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Jung-chuan Chou - One of the best experts on this subject based on the ideXlab platform.
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preparation and characterization of the titanium dioxide thin films used for Ph Electrode and procaine drug sensor by sol gel method
Materials Chemistry and Physics, 2009Co-Authors: Yi-hung Liao, Jung-chuan ChouAbstract:Abstract We used titanium dioxide (TiO 2 ) as the sensing layer of an ion selective Ph sensor Electrode, and as the substrate for a procaine drug sensitive membrane sensor. The TiO 2 thin films were prepared using sol–gel spin coating technology. We adopted the Ti(OC 4 H 9 ) 4 as the precursor, and added an ethanol solute to obtain the TiO 2 sol. The sol–gel was spun coated onto the indium tin oxide (ITO) substrate. The drug sensitive membrane was coated on the TiO 2 film. We then measured the I DS –V G curves of the TiO 2 ion selective Electrode (ISE) Ph sensor in Ph buffer solutions that had different Ph concentrations using a Keithley 236 Semiconductor Parameter Analyzer instrument. The procaine concentration was measured from 10 −2 M to 10 −6 M with the drug sensitive membrane using a HP 34401A Digital Multimeter. We prepared the TiO 2 ISE Ph sensor and obtained a high Ph sensitivity of 58.73 mV/Ph. Uniform TiO 2 films surface structures, with an average roughness (Ra) of 10.211 nm and root mean square roughness (Rms) of 13.01 nm were obtained. The drift effect of the titanium dioxide ion selective Ph sensor Electrode is 1.97 mV h −1 . The sensitivity of the procaine drug sensor is 55.03 mV pC −1 between 1.0 × 10 −2 mol L −1 and 1.0 × 10 −6 mol L −1 procaine concentrations. The detection limit is 5.0 × 10 −6 mol L −1 . The response time to reach 90% output voltage is 16 s. Forty seconds are required to reach 95% output voltage. The procaine drug sensor 1 × 10 −3 mol L −1 drift test is 3.64 mV h −1 and the variation in output voltage of the repeated measurement is less than 7.4 mV.
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Comparison of Polypyrrole-Conducting Polymer and Ag/AgCl Reference Electrodes Used for Ruthenium Dioxide Ph Electrode
Journal of The Electrochemical Society, 2008Co-Authors: Yi-hung Liao, Jung-chuan ChouAbstract:A laboratory-made conducting polymer reference Electrode (CPRE) was developed using polypyrrole coated onto indium tin oxide by the electroplating technique and used as the miniaturized reference Electrode (RE) for a ruthenium dioxide (RUO 2 ) ion-selective Electrode device in electrochemical hydrogen ion measurements. Ruthenium dioxide thin films were deposited by a radio frequency sputtering method, and the sensing characteristics of RuO 2 were measured with a CPRE and an Ag/AgCl RE. Subsequently, the selectivity coefficients (K + , Na + , Ca 2+ , Mg 2+ , and NH 4+ ) of the ruthenium dioxide thin film with the CPRE were investigated. Furthermore, we also compared the sensing characteristics (such as: Ph sensitivity, drift rate, hysteresis width, and response time) of the RuO 2 thin-film Ph Electrode with a commercial Ag/AgCl RE and the laboratory-made CPRE. The experimental results demonstrated that the sensing characteristics of the RUO 2 Ph Electrode measured with the laboratory-made CPRE are superior to the Ag/AgCl RE, and the size of the CPRE can be efficiently miniaturized compared to a commercial Ag/AgCl RE.
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Study on the Time-Dependent Slow Response of the Tin Oxide Ph Electrode
IEEE Sensors Journal, 2006Co-Authors: Chu-neng Tsai, Jung-chuan Chou, Tai-ping Sun, Shen-kan HsiungAbstract:It has been known that drift and hysteresis resulted from the slow response of the Ph Electrodes. These inherent drawbacks handicap the application of the Ph Electrodes. Thus, the time-dependent slow response of the tin oxide Ph Electrode was modeled by mathematical expression. In this study, the three time-constant model was utilized to fit the drift behavior of the tin oxide Ph Electrode. Besides combining with the three time-constant model and the concept of network analysis, the hysteresis model was derived. According to the experimental results, the modeled hysteresis width was close to the measured hysteresis width. The drift behavior and the hysteresis width of the tin oxide Ph Electrode were linked by the time-constant model. In other words, the hysteresis width can be predicted by the time-constant model of the drift behavior
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Study on the sensing characteristics and hysteresis effect of the tin oxide Ph Electrode
Sensors and Actuators B-chemical, 2005Co-Authors: Chu-neng Tsai, Jung-chuan Chou, Tai-ping Sun, Shen-kan HsiungAbstract:Abstract Tin oxide thin films prepared by the radio frequency sputtering method were used as Ph sensors based on the structure of the metal oxide Electrode. The sensing characteristics and the hysteresis effect of the tin oxide Ph Electrode were studied. The hysteresis experiments were carried out under short- and long-loop circles, Ph 7–4–7–10–7 and Ph 7–2–7–12–6, respectively. Moreover, the hysteresis value was less than 7 mV in short-loop circle and the hysteresis value of Ph 7 was 9 mV in acid side ( H A ) and 11 mV in alkali side ( H B ). The sensitivity of the tin oxide Ph Electrode was investigated between Ph 2 and 12, whose Ph sensitivity was about 59 mV/Ph.
