Modification of graphene on ultramicroelectrode array and its application in detection of dissolved oxygen

Jinfen Wang; Chao Bian; Jianhua Tong; Jizhou Sun; Yang Li; Wen Hong; Shanhong Xia

doi:10.3390/s150100382

Modification of graphene on ultramicroelectrode array and its application in detection of dissolved oxygen

Sensors (Basel). 2014 Dec 26;15(1):382-93. doi: 10.3390/s150100382.

Authors

Jinfen Wang¹, Chao Bian², Jianhua Tong³, Jizhou Sun⁴, Yang Li⁵, Wen Hong⁶, Shanhong Xia⁷

Affiliations

¹ State Key Laboratory of Transducer Technology, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China. binfen328@163.com.
² State Key Laboratory of Transducer Technology, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China. cbian@mail.ie.ac.cn.
³ State Key Laboratory of Transducer Technology, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China. jhtong@mail.ie.ac.cn.
⁴ State Key Laboratory of Transducer Technology, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China. sunjizhou628@163.com.
⁵ State Key Laboratory of Transducer Technology, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China. math101@163.com.
⁶ National Key Laboratory of Microwave Imaging Technology, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China. grad.mitl@mail.ie.ac.cn.
⁷ State Key Laboratory of Transducer Technology, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China. shxia@mail.ie.ac.cn.

Abstract

This paper investigated two different modification methods of graphene (GN) on ultramicroelectrode array (UMEA) and applied the GN modified UMEA for the determination of dissolved oxygen (DO). The UMEAs were fabricated by Micro Electro-Mechanical System (MEMS) technique and the radius of each ultramicroelectrode is 10 μm. GN-NH2 and GN-COOH were modified on UMEA by using self-assembling method. Compared with GN-NH2 modified UMEA, the GN-COOH modified UMEA showed better electrochemical reduction to DO, owing to better dispersing and more active sites. The GN-COOH on UMEA was electroreduced to reduced GN-COOH (rGN-COOH) to increase the conductivity and the catalysis performance. Finally, the palladium nanoparticles/rGN-COOH composite was incorporated into DO microsensor for the detection of DO.