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Electric and morphologic properties of SnO2 films prepared by modified sol–gel process

2003; Elsevier BV; Volume: 57; Issue: 28 Linguagem: Inglês

10.1016/s0167-577x(03)00328-8

1873-4979

Marcelo Antônio Dal Santos, Augusto Celso Antunes, Cauê Ribeiro, Christiane Philippini Ferreira Borges, Sandra Regina Masetto Antunes, A. J. Zara, S. A. Pianaro,

Analytical Chemistry and Sensors

Abstract Tin dioxide (SnO 2 ) is used in several technological applications such as sensors, catalysts, and electro-optical equipments. Many of these applications involve the use of SnO 2 in the form of ceramic thin film. The preparation of SnO 2 films has been widely studied and different methods have been proposed to synthesize pure or doped SnO 2 . In this work, SnO 2 films produced by the modified sol–gel method, using tin tartrate as a precursor, are presented. The sol stability was verified using UV–visible spectroscopy. The obtained films were characterized by X-ray diffraction (XRD), optical microscopy, electrical measurements, scanning electron microscopy (SEM), and X-ray fluorescence (FRX). The obtained films presented a thickness of 0.3 μm and an amorphous structure. The sensor electrical sensibility at 300 °C in the presence of LPG was clearly shown.