[Ru(bpy)₃]²⁺@Ce-UiO-66/Mn:Bi₂S₃ Heterojunction and Its Exceptional Photoelectrochemical Aptasensing Properties for Ofloxacin Detection

Abstract

A photoelectrochemical (PEC) aptasensor on basis of [Ru(bpy) 3 ] 2+ @Ce-UiO-66/Mn:Bi 2 S 3 composites was constructed for detecting ofloxacin (OFL). First, Ce-UiO-66, prepared by a solvothermal method, had Zr 4+ −Zr 3+ and Ce 4+ −Ce 3+ intervalence cycles to increase the charge separation efficiency. Subsequently, Ce-UiO-66 was further modified by [Ru(bpy) 3 ] 2+ and Mn:Bi 2 S 3 cosensitization to improve the photoelectric activity. [Ru(bpy) 3 ] 2+ not only broadened the range of light absorbed but also reacted with an electron donor to maintain the photoelectric conversion process. Among the [Ru(bpy) 3 ] 2+ @Ce-UiO-66/Mn:Bi 2 S 3 heterojunction, Mn:Bi 2 S 3 was a photosensitizer, which maximized the efficiency of the electron−hole separation and significantly improved photocurrent. Then, an aptamer was used as a biorecognition unit for OFL-specific detection. Under the best conditions, the PEC aptasensor realized the sensitive detection of OFL, with a detection range of 0.01−100 nmol/L and a detection limit of 6 pmol/L. In addition, the constructed PEC OFL sensor showed good reproducibility, stability, and specificity.

Synthesis of Nanostructured Bismuth Sulfide with Controllable Morphology for Advanced Lithium/Sodium-Ion Storage

“…Metal sulfides, for example, Co 1– x S, Ni 2 S 3 , VS 4 , SnS, , SnS 2 , , MoS 2 , , ZnS, and Fe 7 S 8 , with the advantages of low cost, considerable electrical conductivity, and excellent capacity, are potential anode materials in the fields of LIBs and SIBs. , Specifically, Bi 2 S 3 as one of the chalcogen-based materials with a narrow direct band gap of 1.3 eV and a laminar structure shows potential applications in many fields such as photoelectricity, biology, photocatalysis, and electrocatalysis . Recently, Bi 2 S 3 has also been proven to have bright application prospects in lithium and sodium storage.…”

Recent advances in photoelectrochemical platforms based on porous materials for environmental pollutant detection

“…In 2021, Feng et al synthesized [Ru(bpy) 3 ] 2+ @Ce-UiO-66/Mn:Bi 2 S 3 composites and utilized them to construct aptamer-based PEC sensors for ofloxacin (OFL) detection. 98 Ce-UiO-66 MOFs were obtained by doping UiO-66 with Ce-elements. The cycling of Zr 4+ –Zr 3+ and Ce 4+ –Ce 3+ in porous Ce-UiO-66 enhanced charge separation efficiency.…”

In Situ Growth Reaction on Photoelectrodes of Single-Atom Fe Incorporated Bi4O5I2: A General Photoelectrochemical Immunoassay Toward Sensitive Protein Analysis

“…Photoelectrochemical (PEC) sensor, which integrates photochemistry with electrochemistry, − has been broadly applied in environmental monitoring, biomedicine, food safety, and other fields. In PEC detection, photocurrent signal is mainly derived from photoelectric conversion of photoactive materials.…”