title: β-Cyclodextrin and calix[4]arene-25,26,27,28-tetrol capped carbon dots for selective and sensitive detection of fluoride.
abstract: In this work we have designed a novel system based on carbon dots prepared from chitosan gel capped with β-cyclodextrin and calix[4]arene-25,26,27,28-tetrol for sensitive and selective detection of fluoride ions in aqueous media. Fluorescent carbon dots prepared from chitosan gel when capped with β-cyclodextrin and calix[4]arene-25,26,27,28-tetrol results in quenching of its fluorescence intensity. Introduction of F(-) ions to carbon dots capped with β-cyclodextrin and calix[4]arene-25,26,27,28-tetrol system results in enhancement and restoration of fluorescence intensity leading to detection of F(-) ion. Minimum detection limit was determined to be ∼6.6 μM. The detection is selective as with other halide ions i.e. Cl(-), Br(-) and I(-) and hydroxyl ion (OH(-)), there is observed decrease of fluorescence intensity. A possible mechanism to justify the observation is also discussed in the paper.
authors.affiliation: Material Nanochemistry Laboratory, Physical Sciences Division, Institute of Advanced Study in Science and Technology, Paschim Boragaon, Garchuk, Guwahati 781035, India.
authors.forename: Upama
authors.initials: U
authors.lastname: Baruah
authors.affiliation: Material Nanochemistry Laboratory, Physical Sciences Division, Institute of Advanced Study in Science and Technology, Paschim Boragaon, Garchuk, Guwahati 781035, India.
authors.forename: Neelam
authors.initials: N
authors.lastname: Gogoi
authors.affiliation: Department of Chemistry, Assam Engineering College, Jalukbari, Guwahati 781013, India. Electronic address: gitanjalic@gmail.com.
authors.forename: Gitanjali
authors.initials: G
authors.lastname: Majumdar
authors.affiliation: Material Nanochemistry Laboratory, Physical Sciences Division, Institute of Advanced Study in Science and Technology, Paschim Boragaon, Garchuk, Guwahati 781035, India. Electronic address: devasish@iasst.gov.in.
authors.forename: Devasish
authors.initials: D
authors.lastname: Chowdhury
mesh_terms: D047250:Calixarenes / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry; D048271:Chitosan / Q000737:chemistry; D005231:Fatty Acids, Unsaturated / Q000737:chemistry; D005459:Fluorides / Q000737:chemistry*; D005782:Gels / Q000737:chemistry; D057230:Limit of Detection; D010636:Phenols / Q000737:chemistry*; D013050:Spectrometry, Fluorescence / Q000379:methods; D047392:beta-Cyclodextrins / Q000737:chemistry*
chemical_list: D005231:Fatty Acids, Unsaturated; D005782:Gels; D010636:Phenols; D047392:beta-Cyclodextrins; C121325:calix(4)arene; D047250:Calixarenes; C035369:2-butynoic acid; D002244:Carbon; D048271:Chitosan; C031215:betadex; D005459:Fluorides
keywords: Capping; Carbon dots; Chitosan; Fluorescence enhancement; Fluorescence quenching; Sensing