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광주지역 신축아파트의 휘발성유기화합물 및 카보닐화합물 특성에 관한 연구
김환기(Hwangi Kim),안상수(Sangsu Ahn),박옥현(Okhyun Park),김민진(Minjin Kim),이우진(Woojin Lee),박세일(Seil Park),배석진(Seokjin Bae),서광엽(Gwangyeob Seo) 한국생활환경학회 2021 한국생활환경학회지 Vol.28 No.2
Numerous volatile organic compounds are generated in new apartments. Only six volatile substances are regulated under the Indoor Air Quality Management Act for new apartments. Various other substances are not regulated despite their potential health risks. We investigated 43 types of volatile organic compounds and 7 types of carbonyl compounds which are representative indoor environmental pollutants in new apartments, and 21 types of pollutants were detected. Of the 21 types detected, 91.6 percent accounted for the majority of the 7 species with high concentrations. These seven typical indoor pollutants include regulators Toluene, Formaldehyde, Ethyl-benzene, Xylene, and Styrene, as well as unregulated substances Acetone and Acetaldehyde. The correlation analysis among seven volatile organic compounds was investigated. For the correlation of seven species, the strongest positive correlation between Ethyl-benzene and Styrene r=.933 (p=.001) appeared, and a coefficient of determination(r) between other species was greater than 0.7. This correlation coefficient values indicated that several volatile organic compounds released from the same pollutant sources. Additionally the concentration reduction rate of volatile organic compounds was measured to examine the Bakeout effect. The reduction rate scored as Toluene 85.5%, Xylene 84.7%, Ethyl-benzene 84.4%, Styrene 76.8%, Acetone 73.4%, Acetaldehyde 71.0%, and Formaldehyde 70.9% respectively.
Hazardous and Noxious Substances 현장탐지용 수질센서의 기술 현황
이창한(Changhan Lee),안상수(Sangsu Ahn),노재하(Jaeha Noh),장지호(Jiho Chang),서동민(Dongmin Seo),이문진(Moonjin Lee) 한국해양환경·에너지학회 2021 한국해양환경·에너지학회 학술대회논문집 Vol.2021 No.10
Hazardous Noxious Sustances (HNS) 해양배출 현장탐지 기술개발을 위하여 환경센서를 중심으로 한 수질 검출 센서 기술의 현황을 조사하였다. 수질 관리는 어느 국가에서나 매우 중요한 과제로 우리나라에서도 지속적으로 관계법령 정비와 시설 투자가 이루어져왔다. 국내에서는 2004년 TMS관리계획을 수립하여 2020년 현재, 984개소 수질TMS 관제센터가 구축되어 수질관제시스템이 작동 중이다. 현재 수질 TMS측정항목은 화학적 산소요구량(COD) 또는 총유기탄수소(TOC), 부유물질량(SS), 총질소(T-N), 총인(T-P), 수소이온농도(pH) 등으로 특히 2020년부터 수질자동측정기기 측정항목이 COD에서 TOC 변경되었다. 하지만 해양으로의 HNS 배출은 원칙적으로 금지되어 있음에도 현실에서 이를 규제할 방안은 미흡하다. 이런 문제를 해결하기 위하여 여러 가지 검토와 법규정 정비가 선행되어야 할 뿐만 아니라 규제대상 특정 HNS에 대한 직접적인 측정과 실시간 데이터 취득에 이용할 새로운 센서 기술에 대한 제안도 중요하다. 본 연구에서는 이러한 목적을 달성하기 위하여 해양산업시설의 탐방, 지적재산권 조사, 학술연구 결과 조사를 통해서 HNS 해양배출시설에 적합한 수질센서에 요구되는 성능과 기술을 탐색하였다. Water quality detection sensor technologies focused on on-site detection technologies have been investigated. Water quality management is a very important task in any country, hence, continuous improvements also has been made on the facilities, laws and regulations. In Korea, a telemonitoring system (TMS) management plan was established in 2004, and now, 984 water quality TMS control centers have been established and are operating now. Current water quality TMS measurement items are including chemical oxygen demand (COD) or total organic carbon (TOC), suspended solids (SS), total nitrogen (T-N), total phosphorus (T-P), and hydrogen ion concentration (pH). Note that, from 2020, the measurement item has been changed from COD to TOC. Although HNS discharge into the sea is prohibited in principle, however, regulation is insufficient in reality. In order to solve this discrimination, various researches and revision of laws and regulations should be preceded. In addition, it is important to research a new sensor technology for direct measurement of regulated HNS and real-time data acquisition too. In this study, the performance and technology required for a water quality sensor suitable for offshore discharge facilities were explored through exploration of marine discharge facilities, intellectual property rights investigations, and academic research results.
