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Shen-kan Hsiung - One of the best experts on this subject based on the ideXlab platform.

  • Portable urea biosensor based on the extended-gate Field Effect Transistor
    Sensors and Actuators B-chemical, 2003
    Co-Authors: Jia-chyi Chen, Jung-chuan Chou, Shen-kan Hsiung
    Abstract:

    Abstract In this study, extended-gate Field Effect Transistor (EGFET) was applied to fabricate disposable urea biosensor. And the 1.5 V low-voltage instrument amplifier was adopted to realize the portable urea biosensor. However, the difference between extended-gate Field Effect Transistor and traditional ion-selective Field Effect Transistor is the position of the sensitive membrane. The extended-gate Field Effect Transistor was separated into two parts, which are the sensitive membrane and MOSFET. Hence, the MOSFET device can be designed to be a part of the readout circuit and the sensitive membrane was only put in the solution. Therefore, the configuration of the extended-gate Field Effect Transistor can reduce the influence of the temperature, light and the erosion by the solutions. Besides, the configuration can reduce the cost substantially. The configuration of the extended-gate Field Effect Transistor will raise the competitiveness to develop the disposable biosensor. The content of the urea in blood is one of the indexes to diagnose the renal efficiency. Then, the portable urea biosensor is the important expandable aspect. In this study, the gels, which are the poly vinyl alcohol with pendent styrylpyridinium groups, were used to immobilize the urease. The detection of the urea is based on the variation of pH value. Then, the dynamic range of the urea biosensor is from 0.31 to 120 mg/dl at the 5 mM phosphate buffer solution and the response time is about 2 min.

  • Portable urea biosensor based on the extended-gate Field Effect Transistor
    Sensors and Actuators B-chemical, 2003
    Co-Authors: Jia-chyi Chen, Jung-chuan Chou, Tai-ping Sun, Shen-kan Hsiung
    Abstract:

    Abstract In this study, extended-gate Field Effect Transistor (EGFET) was applied to fabricate disposable urea biosensor. And the 1.5 V low-voltage instrument amplifier was adopted to realize the portable urea biosensor. However, the difference between extended-gate Field Effect Transistor and traditional ion-selective Field Effect Transistor is the position of the sensitive membrane. The extended-gate Field Effect Transistor was separated into two parts, which are the sensitive membrane and MOSFET. Hence, the MOSFET device can be designed to be a part of the readout circuit and the sensitive membrane was only put in the solution. Therefore, the configuration of the extended-gate Field Effect Transistor can reduce the influence of the temperature, light and the erosion by the solutions. Besides, the configuration can reduce the cost substantially. The configuration of the extended-gate Field Effect Transistor will raise the competitiveness to develop the disposable biosensor. The content of the urea in blood is one of the indexes to diagnose the renal efficiency. Then, the portable urea biosensor is the important expandable aspect. In this study, the gels, which are the poly vinyl alcohol with pendent styrylpyridinium groups, were used to immobilize the urease. The detection of the urea is based on the variation of pH value. Then, the dynamic range of the urea biosensor is from 0.31 to 120 mg/dl at the 5 mM phosphate buffer solution and the response time is about 2 min.

Jia-chyi Chen - One of the best experts on this subject based on the ideXlab platform.

  • Portable urea biosensor based on the extended-gate Field Effect Transistor
    Sensors and Actuators B-chemical, 2003
    Co-Authors: Jia-chyi Chen, Jung-chuan Chou, Shen-kan Hsiung
    Abstract:

    Abstract In this study, extended-gate Field Effect Transistor (EGFET) was applied to fabricate disposable urea biosensor. And the 1.5 V low-voltage instrument amplifier was adopted to realize the portable urea biosensor. However, the difference between extended-gate Field Effect Transistor and traditional ion-selective Field Effect Transistor is the position of the sensitive membrane. The extended-gate Field Effect Transistor was separated into two parts, which are the sensitive membrane and MOSFET. Hence, the MOSFET device can be designed to be a part of the readout circuit and the sensitive membrane was only put in the solution. Therefore, the configuration of the extended-gate Field Effect Transistor can reduce the influence of the temperature, light and the erosion by the solutions. Besides, the configuration can reduce the cost substantially. The configuration of the extended-gate Field Effect Transistor will raise the competitiveness to develop the disposable biosensor. The content of the urea in blood is one of the indexes to diagnose the renal efficiency. Then, the portable urea biosensor is the important expandable aspect. In this study, the gels, which are the poly vinyl alcohol with pendent styrylpyridinium groups, were used to immobilize the urease. The detection of the urea is based on the variation of pH value. Then, the dynamic range of the urea biosensor is from 0.31 to 120 mg/dl at the 5 mM phosphate buffer solution and the response time is about 2 min.

