Please use this identifier to cite or link to this item: http://hdl.handle.net/10773/31785
Title: Dual transduction of H2O2 detection using ZnO/laser-induced graphene composites
Author: Zanoni, Julia
Moura, Jorge P.
Santos, Nuno F.
Carvalho, Alexandre F.
Fernandes, António J. S.
Monteiro, Teresa
Costa, Florinda M.
Pereira, Sónia O.
Rodrigues, Joana
Keywords: ZnO
Laser-induced graphene
Photoluminescence
Electrochemical properties
H2O2 sensing
Biosensors
Issue Date: 5-May-2021
Publisher: MDPI
Abstract: Zinc oxide (ZnO)/laser-induced graphene (LIG) composites were prepared by mixing ZnO, grown by laser-assisted flow deposition, with LIG produced by laser irradiation of a polyimide, both in ambient conditions. Different ZnO:LIG ratios were used to infer the effect of this combination on the overall composite behavior. The optical properties, assessed by photoluminescence (PL), showed an intensity increase of the excitonic-related recombination with increasing LIG amounts, along with a reduction in the visible emission band. Charge-transfer processes between the two materials are proposed to justify these variations. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy evidenced increased electron transfer kinetics and an electrochemically active area with the amount of LIG incorporated in the composites. As the composites were designed to be used as transducer platforms in biosensing devices, their ability to detect and quantify hydrogen peroxide (H2O2) was assessed by both PL and CV analysis. The results demonstrated that both methods can be employed for sensing, displaying slightly distinct operation ranges that allow extending the detection range by combining both transduction approaches. Moreover, limits of detection as low as 0.11 mM were calculated in a tested concentration range from 0.8 to 32.7 mM, in line with the values required for their potential application in biosensors.
Peer review: yes
URI: http://hdl.handle.net/10773/31785
DOI: 10.3390/chemosensors9050102
Publisher Version: https://www.mdpi.com/2227-9040/9/5/102
Appears in Collections:CICECO - Artigos
DFis - Artigos
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