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JOURNAL OF SENSOR SCIENCE AND TECHNOLOGY

  • : 한국센서학회
  • : 공학분야  >  전기공학
  • : KCI등재
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  • : 1225-5475
  • : 2093-7563
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수록정보
수록범위 : 1권1호(1992)~30권6호(2021) |수록논문 수 : 1,892
센서학회지
30권6호(2021년 11월) 수록논문
최근 권호 논문
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KCI등재

1Selective acetate detection using functional carbon nanotube fiber

저자 : Seung-ho Choi , Joon-seok Lee , Won-jun Choi , Sungju Lee , Hyeon Su Jeong , Seon-jin Choi

발행기관 : 한국센서학회 간행물 : 센서학회지 30권 6호 발행 연도 : 2021 페이지 : pp. 357-363 (7 pages)

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We developed a chemiresistive anion sensor using highly conductive carbon nanotube fibers (CNTFs) functionalized with anion receptors. Mechanically robust CNTFs were prepared via wet-spinning utilizing the nematic liquid crystal properties of CNTs in chlorosulfonic acid (CSA). For anion detection, polymeric receptors composed of dual-hydrogen bond donors, including thiourea 1, squaramide 2, and croconamide 3, were prepared and bonded non-covalently on the surface of the CNTFs. The binding affinities of the anion receptors were studied using UV-vis titrations. The results revealed that squaramide 2 exhibited the highest binding affinity toward AcO¯, followed by thiourea 1 and croconamide 3. This trend was consistent with the chemiresistive sensing responses toward AcO¯ using functional CNTFs. Selective anion sensing properties were observed that CNTFs functionalized with squaramide 2 exhibited a response of 1.08% toward 33.33 mM AcO¯, while negligible responses (<0.1%) were observed for other anions such as Cl¯, Br¯, and NO₃¯. The improved response was attributed to the internal charge transfer of dual-hydrogen bond donors owing to the deprotonation of the receptor upon the addition of AcO¯.

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2Micropower energy harvesting using high-efficiency indoor organic photovoltaics for self-powered sensor systems

저자 : Swarup Biswas , Yongju Lee , Hyeok Kim

발행기관 : 한국센서학회 간행물 : 센서학회지 30권 6호 발행 연도 : 2021 페이지 : pp. 364-368 (5 pages)

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We developed a highly efficient organic photovoltaic (OPV) cell with a poly[4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b;4,5- b']dithiophene-2,6-diyl-alt-(4-(2-ethylhexyl)-3-fluorothieno[3,4-b]thiophene-)-2-carboxylate-2-6-diyl)]:[6,6]-phenyl-C71-butyric acid methyl ester active layer for harvesting lower-intensity indoor light energy to power various self-powered sensor systems that require power in the microwatt range. In order to achieve higher power conversion efficiency (PCE), we first optimized the thickness of the active layer of the OPV cell through optical simulations. Next, we fabricated an OPV cell with optimized active layer thickness. The device exhibited a PCE of 12.23%, open circuit voltage of 0.66 V, short-circuit current density of 97.7 μA/㎠, and fill factor of 60.53%. Furthermore, the device showed a maximum power density of 45 μW/㎠, which is suitable for powering a low-power (microwatt range) sensor system.

KCI등재

3Metal-organic frameworks-driven ZnO-functionalized carbon nanotube fiber for NO2 sensor

저자 : Sungyoon Woo , Mingyeong Jo , Joon-seok Lee , Seung-ho Choi , Sungju Lee , Hyeon Su Jeong , Seon-jin Choi

발행기관 : 한국센서학회 간행물 : 센서학회지 30권 6호 발행 연도 : 2021 페이지 : pp. 369-375 (7 pages)

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In this study, heterogeneous ZnO/CNTF composites were developed to improve the NO2-sensing response, facilitated by the selfheating property. Highly conductive and mechanically stable CNTFs were prepared by a wet-spinning process assisted by the liquid crystal (LC) behavior of CNTs. Metal-organic frameworks (MOFs) of ZIF-8 were precipitated on the surface of the CNTF (ZIF-8/ CNTF) via one-pot synthesis in solution. The subsequent calcination process resulted in the formation of the ZnO/CNTF composites. The calcination temperatures were controlled at 400, 500, and 600℃ in an N2 atmosphere to confirm the evolution of the microstructures and NO2-sensing properties. Gas sensor characterization was performed at 100℃ by applying a DC voltage to induce Joule heating through the CNTF. The results revealed that the ZnO/CNTF composite after calcination at 500℃ (ZnO/CNTF-500) exhibited an improved response (Rair/Rgas = 1.086) toward 20 ppm NO2 as compared to the pristine CNTF (Rair/Rgas = 1.063). Selective NO2-sensing properties were demonstrated with negligible responses toward interfering gas species such as H2S, NH3, CO, and toluene. Our approach for the synthesis of MOF-driven ZnO/CNTF composites can provide a new strategy for the fabrication of wearable gas sensors integrated with textile materials.

