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788 results on '"Lee, Jaebeom"'

56. An Insight into the Magnetic Field Effects on Spin-Dependent Electrochemical Redox Reactions and Electroreduction Kinetic Parameters by Using a Magneto-Plasmonic Ag@Fe3O4 Sensing Nanoplatform

Author

Anh, Nguyen Tuan, primary, Dinh, Ngo Xuan, additional, Huyen, Nguyen Ngoc, additional, Thi Lan Huong, Phung, additional, Phan, Vu Ngoc, additional, Thang, Pham Duc, additional, Van Tuan, Hoang, additional, Van Tan, Tran, additional, Lee, Jaebeom, additional, and Le, Anh-Tuan, additional

Published
2023
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58. Theory of plasmon-enhanced Foerster energy transfer in optically-excited semiconductor and metal nanoparticles

Author

Govorov, Alexander O., Lee, Jaebeom, and Kotov, Nicholas A.

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Materials Science
Abstract

We describe the process of Foerster transfer between semiconductor nanoparticles in the presence of a metal subsystem (metal nanocrystals). In the presence of metal nanocrystals, the Foerster process can become faster and more long-range. The enhancement of Foerster transfer occurs due to the effect of plasmon-assisted amplification of electric fields inside the nanoscale assembly. Simultaneously, metal nanocrystals lead to an increase of energy losses during the Foerster transfer process. We derive convenient equations for the energy transfer rates, photoluminescence intensities, and energy dissipation rates in the please of plasmon resonances. Because of strong dissipation due to the metal, an experimental observation of plasmon-enhanced Foerster transfer requires special conditions. As possible experimental methods, we consider cw- and time-resolved photoluminescence studies and describe the conditions to observe plasmon-enhanced transfer. In particular, we show that the photoluminescence spectra should be carefully analyzed since the plasmon-enhanced Foerster effect can appear together with strong exciton energy dissipation. Our results can be applied to a variety of experimental nanoscale systems., Comment: 60 pages

Published
2006
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84. Wearable Liquid Metal Composite with Skin-Adhesive Chitosan–Alginate–Chitosan Hydrogel for Stable Electromyogram Signal Monitoring.

Author

Kim, Jaehyon, Kim, Yewon, Lee, Jaebeom, Shin, Mikyung, and Son, Donghee

Subjects
LIQUID metals, METALLIC composites, ROBOT motion, FILLER metal, HAND signals, EUTECTIC alloys
Abstract

In wearable bioelectronics, various studies have focused on enhancing prosthetic control accuracy by improving the quality of physiological signals. The fabrication of conductive composites through the addition of metal fillers is one way to achieve stretchability, conductivity, and biocompatibility. However, it is difficult to measure stable biological signals using these soft electronics during physical activities because of the slipping issues of the devices, which results in the inaccurate placement of the device at the target part of the body. To address these limitations, it is necessary to reduce the stiffness of the conductive materials and enhance the adhesion between the device and the skin. In this study, we measured the electromyography (EMG) signals by applying a three-layered hydrogel structure composed of chitosan–alginate–chitosan (CAC) to a stretchable electrode fabricated using a composite of styrene–ethylene–butylene–styrene and eutectic gallium-indium. We observed stable adhesion of the CAC hydrogel to the skin, which aided in keeping the electrode attached to the skin during the subject movement. Finally, we fabricated a multichannel array of CAC-coated composite electrodes (CACCE) to demonstrate the accurate classification of the EMG signals based on hand movements and channel placement, which was followed by the movement of the robot arm. [ABSTRACT FROM AUTHOR]

Published
2023
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