A new sensor based on reduced graphene oxide/au nanoparticles for glycerol detection

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作者：
dos Santos Castro Assis, Kelly Leite [1 ,2 ]
Archanjo, Braulio S. [1 ]
Achete, Carlos Alberto [1 ]
D'Elia, Eliane [2 ]
机构：
[1] Instituto Nacional de Metrologia, Qualidade e Tecnologia, Divisão de Metrologia de materiais, Duque de Caxias, RJ, Brazil
[2] Universidade Federal do Rio de Janeiro, Instituto de Química, Rio de Janeiro, RJ,21941-909, Brazil
来源：
Materials Research | 2020年 / 23卷 / 02期
关键词：
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 (Ip) 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 Ip 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 (r2 = 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. © 2020 Universidade Federal de Sao Carlos. All rights reserved;
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