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  1. Article ; Online: A Study on the O

    Kim, Jinkyeong / Han, Ji-Hoon / Kim, Joon Hyub

    Sensors (Basel, Switzerland)

    2023  Volume 23, Issue 18

    Abstract: In this study, we analyzed the morphological changes and molecular structure changes on the surface of single-walled carbon nanotube (SWCNT) films during oxygen plasma ( ... ...

    Abstract In this study, we analyzed the morphological changes and molecular structure changes on the surface of single-walled carbon nanotube (SWCNT) films during oxygen plasma (O
    Language English
    Publishing date 2023-09-11
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2052857-7
    ISSN 1424-8220 ; 1424-8220
    ISSN (online) 1424-8220
    ISSN 1424-8220
    DOI 10.3390/s23187812
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Reciprocating Arc Silicon Strain Gauges.

    Han, Ji-Hoon / Min, Sung Joon / Kim, Joon Hyub / Min, Nam Ki

    Sensors (Basel, Switzerland)

    2023  Volume 23, Issue 3

    Abstract: Currently, silicon-strain-gauge-based diaphragm pressure sensors use four single-gauge chips for high-output sensitivity. However, the four-single-gauge configuration increases the number of glass frit bonds and the number of aluminum wire bonds, ... ...

    Abstract Currently, silicon-strain-gauge-based diaphragm pressure sensors use four single-gauge chips for high-output sensitivity. However, the four-single-gauge configuration increases the number of glass frit bonds and the number of aluminum wire bonds, reducing the long-term stability, reliability, and yield of the diaphragm pressure sensor. In this study, a new design of general-purpose silicon strain gauges was developed to improve the sensor output voltage while reducing the number of bonds. The new gauges consist grid patterns with a reciprocating arc of silicon piezoresistors on a thin glass backing. The gauges make handling easier in the bonding process due to the use of thin glass for the gauge backing. The pressure sensors were tested under pressure ranging from 0 to 50 bar at five different temperatures, with a linear output with a typical sensitivity of approximately 16 mV/V/bar and an offset shift of -6 mV to 2 mV. The new approach also opens the possibility to extend arc strain gauges to half-bridge and full-bridge configurations to further reduce the number of glass frit and Al wire bonds in the diaphragm pressure sensor.
    Language English
    Publishing date 2023-01-26
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2052857-7
    ISSN 1424-8220 ; 1424-8220
    ISSN (online) 1424-8220
    ISSN 1424-8220
    DOI 10.3390/s23031381
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Half-Bridge Silicon Strain Gauges with Arc-Shaped Piezoresistors.

    Han, Ji-Hoon / Min, Sung Joon / Lee, Eun-Sang / Kim, Joon Hyub / Min, Nam Ki

    Sensors (Basel, Switzerland)

    2023  Volume 23, Issue 20

    Abstract: Half-bridge silicon strain gauges are widely used in the fabrication of diaphragm-type high-pressure sensors, but in some applications, they suffer from low output sensitivity because of mounting position constraints. Through a special design and ... ...

    Abstract Half-bridge silicon strain gauges are widely used in the fabrication of diaphragm-type high-pressure sensors, but in some applications, they suffer from low output sensitivity because of mounting position constraints. Through a special design and fabrication approach, a new half-bridge silicon strain gauge comprising one arc gauge responding to tangential strain and another linear gauge measuring radial strain was developed using Silicon-on-Glass (SiOG) substrate technology. The tangential gauge consists of grid patterns, such as the reciprocating arc of silicon piezoresistors on a thin glass substrate. When two half-bridges are connected to form a full bridge with arc-shaped gauges that respond to tangential strain, they have the advantage of providing much higher output sensitivity than a conventional half-bridge. Pressure sensors tested under pressure ranging from 0 to 50 bar at five different temperatures indicate a linear output with a typical sensitivity of approximately 16 mV/V/bar, a maximum zero shift of 0.05% FS, and a span shift of 0.03% FS. The higher output level of pressure sensing gauges will provide greater signal strength, thus maintaining a better signal-to-noise ratio than conventional pressure sensors. The offset and span shift curves are quite linear across the operating temperature range, giving the end user the advantage of using very simple algorithms for temperature compensation of offset and span shift.
    Language English
    Publishing date 2023-10-11
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2052857-7
    ISSN 1424-8220 ; 1424-8220
    ISSN (online) 1424-8220
    ISSN 1424-8220
    DOI 10.3390/s23208390
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: Enhanced Stability and Amplified Signal Output of Single-Wall Carbon Nanotube-Based NH

    Kim, Joon Hyub / Jin, Joon-Hyung / Min, Nam Ki

    Nanomaterials (Basel, Switzerland)

    2020  Volume 10, Issue 6

    Abstract: Pristine nanomaterials are normally prepared using finely controlled fabrication processes. Because no imperfect nanostructure remains, they cannot be used directly as electrode substrates of functional devices. This is because perfectly organized ... ...

