1. Effect of Particle Size on Band Gap and DC Electrical Conductivity of TiO2 Nanomaterial.
- Author
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Avinash, B. S., Chaturmukha, V. S., Jayanna, H. S., Naveen, C. S., Rajeeva, M. P., Harish, B. M., Suresh, S., and Lamani, Ashok R.
- Subjects
PARTICLE size determination ,BAND gaps ,ELECTRIC conductivity ,NANOSTRUCTURED materials ,HYDROLYSIS - Abstract
Materials reduced to the Nano scale can exhibit different properties compared to what they exhibit on a micro scale, enabling unique applications. When TiO
2 is reduced to Nano scale it shows unique properties, of which the electrical aspect is highly important. This paper presents increase in the energy gap and decrease in conductivity with decrease in particle size of pure Nano TiO2 synthesized by hydrolysis and peptization of titanium isopropoxide. Aqueous solution with various pH and peptizing the resultant suspension will form Nano TiO2 at different particle sizes. As the pH of the solution is made acidic reduction in the particle size is observed. And it is confirmed from XRD using Scherer formula and SEM, as prepared samples are studied for UV absorbance, and DC conductivity from room temperature to 400°C. From the tauc plot it was observed, and calculated the energy band gap increases as the particle size decreases and shown TiO2 is direct band gap. From Arrhenius plot clearly we encountered, decrease in the conductivity for the decrease in particle size due to hopping of charge carriers and it is evident that, we can tailor the band gap by varying particle size. [ABSTRACT FROM AUTHOR]- Published
- 2016
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