Title: An effective method approach to extend the charge stability of the PDMS ferroelectrets
Abstract: Compared with traditional piezoelectric materials, ferroelectret materials have several advantages: higher piezoelectric coefficient, lower production cost and environmental friendly. However, The piezoelectric coefficient of existing PDMS ferroelctrets present a downward trend with time (usually drop very fast in several days after charging), which is seriously limited its applications. Therefore a surface deposition of PTFE is used and present a positive result.