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박범준,김수헌,곽철환,Kugalur Ranjith Shanmugam,한영규,조영진,허윤석 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.97 No.-
In this work, we fabricate porous cesium lead bromide nanofibers (CsPbBr3 NFs) via electrospinning andemploy them in a sensor to effectively detect both gaseous and aqueous ammonia. The CsPbBr3 NFs areproduced byfirst mixing cesium lead bromide nanocrystals (CsPbBr3 NCs) with polystyrene (PS),followed by solidifying the mixture into NFs using electrospinning. Porous NFs are modified using thevolatile solvent toluene, which is volatilized during the electrospinning process. The applicability of theproposed CsPbBr3 NFs for use under various environmental conditions is verified by analyzing theirstability in response to changes in temperature, moisture level and pH, which are critical drawbacks ofCsPbBr3 NCs. Gaseous ammonia (9 mg L 1) in an N2 carrier is subsequently detected using thephotoluminescence (PL) properties of the CsPbBr3 NFs. In addition, an ammonia concentration of 100.0mg L 1 in an aqueous solution can be detected using the PL intensity. Therefore, we believe that theproposed CsPbBr3 NFs show significant promise for use in detection sensors to assess the extent of fooddecay, allowing customers to purchase fresh agricultural products more safely.
Random primer를 이용한 Listeria spp. 분석조건의 최적화
박범준 울산과학대학 2005 연구논문집 Vol.31 No.2
RP-13은 GC%가 70%이므로 계산상으로는 annealing 온도가 34℃이다. 32∼36℃까지 다섯 가지의 온도로 annealing한 결과 L. monocytogenes만이 갖는 특정한 크기의 band가 역시 34℃에서 형성됨을 알아냈고, 34℃를 annealing 온도로 정하였다. Line 1부터 4까지 L. monocytogenes ATCC15313, 19111, 19112, 19113은 2개의 700 bp와 1500 bp band를 형성하였고 그 밖의 Listeria spp.들 Line 6부터 11까지 L. ivanovii ATCC19119, L. grayi ATCC19120, L. murrayi ATCC25401, L. innocua ATCC33090, L. welshimeri ATCC35897, L. seeligeri ATCC35967은 약 2000∼2300 bp크기 한 개의 band를 보여 병원성 균과 비병원성 균이 매우 확실하게 구분되는 band pattern을 보임으로써 RP-13을 이용한 PCR 조건이 Listeria spp.를 분석하기 위한 최적조건이다. In this study, random primer RP-13(5'-CTCTCCGCCA-3') was used to generate PCR for detection of pathogenic L. monocytogenes of Listeria spp. Among 20 random primers tested, RP-13 showed on acceptable result for the differentiation of a pathogenic Listeria from non-pathogenic microorganisms. Pathogenic Listeria, L. monocytogenes(ATCC 15313, 19111, 19112, 19113) showed two bands for 700bp and 1500bp while non-pathogenic bacteria, L. ivanovii, L. grayi, L. murrayi, L. innocua, L. welshimeri, and L. seeligeri had only one band sizing from 2000 to 2300bp.
Effectiveness of parylene coating on CdZnTe surface after optimal passivation
박범준,김용훈,서지원,김기현 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.12
Parylene coating was adopted on CdZnTe (CZT) detector as a mechanical protection layer after wet passivation with hydrogen peroxide (H2O2) and ammonium fluoride (NH4F). Wet chemical passivant lose their effectiveness when exposed to the ambient conditions for a long time. Parylene coating could protect the effectiveness of passivation, by mechanically blocking the exposure to the ambient conditions. Stability of CZT detector was tested with the measurement of leakage current density and response to radio-isotopes. When the enough thickness of parylene (>100 mm) is adopted, parylene is a promising protection layer thereby ensuring the performance and long-term stability of CZT detectors.