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Development of the tin oxide Ph Electrode by the sputtering method
Sensors and Actuators B-chemical, 2004Co-Authors: Chung-we Pan, Jung-chuan Chou, Tai-ping Sun, Shen-kan HsiungAbstract:In previous investigations, different preparation methods of the Ph Electrode influenced Ph-sensing characteristics. Hence, this study attempted to employ the tin oxide (SnO2) membrane in fabricating a Ph Electrode by the sputtering method, whose substrate was based on the indium tin oxide (ITO) glass substrate, and employing the two-point calibration method proved the Ph-sensing characteristic. Furthermore, to define the effective sensing area of the Ph Electrode, experimental results and simulation results were employed. According to results, enough sensing area increased the Ph sensitivity stability of the Ph Electrode and 4 mm 2 was the effective sensing area in fabricating a SnO2 Ph Electrode. After the effective fabrication process was proved, the SnO 2 Ph Electrode had linear Ph response and higher stability as it compared with the commercial Ph glass Electrode. Consequently, this study investigated an effective SnO 2 Ph Electrode by the sputtering method. © 2004 Elsevier B.V. All rights reserved.
Shen-kan Hsiung - One of the best experts on this subject based on the ideXlab platform.
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Study on the Time-Dependent Slow Response of the Tin Oxide Ph Electrode
IEEE Sensors Journal, 2006Co-Authors: Chu-neng Tsai, Jung-chuan Chou, Tai-ping Sun, Shen-kan HsiungAbstract:It has been known that drift and hysteresis resulted from the slow response of the Ph Electrodes. These inherent drawbacks handicap the application of the Ph Electrodes. Thus, the time-dependent slow response of the tin oxide Ph Electrode was modeled by mathematical expression. In this study, the three time-constant model was utilized to fit the drift behavior of the tin oxide Ph Electrode. Besides combining with the three time-constant model and the concept of network analysis, the hysteresis model was derived. According to the experimental results, the modeled hysteresis width was close to the measured hysteresis width. The drift behavior and the hysteresis width of the tin oxide Ph Electrode were linked by the time-constant model. In other words, the hysteresis width can be predicted by the time-constant model of the drift behavior
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Study on the sensing characteristics and hysteresis effect of the tin oxide Ph Electrode
Sensors and Actuators B-chemical, 2005Co-Authors: Chu-neng Tsai, Jung-chuan Chou, Tai-ping Sun, Shen-kan HsiungAbstract:Abstract Tin oxide thin films prepared by the radio frequency sputtering method were used as Ph sensors based on the structure of the metal oxide Electrode. The sensing characteristics and the hysteresis effect of the tin oxide Ph Electrode were studied. The hysteresis experiments were carried out under short- and long-loop circles, Ph 7–4–7–10–7 and Ph 7–2–7–12–6, respectively. Moreover, the hysteresis value was less than 7 mV in short-loop circle and the hysteresis value of Ph 7 was 9 mV in acid side ( H A ) and 11 mV in alkali side ( H B ). The sensitivity of the tin oxide Ph Electrode was investigated between Ph 2 and 12, whose Ph sensitivity was about 59 mV/Ph.
