研究目的
Reducing the aggregation caused quenching (ACQ) effect in π-conjugated luminescent materials to enhance their solid-state photoluminescence quantum yields and enable applications in optoelectronic devices and biological imaging.
研究成果
The co-assembly of PAH chromophores with OFN as a molecular barrier significantly reduces ACQ effect, enhances PLQYs by up to 582%, and improves water dispersibility and biocompatibility, enabling effective cell imaging. This provides a simple, low-cost strategy to transform non-fluorescent PAHs into highly emissive materials for optoelectronic and biological applications.
研究不足
The method may not be universally applicable to all PAHs; scalability and long-term stability in various environments need further investigation; potential cytotoxicity at higher concentrations; reliance on specific surfactants like P123.
1：Experimental Design and Method Selection:
A facile co-assembly method was used to mix PAH chromophores (e.g., perylene, coronene) with octafluoronaphthalene (OFN) as a molecular barrier, and P123 surfactant to control morphology and dispersibility.
2：Sample Selection and Data Sources:
PAHs (perylene, coronene, anthracene, pyrene) and OFN were purchased from Sigma-Aldrich; P123 from Polymer Source Inc.
3：List of Experimental Equipment and Materials:
FTIR spectrometer (Perkin Elmer), Raman spectrometer (Nicolet iS50), PXRD (Bruker D8), single-crystal XRD (Bruker SMART APEX-II), PLQY system (QE-2100), time-resolved fluorometer (Fluoromax-4), DSC (TA Instruments Q10), UV-vis spectrophotometer (Cary 5000), fluorescence spectrophotometer (Cary Eclipse), SEM (JEOL/JSM-6340F), AFM (Asylum Research Cypher S), TEM (JEM-2100), ultrasonic cleaner (DKSONIC DK-1000D), confocal microscope (Leica TSC SPS-II).
4：Experimental Procedures and Operational Workflow:
Micrococrystals were prepared by adding PAH/OFN THF solution to P123 aqueous solution, standing for 12h, and filtering. Nanococrystals were prepared with lower concentrations and sonication. Characterization included FTIR, Raman, PXRD, PLQY, time-resolved PL, DSC, UV-vis, fluorescence spectra, SEM, AFM, TEM. Cell imaging used MCF-7 cells incubated with nanocrystals and imaged with confocal microscope.
5：Data Analysis Methods:
PLQY measured with integrating sphere; time-resolved PL analyzed for lifetimes; cytotoxicity assessed with MTT assay; data processed with software like Material Studio for morphology simulation.
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FTIR Spectrometer
Spectrum Frontier
Perkin Elmer
Used for Fourier transform infrared spectroscopy to analyze chemical bonds and interactions in the cocrystals.
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Raman Spectrometer
Nicolet iS50
Thermo Fisher Scientific
Used for Raman spectroscopy to study molecular vibrations and confirm doping of OFN in cocrystals.
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PXRD Diffractometer
Bruker D8
Bruker
Used for powder X-ray diffraction to analyze crystal structures and confirm cocrystal formation.
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Single-crystal XRD
Bruker SMART APEX-II
Bruker
Used for single-crystal X-ray diffraction to determine detailed molecular stacking in cocrystals.
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UV-vis Spectrophotometer
Cary 5000
Agilent
Used for ultraviolet-visible absorption spectroscopy to analyze optical properties.
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Fluorescence Spectrophotometer
Cary Eclipse
Agilent
Used to collect fluorescence spectra of the samples.
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SEM
JEOL/JSM-6340F
JEOL
Used for scanning electron microscopy to visualize morphologies of micro/nanocrystals.
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AFM
Asylum Research Cypher S
Oxford Instruments
Used for atomic force microscopy to measure thickness and morphology at nanoscale.
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TEM
JEM-2100
JEOL
Used for transmission electron microscopy to image nanoscale structures.
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Confocal Microscope
TSC SPS-II
Leica
Used for confocal fluorescence microscopy in cell imaging studies.
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PLQY Measurement System
QE-2100
Otsuka Electronics
Used to measure photoluminescence quantum yields of the cocrystals.
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Time-resolved Fluorometer
Fluoromax-4
Horiba
Used for time-resolved photoluminescence measurements to study decay lifetimes.
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DSC Instrument
TA Instruments Q10
TA Instruments
Used for differential scanning calorimetry to study thermal properties and melting points.
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Ultrasonic Cleaner
DK-1000D
DKSONIC
Used for sonication during preparation of nanococrystals.
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