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Elecroceramic -polymer composites for sensor applications

Results. Applications in sensors. Pyroelectric ceramics. Conclusions. SEM images. Objective. Dielectrophoresis. Fabrication of composites. Elecroceramic -polymer composites for sensor applications. PhD Candidate: Hamideh Khanbareh Department : ASM Section: NovAM

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Elecroceramic -polymer composites for sensor applications

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  1. Results Applications in sensors Pyroelectric ceramics Conclusions SEM images Objective Dielectrophoresis Fabrication of composites Elecroceramic-polymer composites for sensor applications PhD Candidate: Hamideh Khanbareh Department: ASM Section: NovAM Supervisor: P. Groen and S. van der Zwaag Promoter: S. van der Zwaag Start date: 1-1-2012 Funding: M2I Cooperations: TNO Epoxy resin Ceramic powder Hardener Electroding Exploring the method of making oriented ceramic-polymer composites by dielectrophoresis for the class of pyroelectric materials and investigating the pyroelectric properties is the main aim of the current work. Pyroelectricity is the ability of material to generate voltage upon a change in temperature. The materials are based on lead titanate (PT) perovskite ceramics with low dielectric constant compared to PZT. The pyroelectric figure of merit (FOM) is proportional to the pyroelectric coefficient, p(T), and inversely proportional to the relative dielectric permittivity. Aerospace Engineering 20 vol.% ceramic 10 vol.% ceramic 30 vol.% ceramic Random Structured PT-epoxy composites PZT ceramics Light-weight and flexible Highest sensitivity Piezo voltage constant (mVm/N) Dielectric constant vs temperature Pyroelectric coefficient vs temperature Ceramic vol. % Significant improvement in piezoelectric properties of composites is achieved by dielectrophoretic alignment of the particles inside the polymer matrix, especially at low volume fractions which leads to higher flexibility of the composites.

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