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Tuyển tập các báo cáo nghiên cứu khoa học trên tạp chí khoa học vật lý quốc tế đề tài: SCREEN-PRINTED POTASSIUM ION SENSOR FABRICATED FROM PHOTOCURABLE AND SELFPLASTICIZED ACRYLIC FILM | Journal of Physical Science Vol. 17 2 141-150 2006 141 SCREEN-PRINTED POTASSIUM ION SENSOR FABRICATED FROM PHOTOCURABLE AND SELFPLASTICIZED ACRYLIC FILM Sagir Alva Lee Yook Heng and Musa Ahmad School of Chemical Sciences and Food Technology Faculty of Science and Technology Universiti Kebangsaan Malaysia 43600 Bangi Selangor Darul Ehsan Malaysia Corresponding author yhl1000@pkrisc.cc.ukm.my Abstract Potassium ion sensor based on photocured poly n-butyl acrylate membrane has been fabricated on screen printed electrode SPE through a photocuring technique. The advantage of the fabrication method allows miniatured but two-dimensional sensor that is disposable to be designed. The potassium ion sensor yielded a Nernstian response i.e. 58.5 0.5 mV decade when the potassium ion concentrations were 10 1 105 I. The limit of detection was close to 2.5 0.57 X 106 M. The potassium ion SPE also demonstrated little interference from cations such as Co2 Mg2 Li and Na and good reproducibility with relative standard error of 0.81 n 4 . The sensors were applied to the analysis of potassium in urine and the results were compared with that of a conventional technique such as flame photometry. Keywords Potassium ion sensor plasticizer free acrylic membtane urine analysis Ag AgCI screen-printed electrode photopolymerization 1. INTRODUCTION Potassium ion sensors have many biomedical applications. They are used in the analysis of blood and urine potassium and cardiovascular research and monitoring. Obviously in cardiovascular applications the use of miniaturized ion-selective sensor is desirable thus requiring microfabrication of the sensor 1 . The most common ion-selective-electrode construction requires an ion-selective membrane of a polymeric type containing ionophore 2 . Poly vinyl chloride PVC is conventionally used as a membrane matrix. However PVC gave many problems when used in fabricating solid-state sensor. This is because PVC membrane has poor adhesion on solid substrate can .
