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A disposable cobalt-based phosphate sensor based on screen printing technology

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A disposable cobalt-based phosphate sensor based on screen printing technology

Content Provider	Springer Nature Link
Author	Song, Lei Zhu, Lei Liu, YanChen Zhou, XiaoHong Shi, HanChang
Copyright Year	2014
Abstract	Screen printing is a promising technology because of its simplicity, low-cost, high reproducibility, and efficiency in large-scale production. In this work, a cobalt-based phosphate sensor was successfully fabricated using the screen printing technology for the determination of phosphate concentration in the aqueous solution. The disposable sensor consists of a fully integrated cobalt (Co) electrode, which is a layer of carbon conductive ink (C) physically doped with Co powder, and Ag/AgCl reference electrode. The SEM images show that the morphology of the Co electrode changes after exposure to the phosphate solution, indicating that the expendable reaction exists during the measurement. At the Co/C ratio of 1:99, the cobalt-based phosphate sensor shows phosphate-selective potential response in the range of 10$^{−4}$ to 10$^{−1}$ mol/L, yielding a detection limit of 1×10$^{−5}$ mol/L and a slope of over 30 mV/decade in acidic solution (pH 4.5) for H$_{2}$PO$_{4}$ $^{−}$. The proposed screen-printed sensor also exhibited significant reproducibility with a small repeated sensing deviation (i.e., relative standard deviation (R.S.D.) of 0.5%) on a single sensor and a small electrode-to-electrode deviation (i.e., R.S.D.<3.2%). The recovery study of H$_{2}$PO$_{4}$ $^{−}$ in real wastewater samples gave values from 95.4% to 101.8%, confirming its application potential in the measurement of phosphate in real samples. Apart from its high selectivity, sensitivity, and stability comparable with a conventional bulk Co-wire electrode, the proposed phosphate sensor still yields many other advantages, such as low price, compactness, ease of use, and the possibility of integration with other analytical devices such as flow injection analysis.
Starting Page	1283
Ending Page	1290
Page Count	8
File Format	PDF
ISSN	16747291
Journal	Science in China Series B: Chemistry
Volume Number	57
Issue Number	9
e-ISSN	18691870
Language	English
Publisher	Science China Press
Publisher Date	2014-07-31
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	phosphate sensor cobalt screen printing potentiometry Chemistry/Food Science
Content Type	Text
Resource Type	Article
Subject	Chemistry

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