Indian Institute of Technology Delhi
Tuning Nanoparticle Surfaces: From Cluster Induced Assembly to
Dynamics at Single Particle Level
Dr. Indranath Chakraborty
Alexander von Humboldt Fellow and Junior Group Leader
Center for Hybrid Nanostructure (CHyN)
University of Hamburg
Date: January 23rd 2018 (Tuesday)
Time: 4 PM
Venue: Committee Room, Chemistry Department, 6th Floor
Particles in nano dimension have drawn tremendous research interest owing to their
tunable optical and photophysical properties.1, 2 As the dimension of a solid becomes smaller (in
nanometer range), the ratio of surface atoms increases dramatically. For a 3 nm gold
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 play major roles in dictating properties of
colloidal nanoparticles.3 Tuning nanoparticles surfaces is very important to introduce new
properties to the system such as solubility, self-assembly, sensing, biocompatibility, etc. Here,
few such examples were brought in to highlight the importance of surface tuning in developing
optoelectronic4 or biocompatible properties along with the understanding of hidden dynamics at
the single particle level.5 We have shown how atomically precise nanoclusters can induce
unusual bilayer assembly in the TeNW system and how protein can control nanoparticles
surfaces to create differently shaped nanoparticles which help to build a model system to
understand the particle toxicity. Along with ensemble analysis, we will explain how single
nanoparticle spectroscopy reveals the hidden dynamics of a simple galvanic exchange reaction
which results out different surface structure.
- M. A. Boles, D. Ling, T. Hyeon and D. V. Talapin, Nat. Mater., 2016, 15, 141-153.
- I. Chakraborty and T. Pradeep, Chem. Rev., 2017, 117, 8208-8271.
- J. Hühn, C. Carrillo-Carrion, M. G. Soliman, C. Pfeiffer, D. Valdeperez, A. Masood, I. Chakraborty, L.
Zhu, M. Gallego, Z. Yue, M. Carril, N. Feliu, A. Escudero, A. M. Alkilany, B. Pelaz, P. del Pino and W. J.
Parak, Chem. Mater., 2017, 29, 399-461.
- A. Som,# I. Chakraborty,# T. A. Maark,# S. Bhat and T. Pradeep, Adv. Mater., 2016, 28, 2827-2833
- J. G. Smith,# I. Chakraborty# and P. K. Jain, Angew. Chem., Int. Ed., 2016, 55, 9979-9983 (#contributed
All are cordially invited to attend.