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Electrical and Optical Properties of Gold-strontium Titanate Nano-composite Thin Films

Published online by Cambridge University Press:  01 February 2011

S Ganti ,
Y Dhopade ,
R K Gupta ,
K Ghosh  and
P K Kahol
S Ganti
Affiliation:
ganti123@missouristate.edu, Missouri State University, Physics, Astronomy, & Materials Science, Springfield, Missouri, United States
Y Dhopade
Affiliation:
Yogini963@missouristate.edu, Missouri State University, Physics, Astronomy, & Materials Science, Springfield, Missouri, United States
R K Gupta
Affiliation:
ramgupta@missouristate.edu, United States
K Ghosh
Affiliation:
KartikGhosh@missouristate.edu, Missouri State University, Physics, Astronomy, & Materials Science, Springfield, Missouri, United States
P K Kahol
Affiliation:
PawanKahol@missouristate.edu, United States
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Abstract

Thin films based on nano-composites have attracted considerable attention for their possible applications in devices and sensors. These nano-composite thin films are formed by embedding metal or semiconductor nano-particles in a host material and they exhibit interesting electrical transport properties. Using pulsed laser deposition technique, we have prepared nano-composite thin films of gold-strontium titanate on quartz substrate. Gold and strontium titanate were used as targets for pulsed laser deposition. Thin films having different compositions were grown. The effect of different composition on their electrical and optical properties has been studied in details. The structural characterizations of the films were done by x-ray diffraction, transmission electron microscopy, scanning electron microscopy, and atomic force microscopy. Transmission electron microscopy as well as atomic force microscopy shows the presence of gold nano-particles in these films. X-ray diffraction and energy dispersive x-ray spectroscopy shows the existence of strontium titanate and gold. Current-voltage characteristics and temperature dependent resistivity measurements were made to characterize electrical properties of these films. Electrical properties can be manipulated from metal to insulator through semiconductor by varying the composition. In addition, it is observed that the absorption of visible light increases with increase in gold percentage. This indicates that these nano-composites could also use as active materials for many electronic as well as optical sensors.

Keywords

Aucompositeelectrical properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1129: Symposium V – Materials and Devices for Smart Systems III , 2008 , 1129-V11-14
Copyright
Copyright © Materials Research Society 2009

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