Highly Hg²⁺-sensitive and selective fluorescent sensors in aqueous solution and sensors-encapsulated polymeric membrane

Abstract

The sensors in solutions and sensors encapsulated polymeric membranes exhibited high sensitivity and selectivity for Hg2+ detection, with detection limits of 0.2–49 ppb.

Reduced Graphene Oxide–Thioguanine Composites for the Selective Detection of Inorganic and Organic Mercury in Aqueous Media

“…Although several of them are sensitive methods, they suffer from shortcomings such as multistep synthesis, use of toxic organic solvents during fluorimetric studies, low specificity in detection, and so forth. Surprisingly, however, the majority of them could detect only inorganic mer- cury, [20][21][22][23][24][25][26][27][31][32][33]35,36 and a limited number of existing protocols can selectively recognize organic mercury. [28][29][30]34 Recently, graphene-based materials such as graphene oxide (GO) and reduced GO (rGO), a single atomic layer of sp 2 hybridized carbon atoms arranged in a honeycomb lattice, have received enormous recent attention because of their unique properties such as large surface area, superior mechanical properties, exceptional electronic and optical properties, and thermal stability.…”

A rhodamine‐triazole fluorescent chemodosimeter for Cu2+ detection and its application in bioimaging

“…However, due to the paramagnetic property of Cu 2+ , its chelation to a chemosensor could lead to fluorescence quenching . For Czarnik's rhodamine hydrazide, Cu 2+ promotes a hydrolytic reaction and results in an enhanced fluorescence emission but the chemical probe was later reported to react with Hg 2+ preferentially . Other Cu 2+ ‐selective rhodamine hydrazide derivatives have also been reported as well as rhodamine hydrazide conjugated with different receptors including isothiocyanate, 4‐(dimethylamino)benzaldehyde, sulfonyl, acyl, phenyl, pyridine, semicarbazide, thiosemicarbazide, vanillic aldehyde, 4‐chloro‐7‐nitro‐2,1,3‐benzoxadiazole, 4‐(diphenylamino)benzaldehyde, 1,4‐(5′‐ethynylsalicyaldehyde)‐ N ‐butyl‐1,8‐naphthalimides and the o ‐pyridylaldehyde group have been synthesized to explore the binding affinity for Cu 2+ .…”

“…[22,23] For Czarnik's rhodamine hydrazide, [24] Cu 2+ promotes a hydrolytic reaction and results in an enhanced fluorescence emission but the chemical probe was later reported to react with Hg 2+ preferentially. [25] Other Cu 2+selective rhodamine hydrazide derivatives have also been reported [26][27][28] as well as rhodamine hydrazide conjugated with different receptors including isothiocyanate, [29] 4-(dimethylamino) *In remembrance of His Majesty King Bhumibol Adulyadej .…”

Aggregation-Induced Emission-Based Chemodosimeter Approach for Selective Sensing and Imaging of Hg(II) and Methylmercury Species

“…The major limitations of these methods are requirement of costly and complicated instruments, longer data acquisition time, involvement of trained personnel, etc. In recent years, to overcome these constraints as well as for easy and quick screening of a good number of mercury specifics, various sensor-based approaches have been developed by utilizing polymeric materials, nucleic acids, metal nanoparticles, surface-enhanced Raman scattering (SERS) platforms, , and fluorescent organic molecules. − Among them, fluorimetric chemosensors based on conventional dye molecules have drawn enormous attention because of simplicity and high selectivity with only the limitation of aggregation-caused quenching effect (ACQ) which mostly limits their use in vivo. , Surprisingly, most of them could recognize only inorganic mercury, ,,, and those which can detect organic mercury − are much less in number.…”