Simultaneous monitoring of the fluorescence and refractive index by surface plasmon coupled emission: A proof-of-concept study

Simultaneous acquisition of fluorescence property and refractive index using a single surface plasmon coupled emission(SPCE)measurement has been achieved,thus achieving synchronicity in real time.The SPCE sensor was employed for monitoring the adsorption of volatile organic compounds(VOCs)by dyeencapsulated metal-organic frameworks(Dye@MOFs).Refractive index can reveal surface molecular adsorption and the fluorescence with information on refractive index can provide a comprehensive analysis of the adsorption events of VOCs on the interface.Meantime,the signal intensity can be amplified by combining the responses caused by changes in refractive index and the fluorescence property in parallel.This all-in-one method opens up a route to monitoring multiple processes simultaneously occurring on the interface.

High sensitivity ratiometric fluorescence temperature sensing using the microencapsulation of CsPbBr3 and K2SiF6:Mn4+phosphor

A dual emission sensing film has been prepared for colorimetric temperature sensing using CsPbBr_(3)perovskite nanocrystals(CsPbBr_(3)NCs)and manganese doped potassium fluorosilicate(K_(2)SiF_(6):Mn^(4+),KSF)encapsulated in polystyrene by a microencapsulation strategy.The CsPbBr_(3)-KSF-PS film shows good temperature sensing response from 30℃to 70℃,with a relative temperature sensitivity(Sr)up to 10.31%℃^(−1) at 45℃.Meanwhile,the film maintains more than 95%intensity after 6 heating-cooling cycles and keeps its fluorescence characteristics after 3 months.The film can be used to monitor temperature change by naked eye under a UV lamp.In particular,the temperature discoloration point of the sensing film can be controlled by the ratio change of CsPbBr_(3):KSF to expand its applications.The study of the CsPbBr_(3)-KSF-PS sensing mechanism in this work is helpful to provide effective strategies for the design of reliable,high sensitivity and stable temperature sensing system using CsPbBr_(3)NCs.

The synthesis of B,N-carbon dots by a combustion method and the application of fluorescence detection for Cu^2+

Heteroatom doping is an efficient approach to regulate the fluorescence properties of carbon dots.Using aminophenylboronic acid as the raw material,a combustion method was developed for the synthesis of boron,nitrogen-doped carbon dots（B,N-carbon dots）.The B,N-carbon dots emitted green fluorescence and displayed high resistance to both photo bleaching and ionic strength.A facile fluorescence sensing approach for Cu^2＋ was fabricated via static fluorescence quenching.Under optimal conditions,a rapid detection of Cu^2＋ could be completed in 2 min with a linearity ranging from 1 μmol/L to 25 μmol/L and a detection limit of 0.3 μmol/L Furthermore,the proposed method showed potential applications for the detection of Cu^2＋ in natural water samples.

Enhanced modulation of magnetic field on surface plasmon coupled emission(SPCE) by magnetic nanoparticles

The obvious enhancement effect of magnetic nanoparticles(MNPs) introduced in Cr/Co/Cr/Au substrate on the pulsed magnetic field-modulated surface plasmon coupled emission(SPCE) was investigated,and the observed enhancement factor was 4 comparing with the magnetic field modulated SPCE without MNPs.This is the new observation for the magnetic field modulated SPCE,and this method was designed as a biosensor,which to our knowledge,is the first application of magnetic field-modulated SPCE in biosensing and detection field.This strategy is a universal approach to increase the fluorescence signal and helps to build the new SPCE based stimulus-response system.

Rapidly SO2-responsive vesicles with intrinsic fluorescent indicators for membrane structure evolution

Stimuli-responsive vesicles(SRVs)have been widely exploited as smart nanocarriers for biomedical applications.Herein,high-performance SO2-responsive nanovesicles were reported to exemplify a new mode of SRVs.Structurally,the sensory vesicles were based on amphiphilic hydrogen-bonded(HB)polymers which can be facilely fabricated via modular self-assembly.The HB polymers are designed to consist of a melamine-barbituric acid HB skeleton with pendant anthracene fluorophores and amphiphilic side chains.Upon stimulation with increasing amount of SO2,the vesicles in aqueous solution undergo an unusual morphology evolution including rapid fission into small ones,swelling and final collapse of the offspring vesicles.During this process,the intrinsic fluorescence response of the vesicles allows intuitive tracking of the hierarchical structural evolution of the self-assembled membranes and straightforward quantitation of the stimuli.This work exemplifies a rational design of auto-recording stimuli-responsive nanovesicles.