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Development of the tin oxide Ph Electrode by the sputtering method
Sensors and Actuators B-chemical, 2004Co-Authors: Chung-we Pan, Jung-chuan Chou, Tai-ping Sun, Shen-kan HsiungAbstract:In previous investigations, different preparation methods of the Ph Electrode influenced Ph-sensing characteristics. Hence, this study attempted to employ the tin oxide (SnO2) membrane in fabricating a Ph Electrode by the sputtering method, whose substrate was based on the indium tin oxide (ITO) glass substrate, and employing the two-point calibration method proved the Ph-sensing characteristic. Furthermore, to define the effective sensing area of the Ph Electrode, experimental results and simulation results were employed. According to results, enough sensing area increased the Ph sensitivity stability of the Ph Electrode and 4 mm 2 was the effective sensing area in fabricating a SnO2 Ph Electrode. After the effective fabrication process was proved, the SnO 2 Ph Electrode had linear Ph response and higher stability as it compared with the commercial Ph glass Electrode. Consequently, this study investigated an effective SnO 2 Ph Electrode by the sputtering method. © 2004 Elsevier B.V. All rights reserved.
Dan Xiao - One of the best experts on this subject based on the ideXlab platform.
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Large enhancement of sensitivity and a wider working range of glass Ph Electrode with amperometric and potentiometric responses
Electrochimica Acta, 2011Co-Authors: Changming Cheng, Hongyan Yuan, Xianqing Tian, Yong Guo, Dan XiaoAbstract:Abstract In this communication, a new four-Electrode measurement system has been developed to improve the analytical performance of a glass Ph Electrode. The sensitivity of detection is greatly enhanced and the working range is widened. In this new configuration, the potentiometric response slope of the Ph Electrode, dE / d Ph, could be as high as −669 mV in the Ph range 4–10. Amperometric measurement could also be employed to monitor the Ph of aqueous solution and the response sensitivity ( dI / d Ph) is ∼67 nA. A two-signal ( i.e. , potential and current) synchronous detection technology has been exploited for Ph monitoring.
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All Solid-State Ph Electrode Based on Titanium Nitride Sensitive Film
Electroanalysis, 2006Co-Authors: Yan Wang, Hongyan Yuan, Zaide Zhou, Dan XiaoAbstract:Titanium nitride was used as Ph-sensitive material to fabricate all solid-state Ph Electrode. The fabrication and the response performance of the Ph Electrode were described in the paper. The TiN film Electrode showed a linear response in the Ph range of 2–12 with a near-Nenstian response (−55 mV/Ph). The response time was within 1 min, and the Electrode had good reproducibility, stability and low sensitivities for different species. Compared with the glass Ph Electrode, the Electrode exhibited some advantages, for example, without activation, rapid response and high mechanical strength. In addition, the Electrode performed excellently in a corrosion medium containing F−(1 M). Electrochemical behaviors of TiN Electrode in Britton-Robinson buffers were studied with Electrochemical Impedance Spectroscopy (EIS).
Marc J. Madou - One of the best experts on this subject based on the ideXlab platform.
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A long-term stable iridium oxide Ph Electrode
Sensors and Actuators B-chemical, 2001Co-Authors: Min Wang, Sheng Yao, Marc J. MadouAbstract:Abstract In this work, a long-term stable Ph Electrode based on iridium oxide film is reported. A new method, i.e., a ‘carbonate melt oxidation’ method, has been developed to fabricate iridium oxide Ph Electrode. In this method, a uniform iridium oxide film is coated on the surface of an iridium metal wire through oxidation of the wire in a carbonate melt. The Electrode made this way shows a “drift-free” behavior in Ph buffer solutions. Calibration curves for the same Electrode implied that the Electrode is very stable over a long period of 2.5 years. Therefore, the present Electrode is very suitable for continuous Ph measurement without the need of frequent calibration.
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a Ph Electrode based on melt oxidized iridium oxide
Journal of The Electrochemical Society, 2001Co-Authors: Sheng Yao, Min Wang, Marc J. MadouAbstract:Fabrication and characterization of a novel potentiometric Ph Electrode based on melt-oxidized iridium oxide film is presented. The oxide film produced in a lithium carbonate melt has the composition of and shows high chemical stability. The Electrode based on this oxide film exhibits very promising Ph sensing performance, with an ideal Nernstian response in the tested Ph range of 1 to 13. The potential response is fast, with a 90% response time obtained in less than 1 s for all Ph changes. The open-circuit potential of the Electrode is almost drift-free, with an average variation over time in a Ph 6.6 solution as small as 0.1 mV/day. Furthermore, the potential/Ph slopes and the apparent standard Electrode potentials show excellent agreement among Electrodes from the same batch. A comparison is made of the present Electrode and those reported in the literature with respect to fabrication method and Ph sensing characteristics. © 2001 The Electrochemical Society. All rights reserved.
