Development of New Simple Compositions of Silver Inks for the Preparation of Pseudo-Reference Electrodes

Author(s)

Camargo, Jessica R. ; Fernandes-Junior, Wilson S. ; Azzi, Deborah C. ; Rocha, Raquel G. ; Faria, Lucas, V ; Richter, Eduardo M. ; Munoz, Rodrigo A. A. ; Janegitz, Bruno C.

• Document type: Journal article
• Source: BIOSENSORS-BASEL; v. 12, n. 9, p. 17-pg., 2022-09-01.

Abstract

Silver materials are known to present excellent properties, such as high electrical and thermal conductivity as well as chemical stability. Silver-based inks have drawn a lot of attention for being compatible with various substrates, which can be used in the production uniform and stable pseudo-reference electrodes with low curing temperatures. Furthermore, the interest in the use of disposable electrodes has been increasing due to the low cost and the possibility of their use in point-of-care and point-of-need situations. Thus, in this work, two new inks were developed using Ag as conductive material and colorless polymers (nail polish (NP) and shellac (SL)), and applied to different substrates (screen-printed electrodes, acetate sheets, and 3D-printed electrodes) to verify the performance of the proposed inks. Measurements attained with open circuit potential (OCP) attested to the stability of the potential of the pseudo-reference proposed for 1 h. Analytical curves for beta-estradiol were also obtained using the devices prepared with the proposed inks as pseudo-references electrodes, which presented satisfactory results concerning the potential stability (RSD < 2.6%). These inks are simple to prepare and present great alternatives for the development of pseudo-reference electrodes useful in the construction of disposable electrochemical systems. (AU)

• FAPESP's process: 20/04189-4 - Disposable sensors with conductive ink based on graphite and shellac on waterproof paper for detection of sulfamethoxazole
• Grantee: Julia Melo Henrique
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• FAPESP's process: 19/23177-0 - Development of disposable devices with conductive inks and low cost substrates for the biosensing of hormonal dysfunctions and detection of Malaria
• Grantee: Jéssica Rocha Camargo
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
• FAPESP's process: 17/21097-3 - Bee-agriculture interactions: perspectives to sustainable use
• Grantee: Osmar Malaspina
• Support Opportunities: BIOTA-FAPESP Program - Thematic Grants
• FAPESP's process: 19/26953-0 - Electrochemical sensors and biosensors printed in 3D using graphene filament for detection of phenolic compounds
• Grantee: Wilson da Silva Fernandes Junior
• Support Opportunities: Scholarships in Brazil - Scientific Initiation