EECS Colloquium

                                                                                                       Host: Hyeon-Ho Jeong / Language: Korean

Thursday, September. 04, 2025, 16:00~

Haerim Hall, EECS-B Bldg. 1st Floor

SERSitive meta-surface for capturing nanoparticle beyond molecular diffusion

Prof. Yong-Sang Ryu

Department of Micro/Nano Systems, Korea University of Biomedical Engineering

[Abstract]                                                                                                                                                                                                                                                                                                                                                                                                                     

 In addition to the development of nanomaterials, a crucial aspect lies in the application technology of various nanostructures using these nanomaterials. Utilizing semiconductor processing technology, the utilization of materials tailored for specific purposes and the development of components composed of these materials are currently fundamental elements in the field of science. In this colloquium, a researcher who graduated from the Department of Electrical Engineering and underwent training under a physics professor will introduce research on the development of optoelectronic materials/components integrated with nano/biosensors. Particularly, there will be a comprehensive study session on various sensor application technologies using the layered structure of metal-insulator-metal and the underlying operational mechanisms together with AI-assisted analysis. Emerging as substantial concerns in ecosystem, sub-micron plastics have become the newest issues for its considerable hazards. However, their effect and even amount in the environment remains unclear. Establishing a substantive analytic platform is essential to expanding understanding of nanoplastics and nanoparticles that freely diffuse in water. However, the issues of diffusion and detection limit, that arise from ultra-diluted concentration and extremely small scales of nanoplastics, leave significant technical hurdles to analyze the nanoplastic pollutants. In this study, we obtain effective Raman signals in real-time from nanoplastics with ultra low-concentrations via AC electro-osmotic flows and dielectrophoretic tweezing. This enables the field-induced active collection of nanoplastics toward the optical sensing area from remote areas in a rapid manner. A step further, synergetic combination with plasmonic nanorods accomplishes the highest on-site detection performance so far. Integrating conventional technical skills of pre-concentration, separation, and identification in a single process, our methodology will provide new opportunities for nanoplastic detection.

[Short Biography]

Research Topics

● Major experienced scientific research fields of Nanobio, NEMS/MEMS Biophysics, Photonics, Optoelectronics, Electro-hydrodynamics

● Detection/monitoring/analysis of Nanobio material using optical/electrical instrument (optoelectronics, sensor, photonics including SW simulation&analysis) via Nano/micro-chip design&fabrication(NEMS/MEMS) technique

√ Cross-disciplinary topics for NT-BT-ET-IT 

  - NT(MEMS,NEMS,thin film manipulation for design of optoelectronic device, photonic chip)

  - BT(Biophysics and related reconstruction of biological phenomena via proteins&Extracellular vesicle, lipids)

  - ET(Hazardous nanopaticulate or gas such as ultrafine dust, micro/nano plastic, virus, Hydrogen gas)

  - IT(Electronics and photonics as analytical methods)

Education & Carrer

2003-2007 B.S., Dept of Electrical Engineering at Seoul National University, Korea.

2007-2009 M.S., Dept of Electrical Engineering at Seoul National University, Korea.

2009-2013 Ph.D., Dept of Electrical Engineering at Seoul National University, Korea.

2013-2016 Postdoc, Dept of Electrical Engineering at Univ. of Minnesota-Twin Cities, U.S.A.

Professional Experience

2021-2023 KU-KIST Professor, Department of Graduate School of Converging Science and Technology, Korea University, Korea.

2023- Associate Professor, School of Biomedical Engineering, Korea University, Korea.