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Smartphone compatible on-site fluorescence analyzer for spilled crude oil based on CMOS image sensor
Seo, Dongmin,Oh, Sangwoo,Shin, Sanghoon,Lee, Moonjin,Hwang, Yongha,Seo, Sungkyu Elsevier 2019 Sensors and actuators. B Chemical Vol.289 No.-
<P><B>Abstract</B></P> <P>Oil spills, both in the ocean and inland waters, have negative effects such as mass mortality and habitat destruction. In this study, we develop a spilled oil point-of-testing device (SOPD), a field measurement system for immediate on-site fluorescence monitoring of oil concentrations. Photodetectors, such as photodiodes and photo multiplier tubes, which are commonly used in existing instrumentation, have inherent limitations because they are capable of only single-pixel detection. However, SOPD can cope with environmental noise caused by dust, dirt, and impurities, by adopting a multi-mega pixel complementary metal-oxide semiconductor image sensor as a detector. Furthermore, the manufacturing cost is remarkably reduced by a simple optical configuration using only two light-emitting diode light sources, five optical lenses, and a CMOS sensor. SOPD can quantitatively analyze fluorescence intensities at both low (0–1 ppm) and high (1–800 ppm) concentrations in marine and inland environments, respectively. The performance of the equipment reported in this paper was demonstrated by measuring the linear measurement range and the limit of detection using five different kinds of crude oil. A correlation analysis of crude oil samples having different collection dates was also completed. In addition, SOPD has been developed as a remote system that can be operated and analyzed on a smartphone, thereby enhancing user convenience, reducing analysis time, and simplifying device.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We developed a spilled oil point-of-testing device (SOPD) using a CMOS image sensor as a detector. </LI> <LI> Detection ranges of SOPD are from several ppb to several hundred ppm level, showing its high dynamic range. </LI> <LI> Equipped with a multi-million-pixel image sensor, SOPD shows great noise-proof fluorescence detection compared to the PMT based detectors. </LI> <LI> SOPD can analyze the captured image within a smartphone, thereby improving user convenience with minimized analysis time. </LI> <LI> SOPD holds great promise in various chemical and biological fluorescence detection applications. </LI> </UL> </P>
Infrared Conductivity of PED-grown (La,Ba)SnO3 Thin Films
Dongmin Seo,Kwangnam Yu,최은지 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.64 No.5
We have synthesized La-doped BaSnO3 thin films on SrTiO3 substrates by using the pulsedelectron deposition technique. By performing reflection/transmission measurements on the filmsand a Drude model analysis of the data, we determined the carrier density n = 6.7 × 1019 cm−3and the room-temperature mobility μ = 17 cm2V−1s−1 of the conducting electrons. The standardDrude optical conductivity of the films demonstrates that the electron correlation effect is minimalin the present transparent conducting oxide material.