Kyunghoon Kim

A broadband tunable absorber is designed and fabricated. The tunable absorber is comprised of a dielectric-metal-dielectric multilayer and plasmonic grating. A large size of tunable absorber device is fabricated by nano-imprinting method. The experimental results show that over 90% absorption can be achieved within visible and near-infrared regimes. Moreover, the high absorption can be controlled by changing the polarization of incident light. This polarization-sensitive tunable absorber can hav

While two-dimensional layered nanomaterials including transition metal oxides and transition metal dichalcogenides have been widely researched because of their unique electronic and optical properties, they still have some limitations. To overcome these limitations, transition metal oxides and transition metal dichalcogenides based nanocomposites have been developed using various methods and have exhibited superior properties. In this paper, we introduce the photodeposition method and review the

Sensing targeted tumor markers with high sensitivity provides vital information for the fast diagnosis and treatment of cancer patients. A vascular endothelial growth factor (VEGF₁₆₅) have recently emerged as a promising biomarker of tumor cells. The electrochemical aptasensor is a promising tool for detecting VEGF₁₆₅ because of its advantages such as a low cost and quantitative analysis. To produce a sensitive and stable sensor electrode, nanocomposites based on polyanilin

Carbon nanotube (CNT) has excellent properties as a coating material. However, most methods for CNT coating have limitations. Recent studies have shown that polydopamine (PDA) can be used as a good and eco-friendly corrosion resistance coating material. However, the effect of PDA/CNT nanocomposite coating on the corrosion mitigation property of carbon steel (CS) remains unknown. Therefore, the objective of this study was to determine the effect of PDA/CNT nanocomposite coating on the corrosion m

We report the measurements of transport of ions and uncharged species through carbon nanotube (CNT) porins--short segments of CNTs inserted into a lipid bilayer membrane. Rejection characteristics of the CNT porins are governed by size exclusion for the uncharged species. In contrast, rejection of ionic species is governed by the electrostatic repulsion and Donnan membrane equilibrium. Permeability of monovalent cations follows the general trend in the hydrated ion size, except in the case of Cs

We have shown previously [Kim, K. and Meyer, R.J. (1985) J. Mol. Biol. 185,755-767] that copy-number of the broad host-range plasmid R1162 is controlled by the amounts of two proteins, encoded by cotranscribed genes comprising a region of the plasmid called RepI. We have now demonstrated that expression of RepI is negatively regulated by a 75 base RNA that is complementary to a segment of the RepI message. Increased intracellular amounts of RNA molecules that include this segment relieve the inh

This study discusses a new coating method to protect 316L stainless steel (SS) from pitting corrosion in high chloride environments. The SS surface was coated using a simple, eco-friendly method, and sunflower oil (SunFO) was used as a base coating and binder for molybdenum disulfide (MoS2). The coated surface was observed using scanning electron microscopy (SEM) with an energy dispersive spectrometer (EDS) and X-ray diffraction (XRD). Corrosion behavior was examined by open-circuit potential (O

Little is known about temporal trends of pregnant women's exposures to environmental phenols and parabens. We quantified four phenols [bisphenol A (BPA), bisphenol F, bisphenol S, and triclosan), four parabens [butyl paraben, ethyl paraben (ETPB), methyl paraben (MEPB), and propyl paraben (PRPB)], and triclocarban in 760 urine samples collected during 2007-2014 from 218 California pregnant women participating in a high-familial risk autism spectrum disorder cohort. We applied multiple regression

The physical and electrical characteristics of oxide buffer layers for Cu-based coated conductors are reviewed, with emphasis on the need for conductive buffers and advanced Cu-based substrates. Methods for preventing Cu oxidation are discussed because it is an anticipated problem for applications using Cu-based rolling assisted biaxially textured substrates (RABiTS).

The mitigation of organic fouling is a main challenge for forward osmosis (FO) technology. In order to enhance the fouling resistance and desalination efficiency of the FO membrane, various studies have suggested the incorporation of nanomaterials into thin-film composite (TFC) membranes, which are defined as thin-film nanocomposite (TFN) membranes. In this study, we fabricated MoS2-Ag nanofillers by photochemical deposition method and incorporated them into TFC membranes for FO water treatment.

The eggshell membrane (ESM) is usually regarded as an agricultural byproduct waste, even though it has unique properties as a biomaterial. In particular, the ESM has a flexible and highly pure microfibrous network structure that can be used as an artificial extracellular matrix (ECM) platform for engraftment or as a tissue-engineered scaffold. In this study, flexible and functional scaffolds were constructed using an ESM and graphene, and their applicability for stem cell and tissue engineering

Two-dimensional transition metal dichalcogenides have demonstrated potential for advanced electrical and optoelectronic applications. For these applications, it is necessary to modify their electrical or optoelectronic properties. Doping is one of the most prevalent techniques to modify the band structure of semiconductor materials. Herein, we report the p-type doping effect on few-layer and multi-layer MoS2 that are selectively decorated with Ag nanoparticles via laser-assisted direct photoexci