Printable and flexible graphene pH sensors utilising thin film melanin for physiological applications

Author(s)

Tehrani, Z. ^{[1, 2]} ; Whelan, S. P. ^{[1, 2]} ; Mostert, A. B. ^[3] ; Paulin, V, J. ; Ali, M. M. ^[1] ; Ahmadi, E. Daghigh ^[1] ; Graeff, C. F. O. ^[4] ; Guy, O. J. ^[3] ; Gethin, D. T. ^[2]

Affiliation

^[1] Swansea Univ, Coll Engn, Ctr Nano Hlth, Swansea SA2 8PP, W Glam - Wales

^[2] Swansea Univ, Coll Engn, Welsh Ctr Printing & Coating, Swansea SA1 8EN, W Glam - Wales

^[3] Swansea Univ, Coll Sci, Dept Chem, Swansea SA2 8PP, W Glam - Wales

^[4] Sao Paulo State Univ UNESP, Sch Sci, Dept Phys, Bauru, SP - Brazil

• Document type: Journal article
• Source: 2D MATERIALS; v. 7, n. 2 APR 2020.
• Web of Science Citations: 0

Abstract

The application of highly sensitive pH sensors manufactured in volume at low cost has great commercial interest due to an extensive array of potential applications. Such areas include industrial processing, biotechnology and medical diagnostics particularly in the development of point of care (POC) devices. A novel printable electrochemical pH sensor based on graphene and pigment melanin (PGM), was designed and produced by using a screen printing process that enables up scaling for potential commercial application. We demonstrate a highly sensitive pH sensor (62 mV pH(-1) +/- 7) over a pH range from 5 to 8, with high stability and superior performance when compared with a number of existing devices and making it suitable for physiological applications. (AU)

• FAPESP's process: 15/23000-1 - Vertical organic field-effect transistor using dyes of natural origin as active layer
• Grantee: João Vitor Paulin
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 18/02411-1 - Proton injecting systems based on melanin derivatives
• Grantee: João Vitor Paulin
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate