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LABEL-FREE BIOMOLECULAR DETECTION USING CARBON NANOTUBE FIELD EFFECT TRANSISTORS
변혜령,SUPHIL KIM,HEE CHEUL CHOI 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2008 NANO Vol.3 No.6
Carbon nanotube field effect transistor (FET) type biosensors have been widely investigated as one of the promising platforms for highly sensitive personalized disease-monitoring electronic devices. Combined with high level cutting edge information technology (IT) infra systems, carbon nanotube transistor biosensors afford a great opportunity to contribute to human disease care by providing early diagnostic capability. Several key prerequisites that should be clarified for the real application include sensitivity, reliability, reproducibility, and expandability to multiplex detection systems. In this brief review, we introduce the types, fabrication, and detection methods of single-walled carbon nanotube FET (SWNT-FET) devices. As surface functionalization of the devices by which nonspecific bindings (NSBs) are efficiently prohibited is also another important issue regarding reliable biosensors, we discuss several key strategies about surface passivation along with examples of various biomoleculessuch as proteins, DNA, small molecules, aptamers, viruses, and cancer and neurodegenerative disease markers which have been successfully sensed by SWNT-FET devices. Finally, we discuss proposed detection mechanisms, according to which strategies for fabricating sensor devices having high sensitivity are determined. Two main mechanisms — charge transfer (or electrostatic gate effect) and Schottky barrier effect, depending on the place where biomolecules are adsorbed — will be covered.
Designing Redox-Stable Cobalt-Polypyridyl Complexes for Redox Flow Batteries
변혜령,( Chunzhen Yang ),( Goergiog Nikiforidis ),박지영,최종훈,( Yong Luo ),( Liang Zhang ),( Shi-cheng Wang ),( Yi-tsu Chan ),( Zhaomin Hou ),백무현,이윤호 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
We developed rational strategies for exploiting two common principles in organometallic chemistry for enhancing the robustness of pseudo-octahedral Co-polypyridyl complexes. Namely, the spin-crossover between low and high-spin states and the chelation effect emerging from replacing three bidentate ligands with two tridentate analogues. Quantum chemical models are used to conceptualize our approach and make predictions that are tested against experiments by preparing prototype Co-complexes and profiling them as catholytes and anolytes. In good agreement with the conceptual predictions, very stable cycling performance over 600 charge cycles is found.
Effect of an InGaP Spacer Layer on the Luminescence Properties of InP/InGaP Quantum Structures
변혜령,류미이,송진동,이창렬 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.5
The optical characteristics of InP/InGaP quantum structures (QSs; quantum dots + quantumdashes) grown by using a migration enhanced epitaxy method have been investigated usingtemperature-dependent photoluminescence (PL) and time-resolved PL (TRPL). An InGaP spacerlayer with different thicknesses (15, 30, and 50 nm) was grown on the InP QSs in order to identifythe effect of the InGaP spacer layer on the luminescence and the carrier dynamics of InP QSs. Asthe thickness of the InGaP layer was increased from 15 to 50 nm, the PL peak exhibited a blueshift,and the PL intensity increased, which are attributed to the increased carrier confinement inthe vertical direction due to the increased height and reduced width and length of QSs. The PLdecay time demonstrated a strong dependence on the emission wavelength and the temperature. Inaddition, the decay time for InP QS samples with InGaP layers of 30 and 50 nm exhibited differentemission-wavelength dependence than that for the InP QS sample with an InGaP layer of 15 nm. These results demonstrate that the optical and the structural properties of InP QSs are significantlyaffected by varying the thickness of the InGaP spacer layer.
변혜령,Hyunseob Lim,Hyun Jae Song,최희철 대한화학회 2007 Bulletin of the Korean Chemical Society Vol.28 No.11
A successful combination of oxygen-assisted chemical vapor deposition (CVD) process and Co catalyst nanoparticles to grow highly pure single walled carbon nanotubes (SWNTs) was demonstrated. Recently, it was reported that addition of small amounts of oxygen during CVD process dramatically increased the purity and yield of carbon nanotubes. However, this strategy could not be applied for discrete Fe nanoparticle catalysts from which appropriate yields of SWNTs could be grown directly on solid substrates, and fabricated into field effect transistors (FETs) quite efficiently. The main reason for this failure is due to the carbothermal reduction which results in SiO2 nanotrench formation. We found that the oxygen-assisted CVD process could be successfully applied for the growth of highly pure SWNTs by switching the catalyst from Fe to Co nanoparticles. The topological morphologies and p-type transistor electrical transport properties of the grown SWNTs were examined by using atomic force microscope (AFM), Raman, and from FET devices fabricated by photolithography.
변혜령,윤영선,Byun Hea-Ryung,Yoon Young-Sun 한국주거학회 2005 한국주거학회 논문집 Vol.16 No.5
The purpose of this study was to analyze environment-behavior concepts included in environmental design characteristics of facilities for elderly with dementia. Major method was contents analysis of actual environmental designs. For comparison between the environment-behavior concepts and actual cases, an analytical framework was developed. Eleven cases of facilities designed for people with dementia were analyzed. Those were published ones in periodicals in USA. The analytical data used included floor plans, texts, and visual materials including photographs. Under the framework for analysis, a total of 296 criteria were used to analyze the actual cases of environmental design. This study was expected to offer a knowledge base for better environmental design for elderly with dementia and to help establish guidelines for designing such facilities which can meet the cultural characteristics and traditional conditions of Korea.