期刊
SENSORS
卷 15, 期 3, 页码 6469-6482出版社
MDPI AG
DOI: 10.3390/s150306469
关键词
Ag; AgCl; reference electrode; pH sensor; graphene oxide; iridium oxide pH working electrode; potentiometer
资金
- National Research Foundation of Korea (NRF) [20110028861]
- Institute of Medical System Engineering (iMSE) of the Gwangju Institute of Science and Technology (GIST), Korea
- National Research Foundation of Korea [2011-0028861] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
In this study, we describe a novel solid-state thin-film Ag/AgCl reference electrode (SSRE) that was coated with a protective layer of graphene oxide (GO). This layer was prepared by drop casting a solution of GO on the Ag/AgCl thin film. The potential differences exhibited by the SSRE were less than 2 mV for 26 days. The cyclic voltammograms of the SSRE were almost similar to those of a commercial reference electrode, while the diffusion coefficient of Fe(CN)(6)(3-) as calculated from the cathodic peaks of the SSRE was 6.48 x 10(-6) cm(2)/s. The SSRE was used in conjunction with a laboratory-made working electrode to determine its suitability for practical use. The average pH sensitivity of this combined sensor was 58.5 mV/pH in the acid-to-base direction; the correlation coefficient was greater than 0.99. In addition, an integrated pH sensor that included the SSRE was packaged in a secure digital (SD) card and tested. The average sensitivity of the chip was 56.8 mV/pH, with the correlation coefficient being greater than 0.99. In addition, a pH sensing test was also performed by using a laboratory-made potentiometer, which showed a sensitivity of 55.4 mV/pH, with the correlation coefficient being greater than 0.99.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据