Gold Nanoparticles: Synthesis, Optical Properties, and Applications
"Explore the fascinating world of gold nanoparticles, their synthesis methods, optical properties, and wide-ranging applications in medicine and industry. Learn about nanofluids and the chemical reduction method for preparing gold nanofluids. Dive into surface plasmon resonance and its significance in metal nanoparticles. Discover the latest research by Dr. Rajesh Kumar on gold nanoparticles at Nirmala College, Kerala."
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Presentation Transcript
GOLD NANOPARTICLES - SYNTHESIS, OPTICAL PROPERTIES AND APPLICATIONS DR. RAJESH KUMAR B ASSISTANT PROFESSOR DEPARTMENT OF PHYSICS NIRMALA COLLEGE MUVATTUPUZHA KERALA
Gold Nanoparticles Gold colloids have been known since ancient times for their fascinating properties and colours Why is there such great current interest ingold nanoparticles (AuNPs) Facile methods of synthesis and Stability in a wide variety of solvents High degree of control over size and shape Wide range of medical and industrial applications 2
Nanofluid Nanofluids a simple product of the emerging world of nanotechnology are suspensions of nanoparticles (1 100nm) in conventional base fluids such as water, oils, or glycols Synthesis of Nanofluid Single-step technique: The Two-step technique: The two step single step simultaneously method starts with producing NP by makes and disperses the NPs one of the physical or chemical directly into a base fluid processes, and proceeds to best for metallic nanofluids disperse them into a base fluid Nanoparticles agglomeration is Good for oxide nanofluids minimized 3
Synthesis of Gold nanofluid - Chemical Reduction Method The chemical reduction method presents, with respect to other routes, several advantages, mainly related to Easy synthesis procedure Reproducibility of the method Stability of the prepared sol 4
Synthesis of Gold nanofluid - Chemical Reduction Method Materials Gold chloride trihydrate (HAuCl4.3H2O) Sodium citrate tribasic dihydrate (Na3C6H5O7.3H2O) Double-distilled water Procedure for the preparation of AuNPs To the rapidly-stirred boiling 100 ml of 1 mM HAuCl4 solution, 10 ml of 38.8 mM trisodium citrate dihydrate (Na3C6H5O7.3H2O) solution is quickly added Gold Nanofluid The solution colour changed from yellow to black and then to red or purple colour depending on the sizes of the NPs 5
Surface Plasmon Resonance Surface plasmon resonance is the collective oscillation of the conduction electrons induced by the incident electric field (light) When an external light wave is incident on a metal nanoparticle, its electric field E0 periodically displaces the sphere s electrons with respect to the lattice, resulting in oscillating electron density 6
Applications of Gold nanoparticles Industrial cooling Biomedical applications applications Biosensing Carriers for drug delivery applications Surface-enhanced To produce thermal Raman scattering tumor ablation Catalytic activity Antibacterial activity 7
Thank You Thank You 8
