期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 1, 页码 704-712出版社
AMER CHEMICAL SOC
DOI: 10.1021/am5070188
关键词
pH sensors; fluorescence; ratiometric; tautomerism; multicolor luminescence; self-assembly
资金
- National Nuclear RD Program [2011-0031931]
- Global Frontier R&D program on Center for Multiscale Energy System
- National Research Foundation under the Ministry of Science, ICT Future, Korea
We developed a new ratiometric pH sensor based on poly(N-phenylmaleimide) (PPMI)-containing block copolymer that emits three different fluorescent colors depending on the pH. The strong solvatochromism and tautomerism of the PPMI derivatives enabled precise pH sensing for almost the entire range of the pH scale. Theoretical calculations have predicted largely dissimilar band gaps for the keto, enol, and enolate tautomers of PPMI owing to low-dimensional conjugation effects. The tunable emission wavelength and intensity of our sensors, as well as the reversible color switching with high-luminescent contrast, were achieved using rational molecular design of PPMI analogues as an innovative platform for accurate H+ detection. The self-assembly of block copolymers on the nanometer length scale was particularly highlighted as a novel prospective means of regulating fluorescence properties while avoiding the self-quenching phenomenon, and this system can be used as a fast responsive pH sensor in versatile device forms.
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