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A Ph Electrode Based on Melt-Oxidized Iridium Oxide
Journal of The Electrochemical Society, 2001Co-Authors: Sheng Yao, Min Wang, Marc J. MadouAbstract:Fabrication and characterization of a novel potentiometric Ph Electrode based on melt-oxidized iridium oxide film is presented. The oxide film produced in a lithium carbonate melt has the composition of Li 3 IrO y nH 2 O, and shows high chemical stability. The Electrode based on this oxide film exhibits very promising Ph sensing performance, with an ideal Nernstian response in the tested Ph range of I to 13. The potential response is fast, with a 90% response time obtained in less than I s for all Ph changes. The open-circuit potential of the Electrode is almost drift-free, with an average variation over time in a Ph 6.6 solution as small as 0.1 mV/day. Furthermore, the potential/Ph slopes and the apparent standard Electrode potentials show excellent agreement among Electrodes from the same batch. A comparison is made of the present Electrode and those reported in the literature with respect to fabrication method and Ph sensing characteristics.
Min Wang - One of the best experts on this subject based on the ideXlab platform.
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capillary melt method for micro antimony oxide Ph Electrode
Electroanalysis, 2006Co-Authors: Yang Ha, Min WangAbstract:In this work, a new approach named “capillary melt method” was developed to fabricate micro antimony wires, and the wire surface was then oxidized in a nitrate melt at high temperature to obtain an antimony/antimony oxide Ph Electrode. Characterization results show that the oxide layer on the wire surface is porous, and consists of Sb2O3 crystal Phase. The Ph Electrode, made using this method, showed good sensing performance in buffer solutions in the tested Ph range of 2–12. Its EMF signal was found to have a linear relationship with Ph value of the solution, with a sensitivity of 54.1 mV/Ph and a fitting correlation coefficient of R2=1.00. The advantages of the Electrode are long-term stability, fast response, reproducibility and low cost.
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A long-term stable iridium oxide Ph Electrode
Sensors and Actuators B-chemical, 2001Co-Authors: Min Wang, Sheng Yao, Marc J. MadouAbstract:Abstract In this work, a long-term stable Ph Electrode based on iridium oxide film is reported. A new method, i.e., a ‘carbonate melt oxidation’ method, has been developed to fabricate iridium oxide Ph Electrode. In this method, a uniform iridium oxide film is coated on the surface of an iridium metal wire through oxidation of the wire in a carbonate melt. The Electrode made this way shows a “drift-free” behavior in Ph buffer solutions. Calibration curves for the same Electrode implied that the Electrode is very stable over a long period of 2.5 years. Therefore, the present Electrode is very suitable for continuous Ph measurement without the need of frequent calibration.
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a Ph Electrode based on melt oxidized iridium oxide
Journal of The Electrochemical Society, 2001Co-Authors: Sheng Yao, Min Wang, Marc J. MadouAbstract:Fabrication and characterization of a novel potentiometric Ph Electrode based on melt-oxidized iridium oxide film is presented. The oxide film produced in a lithium carbonate melt has the composition of and shows high chemical stability. The Electrode based on this oxide film exhibits very promising Ph sensing performance, with an ideal Nernstian response in the tested Ph range of 1 to 13. The potential response is fast, with a 90% response time obtained in less than 1 s for all Ph changes. The open-circuit potential of the Electrode is almost drift-free, with an average variation over time in a Ph 6.6 solution as small as 0.1 mV/day. Furthermore, the potential/Ph slopes and the apparent standard Electrode potentials show excellent agreement among Electrodes from the same batch. A comparison is made of the present Electrode and those reported in the literature with respect to fabrication method and Ph sensing characteristics. © 2001 The Electrochemical Society. All rights reserved.
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A Ph Electrode Based on Melt-Oxidized Iridium Oxide
Journal of The Electrochemical Society, 2001Co-Authors: Sheng Yao, Min Wang, Marc J. MadouAbstract:Fabrication and characterization of a novel potentiometric Ph Electrode based on melt-oxidized iridium oxide film is presented. The oxide film produced in a lithium carbonate melt has the composition of Li 3 IrO y nH 2 O, and shows high chemical stability. The Electrode based on this oxide film exhibits very promising Ph sensing performance, with an ideal Nernstian response in the tested Ph range of I to 13. The potential response is fast, with a 90% response time obtained in less than I s for all Ph changes. The open-circuit potential of the Electrode is almost drift-free, with an average variation over time in a Ph 6.6 solution as small as 0.1 mV/day. Furthermore, the potential/Ph slopes and the apparent standard Electrode potentials show excellent agreement among Electrodes from the same batch. A comparison is made of the present Electrode and those reported in the literature with respect to fabrication method and Ph sensing characteristics.