Self-oriented β-crystalline phase in the polyvinylidene fluoride ferroelectric and piezo-sensitive ultrathin Langmuir–Schaefer film

Literature Information

Publication Date 2015-02-17
DOI 10.1039/C5CP00218D
Impact Factor 3.676
Authors

Subrata Maji, Piyush Kanti Sarkar, Leena Aggarwal, Sujoy Kumar Ghosh, Dipankar Mandal, Goutam Sheet, Somobrata Acharya


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Abstract

We report on the direct observation of ferroelectric switching and piezoelectric behaviour in ultrathin polyvinylidene fluoride (PVDF) films prepared by horizontal Langmuir–Schaefer (LS) technique. We have prepared pure β-phase by just increasing the number of LS layers without using additional non-ferroelectric assisting agents. Edge-on oriented CH2–CF2 units of PVDF at the air–water interface enable self-orientation of ferroelectric dipoles by means of the hydrogen bonding network. Such restricted conformation of PVDF at the air–water interface results in an increased net dipole moment with the number of LS layers. The film's ferroelectric switching and piezoelectric sensitivity are demonstrated by hysteretic polarization switching loops and butterfly-loops, respectively. Successful circular domain writing on ultrathin LS film, down to 5 monolayers of PVDF, is demonstrated. The achievement of pure β-phase of PVDF at room temperature without using any assisting agents may be promising for non-volatile memory and piezoelectric-based, ultrathin smart sensor devices.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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