Interfacing a Tetraphenylethene Derivative and a Smart Hydrogel for Temperature-Dependent Photoluminescence with Sensitive Thermoresponse | Zendy

Yingnan Jiang | Zendy; Xudong Yang | Zendy; Cheng Ma | Zendy; Chuanxi Wang | Zendy; Yang Chen | Zendy; Fengxia Dong | Zendy; Bai Yang | Zendy; Kui Yu | Zendy; Quan Lin | Zendy

Open Access

Interfacing a Tetraphenylethene Derivative and a Smart Hydrogel for Temperature-Dependent Photoluminescence with Sensitive Thermoresponse

Author(s) -

Yingnan Jiang,

Xudong Yang,

Cheng Ma,

Chuanxi Wang,

Yang Chen,

Fengxia Dong,

Bai Yang,

Kui Yu,

Quan Lin

Publication year - 2014

Publication title -

acs applied materials and interfaces

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.535

H-Index - 228

eISSN - 1944-8252

pISSN - 1944-8244

DOI - 10.1021/am501106x

Subject(s) - materials science , photoluminescence , polyacrylic acid , molecule , nanoparticle , chemical engineering , lower critical solution temperature , derivative (finance) , polymer chemistry , nanotechnology , polymer , organic chemistry , composite material , copolymer , optoelectronics , chemistry , economics , financial economics , engineering

We report, for the first time, the design and synthesis of thermoresponsive (TR) photoluminescent (PL) hydrogel nanoparticles, with a core consisting of poly[styrene-co-(N-isopropylacrylamide)] (PS-co-PNIPAM) and a PNIPAM-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 °C and recovered during cooling from 80 to 2 °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 CrO4(2-) 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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