title: Synergy between Printex nano-carbons and silver nanoparticles for sensitive estimation of antioxidant activity.
abstract: We report on the synthesis, characterization and applications of a Printex L6 carbon-silver hybrid nanomaterial (PC-Ag), which was obtained using a polyol method. In addition, we also highlight the use of Printex L6 nano-carbon as a much cheaper alternative to the use of carbon nanotubes and graphene. The silver nanoparticles (AgNP) were prepared directly on the surface of the Printex 6L carbon "nanocarbon" material using ethylene glycol as the reducing agent. The hybrid nanomaterial was characterized by High-angle annular dark-field transmission electron microscopy (HAADF-TEM), energy-dispersive X-ray spectroscopy (EDX), selected area electron diffraction (SAED), Raman spectroscopy and cyclic voltammetry. Optimized electrocatalytic activity on glassy carbon electrode was reached for the architecture GC/PC-Ag, the silver nanoparticles with size ranging between 1 and 2 nm were well-distributed throughout the hybrid material. The synergy between PC nano-carbons and AgNPs was verified by detection of gallic acid (GA) at a low applied potential (0.091 V vs. Ag/AgCl). GA detection was performed in a concentration range between 5.0 × 10(-7) and 8.5 × 10(-6) mol L(-1), with a detection limit of 6.63 × 10(-8) mol L(-1) (66.3 nmol L(-1)), which is considerably lower than similar devices. The approach for fabricating the reproducible GC/PC-Ag electrodes is entirely generic and may be explored for other types of (bio)sensors and devices.
authors.affiliation: Instituto de Química de São Carlos, Universidade de São Paulo, São Carlos, São Paulo, CEP 13566-590, Brazil. Electronic address: pauloaugustoraymundopereira@gmail.com.
authors.forename: Paulo A
authors.initials: PA
authors.lastname: Raymundo-Pereira
authors.affiliation: Instituto de Química de São Carlos, Universidade de São Paulo, São Carlos, São Paulo, CEP 13566-590, Brazil.
authors.forename: Anderson M
authors.initials: AM
authors.lastname: Campos
authors.affiliation: Instituto de Química de São Carlos, Universidade de São Paulo, São Carlos, São Paulo, CEP 13566-590, Brazil.
authors.forename: Thiago M
authors.initials: TM
authors.lastname: Prado
authors.affiliation: Faculdade de Ciências e Tecnologia, UNESP Univ Estadual Paulista, 19060-900 Presidente Prudente, São Paulo, Brazil.
authors.forename: Leonardo N
authors.initials: LN
authors.lastname: Furini
authors.affiliation: Instituto de Química de São Carlos, Universidade de São Paulo, São Carlos, São Paulo, CEP 13566-590, Brazil.
authors.forename: Naiza V
authors.initials: NV
authors.lastname: Boas
authors.affiliation: Instituto de Química de São Carlos, Universidade de São Paulo, São Carlos, São Paulo, CEP 13566-590, Brazil.
authors.forename: Marcelo L
authors.initials: ML
authors.lastname: Calegaro
authors.affiliation: Instituto de Química de São Carlos, Universidade de São Paulo, São Carlos, São Paulo, CEP 13566-590, Brazil.
authors.forename: Sergio A S
authors.initials: SA
authors.lastname: Machado
mesh_terms: D000975:Antioxidants / Q000494:pharmacology*; D002244:Carbon / Q000737:chemistry*; D002849:Chromatography, Gas; D046529:Microscopy, Electron, Transmission; D053758:Nanoparticles / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*; D013057:Spectrum Analysis / Q000379:methods
chemical_list: D000975:Antioxidants; D012834:Silver; D002244:Carbon
keywords: Hybrid material; Polyphenols estimation; Printex L6 carbon; Sensing; Silver nanoparticles; Wine