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HomeAuthorsChoi J.W.

Authors: Choi J.W.

Synthesis of hollow silica particles with tunables ize,shell thickness,and morphology

Kim J., Lee J., Chang H., Choi J.W., Jang H-D, Kim J., Korea Institute of Geoscience and Mineral Resources, KR
Here, we provide simple methods to modify the particle size, shell thickness, and the morphology of hollow silica particles (HSPs). To synthesize the HSPs, we adopted polystyrene (PS) particles as a sacrificial template. Size tune [...]

Observation of Early to Full Covering Stages of Ethylene-based CVD of Graphene

Celebi K., Choi J.W., Cole M.T., Altun A.O., Teo K.B.K., Park H.G., ETH Zürich, CH
Scalable growth of graphene has been demonstrated by chemical vapour deposition (CVD) using copper-based catalyst and ethylene precursor. Here, we present our ethylene-based CVD synthesis method of graphene along with our observation of early and [...]

Fabrication of ITO/Gold nanoparticle/RGD peptide Composites to Enhance Electrochemical Signals from Human Neural Stem Cells

Kim T-H., Choi J.W., Sogang University, KR
Gold nanoparticles (GNP) and RGD peptide modified indium tin oxide (ITO) electrode was fabricated to enhance the electrochemical signals from neural stem cells (HB1.F3). ITO film is well-known transparent and conductive material suitable for both [...]

Simultaneous determination of guanine and adenine on nano-poly(4-aminothiophenol) patterns modified ITO electrode

El-said W.A., Kim T-H., Choi J.W., Sogang University, KR
Here, poly(4-aminothiophenol) nano-patterns modified ITO electrode was fabricated to investigate the electrochemical behavior of A and G individual as well as simultaneous detection of mixture of A and G. The results demonstrated that nano-poly(4-aminothiophenol)/ITO can [...]

Direct Electrochemical Reduction of CuO Nano Particles to Cu Nano Particles in NaCl Solution

Hwang G-H, Han W-K, Hong S-J, Choi J.W., Kang S-G, Hanyang University, KR
Copper nanoparticles are widely used material. However many reactive metals are difficult to produce without complex and expensive procedures. For low cost and mass production, the electrochemical reduction is a convenient technique to manufacture metal [...]

Signal Amplification of Surface Plasmon Resonance based on Gold Nanoparticle-Antibody Conjugate and its Application to Protein Array

Lee D-B, Lee W., Lee D-B, Lee W., Kim Y-W., Choi J.W., Sogang University, KR
Nanoparticles have offered many diverse capabilities in bioanalysis and biotechnological applications, due to the intrinsic properties of nanoparticle that is distinguished from bulk materials. The integration of nanoparticle, which exhibit unique electronic, photonic, and catalytic [...]

Protein Array Fabricated by Micro-Contact Printing Method for Detection of Marker Protein to Genetically Modified Organisms

Lee W., Paek S-H, Choi J.W., Sogang Univerisity, KR
For the past decade, microarray technology has evolved from genomics to proteomics. This trend offers several advantages. In small volumes, biochemical reactions may not be diffusion-limited and may thus be more efficient; less reagent and [...]

Analysis of Physico-Chemical Processes in an Amperometric Oxygen Biosensor

Krishnamoorthy S., Feng J.J., Makhijani V.B., Gao C., Choi J.W., Ahn C., CFD Research Corporation, US
Amperometric techniques are commonly used in lab-on-a-chip systems to sense various blood gas analytes such as H+, CO2, O2, etc. In the present study, a microchip-based amperometric biosensor, being developed as a part of plastic-based [...]

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