Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 6, Issue 7, Pages 4650-4657Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am501106x
Keywords
photoluminescent hydrogel nanoparticles; reversible and linear thermoresponses; temperature-dependent photoluminescence; TPE derivatives; CrO42- sensing
Funding
- National Nature Science Foundation of China [21174048, 21304090, 51373061]
- National Basic Research Program [2012CB933802]
- Programme of Introducing Talents of Discipline to Universities [B06009]
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We report, for the first time, the design and synthesis of thermoresponsive (TR) photoluminescent (PL) hydrogel nanoparticles, with a core consisting of poly[styreneco-(N-isopropylacrylamide)] (PS-co-PNIPAM) and a PNI-PAM-co-PAA shell. PAA represents polyacrylic acid which interacts with our emitting molecule 1,2-bis[4-(2-triethylammonioethoxy)phenyl]-1,2-diphenylethene dibromide (d-TPE). The electrostatic interaction between each water-soluble d-TPE molecule and two AA repeat units activates these d-TPE molecules to exhibit strong PL. Our d-TPE doped PS-co-PNIPAM/PNIPAM-co-PAA particles in water display remarkable TR PL: the emission intensity decreased in the course of heating from 2 to 80 degrees C and recovered during cooling from 80 to 2 degrees C. Such linear, reversible, and sensitive TR PL is achieved by the use of both PAA and PNIPAM as the shell polymeric chain and by careful optimization of the d-TPE to AA feed molar ratio. Thus, the emission of the d-TPE molecule is affected sensitively by temperature. In addition to such an exceptionally temperature-dependent PL, the presence of CrO42- resulted in the decrease of the emission intensity, which was also temperature-dependent. The present study provides a unified conceptual methodology to engineer functional water-dispersible hydrogel nanoparticles that are stimuli-responsive with the potential to advance various PL-based applications.
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