Faculty

Hyungsoo Choi

Hyungsoo Choi

Lecturer
330K Everitt Lab, MC-702
1406 W. Green
Urbana, Illinois 61801
(217) 333-0435
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Senior Research Scientist
Research Staff
101 Optical Physics Engineering Bldg
607 E. Healey Street
Champaign, Illinois 61820
(217) 244-6345
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Ph.D. Chemistry, Brown University, 1983

Research Statement:
Synthesis and development of tailored organometallic, inorganic and polymeric precursors to deposit nanoscale materials, such as thin films, nanoparticles and nanowires of metals and ceramics, and micro and nano-spheres of biomaterials, via sol-gel processing, flow-limited field emission electrostatic spray (FFESS) deposition, and chemical vapor deposition (CVD) for applications including dye-sensitized solar cells and display devices, and via precision particle fabrication (PPF) technology for advanced drug delivery systems and encapsulation of cells, especially islets for the treatment of type I diabetes.

Research Interests:

  • Precursors for Nanoscale materials synthesis: Syntheses and development of tailored organometallic, inorganic and polymeric precursors
  • Thin film and nanoparticle fabrication: Thin films, micro and nano particles, and nanowires/tubes via sol-gel processing, charged liquid cluster beam (CLCB) deposition, chemical vapor deposition (CVD), chemical solution deposition (CSD), and precision particle fabrication (PPF) technology.
  • Electronic and optical materials: electronic, optical and magnetic materials for various devices involving thin films, micro and nano particles, and nanowires/tubes of metals, and metal nitrides and oxides utilizing their electronic, optical, optoelectronic, and magnetic properties.
  • Bio-materials: micro and nano spheres/capsules of biodegradable/compatible materials for advance drug delivery, tissue engineering, and encapsulating cells.

Honors, Recognition, and Outstanding Achievements for Research

  • Arnold O. Beckman Research Award, 2006

Journal Articles

  • Y. B. Choy, F. Cheng, H. Choi, and K. Kim, “Uniform Chitosan Microspheres for Potential Application to Colon-Specific Drug Delivery", Macromol. Biosci. DOI: 10.1002/mabi.200800079.
  • C. Kim, W. Gu, M. Briceno, I. M. Robertson, H. Choi, and K. Kim, “Copper Nanowires with Five-Twinned Structure Grown by Chemical Vapor Deposition” Adv. Mater. 2008, 20, 1859–1863.
  • Y. B. Choy, F. Cheng, H. Choi, and K. Kim "Monodisperse Gelatin Microspheres as a Drug Delivery Vehicle: Release Profile and Effect of Cross-Linking Density", Macromol. Biosci. 2008, 8, 758–765.
  • W. Gu, P. E. Heil, H. Choi, and K. Kim, "Comprehensive model for fine Coulomb fission of liquid droplets charged to Rayleigh limit Comprehensive model for fine Coulomb fission of liquid droplets charged to Rayleigh limit", Appl. Phys. Lett. 2007, 91, 064104.
  • Y. B. Choy, H. Choi, and K. Kim, "Fabrication of uniform biodegradable hydrogel microspheres by a surfactant-free electric-field-assisted method," Macromol. Biosci. 2007, 7, 423-428.
  • W. Gu, H. Choi, and K. Kim,"Universal approach to accurate resistivity measurement for a single nanowire: Theory and application", Appl. Phys. Lett. 2006, 89, 253102.
  • S. Park, S. Lim and H. Choi, "Fe(II) Hydrides as Precursors for Chemical Vapor Deposition of Iron and Iron Oxide Thin Films", Chem. Mater., 2006, 18, 5150.
  • H. Choi and S. Park, "Seedless Growth of Free-Standing Copper Nanowires by Chemical Vapor Deposition", J. Am. Chem. Soc. 2004, 126, 6248 -6249.
  • H. Kang, S. Park, H. Choi, K. Kim, M. Sung, "SrTiO3 Thin Films Deposited by Charged Liquid Cluster Beam Technique in Combination with Sol-Gel Processing", Electrochem. Solid-State Lett., 2004, 7, F70 ?F72.
  • H. Kang, S. Park, H. Choi, K. Kim, M. Sung, "Low-Temperature Growth of Highly Crystalline (Ba, Sr)TiO3 Films by Charged Liquid Cluster Beam Method", Electrochem. Solid-State Lett., 2004, 7, F77 ?F80.
  • H. Choi, S. Park, and T. H. Kim, "Novel Nickel Precursors for Chemical Vapor Deposition," Chemistry of Materials, vol. 15, p. 3735, 2003.
  • H. Choi and S. Park, "Liquid Cobalt(I) Hydride Complexes as Precursors for Chemical Vapor Deposition," Chemistry of Materials, vol. 15, p. 3121, 2003.
  • H. Choi and S. Hwang, "Volatile Amidoalane Complexes for Chemical Vapor Deposition of Aluminum", Chem. Mater. 1998, 10, 2323.
  • H. Choi and S. Hwang, "Copper(I) Tert-butyl-3-oxobutanoate Complexes as Precursors for Chemical Vapor Deposition of Copper", Chem. Mater. 1998, 10, 2326.
  • M. Cich, K. Kim, H. Choi and S. Hwang, "Deposition of (Zn,Mn)2SiO4 for plasma display panels using charged liquid cluster beam," Appl. Phy. Lett. 1998, 73, 2116.

Patents

  • "Nanostructures Including A Metal," H. Choi, PCT 10/664,431(US), 2003; U. S. Patent No. 7,344,753, 2008.
  • "Microparticles," K. Kim, H. Choi, and Y. B. Choy, U. S. Patent No. 7,309,500, 2007.
  • "Organometallic Compounds and their use as Precursors for Forming Films, and Powders of Metal or Metal Derivatives," H. Choi, PCT Applied, 2001; U. S. Patent No. 6,777,565, 2004.
  • "Organocopper Precursors for Chemical Vapor Deposition," H. Choi, U. S. Patent No. 6,538,147.
  • "Amidoalane Precursors for Chemical Vapor Deposition of Aluminum", H. Choi, U. S. Patent No. 5,880,303, 1999.
  • "Method for the Production of Highly Pure Copper Thin Films by Chemical Vapor Deposition", H. Choi, Y. Cho, J. Lim, and S. Hwang, U. S. Patent No. 5,441,300, 1995.