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• W2888045561 startingPage "30662" @default.
• W2888045561 abstract "The combination of functional nucleic acids and nanomaterials enables the continuous development of hybrid nanosystems that have found wide applications including chemo/biosensing. Herein, we report the supramolecular assembly of a “sesame biscuit”-like superstructural nanosystem based on aptamer, quantum dot (QD), and graphene oxide (GO), and its diverse applications in Pb2+ and pH sensing. The nanosystem was assembled via adsorbing silica-encapsulated green-emitting QD onto the edge of GO by ionic interaction, followed by absorbing aptamer-modified red-emitting QD onto the GO surface via the π-stacking interaction. The nanosystem showed the characteristic of the nonquenched green fluorescence due to silica encapsulation and quenched red fluorescence owing to nanomaterial surface energy transfer. The nanosystem responded to Pb2+/pH in ratiometric fluorescence: the red fluorescence varied upon analyte-driven conformational changes of the aptamer, whereas the green one remained constant. Under optimized conditions, the nanosystem was demonstrated to be capable of quantifying Pb2+ with a detection limit of 11.7 pM, as well as pH with a sensing resolution of 0.1 pH unit. More importantly, the ratiometric nanosystem facilitated visualization of analytes in a distinct “traffic light” manner, which was exemplified by semiquantification of exogenous Pb2+ in living cells. To demonstrate practicality, fluorescent test strips were fabricated by immobilizing the nanosystem on paper. The fluorescent test strips displayed traffic light-type fluorescence color changes, with the capacity for on-site, naked-eye detection of Pb2+ in real samples, as well as point-of-care pH testing in routine urinalysis." @default.
• W2888045561 created "2018-08-31" @default.
• W2888045561 creator A5018427167 @default.
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• W2888045561 date "2018-08-23" @default.
• W2888045561 modified "2023-10-17" @default.
• W2888045561 title "Supramolecularly Assembled Ratiometric Fluorescent Sensory Nanosystem for “Traffic Light”-Type Lead Ion or pH Sensing" @default.
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• W2888045561 doi "https://doi.org/10.1021/acsami.8b10007" @default.
• W2888045561 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30136835" @default.
• W2888045561 hasPublicationYear "2018" @default.
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