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Fabrication and Optical Properties of Transparent P(VDF-TrFE) Ultrathin Films
Yong Liu1, Wei-Guo Liu1, Da-Bin Lin1
1Thin Film and Optical Manufacturing Technology, Key Laboratory of Ministry of Education, Xi'an Technological University, Xi'an 710032, China.
Nanomaterials (Basel, Switzerland)
|February 26, 2022
Summary
Multilayer films of vinylidene fluoride and trifluoroethylene (P(VDF-TrFE)) were fabricated using the Langmuir-Blodgett technique. These ultrathin P(VDF-TrFE) films exhibit controllable thickness and tunable optical properties for advanced applications.
Area of Science:
- Materials Science
- Polymer Science
- Thin Film Technology
Background:
- Poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) films are utilized in sensors, energy harvesters, and optical devices due to their electroactive and optical properties.
- Precise control over film thickness and morphology is crucial for optimizing device performance.
Purpose of the Study:
- To fabricate multilayer ultrathin P(VDF-TrFE) films using the Langmuir-Blodgett (LB) technique.
- To investigate the influence of fabrication parameters on film density and properties.
- To characterize the structural and optical properties of the resulting LB films.
Main Methods:
- Langmuir-Blodgett (LB) technique for multilayer film fabrication.
- Controlled compression at collapse pressure (60-70 mN/m) and optimal dipping value (15 mN/m).
- Characterization using X-ray diffraction, white light interferometry, and variable-angle spectroscopy ellipsometry.
Main Results:
- High-density P(VDF-TrFE) films were successfully fabricated with controllable layer thickness (average ~2.0-2.7 nm).
- Films demonstrated transparency in visible and IR regions, with high UV absorption.
- Transmittance in the visible range (50-85%) decreased linearly with the number of monolayers.
- Refractive index was calculated to be between 1.443 and 1.598 (600-650 nm).
Conclusions:
- The LB technique enables precise fabrication of multilayer P(VDF-TrFE) films with tunable properties.
- The optical properties, including transmittance and refractive index, can be controlled by adjusting film thickness.
- These ultrathin films show potential for applications in optical and electronic devices.