    Abstract Pristine nanomaterials are normally prepared using finely controlled fabrication processes. Because no imperfect nanostructure remains, they cannot be used directly as electrode substrates of functional devices. This is because perfectly organized nanostructures or nanomaterials commonly require posttreatment to generate intentionally, the kinds of desirable defects inside or on their surfaces that enable effective functionalization. Plasma treatment is an easier, simpler and more widely used way (relative to other methods) to modify a variety of nanomaterials, although plasma-functionalized nano surfaces commonly have a short lifetime. We present herein a dual plasma treatment (DPT) that significantly enhances the degree and lifetime of plasma-induced surface functional groups on single-walled carbon nanotubes (SWCNTs). The DPT process consists of two individually optimized oxygen-plasma treatments. The DPT-modified SWCNT functioned as a sensing material for ammonia gas for more than a month. It also provided more than three times the degree of functionality for amplified signal output than with a single-plasma-treated SWCNT electrode.
    Language English
    Publishing date 2020-05-27
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2662255-5
    ISSN 2079-4991
    ISSN 2079-4991
    DOI 10.3390/nano10061026
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Enhancement of Withstand Voltage in Silicon Strain Gauges Using a Thin Alkali-Free Glass.

    Kim, Joon Hyub / Han, Ji-Hoon / Park, Chan Won / Min, Nam Ki

    Sensors (Basel, Switzerland)

    2020  Volume 20, Issue 11

    Abstract: We present a cost-effective approach to produce silicon strain gauges that can withstand very high voltage without using any complex package design and without sacrificing any sensor performance. This is achieved by a special silicon strain gauge ... ...

    Abstract We present a cost-effective approach to produce silicon strain gauges that can withstand very high voltage without using any complex package design and without sacrificing any sensor performance. This is achieved by a special silicon strain gauge structure created on an alkali-free glass substrate that has a high breakdown voltage. A half-bridge silicon strain gauge is designed, fabricated, and then tested to measure its output characteristics. The device has a glass layer that is only 25-55 µm thick; it shows it is able to withstand a voltage of over 2000 V while maintaining a high degree of linearity with correlation coefficients higher than 0.9990 and an average sensitivity of 104.13. Due to their unique electrical properties, silicon strain gauges-on-glass chips hold much promise for use in advanced force and pressure sensors.
    Language English
    Publishing date 2020-05-26
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2052857-7
    ISSN 1424-8220 ; 1424-8220
    ISSN (online) 1424-8220
    ISSN 1424-8220
    DOI 10.3390/s20113024
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: Functionalization of Molybdenum Disulfide via Plasma Treatment and 3-Mercaptopropionic Acid for Gas Sensors.

    Seo, Won Seok / Kim, Dae Ki / Han, Ji-Hoon / Park, Kang-Bak / Ryu, Su Chak / Min, Nam Ki / Kim, Joon Hyub

    Nanomaterials (Basel, Switzerland)

    2020  Volume 10, Issue 9

    Abstract: Monolayer and multilayer molybdenum disulfide ( ... ...

    Abstract Monolayer and multilayer molybdenum disulfide (MoS
    Language English
    Publishing date 2020-09-17
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2662255-5
    ISSN 2079-4991
    ISSN 2079-4991
    DOI 10.3390/nano10091860
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Evaluation of Surface Cleaning Procedures in Terms of Gas Sensing Properties of Spray-Deposited CNT Film: Thermal- and O₂ Plasma Treatments.

    Kim, Joon Hyub / Song, Min-Jung / Kim, Ki Beom / Jin, Joon-Hyung / Min, Nam Ki

    Sensors (Basel, Switzerland)

    2016  Volume 17, Issue 1

    Abstract: The effect of cleaning the surface of single-walled carbon nanotube (SWNT) networks by thermal and the O₂ plasma treatments is presented in terms of NH₃ gas sensing characteristics. The goal of this work is to determine the relationship between the ... ...

    Abstract The effect of cleaning the surface of single-walled carbon nanotube (SWNT) networks by thermal and the O₂ plasma treatments is presented in terms of NH₃ gas sensing characteristics. The goal of this work is to determine the relationship between the physicochemical properties of the cleaned surface (including the chemical composition, crystal structure, hydrophilicity, and impurity content) and the sensitivity of the SWNT network films to NH₃ gas. The SWNT networks are spray-deposited on pre-patterned Pt electrodes, and are further functionalized by heating on a programmable hot plate or by O₂ plasma treatment in a laboratory-prepared plasma chamber. Cyclic voltammetry was employed to semi-quantitatively evaluate each surface state of various plasma-treated SWNT-based electrodes. The results show that O₂ plasma treatment can more effectively modify the SWNT network surface than thermal cleaning, and can provide a better conductive network surface due to the larger number of carbonyl/carboxyl groups, enabling a faster electron transfer rate, even though both the thermal cleaning and the O₂ plasma cleaning methods can eliminate the organic solvent residues from the network surface. The NH₃ sensors based on the O₂ plasma-treated SWNT network exhibit higher sensitivity, shorter response time, and better recovery of the initial resistance than those prepared employing the thermally-cleaned SWNT networks.
    Language English
    Publishing date 2016-12-30
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2052857-7
    ISSN 1424-8220 ; 1424-8220
    ISSN (online) 1424-8220
    ISSN 1424-8220
    DOI 10.3390/s17010073
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: A Fully Integrated Paper-Microfluidic Electrochemical Device for Simultaneous Analysis of Physiologic Blood Ions.

