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

Zhi Qiang Xie, Jaeil Bai, Yun Shen Zhou, Yi Gao, Jongbok Park, Thomas Guillemet, Lan Jiang, Xiao Cheng Zeng, Yong Feng Lu

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

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 CO 2laser steers the chemical reactions and promotes proportion of intermediate oxide species, which results in preferential growth of {100}-oriented diamond films and diamond single crystals in open air. Quantum molecular dynamic simulations and calculations of chemisorption energies of radicals detected from our mass-spectroscopy experiment provide an in-depth understanding of molecular reaction mechanisms in the steering of chemical reactions and control of crystallographic orientations. This finding opens up a new avenue for controlled chemical vapor deposition of crystals through resonant vibrational excitations to steer surface chemistry.

Original languageEnglish (US)
Article number4581
JournalScientific reports
Volume4
DOIs
StatePublished - Apr 3 2014

ASJC Scopus subject areas

  • General

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