AVS 60th International Symposium and Exhibition
    Accelerating Materials Discovery for Global Competitiveness Focus Topic Friday Sessions
       Session MG+AS+EM+NS+SA+SE+SP+SS+TF-FrM

Paper MG+AS+EM+NS+SA+SE+SP+SS+TF-FrM1
MWCT and Piezoelectric Thick Film Composites that Incorporate Graphene Electrodes

Friday, November 1, 2013, 8:20 am, Room 202 B

Session: Novel Synthesis Approaches and Innovative Characterization Techniques Coupled with Theory & Computations
Presenter: K. Cook-Chennault, Rutgers University
Authors: K. Cook-Chennault, Rutgers University
S. Banerjee, Rutgers University
R. Kappera, Rutgers University
M. Chhowalla, Rutgers University
Correspondent: Click to Email
Three-phase, PZT-Epoxy- Multi-walled Carbon-Nanotube (MWCNT) flexible thick films prepared by a combination of solvent and spin coating technique were prepared, where materials were spin coated onto flexible substrates. The substrates investigated included; stainless steel, graphene and graphene with PMMA. Graphene and graphene/PMMA films which were grown by a chemical vapor deposition process, and the film thicknesses were ~ 200 µm. The volume fraction of the MWCNTs was varied from 1% to 6%, while the PZT volume fraction was held constant at 30% . The strain coefficient and capacitance were measured as a function of the MWCNT volume fraction and used to determine the effective dielectric constant. Samples that incorporated graphene electrodes rendered higher dielectric properties in comparison to samples with graphene-PMMA. The maximum values of dielectric constant were ~ 4353, ~1945 and ~ 61, for samples with graphene, graphene/PMMA and no electrode respectively. Sample surface morphology and sample composition were observed using SEM and measured using Raman Spectroscopy respectively. Improved dielectric properties observed for samples with graphene coatings are due to graphene’s high carrier mobility and its ability to readily conform to the surface of the sample.