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한국센서학회> 센서학회지> Fabrication of 1D Metal Oxide Nanostructures Using Glancing Angle Deposition for High Performance Gas Sensors

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Fabrication of 1D Metal Oxide Nanostructures Using Glancing Angle Deposition for High Performance Gas Sensors

( Jun Min Suh ) , ( Ho Won Jang )
  • : 한국센서학회
  • : 센서학회지 26권4호
  • : 연속간행물
  • : 2017년 07월
  • : 228-234(7pages)

DOI


목차

1. INTRODUCTION
2. STRATEGIES TO ENHANCE GAS SENSING PROPERTIES BY NANOSTRUCTURES FABRICATED USING GAD
3. CONCLUSION AND PERSPECTIVES
ACKNOWLEDGMENT
REFERENCES

키워드 보기


초록 보기

Gas sensors based on metal-oxide-semiconductors are predominantly used in numerous applications including monitoring indoor air quality and detecting harmful substances such as volatile organic compounds. Nanostructures, e.g., nanoparticles, nanotubes, nano-domes, or nanofibers, have been widely utilized to improve the gas sensing properties of metal-oxide-semiconductors by increasing the effective surface area participating in the surface reaction with target gas molecules. Recently, 1-dimensional (1D) metal oxide nano-structures fabricated using glancing angle deposition (GAD) method with e-beam evaporation have been widely employed to increase the surface-to-volume ratio significantly with large-area uniformity and reproducibility, leading to promising gas sensing properties. Herein, we provide a brief overview of 1D metal oxide nanostructures fabricated using GAD and their gas sensing properties in terms of fabrication methods, morphologies, and additives. Moreover, the gas sensing mechanisms and perspectives are presented.

ECN


UCI

간행물정보

  • : 공학분야  > 기계공학
  • : KCI 등재
  • : -
  • : 격월
  • : 1225-5475
  • :
  • : 학술지
  • : 연속간행물
  • : 1992-2017
  • : 1599


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1CMOS Image Sensor with Dual-Sensitivity Photodiodes and Switching Circuit for Wide Dynamic Range Operation

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발행기관 : 한국센서학회 간행물 : 센서학회지 26권 4호 발행 연도 : 2017 페이지 : pp. 223-227 (5 pages)

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Conventional CMOS image sensors (CISs) have a trade-off relationship between dynamic range and sensitivity. In addition, their sen-sitivity is determined by the photodiode capacitance. In this paper, CISs that consist of dual-sensitivity photodiodes in a unit pixel are proposed for achieving wide dynamic ranges. In the proposed CIS, signal charges are generated in the dual photodiodes during inte-gration, and these generated signal charges are accumulated in the floating-diffusion node. The signal charges generated in the high-sen-sitivity photodiodes are transferred to the input of the comparator through an additional source follower, and the signal voltages converted by the source follower are compared with a reference voltage in the comparator. The output voltage of the comparator deter-mines which photodiode is selected. Therefore, the proposed CIS composed of dual-sensitivity photodiodes extends the dynamic range according to the intensity of light. A 94 × 150 pixel array image sensor was designed using a conventional 0.18 μm CMOS process and its performance was simulated.

2Fabrication of 1D Metal Oxide Nanostructures Using Glancing Angle Deposition for High Performance Gas Sensors

저자 : ( Jun Min Suh ) , ( Ho Won Jang )

발행기관 : 한국센서학회 간행물 : 센서학회지 26권 4호 발행 연도 : 2017 페이지 : pp. 228-234 (7 pages)

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Gas sensors based on metal-oxide-semiconductors are predominantly used in numerous applications including monitoring indoor air quality and detecting harmful substances such as volatile organic compounds. Nanostructures, e.g., nanoparticles, nanotubes, nano-domes, or nanofibers, have been widely utilized to improve the gas sensing properties of metal-oxide-semiconductors by increasing the effective surface area participating in the surface reaction with target gas molecules. Recently, 1-dimensional (1D) metal oxide nano-structures fabricated using glancing angle deposition (GAD) method with e-beam evaporation have been widely employed to increase the surface-to-volume ratio significantly with large-area uniformity and reproducibility, leading to promising gas sensing properties. Herein, we provide a brief overview of 1D metal oxide nanostructures fabricated using GAD and their gas sensing properties in terms of fabrication methods, morphologies, and additives. Moreover, the gas sensing mechanisms and perspectives are presented.

3Design and Vibration Analysis of Tri-axis Linear Vibratory MEMS Gyroscope

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발행기관 : 한국센서학회 간행물 : 센서학회지 26권 4호 발행 연도 : 2017 페이지 : pp. 235-238 (4 pages)

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4Radial Electrical Impedance: A Potential Indicator for Noninvasive Cuffless Blood Pressure Measurement

저자 : ( Toan Huu Huynh ) , ( Wan-young Chung )

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Noninvasive, cuffless, and continuous blood pressure (BP) monitoring is essential to prevent and control hypertension. A well-known existing method for this measurement is pulse transit time (PTT), which has been investigated by many researchers as a promising approach. However, the fundamental principle of the PTT method is based on the time interval taken by a pulse wave to propagate between the proximal and distal arterial sites. Consequently, this method needs an inde-pendent system with two devices placed at two different sites, which is a problem. Even though some studies attempted to synchronize the system, it is bulky and inconvenient by contemporary standards. To find a more sensitive method to be used in a BP measurement device, this study used radial electrical bioimpedance (REB) as a potential indicator for BP deter-mination. Only one impedance plethysmography channel at the wrist is performed for demonstrating a ubiquitous BP wear-able device. The experiment was evaluated on eight healthy subjects with the ambulatory BP monitor on the upper arm as a reference. The results demonstrated the potential of the proposed method by the correlation of estimated systolic (SBP) and diastolic (DBP) BP against the reference at 0.84 ± 0.05 and 0.83 ± 0.05, respectively. REB also tracked the DBP well with a root-mean-squared-error of 7.5±1.35 mmHg.

