spectroscopy Study of the Surface Composition of Tin and Antimony Mixed Catalysts[J]. J. Catal., 1979, 58: 61-68.

[13] Boudeville Y., Figueras F., Forissier M., . Correlation between X-ray Photoelectron Spectroscopy Data and Catalytic Properties in Selective Oxidation on Sb-Sn-O Catalysts[J]. J. Catal., 1979, 58: 52-60.

[14] Szczuko D., Werner J., Oswald S., . XPS Investigation of Surface Segregation of Doping Elements in SnO₂[J]. Appl. Surf. Sci., 2001, 179: 301-306.

[15] Szczuko D., Werner J., Behr G., . Surface-related Investigation to Characterize Different Preparation Techniques of Sb-doped SnO₂ Powders[J]. Surf. Interface Anal., 2001, 31: 489-491.

[16] Dobler D., Oswald S., Werner J., . X-ray Photoelectron Spectroscopy Investigation of Segregation Process at Sb and In Doped SnO₂[J]. Chem. Phys., 2003, 286: 375-383.

[17] Terrier C., Chatelon J. P., Berjoan R., . Sb-doped SnO₂ Transparent Conducting Oxide from the Sol-Gel Dip-coating Technique[J]. Thin Solid Films, 1995, 263: 37-41.

[18] Sun K., Liu J., Browning N. D. Correlated Atomic Resolution Microscopy and Spectroscopy Studies of Sn(Sb)O₂ Nanophase Catalyst[J]. J. Catalysis, 2002, 205: 266-277.