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나원휘,유재천 한국센서학회 2013 센서학회지 Vol.22 No.1
In this paper, we proposed a laser-based non-contact temperature measuring method for high speed rotating polycarbonate (PC) disk using transparency change of thermocolor. The thermocolor has abilities to change color and transparency due to a change in temperature. The thermocolor is applied on one side of polyvinylidene fluoride (PVDF) membrane. The thermocolor applied membrane is attached to inside of reaction chamber in disk. An optical system consisted of a laser beam radiator and a laser photometer is installed. Laser is irradiated at the bottom side of disk and the transmitted laser beam is detected by the laser photometer at the opposite side of disk. During the disk is rotating, laser is irradiated and detected simultaneously. The laser photometer senses the transmitted laser power and generates voltage as output. The temperature of disk can be detected during the disk is rotating up to 3000 RPM.
Surface plasmon remonance based single-walled carbon nanotube detection
Won-Hwi Na(나원휘),Dae-Ho Jang(장대호),Nam-jun Kim(김남준),Se-Hyun Shin(신세현) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
In this study, we developed detection method of single-walled carbon nanotubes (SWNTs) in an aqueous solution using surface plasmon resonance (SPR) spectroscopy. A strong affinity conjugation with biotin-streptavidin was adopted for a sensitive and specific detection on a sensing mechanism. During the pretreatment process, the SWNT surface was functionalized and hydrophilized using a thymine-chain based biotinylated single-strand DNA linker. In addition, bovine serum albumin was added to enhance the degree of dispersion of SWNT. The pretreated SWNTs were captured on a sensing sensor chip surface by streptavidins immobilized on biotilylated gold sensing film. The captured SWNTs were measured in real-time using SPR spectroscopy. By our detection method using SPR sensor, we achieved the limit of detection as 100 fg/ml and the SPR sensor showed a linear characteristic within the range of 100 pg/ml to 200 ng/ml.