Integrated Design of a Dual-Mode Colorimetric Sensor Driven by Enzyme-like Activity Regulation Strategy for Ultratrace and Portable Detection of Hg²⁺

Nanozymes: powerful catalytic materials for environmental pollutant detection and degradation

“…On the one hand, the formed Hg–X bond can result in a series of changes in surface charge, metal valence, and electron transfer, ultimately facilitating the nanozyme-catalyzed reactions. 60–63 In a representative example, Luo and co-workers designed a bimodal colorimetric sensor driven by enzyme-mimicking activity regulation for toxic Hg 2+ determination. 60 They synthesized a hollow structure CuS@CuSe@PVP with both peroxidase- and oxidase-like activities.…”

“…60–63 In a representative example, Luo and co-workers designed a bimodal colorimetric sensor driven by enzyme-mimicking activity regulation for toxic Hg 2+ determination. 60 They synthesized a hollow structure CuS@CuSe@PVP with both peroxidase- and oxidase-like activities. Mechanism experiments revealed that Hg 2+ could bind with the nanozyme via forming a Hg–Se bond, increasing the relative content of Cu 2+ to generate a beneficial Cu 2+ /Cu + ratio for accelerating electron transfer.…”

Red-Emitting AIEE-Active Rhodamine-Based Ionic Liquid for the Ultrasensitive and Selective Detection of Mercury Ions

“…High sensitivity and selectivity, real-time detection, visibility to the unaided eye, and ease of access are just a few of the appealing benefits of fluorescent probes. 19,20 Rhodamine-based fluorescent chemosensors have recently drawn a lot of interest because of their ease of synthesis, low detection threshold, capacity for precise recognition, and outstanding spectroscopic properties. 21 For instance, in the presence of a certain metal ion, rhodamine B with a spiro lactam-ring moiety was changed to the open-ring form, which resulted in an evident change in fluorescence properties.…”

“…As a result, it is regrettable that these methods are difficult to be promoted for practical applications. , On the other hand, fluorescent probes for metal ion detection have been promoted over the years to address these drawbacks. High sensitivity and selectivity, real-time detection, visibility to the unaided eye, and ease of access are just a few of the appealing benefits of fluorescent probes. , …”

Highly Selective and Portable Fluorescence Turn-On Detection of Sc3+ in Ore and Water Based on Strong Lewis Acid–Base Coordination

“…In recent years, simple and rapid testing strategies such as fluorescence, colorimetry, and potentiometry have gained favor but still suffered from poor selectivity and long response time. Fluorescence technology is known for its high sensitivity and low background, and the fluorescence approach offers many possibilities for developing portable sensors combined with 3D printing technology. − Additionally, portable smartphone-based fluorescence sensing platforms offer multiple advantages for real-time monitoring of environmental samples and can be combined with machine learning to reduce labor costs. − Calcein (CL), a remarkable coordination reagent and indicator that belongs to the family of amino poly­(carboxylic acid) ligands of fluorescein, was widely designed as sensing protocols for anions, cations, , molecules, , and biomarkers . However, the quenching fluorescence of CL at acidic pH and poor selectivity limit its broad applications in various fields.…”