KCI등재

4D-space-controlled graphene oxide hybrid membrane-loaded SnO2 nanosheets for selective H2 detection

저자 : Ji-won Jung , Ji-soo Jang

발행기관 : 한국센서학회 간행물 : 센서학회지 30권 6호 발행 연도 : 2021 페이지 : pp. 376-380 (5 pages)

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The accurate detection of hydrogen gas molecules is considered to be important for industrial safety. However, the selective detection of the gas using semiconductive metal oxides (SMOs)-based sensors is challenging. Here, we describe the fabrication of H2 sensors in which a nanocellulose/graphene oxide (GO) hybrid membrane is attached to SnO2 nanosheets (NSs). One-dimensional (1D) nanocellulose fibrils are attached to the surface of GO NSs (GONC membrane) by mixing GO and nanocellulose in a solution. The as-prepared GONC membrane is employed as a sacrificial template for SnO2 NSs as well as a molecular sieving membrane for selective H2 filtration. The combination of GONC membrane and SnO2 NSs showed substantial selectivity to hydrogen gas (Rair / Rgas > 10 @ 0.8 % H2, 100 ℃) with noise level responses to interfering gases (H2S, CO, CH3COCH3, C2H5OH, and NO2). These remarkable sensing results are attributed mainly to the molecular sieving effect of the GONC membrane. These results can facilitate the development of a highly selective H2 detector using SMO sensors.

KCI등재

5금속 산화물 가스 센서의 광 활성화 센싱 메커니즘

저자 : 엄완식 ( Wansik Oum ) , 신가윤 ( Ka Yoon Shin ) , 유동재 ( Dong Jae Yu ) , 강석우 ( Sukwoo Kang ) , 김은비 ( Eun Bi Kim ) , 김현우 ( Hyoun Woo Kim )

발행기관 : 한국센서학회 간행물 : 센서학회지 30권 6호 발행 연도 : 2021 페이지 : pp. 381-383 (3 pages)

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Light-activated metal oxide gas sensors have been investigated in recent decades. Light illumination enhances the sensing attributes, including the operational temperature, sensitivity, and selectivity. Unfortunately, high operating temperature is a major problem for gas sensors because of the huge energy consumption. Therefore, the importance of light-activated room-temperature sensing has increased. This paper reviews recent light-activated sensors and their sensing mechanisms with a specific focus on metal oxide gas sensors. Studies use the outstanding ZnO and SnO2 sensors to research photoactivation when illuminated by various sources such as ultraviolet (UV), halogen lamp, or monochromatic light. Photon induction generates electron-hole pairs that increase the number of adsorption sites of gas molecules and ions improving the sensor's sensing properties.

KCI등재

6순환 전압전류법의 기초

저자 : 신가윤 ( Ka Yoon Shin ) , 엄완식 ( Wansik Oum ) , 유동재 ( Dong Jae Yu ) , 강석우 ( Sukwoo Kang ) , 김은비 ( Eun Bi Kim ) , 김현우 ( Hyoun Woo Kim )

발행기관 : 한국센서학회 간행물 : 센서학회지 30권 6호 발행 연도 : 2021 페이지 : pp. 384-387 (4 pages)

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Cyclic voltammetry (CV) is a powerful electrochemical measurement technique that can determine redoxable substances in a solution. The advantage of CV is that we can observe redox behavior over a wide potential range in a short time. Because of its practicality and versatility, CV is used not only in electrochemistry but also in various fields of chemistry, such as inorganic chemistry, organic chemistry, and biochemistry. As technology advances and the popularity of CV grows, the need for trained electrochemists also increases. However, most students do not receive formal training in these technologies as part of their curriculum. There are few concise and accessible resources for learning CV. Therefore, this manuscript provides a brief introduction to cyclic voltammetry to aid readers in collecting and interpreting useful data from cyclic voltammograms.

