Journal
LANGMUIR
Volume 33, Issue 19, Pages 4840-4846Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.langmuir.7b00955
Keywords
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Funding
- National Basic Research Program of China [2013CB834505]
- National Natural Science Foundation of China [U1430128]
- FWO Flanders
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Hollow sphere colloidal photonic crystals (HSCPCs) exhibit the ability to maintain a high refractive index contrast after infiltration of water, leading to extremely high-quality photonic band gap effects, even in an aqueous (physiological) environment. Superhydrophilic pinning centers in a superhydrophobic environment can be used to strongly confine and concentrate water-soluble analytes. We report a strategy to realize real-time ultrasensitive fluorescence detection in patterned HSCPCs based on strongly enhanced fluorescence due to the photonic band-edge effect combined with wettability differentiation in the superhydrophobic/superhydrophilic pattern. The orthogonal nature of the two strategies allows for a multiplicative effect, resulting in an increase of two orders of magnitude in fluorescence.
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