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Toxic gas detection using SnO₂ porous nanowires
Si-Hyung Lim(임시형),Hong Jae Yim(임홍재),Sosoon Park(박소순),Sumit Barthwal,Dongho Kim(김동호) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
A gas sensor using SnO₂ porous nanowires as sensing materials was designed to detect toxic gases such as CO, NO₂ and NH₃. The SnO₂ porous nanowires were chemically synthesized using hydrothermal methods. The MEMS sensor platform including a microheater and sensing electrodes was fabricated using conventional semiconductor fabrication processes. A spin coating technique was used for the coating of SnO₂ porous nanowires on top of the sensing electrodes. The ~ ppm level concentration and < 10 s level response/recovery time were demonstrated using the developed gas sensing platform.
공진점변화검출용 QCM 센싱플랫폼을 이용한 폭발물 특이적 바이오수용체 성능평가
임시형(Lim, Si-Hyung),정현진(Jeong, Hyun-Jin) 한국소음진동공학회 2011 한국소음진동공학회 논문집 Vol.21 No.3
The mass change during the molecular interaction between explosive specific bio-receptors and target molecules has been measured using quartz crystal microbalance(QCM), which has a mass change detection limit up to ~ng/$cm^2$. The environmental effect on the molecular interaction has been evaluated. In the liquid phase molecular interaction experiments, the high selectivity of the bio-receptor to DNT compared with toluene has been shown and the sensitivity for various concentrations of DNT has been demonstrated.
임시형(Si-Hyung Lim),임홍재(Hong Jae Yim),아룬 마줌다(Arun Majumdar) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Understanding the interactions between aromatic gas molecules and various simple aromatic receptor molecules is important in developing selective receptors for volatile organic compounds (VOCs). Here, five benzene thiols with different functional end groups were used to investigate the weak binding of aromatic vapors like dinitrotolouene (DNT) and toluene. A multiplexed microcantilever array in conjunction with a very low concentration vapor generation system was developed to study multiple receptor-target interactions simultaneously. Differential nanomechanical responses of such devices provided insight about the influence of various chemical and structural features of such molecules.
Biotransformation of Monoterpenes by Mentha piperita Suspension Culture
Si Hyung Park,Yoong Ho Lim,Soo Un Kim 한국응용생명화학회 1993 식물생장과 환경 Vol.- No.-
The metabolic capability of the cultured cells of peppermint was tested by feeding appropriate exogenous substrates to the suspension cultures. Conversion of (-)-limonene into any other monoterpenes was not observed with suspension cultures. (+)-Pulegone was converted into (+)-isomenthone and (-)-menthone, and (-)-menthone into (-)-menthol. (-)-Isopiperitenone was transformed into new monoterpense as well as (+)-pulegone and piperitenone. Structure of one of the new monoterpenes, (-)-7-hydroxyisopiperitenone, was identified by 2D-NMR, HRMS, IR and UV-Vis. Structural evidence of the other minor new monoterpenes, (6R)- and (6S)-6-hydroxyisopiperitenone is presented. The experiments confirmed that the suspension retained most of the menthol biosynthesis pathway in the cell, but its enzyme activities were low and different at branching point compared to that of field grown peppermint.