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In situ electrochemical regeneration of nanogap hotspots for continuously reusable ultrathin SERS sensors.

Nat Commun

March 2024

NanoPhotonics Centre, Cavendish Laboratory, Department of Physics, JJ Thompson Avenue, University of Cambridge, Cambridge, CB3 0HE, UK.

Surface-enhanced Raman spectroscopy (SERS) harnesses the confinement of light into metallic nanoscale hotspots to achieve highly sensitive label-free molecular detection that can be applied for a broad range of sensing applications. However, challenges related to irreversible analyte binding, substrate reproducibility, fouling, and degradation hinder its widespread adoption. Here we show how in-situ electrochemical regeneration can rapidly and precisely reform the nanogap hotspots to enable the continuous reuse of gold nanoparticle monolayers for SERS.

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Enhanced photocatalytic ammonia oxidation activity and nitrogen selectivity over Ag/AgCl/N-TiO photocatalyst.

J Environ Sci (China)

April 2024

College of Environmental Engineering, Henan University of Technology, Zhengzhou 450001, China; Department of Chemistry, Tsinghua University, Beijing 100084, China. Electronic address:

The removal of ammonia (NH) emitted from agricultural and industrial activities is of great significance to protect human health and ecological environment. Photocatalytic NH oxidation to N under mild conditions is a promising strategy. However, developing visible light photocatalysts for NH oxidation is still in its infancy.

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Sphere-rod-like Ag/AgCl@FeO Z-scheme heterojunction as photocatalysts for efficient degradation of tetracycline under visible light irradiation.

Chemosphere

January 2024

Ministry Key Laboratory of Oil and Gas Fine Chemicals, School of Chemical Engineering and Technology, Xinjiang University, Urumqi, 830046, China; College of Physics and Center of Quantum Materials & Devices, Chongqing University, Chongqing, 401331, China. Electronic address:

Integration of multi-functional components into one is urgent for creating a viable platform to improve photocatalytic efficiency for environmental treatment. Here, MIL-88B-NH (Fe) was firstly employed to capture Ag cation for the formation of AgCl@MIL-88B-NH (Fe), and then turned into the strongly coupled Ag/AgCl@FeO with sphere-rod-like structure. As prepared Z-scheme Ag/AgCl@FeO heterojunction exhibited outstanding photocatalytic performance of tetracycline (TC) with a removal efficiency of 94.

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Building Z-scheme heterojunctions with an electron bridge is a favored function for increasing photocatalytic activity. A facile approach for preparing g-CN/Ag@AgCl ternary heterojunctions by co-precipitation and photoreduction was established in this work. First, via co-precipitation, AgCl was modified on the surface of g-CN to create a broad contact area between AgCl and g-CN.

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Gold nanoparticles (AuNPs) possess remarkable optical properties and electrical conductivity, making them highly relevant in various fields such as medical diagnoses, biological imaging, and electronic sensors. However, the existing methods for modulating the optical properties of AuNPs are often under limitations such as a high cost, the complexity of detection, a narrow range of application settings, and irreversibility. In this study, we propose a novel approach to address these challenges by constructing a reversible electrochemical switch.

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