Shim Research Group

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Research areas: Synthesis&Chemistry Charging&Charge Separation Applications

SYNTHESIS AND CHEMICAL PROCESSING OF NANOSCALE MATERIALS
In addition to improving properties/performance of reltively new but established nanoscale materials, our efforts in synthesis and chemical processing also focus on developing new multicomponent, multifunctional systems.

Anisotropic Nanocrystal Heterostructures
Nanocrystal heterostructures (NCHs) consisting of two or more inorganic phases with well-controlled morphologies provide novel approaches in engineering properties of materials. A variety of unique aspects arising at the nanometer length scale from enormous surface areas to quantum-confinement effects may be combined to achieve unprecedented capabilities. Some examples of current NCHs being developed include type II band offset, magnetic/plasmonic, and magnetic/semiconducting systems.

Selected Publications:

“gamma-Fe₂O₃/II-VI Sulfide Nanocrystal Heterojunctions,” K. –W. Kwon and M. Shim, J. Am. Chem. Soc., 127, 10268 (2005). [DOI: 10.1021/ja051713q]
“Structural Evolution in Metal Oxide/Semiconductor Colloidal Nanocrystal Heterostructures,” K. –W. Kwon, B. H. Lee, and M. Shim, Chem. Mater. 18, 6357 (2006). [DOI: 10.1021/cm0621390]
“Semiconductor/Polymer Hybrid Colloidal Nanoparticles,” B. H. Lee, K. –W. Kwon, and M. Shim, J. Mater. Chem. 17, 1284 – 1291 (2007). [DOI: 10.1039/b615712b]

Carbon Nanotube-based Materials
Our current efforts in synthesis and chemistry of single walled carbon nanotubes focus on electronically selective growth/separation, faciliating alignment and patterning, and providing new reliable routes to heterointerfaces of carbon nanotubes with other electronically/optically active materials.

Selected Publications:

“Electronically Selective Chemical Functionalization of Carbon Nanotubes: Correlation between Raman Spectral and Electrical Responses,” J. Am. Chem. Soc., 127, 11460 (2005). [DOI: 10.1021/ja0526564]
“Guided growth of large-scale, horizontally aligned arrays of single-walled carbon nanotubes and their use in thin-film transistors,” Small1, 1110 (2005). [DOI: 10.1002/smll.200500120]
“Growth Modes of Carbon Nanotubes on Metal Substrates,” J. Appl. Phys. 100, 044309 (2006). [doi: 10.1063/1.2219000]
“Raman Spectral Evolution in Individual Metallic Single-Walled Carbon Nanotubes upon Covalent Bond Formation,” J. Phys. Chem. C 111, 17755 (2007). [DOI: 10.1021/jp070560l]