Carbon Nanotube Film을 이용한 액체 전기화학 센서
노재하 ( Jaeha Noh ),안상수 ( Sangsu An ),이창한 ( Changhan Lee ),이상태 ( Sangtae Lee ),이문진 ( Moonjin Lee ),서동민 ( Dongmin Seo ),장지호 ( Jiho Chang ) 한국센서학회 2021 센서학회지 Vol.30 No.4
We studied electrochemical sensors using printed carbon nanotube (CNT) film on a polyethylene terephthalate (PET) substrate. Multiwalled CNT films were printed on a PET substrate to study its feasibility as hazardous and noxious substances (HNS) detection sensor. The printed CNT film (PCF) with a 50 μm thickness exhibited a specific resistance of 230 ohm. To determine the optimum sensor structure, a resistance-type PCF sensor (R-type PCF sensor) and a conductive-type PCF sensor (C-type PCF sensor) were fabricated and compared using diluted NH3 droplets with various concentrations. The response magnitude, response time, sensitivity, linearity, and limit of detection (LOD) were compared, and it was concluded that the C-type PCF sensor exhibited superior performance. By applying a C-Type PCF sensor, we confirmed the detection performance of 12 types of floating HNS and the response of the sensor with selectivity according to the degree of polarity.
표면저항형 ITO 필름 센서의 표면처리 공정에 관한 연구
김동준(Dongjun Kim),안상수(Sangsu An),이창한(Changhan Lee),조영지(Youngji Cho),한민철(Mincheol Han),배찬영(Chanyoung Bae),전준수(Junsu Jeon),송유진(Yujin Song),장지호(Jiho Chang),하윤수(Yun-Su Ha),박재진(Jae-Jin Park),이문진(Moonjin Lee 한국물리학회 2024 새물리 Vol.74 No.1
표면저항의 변화를 이용하여 수중 유해화학물질 농도를 측정할 수 있는 센서를 금속산화물 나노입자 필름을 이용하여 제작하고 표면처리 공정에 의한 센서 성능의 변화를 연구하였다. 필름 인쇄에 사용한 유기 바인더의 표면 잔류에 의한 영향에 주목하여 필름과 센서의 물성 변화를 관찰하였다. 잔류 바인더를 제거하기 위하여 기존의 소결 공정에 세척 공정을 추가로 도입하여 세척 시간에 따른 ITO:CB 필름의 물성 변화를 관찰하였고, 표면처리 시간을 최적화하였다. 세척 시간을 증가시킴에 따라 센서 응답이 개선됨을 확인하였고 양호한 센서 동작을 확보하기 위한 최적의 표면처리 조건을 결정하였다. A sensor that can measure the concentration of harmful chemicals in water using changes in surface resistance was fabricated using a metal oxide nanoparticle film, and the changes in sensor performance due to surface treatment processes were investigated. The influence of the surface residue of the organic binder used for film printing was focused on, and the changes in the properties of the film and sensor were observed. To remove the residual binder, a cleaning process was additionally introduced to the existing sintering process, and the changes in the properties of the ITO:CB film were observed according to the cleaning time, and the surface treatment time was optimized. It was confirmed that the sensor response improved as the cleaning time increased, and the optimal surface treatment conditions were determined to ensure good sensor operation.
ITO 나노입자 필름을 이용한 수중 금속이온 검출 센서에 대한 연구
전준수(Junsu Jeon),안상수(Sangsu An),이창한(Changhan Lee),조영지(Youngji Cho),배찬영(Chanyoung Bae),김동준(Dongjun Kim),송유진(Yujin Song),한민철(Mincheol Han),장지호(Jiho Chang),하윤수(Yunsu Ha),박재진(Jaejin Park),이문진(Moonjin Lee) 한국물리학회 2024 새물리 Vol.74 No.1
수중 중금속을 검출에 활용하기 위해 ITO(Indium Tin Oxide) 나노입자를 이용한 필름을 제작하고, 이를 이용한 화학저항형 (chemoresistive) 센서를 제작하여 금속이온 검출 성능을 확인하였다. ITO 필름은 나노입자와 유기바인더를 혼합하여 paste를 제작하고 PET 기판 위에 인쇄하여 제작하였다. 제작한 필름 양단에 Ag 전극을 형성하여 센서를 제작하였고, 5가지 (Mn, Zn, Se, Sn, Ni) 금속이온 수용액을 이용하여 센서의 검출 특성을 확인하였다. 금속이온의 농도 증가에 따른 센서의 저항은 선형적으로 증가하였으며, 농도와 저항이 선형적 변화 관계를 가짐을 확인하였다. 센서의 성능을 센서의 응답 (ΔR), 검출하한 (Limit of Detection), 응답시간 (response time), 선형성, 오차 (error), 검출범위 등을 이용하여 평가하였다. In order to use heavy metals in water for detection, a film using ITO (Indium Tin Oxide) nanoparticles was produced, and a chemoresistive sensor was produced using it to confirm the metal ion detection performance. The ITO film was produced by mixing nanoparticles and organic binders to produce paste and printing it on a PET substrate. The sensor was manufactured by forming Ag electrodes on both ends of the manufactured film, and the detection characteristics of the sensor were confirmed using five (Mn, Zn, Se, Sn, Ni) metal ion aqueous solutions. It was verified that the sensor resistance linearly increased according to the increase in the concentration of the metal ion, and that the concentration and resistance change linearly. The sensor’s performance was evaluated using the sensor’s response (ΔR), limit of detection, response time, linearity, error, and detection range.