A New Sensor Based on Reduced Graphene Oxide/Au Nanoparticles for Glycerol Detection

Abstract

The projections for the global energy demand have been one of our society's greatest challenges, which has contributed significantly to the search for new sources of energy, among which biodiesel stands out and, consequently, the development of methods for quality assurance is essential to ensure its technological demand. In this context, a stable sensor based on graphene oxide and gold nanoparticles was developed for glycerol analysis. The electrochemically deposited gold nanoparticles presented the best results with a peak current (I p ) four times greater than the chemically produced gold nanoparticles. The combination of glassy carbon electrode with electrochemically reduced graphene and electrochemically deposited gold nanoparticles (GCE-ErGO-EAuNp) resulted in an efficient sensor to detect glycerol, promoting an I p increase. The proposed non-enzymatic method showed a linear response in the concentration range of 1.0 x 10 -3 to 1.0 x 10 -2% (w/w) with a good determination coefficient (r 2 = 0.9989), limits of detection and quantification at 1.2 x 10 -4% and 4.0 x 10 -4% (w/w), respectively, with a repeatability of (RSD% ranged from 0.36% to 2.78%), intermediate precision and recovery of (99.3% to 104.4%) and excellent stability of 700 continuous analysis cycles.

Simulation of a microstructure fiber glycerol sensor based on lossy mode resonance

“…Glycerol is a kind of organic matter which has the characteristics of colorless, odorless, sweet taste, and its appearance is clear viscous liquid. In nature, it exists in tobacco, beer, wine, honey, cocoa and so on [1,2]. Along with the development of industry, glycerin is also used in various fields, such as food industry, paint industry, printing and dyeing industry and pharmaceutical industry [2].…”

“…In nature, it exists in tobacco, beer, wine, honey, cocoa and so on [1,2]. Along with the development of industry, glycerin is also used in various fields, such as food industry, paint industry, printing and dyeing industry and pharmaceutical industry [2]. In recent years, glycerol concentration monitoring has also become an important method of biodiesel quality control and human health assessment, which has attracted wide attention.…”