Dual transduction of H2O2 detection using ZnO/laser-induced graphene composites
| Autor: | Florinda M. Costa, Alexandre F. Carvalho, António J. S. Fernandes, Jorge P. Moura, N. F. Santos, Joana Rodrigues, Julia Zanoni, Teresa Monteiro, Sónia O. Pereira |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Photoluminescence Laser-induced graphene 02 engineering and technology QD415-436 010402 general chemistry 01 natural sciences Biochemistry Analytical Chemistry law.invention law H2O2 sensing Irradiation Physical and Theoretical Chemistry Composite material Detection limit Graphene electrochemical properties 021001 nanoscience & nanotechnology biosensors laser-induced graphene 0104 chemical sciences Dielectric spectroscopy Biosensors Electrochemical properties ZnO photoluminescence Cyclic voltammetry 0210 nano-technology Biosensor Polyimide |
| Zdroj: | Chemosensors Volume 9 Issue 5 Repositório Científico de Acesso Aberto de Portugal Repositório Científico de Acesso Aberto de Portugal (RCAAP) instacron:RCAAP Chemosensors, Vol 9, Iss 102, p 102 (2021) |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|