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Development of a 3D Graphene Electrode Dielectrophoretic Device
Published on: June 22, 2014
Functionalised graphene sheets as effective high dielectric constant fillers
Laura J Romasanta1, Marianella Hernández, Miguel A López-Manchado
1Instituto de Ciencia y Tecnología de Polímeros, ICTP-CSIC, Juan de la Cierva 3, 28006, Madrid, Spain. rverdejo@ictp.csic.es.
Nanoscale Research Letters
|August 27, 2011
Summary
A novel functionalized graphene sheet (FGS) nanocomposite offers a tenfold increase in dielectric permittivity for flexible electronics. This material maintains low dielectric loss and good mechanical properties, ideal for advanced applications.
Area of Science:
- Materials Science
- Polymer Science
- Nanotechnology
Background:
- Developing advanced dielectric materials is crucial for the advancement of flexible electronics.
- Poly(dimethyl)siloxane (PDMS) is a versatile polymer but often requires enhancement for high-performance dielectric applications.
- Graphene-based nanocomposites offer promising routes to improve polymer dielectric properties.
Purpose of the Study:
- To develop a new functionalized graphene sheet (FGS) filled poly(dimethyl)siloxane (PDMS) nanocomposite.
- To investigate the dielectric properties of the FGS-PDMS nanocomposite, particularly its dielectric constant and loss.
- To assess the impact of functionalized graphene on nanofiller/polymer compatibility and interfacial polarization.
Main Methods:
- Synthesis of functionalized graphene sheets (FGS).
- Fabrication of FGS-filled PDMS nanocomposites at varying FGS concentrations (e.g., 2 wt.%).
- Characterization of dielectric properties (dielectric permittivity, dielectric loss) at low frequencies (e.g., 10 Hz).
- Evaluation of mechanical properties and interfacial compatibility.
Main Results:
- A tenfold increase in dielectric permittivity was observed at 10 Hz with 2 wt.% FGS loading.
- The nanocomposite exhibited low dielectric losses, indicating efficient energy storage.
- Functional groups on FGS improved nanofiller/polymer compatibility, reducing interfacial polarization.
- Good mechanical properties were maintained in the developed nanocomposite.
Conclusions:
- Functionalized graphene sheets (FGS) are effective nanofillers for creating high-dielectric constant polymer composites.
- The FGS-PDMS nanocomposite demonstrates significant potential for applications in flexible electronics.
- Surface functionalization of graphene is key to enhancing interfacial interactions and optimizing dielectric performance.
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