TY - JOUR
T1 - Electrochemical properties of Rubpy-reduced graphene oxide synergized by ultrasonication for label-free quercetin sensing
AU - Arumugasamy, Shiva Kumar
AU - Kanagavalli, Pandiayaraj
AU - Veerapandian, Murugan
AU - Jayaraman, Mathiyarasu
AU - Yun, Kyusik
N1 - Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2021/1/30
Y1 - 2021/1/30
N2 - Tuning the interfacial properties of oxygenated graphene and reduced graphene oxide (rGO) with optical/electrochemically active molecules are highly useful for sensor studies. Herein, we demonstrate the ultrasonochemical mediated simultaneous reduction of oxygenated graphene and adsorption of ruthenium bipyridine complex (Rubpy) on the planes of rGO nanosheets. Different weight percentage ratio of Rubpy was decorated on the planes of rGO by simple alteration in the sonication parameters. Intercalation of Rubpy complex influences the electron cloud of inherent graphitic carbon network and intermolecular oxygenated functional moieties on the rGO matrix. Activation of C[dbnd]N network derived from bipyridine ligands of organometallic coordination compound, Rubpy, on the rGO planes enable an amplified electron mobility at the interface of electrode beneficial for electrocatalytic analysis. rGO-Rubpy modified electrode enabled direct electrochemical redox reaction of quercetin, exhibiting a linear detection range of 0.05–50 µM, with a lowest detection limit of 0.002 µM. Demonstrated label-free sensor platform display selectivity toward quercetin even in the presence of interferents and sensitivity in the real sample, promising for complementary analytical application.
AB - Tuning the interfacial properties of oxygenated graphene and reduced graphene oxide (rGO) with optical/electrochemically active molecules are highly useful for sensor studies. Herein, we demonstrate the ultrasonochemical mediated simultaneous reduction of oxygenated graphene and adsorption of ruthenium bipyridine complex (Rubpy) on the planes of rGO nanosheets. Different weight percentage ratio of Rubpy was decorated on the planes of rGO by simple alteration in the sonication parameters. Intercalation of Rubpy complex influences the electron cloud of inherent graphitic carbon network and intermolecular oxygenated functional moieties on the rGO matrix. Activation of C[dbnd]N network derived from bipyridine ligands of organometallic coordination compound, Rubpy, on the rGO planes enable an amplified electron mobility at the interface of electrode beneficial for electrocatalytic analysis. rGO-Rubpy modified electrode enabled direct electrochemical redox reaction of quercetin, exhibiting a linear detection range of 0.05–50 µM, with a lowest detection limit of 0.002 µM. Demonstrated label-free sensor platform display selectivity toward quercetin even in the presence of interferents and sensitivity in the real sample, promising for complementary analytical application.
KW - Opto-electrochemical material
KW - Quercetin redox reaction
KW - rGO sensitization
KW - Rubpy intercalation
KW - Ultrasonochemical surface modification
UR - http://www.scopus.com/inward/record.url?scp=85090953071&partnerID=8YFLogxK
U2 - 10.1016/j.apsusc.2020.147777
DO - 10.1016/j.apsusc.2020.147777
M3 - Article
AN - SCOPUS:85090953071
SN - 0169-4332
VL - 537
JO - Applied Surface Science
JF - Applied Surface Science
M1 - 147777
ER -