Anshuman Srivastava

Title : Polymer/Ceramic composites a novel material for high K applications

Abstract:

Miniaturization of electronics devices creates a strong desire to place capacitors on the circuit board in the form of integrated passive components. To realize this, lot of research is being carried out by several researchers to develop polymer ceramic composites with high dielectric constant. Need for high dielectric constant materials have been driven by the continuous demand for miniaturization of electronic devices. To fulfil this material with high or giant dielectric constant is required. Recently, CaCu₃Ti₄O₁₂ (CCTO) has attracted lot of scientific and technological interest because of its giant dielectric constant (ε_r ~10⁴) with weak temperature/frequency dependence in a wide range of temperature (100–600 K) and frequency. High density, brittleness and challenging processing conditions are few drawbacks which impede its use as high-k materials. So polymer ceramic composites have become a promising material for these applications. As they possess hardness, stiffness and high dielectric constant of ceramics and the flexibility, elasticity and low density of polymers. In the present work, we investigated the structural and dielectric properties of Poly(vinylidene fluoride)/modified CCTO composites.

Extrusion process was used to prepare high dielectric constant ceramic reinforced PVDF composites. The structure and morphology of the composites were characterized using X-ray diffraction and scanning electron microscope. SEM micrographs show that homogeneous distribution of ceramics has taken place in PVDF matrix with small trails of agglomeration. Tensile tests were performed to measure Young’s modulus which increases significantly in composites in presence of ceramic filler. Dielectric measurements were carried out between frequencies 10^-2 to 10⁶ Hz using four probe Novocontrol set up (ZG4) from room temp to 120°C. With addition of CCTO there is substantial increase in the dielectric constant of matrix PVDF. Dielectric loss in composite slightly increases in presence of CCTO.

Audience take-away

• Audience may use the information for developing high dielectric constant thin film capacitors.
• Practical knowledge they will learn from the lecture like characterizations techniques, fabrications methods and types of testing, which will definitely help them in getting jobs, teaching and expanding their research. Presently I am supervising M.Tech and Ph.D thesis on different compositions, so collaborative research can also be done. They will learn embedded capacitor technology, which is latest in micro-electronics.

Biography:

Dr Anshuman Srivastava, obtained his Ph.D in the field of Material Science and Engineering from Indian Institute of Technology (BHU) Varanasi, India. He has worked as a Joint Director (R and D), IIP Mumbai, Government of India. He is having long industrial and academics experience. Presently, he is working as Head and Dean (R & D) in SIET Allahabad, India. He has published many research papers in journals like Composites Science and Technology, Journal of Power Sources, Material Research Bulletin, Journal of composites and many others.

He is a member of advisory, organizing and technical committees in many national and international conferences and has successfully organized several international and national conferences / workshops and FDPs. He is member of Editorial Board and Reviewer of various international/national journals. Presently he is guiding UG/PG and doctorial theses in mechanical / manufacturing /material science area. He is life member of various prestigious professional bodies like Electron Microscopy Society of India, International Association of Engineers (IAENG), IAENG Society of Industrial Engineering, IAENG Society of Mechanical Engineering, Material Research Society of India, Indian Society for Technical Education, Asian Polymer Association, Indian Society for Advancement in Material Processing and Engineering, Senior Member Hong Kong Society of Mechanical Engineers SM No 20170612001, Hong Kong Chemical, Biological & Environmental Engineering Society.

Research interest: His research work is focused on Physical, Dielectric and Mechanical properties of PVDF/CCTO and modified CCTO composites, Synthesis of high dielectric ceramics, Natural firbres reinforced Polymer composites, Bio composites, Metal matrix composites, Ceramics matrix composites, thermal engineering and manufacturing.