Uncured Polydimethylsiloxane as Binder Agent for Carbon Paste Electrodes: Application to the Quantification of Propranolol

Abstract

This study describes the use of uncured polydimethylsiloxane (PDMS) as a binder agent to prepare carbon paste electrodes (CPEs). A comparative study between the properties of CPEs prepared with PDMS and mineral oil Nujol ® , the most common binder agent for CPEs, was carried out. Cyclic voltammetry, electrochemical impedance spectroscopy, and chronoamperometry showed that PDMS-CPEs presented higher electrical conductivity, active electrochemical area, and wider useful potential window compared with Nujol ®-CPEs. Moreover, PDMS-CPEs were more stable in aqueous mixtures containing 50% (v/v) of ethanol or methanol than Nujol ®-CPEs. PDMS-CPEs have also provided higher sensitivity and lower limit of detection to propranolol than Nujol ®-CPE. Therefore, this study demonstrated that PDMS is a promising alternative binder agent able to produce CPEs with superior chemical/electrochemical stability and improved analytical performance.

Low‐cost conductive films based on graphite and cellulose acetate as promising electroanalytical platforms

“…Table S3 shows the electrochemical responses of the composites from the same batch were reproducible (RSD = 10%) since the sensitivities of the sensors were not significantly compromised by using different electrodes. RSD close to this estimated value was reported in the literature for other types of carbon composites, 1,8,26,45,46 demonstrating the proposed material has acceptable reproducibility. The batch‐to‐batch reproducibility was poorer (RSD = 15%).…”

“…Carbon composites are widely used for numerous applications including chemical sensors, 1 supercapacitors, 2 and fuel cells 3 . The carbon paste electrodes are one of the main carbon composites used for electroanalytical applications 4 .…”

“…Paraffin, 6 epoxy, 7 mineral oils, and ionic liquids are examples of binders commonly used for the fabrication of carbon composites. Different carbon sources have also been used in the fabrication process of carbon composites including graphite, 1 carbon black, 8 and carbon nanotubes 9 . Among them, graphite is the most popular carbon source due to the combination of good electrical conductivity and low cost 10,11 .…”

The Application of Picein Wax Carbon Composite Electrode for Plant-Based Milk Profiling

“…Notably, it exhibited superior signal-to-noise ratios and demonstrated enhanced electrochemical activity when compared to the conventional carbon paste electrode, which relied solely on paraffin oil as the binder. The research outlined in [29] detailed the utilization of uncured polydimethylsiloxane (PDMS) as a binding agent in the construction of carbon paste electrodes. The investigation demonstrated that PDMS stands out as a promising alternative binder, characterized by enhanced chemical and electrochemical stability, leading to improved analytical performance.…”