High-performance flexible potentiometric sensing devices using free-standing graphene paper

作者：Ping, Jianfeng; Wang, Yixian; Fan, Kai; Tang, Wenzhi; Wu, Jian^*; Ying, Yibin

来源：Journal of Materials Chemistry B, 2013, 1(37): 4781-4791.

DOI：10.1039/c3tb20664e

• ION-SELECTIVE ELECTRODES
• CARBON NANOTUBES
• GRAPHITE OXIDE
• SOLID-CONTACT
• NANOSHEETS
• FILMS
• SUPERCAPACITORS
• TRANSDUCERS
• POINT
• NANOPARTICLES

The development of cost-effective, robust, and rugged biochemical sensing devices is of great interest for point-of-care testing and on-spot monitoring. Here we reported a facile approach to build high-performance flexible potentiometric sensing devices by using free-standing graphene paper (GNP) as electrode substrate. The transduction mechanism of the GNP-based electrode was investigated systematically, revealing that GNP acts as both electric conductor and ion-to-electron transducer of the potentiometric signals. Three GNP-based ion-selective electrodes (GNP-ISEs) were constructed, which exhibited excellent potentiometric performance. Furthermore, a paper-type reference electrode (RE) was presented for the first time in which the photo-polymerised reference membrane is directly coated onto the GNP. Results show that the GNP-based RE (GNP-RE) displayed low potential variability for a wide range of biochemical species in a wide calibration range. On the basis of these excellent results, integrated potentiometric sensing devices using GNP-ISE and GNP-RE were built that possess comparable performance with common types of potentiometric detection system. High-performance, easy fabrication, low cost, and excellent flexibility make the GNP-based potentiometric sensing devices very attractive as 'vanguard analytical tools' for routine sensing applications.

• 出版日期2013
• 单位浙江大学