1. Self-Assembly into the Condensed Phase
NIRT: Nanometer Stoichiometric Particle Compound Solutions and Control of their
Self-Assembly into the Condensed Phase
Chris Sorensen, Christer Aakeroy, Amit Chakrabarti, Ken Klabunde and Bruce Law
Kansas State University
Departments of Physics and Chemistry
The sizes of superclusters of 5 nm Au/C12SH NPs formed with different quench temps, from 65C. Line is best fit to nucleation theory with fit variable, the surface tension of solid phase 0.042erg/cm2kT/(dia.)2.
Goals of our project are: 1
Develop new synthetic methods for creation of large amounts of a large variety of nearly monodisperse nanoparticles.
Explore and then control the solution behavior of nanoparticles.
Explore and then control self assembly of nanoparticles. 2 3
Synthesis of CdS, CdSe and CdTe
TEM images clearly show that replacing the methyl-ligands with ligands terminated with a hydrogen-bond functionality plays a significant role in the ordering of nanoparticles.
Dodecylamine gold nanoparticles form an ordered superlattice.
11-mercaptoundecanoic acid particles form fractal type aggregation, consistent with relatively strong hydrogen bond interactions.
In comparison, very little interaction is observed between 11-mercaptoundecan-1-ol nanoparticles, however still significantly different to dodecylamine gold nanoparticles.
Evaporate bulk material into frozen organic matrix (SMAD).
Digestive ripen, i.e. heat for a few hours in the presence of ligands such as TOP, TOPO, Oleyl amine.
Gram quantities produced.
Interaction potentials for 5 nm Au particles with various ligands.
Phase diagram of 5nm Au/C12SH nanoparticles in 4% t-butyl toluene + 96% 2-butanone.
Simulation of nanoparticle superclusters growing out of solution.
UV stimulated fluorescence of CdTe NPs.