The coupling of high frequency electromagnetic radiation (light) with low-frequency functionalities of dielectrics and liquid crystals is a long-standing problem of fundamental and applied science. An ability to turn “on” and “off” the pyro-, piezo-, or ferro-electric properties of materials on demand by optical means leads to fascinating device applications and is central to modern photostriction, where material strain is generated by light. In this work, we report on the interesting finding of the light intensity induced phase transitions observed in 0.05 % weight GO doped piezoelectric PVDF films with 100 µm thicknesses. Two effects were discovered in the Raman studies with wavelength of incident beam 532 nm: (i) an alternated modulation of integrated intensities of 797 and 840 cm<sup>-1</sup> as a function of time, where wavenumbers stand for vibration modes of CH<sub>2</sub> rocking of α non-piezoelectric and β piezoelectric phases, respectively and (ii) reversible switching between α and β phases depending on the light intensity (power within the range of 10 – 40 mW). We provide a hypothesis on the mechanism and origin of observed effects within the framework of pyroelectricity of GO doped PVDF.&lt;div id="UMS_TOOLTIP" style="position: absolute; cursor: pointer; z-index: 2147483647; background-color: transparent; top: -100000px; left: -100000px; background-position: initial initial; background-repeat: initial initial;"&gt; &lt;/div&gt;

Light intensity induced phase transitions in graphene oxide doped polyvinylidene fluoride

255th National Meeting (2018)

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