University of North Florida
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Contact Info

Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Email: schalk@unf.edu
Website: @unf

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Tse C. Chou

Abbrev:
Chou, T.C.
Other Names:
Tse Chuan Chou, Tse-Chuan Chou
Address:
Department of Chemical Engineering, National Cheng Kung University, Tainan 701, Taiwan
Phone:
+886-6-2757575 x62639
Fax:
+886-6-2366838

Citations 4

"Ultrasonic Irradiation Effect In The Impregnation-reduction Process Of Preparing Pt/Nafion(R) NH4+ Sensor"
Ultrason. Sonochem. 2001 Volume 8, Issue 1 Pages 41-47
HungSen Twu, TzongRong Ling, TseChuan Chou and MingChang Yang

Abstract: A systematic study on the ultrasonic irradiation effect in the impregnation-reduction (I-R) process for preparing a Pt/Nafion(R) electrode was carried out in a flow injection system of ammonium ion detection. Both the impregnation and the reduction stages were affected by ultrasonic irradiation which increased the sensing currents of electrodes. Moreover, the effect of ultrasonic irradiation was found more significant in the reduction process than in the impregnation process. The relationship between sensing current and power of ultrasonic irradiation was also obtained. The specific active surface area of the Pt/Nafion(R) electrodes were evaluated by the cyclic voltametric technique. Meanwhile, the surfaces of the electrodes were characterized by XRD and SEM.

"Promotion Of Pt/Nafion NH4+ Sensor By Ultrasonic Treatment"
Proc. Electrochem. Soc. 1999 Volume 23, Issue 1 Pages 21-30
Chou, T.C.;Twu, H.S.;Ling, T.R.

Abstract: The effect of ultrasonic irradn. on the preparation of platinum-SPE (solid polymer electrolyte) electrode was investigated in a flow injection system of ammonium ion detection. The duty cycle and power level of ultrasonic irradn. for prepg. the electrode were found to have optimum sensitivity of ammonium ion. Ultrasonic irradn. not only strongly affects on the response of ammonium ion of the prepared electrodes, but also influences the active surface area of Pt coated on SPE electrode. The max. active surface area of Pt coated on SPE was significantly affected by both the applying duty cycle and power level for prepg. electrode. The surfaces of the electrodes were characterized by cyclic voltammetric technique and S.E.M. The recovery time of the electrodes affected by the ultrasonic irradn. was at least 1.5 times shorter than that of the electrode prepared without ultrasonic irradn.

"Pt/Nafion/Pt Electrode Applied To Ammonium Ion Sensor"
Proc. Electrochem. Soc. 1999 Volume 13, Issue 1 Pages 398-408
T. C. Chou, K. W. Chiou, H. S. Twu, and T. R. Ling

Abstract: Pt/Nafion/Pt electrode prepared by impregnation reduction method was carried out to monitor ammonium ion concentration. in a flow injection system. The current response of the electrode was examined by step change of ammonium ion solution The best sensing condition was determined The preparation conditions of the Pt/Nafion/Pt electrode including impregnation time, temp., and concentration of Pt-solution were optimized, meanwhile, the reducing agent concentration. and its pH value were changed to obtain the max. response current. Different electrolytes were employed to the electrode to compare their performance of sensitivity. The interference of chloride, nitrate, and acetate anions were studied for evaluating their selectivity coefficients to NH3 ion. The sensing mechanism of the electrode on detecting ammonium ion is also discussed.
Ammonium Electrode Interferences Optimization

"Immobilized Ionophore Calcium Ion Sensor Modified By Montmorillonite"
Electroanalysis 2000 Volume 12, Issue 6 Pages 468-470
Shih-Han Wang, Tse-Chuan Chou

Abstract: The effect of montmorillonite on the preparation of a calcium ion electrode was studied by combining and immobilization of ionophore and montmorillonite into a polymer membrane. Two types of electrodes to detect calcium ion concentrations were also compared. The results indicated that the montmorillonite-modified electrode exhibited higher performance than that without montmorillonite. The relationship between the potential and calcium ion concentration was obtained and the testing range of calcium ion concentration was from 4 x 10^-6 - 10^-1 M. The selectivity, reproducibility, and stability of modified electrodes with montmorillonite were better than electrode without montmorillonite. The optimal amount of the montmorillonite was 24.8 wt.%.