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김경호,이주복,Kang Evan S.H.,김동현,이현숙 한국물리학회 2021 Current Applied Physics Vol.31 No.-
We investigate the nanogap and polarization-resolved excitation of gap plasmon modes using terrace-stepped hexagonal boron nitride (hBN) sandwiched between Ag nanowires and Au substrates for a metal–insulator–metal gap structure. The gap plasmon modes in the proposed hybrid structure are dominantly excited by a Ppolarized incident light, which is supported by full-wave numerical simulations. Plasmon mode evolution for various hBN spacer thicknesses ranging from 5 to 90 nm shows that optical signals acquired via unpolarized dark-field mapping spectroscopy are primarily due to the optical scattering of the P-polarized incident light. Moreover, this plasmonic mode changes significantly from gap plasmon mode to Fabry–Perot-type resonance in a hBN thickness of 50–90 nm. Our analysis reveals that the proposed hybrid structure based on Ag nanowires and stepped hBN provides a well-defined gap thickness and is a robust platform for analyzing gap plasmon modes.
김정호,이주복,박세환,서창원,윤석준,한강희,김정용,이영희,이현석 한국물리학회 2022 Current Applied Physics Vol.33 No.-
Transition metal dichalcogenide (TMD) monolayers, such as MoS2, possess a direct optical bandgap are useful for emerging ultrathin optoelectronics in the visible light range, whereas their thin thickness limits light absorption and emission properties. To address this drawback, one promising approach is to hybridize plasmonic nanostructures with monolayer TMDs to utilize local field enhancement effects owing to localized surface plasmon resonance (LSPR). Herein, we propose a strong enhancement of the local light–matter interaction in MoS2 monolayers on naturally generated nanoscale grooves. The nanogrooves are formed at grain boundaries (GBs) of template-stripped metal film substrates that are fabricated by mechanically stripping Ag films deposited on an ultra-flat Si substrate, wherein the nanogroove densities are systematically modulated by the Ag film thickness. We observe an effective photoluminescence enhancement factor of 758 and a Raman spectroscopy intensity enhancement of approximately 5 times in MoS2 on the subwavelength-scale nanogrooves, compared with that on grain planes, which is attributed to a strong local field enhancement of the LSPR effect. Moreover, this plasmonic enhancement effect is elucidated by dark-field scattering spectroscopy and optical simulations. Our results can facilitate the utilization of density-controllable plasmonic nanogrooves synthesized without nanopatterning techniques for plasmonic hybrids on 2D semiconductors.
비알코올성 지방간 질환에 대한 침치료의 효과 : 체계적 고찰
현준,이주복,김소연,한창우 대한한방내과학회 2018 大韓韓方內科學會誌 Vol.39 No.6
Purpose: This systematic review was planned and performed in order to determine the clinical effectiveness of acupuncture for non-alcoholic fatty liver disease (NAFLD). Methods: We searched related randomized controlled trials in several medical online databases, including China National Knowledge Infrastructure (CNKI), Excerpta Medica dataBASE (EMBASE), Public/Publisher MEDLINE (PubMed), Cochrane Central Register of Controlled Trials (CENTRAL), National Digital Science Library (NDSL), and Research Information Sharing Service (RISS). NAFLD related outcomes were extracted from the included trials and meta-analyzed. Results: From the 8 included trials, the values of the following examinations were extracted: liver ultrasonography, liver CT, body fat CT, aspartate transaminase (AST), alanine transaminase (ALT), gamma-glutamyltransferase (GGT), total cholesterol (TC), triglyceride (TG), low density lipoprotein (LDL) cholesterol, high density lipoprotein (HDL) cholesterol, fasting blood sugar (FBS), hosmeostatic model assessment for insulin resistance (HOMA-IR), weight, body mass index (BMI), waist hip ratio (WHR), obesity degree, body fat mass, body fat rate, leptin, malondialdehyde (MDA), and super oxide dismutase (SOD). In the 4 outcomes, cure rate in liver ultrasonography (RR=1.56; 95%CI=1.05~2.31; P=0.03), cure rate in liver CT (RR=2.23; 95%CI=1.33~3.72; P=0.002), TC (MD=-0.78; 95%CI=-1.41~-0.15; P=0.02), and TG (MD=-2.05; 95%CI= -3.88~-0.21; P=0.03), acupuncture was more effective than the control intervention. Conclusions: In this meta-analysis, acupuncture relieved hepatic steatosis, and reduced TC, and TG in NAFLD patients. more well-planned studies are still needed due to the heterogeneity and the considerable methodological flaws in the analyzed trials.
서창원,박경철,이주복,이창연,김정용 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
금속-유기골격구조체(MOFs)는 금속 클러스터와 유기 연결체로 구성되는 결정성 화합물로 다공성, 다양한 화학적 성질, 넓은 표면 영역을 가지고 있다. 이러한 금속 유기골격구조체의 특징 때문에 가스 저장체, 촉매 재료, 센서와 같은 다양한 응용 분야에서 연구가 이뤄지고 있다. NU-1000 은 Zr<sup>6</sup> 기반 파이렌 리간드로 구성되어 있는 금속유기골격구조체이다. 우리는 NU-1000 금속유기골격구조체의 파이렌 리간드를 포르피린 리간드로 치환하여 혼합 리간드를 갖는 금속유기골격구조체의 에너지 전이를 분석하였다. 파이렌에서 포르피린으로 에너지 전이는 공초점 현미경을 이용한 시간분해발광 스펙트럼을 이용해 분석했다. 이 연구를 통해서 NU-1000 구조체에서 파이렌과 포르피린의 결합 비율에 따른 에너지 전이 차이가 나타나는 것을 확인했다. 이를 통해 에너지 전이를 이용한 광촉매 재료로 사용이 가능할 것으로 보인다.