(Au, Ag, Ti)-SiO2 Core-Shell Nanoparticles Based Polymer Nanodielectrics for Energy Storage Applications

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This paper addresses materials and processes for energy storage in high k embedded capacitors using metal nanoparticles coated and uncoated SiO2 shells (M@SiO2, where M = Au, Ag, and Ti)) and high K polymer matrices for stabilization. We present three approaches to fabricating nanodielectrics using nano-fillers. The first approach is based on our previous work of polymer embedded gold nanoparticles (Au-NP) coated with primary polymer like polystyrene. This work has been carried out in our laboratory and results have been compared with closely related published work. The second approach in which we are using the more cost effective method based on metal core-SiO2 shells core embedded in polymers to create high K polymer films for fabricating capacitors. The third and most effective method we will talk about is the self-assembly of high k dielectric nanoparticles to produce nanostructured films with improved performance in terms of dielectric tunability, low leakage, and low loss while at the same time maintaining the requirement of size, composition and structure. A modified Stober method was used in the sol-gel fabrication process, to make silica spheres (SiO2) containing metal nanoparticles stabilized with an amphiphilic, nonionic polymer such as polyvinylpyrrolidone (PVP) or related polymers. These experiments were performed using silver nanoparticles coated with amorphous silica to form spherical colloids with a core-shell structure.The nanocomposites made through these processes are subjected to full characterization for dielectric constant (k), dielectric loss and dielectric strength including thickness parameters by Ellipsometry experiments. Further characterization is made through TEM/SEM morphology experiments and I-V data acquisition. A comparison of the data obtained with our current method was made with core-shell nanoparticles embedded polymer matrix materials generated in-house by laser ablation techniques in our laboratory. We will also discuss recent experiments which revealed intriguing dielectric properties of nanocomposites and are most relevant for the development of high-K capacitors for energy storage applications. The results and methods presented in this talk further support our ongoing efforts to develop cost effective materials and fabrication methods to mass produce high energy storage capacitors using state-of-the-art nanocomposites “Nanodielectrics” material. Success in our efforts on energy storage high k capacitors will have broader impact in industries such as in power storage, power back-up in electronics, load leveling, in automotive and various aerospace and military system

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Journal: TechConnect Briefs
Volume: 1, Nanotechnology 2011: Advanced Materials, CNTs, Particles, Films and Composites
Published: June 13, 2011
Pages: 726 - 729
Industry sectors: Advanced Materials & Manufacturing | Energy & Sustainability
Topic: Energy Storage
ISBN: 978-1-4398-7142-3