Focus:
Professor Angus' current research is focused on diamond synthesis, including growth of doped, semiconducting diamond, and the growth of bulk crystals of the group III nitrides and related compounds.
Research:
A major thrust of Professor Angus' research is to relate the electronic properties and electrochemical response of conducting diamond to theoretical predictions of its electronic structure. Particular emphasis is being placed on several inter-related areas: co-doping of diamond with sulfur and boron to produce n-type conductivity; and relating surface electrochemical effects that produce p-type surface conductivity in diamond to the electronic structure of diamond and the chemical nature of surface termination and adsorbates.
Professor Angus is also conducting research on novel methods for the synthesis of gallium nitride and indium nitride and related II-IV nitrides, such as zinc germanium nitride. Bulk growth of these materials from liquid metallic phases saturated with nitrogen from a nitrogen plasma is being attempted. A long range goal is to grow large, bulk single crystals of GaN for use as a substrate for opto-electronic devices.
The research programs are highly interdisciplinary and include collaborations with Professor A.B. Anderson (Chemisty), Professors H.B. Martin and U. Landau (Chemical Engineering) and Professor K. Kash (Physics).
Selected Publications:
S.C. Eaton, A.B. Anderson, J.C. Angus, Y.E. Evstefeeva, Y. Pleskov, "Diamond Growth in the Presence of Boron and Sulfur", Diamond and Related Materials 12, 1627-1632 (2003)
Alfred B. Anderson, Lubomir N. Kostadinov and John C. Angus, "Hydrogen Atom Pairs in Diamond Bulk and a the Surface: Hybrid Density Functional Theory and Cluster Models," Phys. Rev. B. 67, 233402 (2003)
Tiberiu Fulop, Challa Bekele, Uziel Landau, John C. Angus and Kathleeen Kash, "Electrodeposition of Polycrystalline InSb from Aqueous Electrolytes," Thin Solid Films 449, 1-5 (2004).
John C. Angus, Yuri V. Pleskov and Sally C. Eaton, "Electrochemistry of Diamond," Chapter in Thin Film Diamond II, J. Ristein and C. Nebel, Editors, pp. 545-567, Elsevier, Academic Press, Amsterdam, 2004.
Vidhya Chakrapani, Sally C. Eaton, Alfred B. Anderson, Massood Tabib-Azar, John C. Angus, "Studies of the Adsorbate-Induced Conductance of Diamond Surfaces", Electrochem. and Solid State Lett. 8, E4-E8 (2005).
Yu Cai, Alfred B. Anderson, John C. Angus, Lubomir N. Kostadinov, “Hydrogen Evolution on Diamond Electrodes and Its Dependence on Surface C-H Bond Strengths,” Electrochem and Solid State Lett. 8, (2005)
Yu Cai, Alfred B. Anderson, John C. Angus, Lubomir N. Kostadinov, "Hydrogen Evolution on Diamond Electrodes by the Volmer-Heyrovsky Mechanism: Prediction of Reversible Potentials and Activation Energies," submitted to Journal of the Electrochemical Society, May, 2006. |
