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A Stimuli‐Responsive Nanogel‐Based Sensitive and Selective Fluorescent Sensor for Cr 3+ with Thermo‐Induced Tunable Detection Sensitivity
Author(s) -
Wan Xuejuan,
Liu Haiyang,
Yao Shen,
Liu Tianqi,
Yao Youwei
Publication year - 2014
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.201300810
Subject(s) - nanogel , fluorescence , aqueous solution , rhodamine b , materials science , rhodamine , covalent bond , chemistry , photochemistry , biophysics , nanotechnology , organic chemistry , drug delivery , physics , quantum mechanics , photocatalysis , biology , catalysis
Stimuli‐responsive poly( N ‐isopropylacrylamide) nanogel with covalently labeled rhodamine B urea derivatives (P(NIPAM‐ co ‐RhBUA)) is utilized as a sensitive fluorescent probe for Cr 3+ in aqueous solution, and its thermo‐induced tunable detection capacity is investigated. At 20 °C, non‐fluorescent nanogel can selectively bind with Cr 3+ over some other metal ions, leading to prominent fluorescence OFF–ON switching due to the recognition of RhBUA with Cr 3+ . Upon heating above the phase transition temperature, enhanced fluorescence intensity is observed (≈61‐fold increase at 45 °C) for the nanogel in the presence of Cr 3+ , accompanied with an improved detection sensitivity, which suggest that hydrophobic microenvironment generated in the collapsed nanogel plays an active role for their detection performance.