Self-oriented β-crystalline phase in the polyvinylidene fluoride ferroelectric and piezo-sensitive ultrathin Langmuir-Schaefer film.
作者： Subrata Maji , Piyush Kanti Sarkar , Leena Aggarwal , Sujoy Kumar Ghosh , Dipankar Mandal
DOI: 10.1039/C5CP00218D
关键词:
摘要: 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. have pure β-phase just increasing number LS layers without using additional non-ferroelectric assisting agents. Edge-on oriented CH2–CF2 units PVDF at air–water interface enable self-orientation dipoles means hydrogen bonding network. Such restricted conformation results an increased net dipole moment with layers. The film's sensitivity are demonstrated hysteretic polarization loops butterfly-loops, respectively. Successful circular domain writing film, down to 5 monolayers PVDF, is demonstrated. achievement room temperature any agents may be promising for non-volatile memory piezoelectric-based, smart sensor devices.
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