5소 동물 1H 1.5 T 자기공명영상 장치용 유연인쇄기판 기반 새장형 수신 코일 센서

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A novel method to implement a birdcage-type receiving coil sensor for use in a magnetic resonance imaging(MRI) system has been demonstrated employing a flexible printed circuit board (FPCB) fabrication technique. Unlike the conventional methods, the two-dimen-sional shape of the coil sensor is first implemented as a FPCB and then it is attached to the surface of a cylindrical supporting structure to implement the three-dimensional birdcage-type coil sensor. The proposed method is very effective to implement object-specific MRI coil sensors especially for small animal measurements in research and preclinical applications since the existing well-developed FPCB-based techniques can easily meet the requirements on accuracies and costs during coil implement process. The performances of the coil sensor verified through 1H 1.5T MRI measurements for small animals and it showed excellent characteristics by providing a high spatial precision and a high signal-to-noise ratio.

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In this research a medical palpation guidance system for minimally invasive surgery (MIS) is proposed. Palpation is a useful tool for identifying a size and location of a lump during a surgery. However, conventional manual palpation is only available in open surgery, so there has been several researches about palpation assistant or guidance system for MIS. The previously developed systems are based on a pressure based or stiffness based approach. These previous approaches have some limitations in increasing complexity of the sys-tems and lack of geometric information about the lump which is more important information for the lump removal than the stiffness information. We propose a palpation guidance system using a novel approach using contact pressure distribution. Since our approach gives the geometry information of the lump as well as the existence information, the operator can easily notice the currently identified lump region and the optimal position for the next palpation. The experiment results show that our approach can offer the geometry infor-mation of the lump correctly.

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LCD(Liquid Crystal Display) panel cutting problem is a sort of two dimensional cutting stock problem. A cutting stock problem is problem that it minimizes the loss of the stock when a stock is cut into various parts. In the most research of the two dimensional cutting stock problem, it is supposed that the relative angle of a stock and parts is not important. Usually the angle is regarded as horizontal or perpendicular. In the manufacturing of polarizing film of LCD, the relative angle should be maintained at some specific angle because of the physical and/or chemical characteristics of raw material. We propose a mathematical model for solving this problem, a two-dimensional non-Guillotine cutting stock problem that is restricted by an arranged angle. Some example problems are solved by the C++ program using ILOG CPLEX classes. We could get the verification and validation of the suggested model based on the solutions.

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12
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센서학회지
1권 1호(1992) ~ 26권 6호 (2017)

NICE (News & Information for Chemical Engineers)
17권 3호(1999) ~ 35권 6호 (2017)

KCI등재 SCOUPUS

Korean Chem.Eng.Res.(화학공학)
1권 1호(1963) ~ 55권 6호 (2017)

기계산업통계월보
1999권 4호(1999) ~ 2017권 11호 (2017)

KCI등재

센서학회지
1권 1호(1992) ~ 26권 6호 (2017)

기계산업통계월보
1999권 4호(1999) ~ 2017권 11호 (2017)

기계산업편람
1976권 0호(1976) ~ 2017권 0호 (2017)

KCI등재 SCOUPUS

Korean Chem.Eng.Res.(화학공학)
1권 1호(1963) ~ 55권 6호 (2017)

KCI등재

센서학회지
1권 1호(1992) ~ 26권 6호 (2017)

기계산업통계월보
1999권 4호(1999) ~ 2017권 11호 (2017)

기계산업통계월보
1999권 4호(1999) ~ 2017권 11호 (2017)

기계산업통계월보
1999권 4호(1999) ~ 2017권 11호 (2017)

NICE (News & Information for Chemical Engineers)
17권 3호(1999) ~ 35권 6호 (2017)

무역통계연보
1986권 0호(1986) ~ 2017권 0호 (2017)

기계산업통계월보
1999권 4호(1999) ~ 2017권 11호 (2017)

KCI등재

센서학회지
1권 1호(1992) ~ 26권 6호 (2017)

NICE (News & Information for Chemical Engineers)
17권 3호(1999) ~ 35권 6호 (2017)

KCI등재 SCOUPUS

Korean Chem.Eng.Res.(화학공학)
1권 1호(1963) ~ 55권 6호 (2017)

KCI등재 SCOUPUS

Korean Chem.Eng.Res.(화학공학)
1권 1호(1963) ~ 55권 6호 (2017)

기계산업통계월보
1999권 4호(1999) ~ 2017권 11호 (2017)

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