17:30 〜 17:45
▼ [10p-W323-14] Visible Light Induced Ferroelectric to Paraelectric Reversible Phase Transition in Polyvinylidene fluoride Based Nanocomposites
キーワード：Polymer nanocomposites, Phase transition, Raman spectroscopy
Polyvinylidene fluoride (PVDF) has received great attention as a semi-crystalline polymer with good mechanical flexibility and functionality. PVDF based nanocomposite materials have been used for various applications in ferroelectrics, dielectrics, energy harvesting, etc. In this work, we have observed a visible light-induced reversible ferroelectric phase transformation to paraelectric phase in PVDF-multiwalled carbon nanotubes (PVDF-CNTs) nanocomposites. The phase transformation was investigated using laser power dependent Micro-Raman Spectroscopy (533 nm and 632 nm lasers) to observe the structural changes (laser spot area of 12~15 µm2). The phase change also implies changes in the crystal structure and thereby, the dimensions of the domain (photostrictive nature) which is very vital in ferroelectric devices. This kind of dynamic optical control of ferroelectricity is highly desirable for Micro/Nanoelectromechanical systems and ferroelectric memories.