[3PS-230]
A Multicomponent Nanostructured Photoelectrochemical Sensor for Protein Biomarker Detection under Visible-Light Illumination
발표자임석진 (경북대학교)
연구책임자박진영 (경북대학교)
Abstract
A photoelectrochemical sensing platform based on an FTO/SnO2 nanowire (NW)/Fe2O3 nanoflake (NFs)/g-C3N4 quantum dots (QDs) heterostructure is presented for sensitive protein biomarker detection under visible-light illumination using a molecularly imprinted polymer (MIP). SnO2 NW provides efficient electron transport by shortening electron diffusion length. Fe2O3 NF act as a visible-light absorber and suppress charge recombination by reducing hole diffusion length. g-C3N4 QDs form localized heterojunctions on Fe2O3 NF and enhance photogenerated charge separation. This multicomponent structure amplifies photoelectrochemical signals and improves detection sensitivity. SnO2 NW were grown by a hydrothermal process. Fe2O3 NF were obtained by annealing spin-coated FeOOH layers. g-C3N4 QDs were introduced by spin-coating and MIP films were electropolymerized on the photoelectrode. The sensing performance was evaluated by chronoamperometry under intermittent visible-light illumination.