Influence of Applied Electric Field on Crystalline Structure and Thermo-optical Effect of Oriented PVDF Thin Films
(0) The α phase oriented PVDF thin films were deposited using vacuum evaporation technology with a DC electric field applied on substrate holder during deposition process. X-ray Diffraction was used to examine the structural variations as a function of applied electric fields. DSC data allowed measurement of the melting temperatures and enthalpies of the PVDF granules and films deposited at various bias voltages, providing information on the changes in the crystallinity of the films. The thermo-optical (t. O) coefficient of α phase oriented PVDF thin films with different degree of crystallinity, which obtained by regulating the applied electric voltages varying from 0 to 5KV, were determined by using spectroscopic ellipsometer (SE) equipped with a heating stage. At temperatures ranging from 20 to 100℃, the refractive index of all the PVDF films was negatively correlated with the temperature between 600 and 1600nm. The value of the t. O coefficient of PVDF films was calculated at all temperatures. During the deposition process, a decrease in the degree of crystallinity was observed with the increase of applied electric voltage. Furthermore, the absolute value of t. O. coefficient for film deposited at 5kV was slightly higher and decreased with increase in the degree of its crystallinity.
LIU Wei-guo XI Ying-xue FAN Hui-qing YANG Chen NIU Xiao-ling
Shaanxi Province Thin Film Technology and Optical Test Open Key Laboratory,School of Optoelectronic State Key Laboratory of Solidification Processing,School of Materials Science and Engineering,Northw
国际会议
西安
英文
405-410
2009-08-23（万方平台首次上网日期，不代表论文的发表时间）