论文部分内容阅读
采用溶液旋覆法制备β相 PVDF 铁电聚合物薄膜,利用 X 射线衍射仪、傅里叶红外光谱仪对薄膜晶形结构进行分析,并使用椭偏仪测定了溶液法制备的β相 PVDF 薄膜热光系数,同时对其热-光信号读出机制进行研究。结果表明,在60～120℃下结晶有利于β晶相的形成,而较高温度下主要形成γ晶相;薄膜的热光效应不仅与其热膨胀紧密相关,还受到温度变化趋势的影响,在20～100℃范围内,β相 PVDF 聚合物薄膜有较高的(负)热光系数约2.4～3.3×10~(-4)/K,升温条件下测得的热光系数更高;在探测波长633 nm 条件下,薄膜反射率变化可以线性地表征出薄膜温度的变化,基于薄膜热光效应的热-光信号读出机制是可行的。
The β-phase PVDF ferroelectric polymer thin films were prepared by solution spin-coating method. The crystal structure of thin films was analyzed by X-ray diffraction and Fourier transform infrared spectroscopy. The β-phase PVDF thin films prepared by solution method Coefficient, at the same time its thermal - optical signal readout mechanism. The results show that the crystallization at 60-120 ℃ is favorable for the formation of β crystal phase and the formation of γ crystal phase at higher temperature. The thermo-optic effect of the film is not only closely related to its thermal expansion but also affected by the temperature trend. Β-phase PVDF polymer film has a high (negative) thermal coefficient of about 2.4-3.3 × 10 -4 / K and a higher THP measured at elevated temperature in the range of -100 ~ The change of film reflectivity can characterize the change of film temperature linearly at 633 nm. The readout mechanism of thermo-optic signal based on the thermo-optic effect of film is feasible.