Photo-Modification and Synthesis of Semiconductor Nanocrystals
Abstract
The ultimate goal of nanofabrication is to control the size and positioning. We propose a simple and innovative way to achieve the goal by making the best use of a strong photon-nanoparticle interaction. Because of its large surface to volume ratio and carrier confinement in a nanoparticle, the semiconductor nanoparticle can be easily modified or synthesized by the light irradiation. We have observed two unique phenomena to manifest the photon-nanoparticle interaction: photo-oxidation and photo-synthesis. In both photo-oxidation and photo-synthesis, the sizes are self-limited to the photon energy of monochromatic light such as laser and are well controlled.
07/01/2011 at 4:00 pm
Mr. Santosh Kumar Das, VECC, Kolkata
NP Seminar
Lecture Hall Block A, Institute of Physics
Document Date:
Characterizing quark gluon plasma by heavy flavors
Study of Vapor Deposition Polymerization Using Monte Carlo Growth Model
Abstract
Morphological scaling properties of linear polymer films grown by vapor deposition polymerization (VDP) using 1+1D Monte Carlosimulations will be discussed in this talk. The lattice model implements the basicprocesses of random angle ballistic deposition (F), free-monomer diffusion (D), and monomer adsorption along with other dynamical processes of polymer chaininitiation,extension, and merger. The ratio G=D/F is found to have a strong influence on the polymer film morphology. Spatial and temporal behavior of kinetic roughening has been extensively studied using finite-length scaling and height-heightcorrelations. The scaling analysis has been performed within no-overhangapproximation andrelevant scaling exponents for film-interface evolution have been studied forvarying free-monomer diffusion.
10/11/2010 at 4:00 pm
Dr. A. Sahay, IIT, Kanpur
HEP Seminar
Lecture Hall Block A, Institute of Physics
Document Date:
Thermodynamic Geometry and Phase Transition in AdS Black Holes
