Seminar by Dr. Indranath Chakraborty, Humboldt Fellow, University of Hamburg on "Unraveling the Hidden Chemistry at Nanoparticle Surfaces"
15 Mar 2019
Seminar Room #350
Talk Title :"Unraveling the Hidden Chemistry at Nanoparticle Surfaces"
Abstract
Particles in nanodimensionhave drawn tremendous research interest owing to their tunable optical and photophysical properties.1, 2As the dimension of a solid becomes smaller (in nanometer range), the ratio of surface atoms increases dramatically. For a 3 nmgold nanoparticle, ~ 50% atoms are on the surface, while for a large bulk material, the surface layer is only a tiny fraction of the total solid. Thus,surfaces playmajor rolesin dictating propertiesof colloidal nanoparticles.3Tuning nanoparticles surfaces is very important to introducenew properties to the systemsuch as solubility, self-assembly, sensing, biocompatibility, etc. Such surface tuning were utilized in developing optoelectronic4or biocompatible properties and inunderstandingof hidden dynamics.5In this seminar, few such examples were brought in to highlight the importance of chemistry underlying those nanoparticle surfaces even at single particle level. The seminar will explainhow atomically precise nanoclusters can induce unusual bilayer assemblyin the TeNWsystemand how proteinstructurecan control nanoparticles surfacesto create differently shaped nanoparticles.6-8Along with ensemble analysis,the seminarwill also explain how single nanoparticle spectroscopy reveals the hidden dynamics of a simple galvanic exchange reaction which results out different surface structure.