Open AccessLight-Assisted Batch Injection Analysis of Glucose Exploiting a p-n-Homojunction Based on Cu2O
Author(s) -
Elenilse Cardoso,
Alan de Menezes,
Clenilton dos Santos,
Rita de Cássia Silva Luz,
Flávio Santos Damos
Publication year - 2022
Publication title -
journal of the brazilian chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.337
H-Index - 70
eISSN - 1678-4790
pISSN - 0103-5053
DOI - 10.21577/0103-5053.20210121
Subject(s) - homojunction , tin oxide , dielectric spectroscopy , light emitting diode , detection limit , materials science , raman spectroscopy , reproducibility , indium tin oxide , analytical chemistry (journal) , chemistry , electrode , electrochemistry , nanotechnology , doping , optoelectronics , chromatography , thin film , optics , physics
This work describes the development of a photoelectrochemical sensor for glucose quantification exploiting a light assisted-batch injection analysis (BIA) cell. A light-emitting diode (LED) lamp was employed to control the incidence of light on the p-Cu2O/n-Cu2O/fluorine-doped tin oxide (FTO) photoactive platform in BIA cell. The p-Cu2O/n-Cu2O/FTO platform was constructed by electrodepositing n-Cu2O and p-Cu2O and the characteristics of electrodeposited Cu2O films were investigated by X-ray diffraction (XRD), Raman spectroscopy, and electrochemical impedance spectroscopy. The light assisted-batch injection analysis of glucose based on the illuminated p-Cu2O/n-Cu2O/FTO photoelectrode presented a linear response of 10 μmol L-1-1 mmol L-1, a limit of detection of 4.0 μmol L-1, and sensitivity of 0.768 ± 0.011 μA L μmol-1 cm-2. The system presented an average recovery value of 96% when applied to the determination of glucose in an artificial saliva sample, which indicates that the incidence of light on photoelectroactive platforms is a promising approach for the determination and quantification of glucose.