KCI등재

73D 프린팅 센서 연구 동향 소개-전왜성 변형/로드셀 센서 중심으로

저자 : 조정훈 ( Jeong Hun Cho ) , 문현우 ( Raymond Hyun Woo Moon ) , 김성용 ( Sung Yong Kim ) , 최백규 ( Baek Gyu Choi ) , 오광원 ( Gwang Won Oh ) , 정관영 ( Kwan Young Joung ) , 강인필 ( In Pil Kang )

발행기관 : 한국센서학회 간행물 : 센서학회지 30권 6호 발행 연도 : 2021 페이지 : pp. 388-394 (7 pages)

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The conventional microelectromechanical system (MEMS) process has been used to fabricate sensors with high costs and high-volume productions. Emerging 3D printing can utilize various materials and quickly fabricate a product using low-cost equipment rather than traditional manufacturing processes. 3D printing also can produce the sensor using various materials and design its sensing structure with freely optimized shapes. Hence, 3D printing is expected to be a new technology that can produce sensors on-site and respond to on-demand demand by combining it with open platform technology. Therefore, this paper reviews three standard 3D printing technologies, such as Fused Deposition Modeling (FDM), Direct Ink Writing (DIW), and Digital Light Processing (DLP), which can apply to the sensor fabrication process. The review focuses on strain/load sensors having both sensing material features and structural features as well. NCPC (Nano Carbon Piezoresistive Composite) is also introduced as a promising 3D material due to its favorable sensing characteristics.

KCI등재

8Computational analysis of the effect of SOI vertical slot optical waveguide specifications on integrated-optic biochemical waveguide wensitivity

저자 : Hongsik Jung

발행기관 : 한국센서학회 간행물 : 센서학회지 30권 6호 발행 연도 : 2021 페이지 : pp. 395-407 (13 pages)

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The effect of the specifications of a silicon-on-insulator vertical slot optical waveguide on the sensitivity of homogeneous and surface sensing configurations for TE and TM polarization, respectively, was systematically analyzed using numerical software. The specifications were optimized based on the confinement factor and transmission power of the TE-guided mode distributed in the slot. The waveguide sensitivities of homogeneous and surface sensing were calculated according to the specifications of the optimized slot optical waveguide.

KCI등재

9Enhancement of electromechanical properties in lead-free (1-x)K0.5Na0.5O3-xBaZrO33 piezoceramics

저자 : Trang An Duong , Hoang Thien Khoi Nguyen , Sang-sub Lee , Chang Won Ahn , Byeong Woo Kim , Jae Shin Lee , Hyoung Su Han

발행기관 : 한국센서학회 간행물 : 센서학회지 30권 6호 발행 연도 : 2021 페이지 : pp. 408-414 (7 pages)

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This study analyzes the phase transition behavior and electrical properties of lead-free (1-x)K0.5Na0.5NbO3-xBaZrO3 (KNN-100xBZ) piezoelectric ceramics. The stabilized crystal structures in BaZrO3-modified KNN ceramics is clarified to be pseudocubic. The polymorphic phase transition from the orthorhombic to pseudocubic phases can be observed with KNN-6BZ ceramics considering the optimized piezoelectric constant (d33). Electromechanical strain behaviors are discussed. Accordingly, the enhancement of strain value at x = 0.08 (composition) may originate from the coexistence of ferroelectric domains and polar nanoregions. A schematic of domains for KNN, KNN-8BZ, and KNN-15BZ ceramics has been proposed to describe the relationship between the stabilized relaxor and changes in electrical properties.

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10굴절률 기반 토양 수분 센서

저자 : 심은선 ( Eun-seon Sim ) , 화수빈 ( Su-bin Hwa ) , 장익훈 ( Ik-hoon Jang ) , 나준희 ( Jun-hee Na ) , 김민회 ( Min-hoi Kim )

발행기관 : 한국센서학회 간행물 : 센서학회지 30권 6호 발행 연도 : 2021 페이지 : pp. 415-419 (5 pages)

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We developed a highly accurate, yet inexpensive, refractive index (RI)-based soil moisture sensor. To detect the RI, a light guide was set with a light-emitting diode and photodiode. When the air fills the space between the soil particles, most of the incident light is reflected at the interface between the waveguide and the air because of the large RI difference. As the moisture of the soil increases, the macroscopic soil RI increases. This allows incident light to pass through the interface. The intensity of the light reaching the photodiode was simulated according to the change in the soil RI. Using the simulation results, we designed and manufactured a curved glass waveguide. We evaluated the performance of the RI-based soil sensor by comparing it with a commercially available, high-cost and high-performance time-domain reflectometer (TDR). Our sensor was 96% accurate, surpassing the costly TDR sensor.

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