info:eu-repo/semantics/article
Enhanced electrocatalytic behaviour of gold electrodes modified with ZnO nanoparticles through organophosphonate chemistry
Fecha
2020-01Registro en:
Trujillo, Ricardo Matias; Dore, C.; Castro, L. E.; Grellet Bournonville, Carlos Froilan; Budeguer, Florencia; et al.; Enhanced electrocatalytic behaviour of gold electrodes modified with ZnO nanoparticles through organophosphonate chemistry; Elsevier Science; Applied Surface Science; 499; 1-2020; 1-9
0169-4332
CONICET Digital
CONICET
Autor
Trujillo, Ricardo Matias
Dore, C.
Castro, L. E.
Grellet Bournonville, Carlos Froilan
Budeguer, Florencia
Valdeón, Daniel Horacio
Tirado, Monica Cecilia
Sendín, Lorena Noelia
Filippone, María Paula
Madrid, Rossana Elena
Cattani Scholz, Ana
Resumen
Stable immobilization and homogenous distribution of ZnO nanostructures on solid substrates can play a fundamental role in developing nanostructured biosensing devices. In this work we studied how phosphonic acid-terminated self-assembled monolayers (SAMP of 1) can enhance the electrocatalytic behaviour of ZnO nanoparticles (NPs) immobilized on gold surface. It is well known that alkanethiols can form uniform and conformal monolayers on gold through the thiol group and it has already been shown that ZnO surface can be modified by organophosphonates. Here we focus on the application of this chemistry as a tool for the fabrication of designed architectures of ZnO nanostructures on gold electrodes. Successful surface modification was verified by atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), and contact angle measurements. Our results indicate the formation of highly stable arrays of ZnO nanoparticles. As a proof of concept, the novel electrodes developed were tested in electrochemical assays for the detection of the transgenic protein neomycin phosphotransferase II (NPTII), showing enhanced electrocatalytic stability in immunosensor applications. The target protein could be detected down to nanomolar level by using the difference in charge transfer resistance (ΔRct) recorded in impedance spectroscopy measurements.