CdSe-Co3O4@TiO2 nanoflower–based photoelectrochemical platform probing visible light–driven virus detection

Abstract

The design and construction of a visible light-driven photoelectrochemical (PEC) device is described based on a CdSe-Co 3 O 4 @TiO 2 nanoflower (NF). Moreover, an application to the ultrasensitive detection of viruses, such as hepatitis E virus (HEV), HEV-like particles (HEV-LPs), and SARS-CoV-2 spike protein in complicated lysate solution, is demonstrated. The photocurrent response output of a PEC device based on CdSe-Co 3 O 4 @TiO 2 is enhanced compared with the individual components, TiO 2 and CdSe-Co 3 O 4 . This can be attributed to the CdSe quantum dot (QD) sensitization effect and strong visible light absorption to improve overall system stability. A robust oxygen-evolving catalyst (Co 3 O 4 ) coupled at the hole-trapping site (CdSe) extends the interfacial carrier lifetime, and the energy conversion efficiency was improved. The effective hybridization between the antibody and virus resulted in a linear relationship between the change in photocurrent density and the HEV-LP concentration ranging from 10 fg mL -1 to 10 ng mL -1 , with a detection limit of 3.5 fg mL -1 . This CdSe-Co 3 O 4 @TiO 2 -based PEC device achieved considerable sensitivity, good specificity, and acceptable stability and demonstrated a significant ability to develop an upgraded device with affordable and portable biosensing capabilities.

Determination of lead(II) in food samples using a functionalized paper‐based fluorescent sensor modified by carbon dots

“…Using a smartphone for fluorescence detection enhances the accessibility and portability of paper-based fluorometric devices [21].…”

“…Using a smartphone for fluorescence detection enhances the accessibility and portability of paper‐based fluorometric devices [21]. Smartphone cameras can capture and analyze the fluorescence emitted from the CDs, allowing real‐time and quantitative measurement of analyte concentrations.…”

Facile assembly of flexible quaternary SnO2/SrSnO3/Fe3O4/PVDF nanocomposites with tunable optical, electrical, and magnetic properties for promising magneto-optoelectronic applications

“…The size dependence of the electrical structure of semiconducting metal oxide has attracted a lot of research. By adjusting the size and complexity of individual components, it provides a versatile design for a wide range of devices and systems with specialized electrical properties 10 . In addition, numerous methods, such as changing the lattice planes, adding surface defects, expanding the active site, and creating the lattice mismatch through doping, can boost changes in the characteristics of metal oxide 11 .…”

A novel “turn-off” photoelectrochemical aptasensing platform for selective detection of tobramycin based on the Ti3C2–MoS2/BiOI heterojunction

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