Assawapong Sappat, Research and Development, National Electronics and Computer Technology Center
Integrated Screen-printed Graphene-based Electrochemical Sensor and Electrowetting on Dielectrics for Electrochemical Application
Assawapong Sappat (1,*), Chanpen Karuwan (1), Tanom Lomas (1), and Adisorn Tuantranont (1)
(1) Thai Organic and Printed Electronics Innovation Center, National Electronics and Computer Technology Center, National Science and Technology Development Agency, 112 Thailand Science Park, Phahon Yothin Road, Klong 1, Klong Luang, Pathumthani, THAILAND
The printed electronics have been widely used in research field. The printing technique can be form many layer pattern for specific applications. In this work, we integrated the graphene electrochemical electrode and the electrowetting structures based on screen printing technique for applications in lab-on-a-chip  (see Fig. 1). The electrowetting structure included a glass substrate, conductive electrodes and dielectric/hydrophobic layers. The conductive electrodes was form the pattern by the conductive silver inks on glass substrate. A top coated Teflon fluoropolymer were used as hydrophobic layers. The electrochemical electrode was screen-printed graphene on electrowetting structure to form working and counter electrodes. Silver/silver chloride (Ag/AgCl) was then screen-printed to complete a reference electrode.
Figure 2 illustrates the cyclic voltammograms of Hydrogen peroxide (H2O2) with different concentrations. The oxidation peak current at 1 V of screen-printed graphene electrode is seen to monotonically increase with increasing H2O2 concentration from 20 to 100 µM. The results show that the graphene electrode with provides sensitive electrochemical measurement and is a promising candidate for electrochemical applications.
 X. Chen, T. He, H. Jiang, B. Wei, G. Chen, X. Fang, M. Jin, R. A. Hayes, G. Zhou and L. Shui, Display 37, 79-85 (2015).
Mr. Assawapong Sappat is a research assistant at the Thai Organic & Printed Electronics Innovation Center (TOPIC), National Electronics and Computer Technology Center (NECTEC), THAILAND, where he has been a member since 2008. He received his BS degree at Department of Electronic Engineering at King Mongkut’s Institute of Technology Ladkrabang, Thailand on 2006; the MSc degree at Department of Biomedical Engineering at King Mongkut’s Institute of Technology Ladkrabang, Thailand on 2012. His research interests include printed electronics, biosensors and electrochemical analysis.
The National Electronics and Computer Technology Center (NECTEC) was established on 16 September 1986 under the Ministry of Science, Technology and Energy (the former name of Ministry of Science and Technology). NECTEC was transformed into a national technology center under the National Science and Technology Development Agency (NSTDA), Ministry of Science and Technology. At present, NECTEC is a statutory government organisation with its main responsibilities of under taking, supporting and promoting the research and development of electronics and computer technologies. NECTEC also provides linkage between research communities and industries through the established industrial clusters and programmes.