Gaikwad, Mayur M.
(2016)
Optimization of chemical parameters to develop lead-free
piezoelectric films for energy harvesting applications.
Masters thesis, Indian Institute of Technology Hyderabad.
Abstract
Piezoelectric material is one of the popular ways to harvest ambient mechanical energy in to electrical energy. The most widely used piezoelectric material is Lead Zirconate Titanate (PZT) as it possesses high electromechanical and piezoelectric properties
in numerous applications but it not eco-friendly. In search of the lead free piezoelectric material Sodium Bismuth Titanate (NBT)is one of the potential piezoelectric materials to give more piezoelectric constants compared to other lead-free materials.The present work is focused on to achieve pure stoichiometric Sodium Bismuth Titanate (NBT) phase in the film which is spin coated by NBT sol prepared by sol gel technique. The preparation of NBT sol and spin coating it on a substrate (platinized silica) involves many process parameters which affects the film thickness as well as its qualitative properties. Chemical parameters like rheology, pH & concentration of NBT sol change its viscosity which in turn changes the film properties. Spinning parameters like spin speed, spinning time and heating conditions also affects the final thickness of the film.
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