  • Portable urea biosensor based on the extended-gate Field Effect Transistor
    Sensors and Actuators B-chemical, 2003
    Co-Authors: Jia-chyi Chen, Jung-chuan Chou, Tai-ping Sun, Shen-kan Hsiung
    Abstract:

    Abstract In this study, extended-gate Field Effect Transistor (EGFET) was applied to fabricate disposable urea biosensor. And the 1.5 V low-voltage instrument amplifier was adopted to realize the portable urea biosensor. However, the difference between extended-gate Field Effect Transistor and traditional ion-selective Field Effect Transistor is the position of the sensitive membrane. The extended-gate Field Effect Transistor was separated into two parts, which are the sensitive membrane and MOSFET. Hence, the MOSFET device can be designed to be a part of the readout circuit and the sensitive membrane was only put in the solution. Therefore, the configuration of the extended-gate Field Effect Transistor can reduce the influence of the temperature, light and the erosion by the solutions. Besides, the configuration can reduce the cost substantially. The configuration of the extended-gate Field Effect Transistor will raise the competitiveness to develop the disposable biosensor. The content of the urea in blood is one of the indexes to diagnose the renal efficiency. Then, the portable urea biosensor is the important expandable aspect. In this study, the gels, which are the poly vinyl alcohol with pendent styrylpyridinium groups, were used to immobilize the urease. The detection of the urea is based on the variation of pH value. Then, the dynamic range of the urea biosensor is from 0.31 to 120 mg/dl at the 5 mM phosphate buffer solution and the response time is about 2 min.

Jung-chuan Chou - One of the best experts on this subject based on the ideXlab platform.

  • Portable urea biosensor based on the extended-gate Field Effect Transistor
    Sensors and Actuators B-chemical, 2003
    Co-Authors: Jia-chyi Chen, Jung-chuan Chou, Shen-kan Hsiung
    Abstract:

    Abstract In this study, extended-gate Field Effect Transistor (EGFET) was applied to fabricate disposable urea biosensor. And the 1.5 V low-voltage instrument amplifier was adopted to realize the portable urea biosensor. However, the difference between extended-gate Field Effect Transistor and traditional ion-selective Field Effect Transistor is the position of the sensitive membrane. The extended-gate Field Effect Transistor was separated into two parts, which are the sensitive membrane and MOSFET. Hence, the MOSFET device can be designed to be a part of the readout circuit and the sensitive membrane was only put in the solution. Therefore, the configuration of the extended-gate Field Effect Transistor can reduce the influence of the temperature, light and the erosion by the solutions. Besides, the configuration can reduce the cost substantially. The configuration of the extended-gate Field Effect Transistor will raise the competitiveness to develop the disposable biosensor. The content of the urea in blood is one of the indexes to diagnose the renal efficiency. Then, the portable urea biosensor is the important expandable aspect. In this study, the gels, which are the poly vinyl alcohol with pendent styrylpyridinium groups, were used to immobilize the urease. The detection of the urea is based on the variation of pH value. Then, the dynamic range of the urea biosensor is from 0.31 to 120 mg/dl at the 5 mM phosphate buffer solution and the response time is about 2 min.

  • Portable urea biosensor based on the extended-gate Field Effect Transistor
    Sensors and Actuators B-chemical, 2003
    Co-Authors: Jia-chyi Chen, Jung-chuan Chou, Tai-ping Sun, Shen-kan Hsiung
    Abstract:

    Abstract In this study, extended-gate Field Effect Transistor (EGFET) was applied to fabricate disposable urea biosensor. And the 1.5 V low-voltage instrument amplifier was adopted to realize the portable urea biosensor. However, the difference between extended-gate Field Effect Transistor and traditional ion-selective Field Effect Transistor is the position of the sensitive membrane. The extended-gate Field Effect Transistor was separated into two parts, which are the sensitive membrane and MOSFET. Hence, the MOSFET device can be designed to be a part of the readout circuit and the sensitive membrane was only put in the solution. Therefore, the configuration of the extended-gate Field Effect Transistor can reduce the influence of the temperature, light and the erosion by the solutions. Besides, the configuration can reduce the cost substantially. The configuration of the extended-gate Field Effect Transistor will raise the competitiveness to develop the disposable biosensor. The content of the urea in blood is one of the indexes to diagnose the renal efficiency. Then, the portable urea biosensor is the important expandable aspect. In this study, the gels, which are the poly vinyl alcohol with pendent styrylpyridinium groups, were used to immobilize the urease. The detection of the urea is based on the variation of pH value. Then, the dynamic range of the urea biosensor is from 0.31 to 120 mg/dl at the 5 mM phosphate buffer solution and the response time is about 2 min.

