Issue 37, 2013

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

Abstract

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.

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

Supplementary files

Article information

Article type
Paper
Submitted
10 May 2013
Accepted
17 Jul 2013
First published
18 Jul 2013

J. Mater. Chem. B, 2013,1, 4781-4791

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

J. Ping, Y. Wang, K. Fan, W. Tang, J. Wu and Y. Ying, J. Mater. Chem. B, 2013, 1, 4781 DOI: 10.1039/C3TB20664E

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