Effect of oxygen terminated surface of boron-doped diamond thin-film electrode on seawater salinity sensing  

作　　者：Dan Shi Lusheng Liu Zhaofeng Zhai Bin Chen Zhigang Lu Chuyan Zhang Ziyao Yuan Meiqi Zhou Bing Yang Nan Huang Xin jiang 

机构地区：[1]Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang,110016,China [2]School of Materials Science and Engineering,University of Science and Technology of China,Shenyang,110016,China [3]Institute of Materials Engineering,University of Siegen,Paul-Bonatz-Str.9-11,Siegen,57076,Germany

出　　处：《Journal of Materials Science & Technology》2021年第27期1-10,共10页材料科学技术（英文版）

基　　金：financially supported by the Joint Research Fund Liaoning-Shenyang National Laboratory for Materials Science(No.20180510009);the Young Talent Program of Shenyang National Laboratory for Materials Science(No.L2019F39);the National Natural Science Foundation of China(No.51202257)。

摘　　要：Tremendous demands for highly sensitive and stable seawater salinometers have motivated intensive research on advanced electrode materials.Boron-doped diamond(BDD)is attractive in terms of its high mechanical stability and chemical inertness,but is usually hindered by its low double-layer capacitance(C_(dl))for seawater salinity detection.Here,inspired by the principle of oxygen-terminated BDD electrode endowing higher C_(dl)than hydrogen-terminated surface,we introduce the oxygen terminated surface by oxygen plasma or reactive ion etch(RIE),and the fabricated oxygen terminated BDD electrodes demonstrate high sensitivity and long-term stability in seawater salinity detection comparing with the hydrogen terminated BDD electrodes.Significantly,the as-fabricated O-BDD-RIE electrodes not only show remarkable enhanced response even better than the commercial platinum black electrodes but also display long-time stability which is weekly verified by continuous monitor for 90 days.The outstanding performance of the oxygen terminated BDD electrodes can be ascribed to the enhancement of C-O surface functional group on C_(dl).In addition,a comprehensive analysis of effective electroactive surface area(EASA)and C_(dl)proves that the surface oxygen is the major factor for the improved C_(dl).In summary,the excellent oxygen terminated BDD electrodes promise potential application in seawater salinity detection.

关 键 词：Boron-doped diamond CAPACITANCE Oxygen plasma Reactive ion etch Seawater salinity 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TQ163[自动化与计算机技术—控制科学与工程]