Journal
NANOMATERIALS
Volume 11, Issue 3, Pages -Publisher
MDPI
DOI: 10.3390/nano11030739
Keywords
silver and gold nanoparticles; Rumex roseus; plant extract; electrochemical sensors; hydrogen peroxide; riboflavin
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This study reports the room-temperature synthesis of silver and gold nanoparticles using Rumex roseus plant extract as a reducing agent, and their application in developing electrochemical sensors. The nanoparticles were characterized by UV-Vis spectroscopy, TEM, and DLS, showing spherical morphology. The AgNPs-modified GCE was used for H2O2 detection, while the AuNPs-SPCE sensor was tested for RF sensing, demonstrating enhanced electrochemical performances.
The room-temperature synthesis of silver (AgNPs) and gold (AuNPs) nanoparticles from aqueous solution of AgNO3 and HAuCl4 respectively, using Rumex roseus (RR) plant extract as a reducing agent, is reported here for the first time. The nanoparticles obtained were characterized by UV-Vis spectroscopy, transmission electron microscopy (TEM) and dynamic light scattering (DLS). The formation of nanoparticles with spherical-shaped morphology was verified by TEM and confirmed by UV-Vis spectroscopy through the analysis of Ag and Au plasmon resonance peak and DLS measurements. New electrochemical sensors have been developed by employing the synthesized Ag and Au nanoparticles as modifiers of glassy carbon electrode (GCE) and screen-printed carbon electrode (SPCE), respectively. The AgNPs-modified GCE was investigated for the electrochemical determination of hydrogen peroxide (H2O2). Further enhancement of electrochemical performances was obtained using a nanocomposite made of AgNPs and reduced graphene oxide (rGO)-modified GCE. The AuNPs-SPCE sensor was instead tested in the electrochemical sensing of riboflavin (RF). To our knowledge, this is the first paper reporting Rumex roseus plant extract as a source for the synthesis of metal nanoparticles and their use for developing simple, sensitive and reliable electrochemical sensors for H2O2 and RF.
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