Marco Rolandi - One of the best experts on this subject based on the ideXlab platform.

  • a polysaccharide bioprotonic Field Effect Transistor
    Nature Communications, 2011
    Co-Authors: C Zhong, Yingxin Deng, Anita Fadavi Roudsari, Adnan Kapetanovic, M P Anantram, Marco Rolandi
    Abstract:

    In nature, electrical signalling occurs with ions and protons, rather than electrons. Artificial devices that can control and monitor ionic and protonic currents are thus an ideal means for interfacing with biological systems. Here we report the first demonstration of a biopolymer protonic Field-Effect Transistor with proton-transparent PdH(x) contacts. In maleic-chitosan nanofibres, the flow of protonic current is turned on or off by an electrostatic potential applied to a gate electrode. The protons move along the hydrated maleic-chitosan hydrogen-bond network with a mobility of ~4.9×10(-3) cm(2) V(-1) s(-1). This study introduces a new class of biocompatible solid-state devices, which can control and monitor the flow of protonic current. This represents a step towards bionanoprotonics.

  • A polysaccharide bioprotonic Field-Effect Transistor
    Nature Communications, 2011
    Co-Authors: C Zhong, Yingxin Deng, Anita Fadavi Roudsari, Adnan Kapetanovic, M P Anantram, Marco Rolandi
    Abstract:

    The manipulation of electrons forms the basis of modern technology, whereas electrical signalling processes in nature are based on ions and protons. Rolandi and colleagues present a proton Transistor based on polysaccharide nanofibres, which can control the flow of protonic currents. In nature, electrical signalling occurs with ions and protons, rather than electrons. Artificial devices that can control and monitor ionic and protonic currents are thus an ideal means for interfacing with biological systems. Here we report the first demonstration of a biopolymer protonic Field-Effect Transistor with proton-transparent PdH_x contacts. In maleic-chitosan nanofibres, the flow of protonic current is turned on or off by an electrostatic potential applied to a gate electrode. The protons move along the hydrated maleic–chitosan hydrogen-bond network with a mobility of ~4.9×10^−3 cm^2 V^−1 s^−1. This study introduces a new class of biocompatible solid-state devices, which can control and monitor the flow of protonic current. This represents a step towards bionanoprotonics.

M S Shur - One of the best experts on this subject based on the ideXlab platform.

  • Plasmonic and bolometric terahertz detection by graphene Field-Effect Transistor
    Applied Physics Letters, 2013
    Co-Authors: A. V. Muraviev, Wojciech Knap, S L Rumyantsev, G. Liu, A. A. Balandin, M S Shur
    Abstract:

    Polarization dependence analysis of back-gated graphene Field-Effect Transistor terahertz responsivity at frequencies ranging from 1.63 to 3.11 THz reveals two independent mechanisms of THz detection by graphene Transistor: plasmonic, associated with the Transistor nonlinearity, and bolometric, caused by graphene sheet temperature increase due to THz radiation absorption. In the bolometric regime, electron and hole branches demonstrate a very different response to THz radiation, which we link to the asymmetry of the current-voltage characteristics temperature dependence with respect to the Dirac point. Obtained results are important for development of high-efficiency graphene THz detectors.

  • Field Effect Transistor as ultrafast detector of modulated terahertz radiation
    Solid-state Electronics, 2008
    Co-Authors: Yu V Kachorovskii, M S Shur
    Abstract:

    Abstract Theoretical analysis of the detection of modulated sub-terahertz and terahertz radiation by a short channel Field Effect Transistor (FET) predicts a very high upper limit for modulation frequency, Ωmax, up to 100 GHz or even higher. Even the minimal value of Ωmax, which is reached deep below the threshold, lies in the gigahertz range, thus promising for usage of FET-based structures for ultrafast detection of modulated terahertz radiation

  • resonant detection of subterahertz radiation by plasma waves in a submicron Field Effect Transistor
    Applied Physics Letters, 2002
    Co-Authors: W Knap, Yanqing Deng, S L Rumyantsev, M S Shur, C A Saylor, L C Brunel
    Abstract:

    The resonant detection of subterahertz radiation by two-dimensional electron plasma confined in a submicron gate GaAs/AlGaAs Field-Effect Transistor is demonstrated. The results show that the critical parameter that governs the sensitivity of the resonant detection is ωτ, where ω is the radiation frequency and τ is the momentum scattering time. By lowering the temperature and hence increasing τ and increasing the detection frequency ω, we reached ωτ∼1 and observed resonant detection of 600 GHz radiation in a 0.15 μm gate length GaAs Field-Effect Transistor. The evolution of the observed photoresponse signal with temperature and frequency is reproduced well within the framework of a theoretical model.