Control of crystallographic orientation in diamond synthesis through laser resonant vibrational excitation of precursor molecules.

ABSTRACT: Crystallographic orientations determine the optical, electrical, mechanical, and thermal properties of crystals. Control of crystallographic orientations has been studied by changing the growth parameters, including temperature, pressure, proportion of precursors, and surface conditions. However, molecular dynamic mechanisms underlying these controls remain largely unknown. Here we achieved control of crystallographic orientations in diamond growth through a joint experimental and theoretical study of laser resonant vibrational excitation of precursor molecules (ethylene). Resonant vibrational excitation of the ethylene molecules using a wavelength-tunable CO2 laser steers the chemical reactions and promotes proportion of intermediate oxide species, which results in preferential growth of

SUBMITTER: Xie ZQ 

PROVIDER: S-EPMC3974139 | biostudies-literature | 2014 Apr

REPOSITORIES: biostudies-literature