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InSb-added TiO2 nanocomposite films by RF sputtering.

¹Research Institute for Electromagnetic Materials, Sendai 982-0807, Japan. abe@denjiken.ne.jp.

Nanoscale Research Letters

|June 8, 2013

Summary

This study created InSb-added TiO2 nanocomposite films, shifting optical absorption to visible and near-infrared regions. The shift is due to quantum size effects in InSb nanocrystals within the oxide matrix.

Area of Science:

Materials Science
Nanotechnology
Solid State Physics

Background:

Titanium dioxide (TiO2) is a wide-gap semiconductor with applications in photocatalysis and electronics.
Indium antimonide (InSb) is a narrow-gap semiconductor known for its infrared optoelectronic properties.
Combining these materials into nanocomposites can lead to novel optical and electronic properties.

Purpose of the Study:

To prepare InSb-added TiO2 nanocomposite films using RF sputtering.
To investigate the structural and optical properties of the resulting nanocomposite films.
To understand the mechanism behind the observed optical absorption shifts.

Main Methods:

Radio Frequency (RF) sputtering technique for film deposition.
High-resolution transmission electron microscopy (HRTEM) for microstructure analysis.

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X-ray diffraction (XRD) for phase identification and structural characterization.

Optical absorption spectroscopy to determine spectral properties.

Main Results:

Successfully prepared InSb-added TiO2 nanocomposite films.
Observed significant shifts in optical absorption spectra towards visible and near-infrared regions.
HRTEM confirmed the dispersion of approximately 15 nm sphere-shaped InSb nanocrystals within the matrix.
XRD revealed a matrix composed of TiO2 and In2O3, formed from InSb decomposition during post-annealing at 723 K.

Conclusions:

The observed optical absorption shift is attributed to quantum size effects of the embedded InSb nanocrystals.
The formation of a TiO2/In2O3 matrix influences the electronic properties of the InSb nanocrystals.
These nanocomposite films show potential for applications requiring tailored optical absorption in the visible and NIR spectrum.