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Vol. 12, Special Issue, October 2011, pp.11-17

 

Bullet

 

Distributed Array of Polymeric Piezo-nanowires through Hard-Templating Method into Porous Alumina

 

1Valentina CAUDA, 1Davide DAPRA, 1Ilze AULIKA, 1Angelica CHIODONI, 2Danilo DEMARCHI, 2Pierluigi CIVERA, 1Marco PIZZI

1 Center for Space Human Robotics @PoliTO, Italian Institute of Technology, Corso Trento 21, 10129, Turin, Italy

2 Electronics Department, Politecnico di Torino,

Corso Duca degli Abruzzi 24, 10129, Turin, Italy

E-mail: valentina.cauda@iit.it

 

 

Received: 15 June 2011   /Accepted: 18 July 2011   /Published: 31 October 2011

Handbook of Laboaratory Measurements book

 

Abstract: We report on the preparation of ferroelectric polymeric nanowires through hard-templating strategy. Wet-impregnation of poly(vinylidene fluoride) (PVDF) and its copolymer poly(vinylidene fluoride-tri fluoro ethylene) [P(VDF TrFE)] was performed into commercially available porous Anodic Alumina Membrane (AAM). The polymeric nanowires show a diameter ranging from 144 to 166 nm, a length of tenth of micron and a high filling ratio of the alumina pores. X-ray diffraction pattern and infrared spectroscopy show the crystallization of both polymers into the ferroelectric β phase. In addition, Curie temperature (Tc) tests show an increase to higher Tc for the PVDF-TrFE polymeric nanowires with respect to the bulk polymeric material, thus revealing the importance of confined crystallization into mono-dimensional structures. A piezoelectric behavior was also observed by a voltage generation upon mechanical pressure, without pre-poling or mechanically orienting the polymer. These crystalline piezoelectric nanowires distributed in a vertical array would potentially address applications like mechanical pressure sensors, e.g., in robotics.

 

Keywords: Piezoelectric polymeric nanowires, Confined crystallization, Hard-templating, Anodic porous alumina membrane, Dielectrical properties

 

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