    Jin, Joon-Hyung / Kim, Joon Hyub / Lee, Sang Ki / Choi, Sam Jin / Park, Chan Won / Min, Nam Ki

    Sensors (Basel, Switzerland)

    2018  Volume 18, Issue 1

    Abstract: A fully integrated paper microfluidic electrochemical device equipped with three different cation permeable films is developed to determine blood ions ( ... ...

    Abstract A fully integrated paper microfluidic electrochemical device equipped with three different cation permeable films is developed to determine blood ions (Cl
    MeSH term(s) Humans ; Ions/blood ; Lab-On-A-Chip Devices ; Microfluidics ; Potentiometry
    Chemical Substances Ions
    Keywords covid19
    Language English
    Publishing date 2018-01-01
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2052857-7
    ISSN 1424-8220 ; 1424-8220
    ISSN (online) 1424-8220
    ISSN 1424-8220
    DOI 10.3390/s18010104
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Effect of oxygen plasma treatment on carbon nanotube-based sensors.

    Ham, Seung Woo / Hong, Hyun Pyo / Kim, Joon Hyub / Min, Sung Jun / Min, Nam Ki

    Journal of nanoscience and nanotechnology

    2015  Volume 14, Issue 11, Page(s) 8476–8481

    Abstract: We present the research results of the use of plasma modification for the fabrication of carbon nanotube-based devices for chemical and biological sensing. The oxygen plasma treatment of multiwalled carbon nanotubes (MWCNTs) effectively grafts oxygen ... ...

    Abstract We present the research results of the use of plasma modification for the fabrication of carbon nanotube-based devices for chemical and biological sensing. The oxygen plasma treatment of multiwalled carbon nanotubes (MWCNTs) effectively grafts oxygen atoms onto the CNT surface. For investigating the impact of plasma modification on the MWCNT-based sensor performance, three different sensors are fabricated: NH3 gas sensors, humidity sensors, and immunosensors. The plasma-modified MWCNTs (p-MWCNTs) exhibit a sensitivity to NH3 that is approximately twice that of the corresponding untreated sensor. The humidity sensor with a p-MWCNT top electrode exhibits a much faster response time compared with the untreated MWCNT electrodes. The p-MWCNT immunosensor exhibits a detection limit almost 1000 times lower than that of the standard ELISA assay, while the untreated MWCNTs exhibit no detectable signal. These results imply that the oxygen-containing functional groups on the CNT surface significantly affect the performance of the CNT-based chemical and biological sensors.
    Language English
    Publishing date 2015-05-07
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1533-4899
    ISSN (online) 1533-4899
    DOI 10.1166/jnn.2014.10007
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Voltammetric characterization of a fully integrated, patterned single walled carbon nanotube three-electrode system on a glass substrate.

    Jin, Joon-Hyung / Kim, Joon Hyub / Lee, Jun-Yong / Min, Nam Ki

    The Analyst

    2011  Volume 136, Issue 9, Page(s) 1910–1915

    Abstract: A single walled carbon nanotube (SWCNT)-based three-electrode system was fully integrated on glass substrates using a standard microfabrication process and electrochemically characterized using cyclic voltammetry. O(2) plasma functionalization of the ... ...

    Abstract A single walled carbon nanotube (SWCNT)-based three-electrode system was fully integrated on glass substrates using a standard microfabrication process and electrochemically characterized using cyclic voltammetry. O(2) plasma functionalization of the SWCNT film working electrode for achieving high sensitivity was voltammetrically optimized with respect to the plasma power and treatment time. Chlorination of a Ag thin-film was done in an acidic solution for different dip times to form a thin-film Ag/AgCl reference electrode. The Nernstian behavior of as-prepared and seven-day-aged Ag/AgCl thin-film electrodes was investigated for seeking the optimum reference electrode with long-term stability and was compared to a commercial reference electrode. A quality control evaluation and a performance assessment of the fully integrated SWCNT-transferred sensing systems were performed using cyclic voltammetry. The proposed SWCNT-based three electrode device exhibited clear electrochemistry under voltammetric conditions, and is therefore a candidate for use in all electrochemical biosensors.
    MeSH term(s) Biosensing Techniques/instrumentation ; Biosensing Techniques/methods ; Electrochemical Techniques/instrumentation ; Electrochemical Techniques/methods ; Electrodes ; Glass/chemistry ; Nanotubes, Carbon/chemistry ; Silver Compounds/chemistry
    Chemical Substances Nanotubes, Carbon ; Silver Compounds ; silver chloride (MWB0804EO7)
    Language English
    Publishing date 2011-05-07
    Publishing country England
    Document type Comparative Study ; Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 210747-8
    ISSN 1364-5528 ; 0003-2654
    ISSN (online) 1364-5528
    ISSN 0003-2654
    DOI 10.1039/c0an00711k
    Database MEDical Literature Analysis and Retrieval System OnLINE

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