Multiplexing fluorescent sensors for highly acidic range pH, Fe3+ ion, and temperature based on amphiphilic block copolymer

An amphiphilic block copolymer, poly(N-isopropyl acrylamide)- b -poly(N-vinyl carbazole) containing 1,8-naphthalimide and spirolactam rhodamine 6G moieties, has been designed as fluorescent sensors for detecting pH, Fe 3+ ion, and temperature. The emission from the poly(N-vinyl carbazole) block almo...

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Bibliographic Details
Published in:Colloid and polymer science 2023, Vol.301 (1), p.41-49
Main Authors: Kong, Fan, Nie, Wenhui, Lin, Mengqi
Format: Article
Language:English
Subjects:
Acrylamide
Aqueous solutions
Biosensors
Block copolymers
Carbazoles
Characterization and Evaluation of Materials
Chemical compounds
Chemistry
Chemistry and Materials Science
Complex Fluids and Microfluidics
Copolymers
Energy transfer
Ferric ions
Fluorescence
Food Science
Multiplexing
Nanotechnology and Microengineering
Original Contribution
Physical Chemistry
Polymer Sciences
Polymers
Polyvinyl carbazole
Rhodamine 6G
Sensors
Soft and Granular Matter
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Summary:An amphiphilic block copolymer, poly(N-isopropyl acrylamide)- b -poly(N-vinyl carbazole) containing 1,8-naphthalimide and spirolactam rhodamine 6G moieties, has been designed as fluorescent sensors for detecting pH, Fe 3+ ion, and temperature. The emission from the poly(N-vinyl carbazole) block almost disappears, and the enhanced emissions from the 1,8-naphthalimide (505 nm) and rhodamine 6G (555 nm) moieties are observed due to the effective resonance energy transfer among the fluorophores. The plots of I 555 / I 505 functional of pH value of the Britton-Robinson buffer, Fe 3+ concentration, and temperature show that there are good linear relationships in particular ranges. The results indicate that the block copolymer can be used as multiplexing ratiometric fluorescent sensors and realized at different excitation wavelengths. The functional relationship of the I 555 / I 505 value and the concentration of the detection medium has been established according to Förster theory, which is consistent with the experimental results.
ISSN:0303-402X
1435-1536
DOI:10.1007/s00396-022-05040-7