Comparison of amperometric biosensors fabricated by palladium sputtering, palladium electrodeposition and Nafion/carbon nanotube casting on screen-printed carbon electrodes

Biosensors & Bioelectronics
Chung-Hun LeeKu-Shang Chang

Abstract

Different strategies, including palladium electrodeposition (Pd(CV)), Pd sputtering (Pd(S)) and Nafion-solubilized carbon nanotube casting (Nafion/CNT), were used to modify screen-printed carbon electrodes (SPCEs) for the fabrication of amperometric enzyme biosensors. The electrochemical properties of the bare and modified SPCEs and the optimal conditions for surface modification were determined. The electrochemical response of the bare SPCE to H(2)O(2) under the potential of 0.3 V could be improved about 100-fold by Pd modification by electrodeposition or sputtering. By contrast, the electrochemical response of the bare SPCE was enhanced by only about 11-fold by Nafion/CNT casting. Moreover, the Pd(CV)-SPCEs exhibited better reproducibility of electrochemical response (a relative standard deviation (R.S.D.)<6.0%) than freshly prepared Pd(S)-SPCEs (R.S.D.>10%). The glucose biosensor fabricated from Pd-modified electrodes could be stored for up to 108 days without loosing significant activity. The Pd(CV)-SPCE also showed very reliable signal characteristics upon 50 consecutively repeated measurements of ascorbic acid. The electrocatalytic detection of the Pd-SPCE was combined with additional advantages of resistance to surface f...Continue Reading

Citations

May 12, 2009·Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry·Junhua LiRongying Zeng
Sep 25, 2015·Chemical Reviews·Aicheng Chen, Cassandra Ostrom
Jan 27, 2009·Clinica Chimica Acta; International Journal of Clinical Chemistry·Cheng-Teng HsuJyh-Myng Zen
Mar 11, 2010·Critical Reviews in Biotechnology·Christina G Siontorou, Fragiskos A Batzias
Dec 3, 2008·Analytical Chemistry·Cheng-Teng HsuJyh-Myng Zen
Oct 6, 2018·ACS Applied Materials & Interfaces·Matthew BurtonIris Nandhakumar
May 10, 2008·Chemical Reviews·Adam Heller, Ben Feldman

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