研究目的
To create and study one-dimensional coordination copolymers for heterostructure observation and photoluminescence intensification, addressing the lack of artificial systems that can be exfoliated into single wires with copolymer structures.
研究成果
The synthesis of 1D coordination random copolymers enables exfoliation into single strands, visualization of heterostructure via AFM, and significant PL enhancement due to intrawire exciton migration. This work contributes new strategies in polymer and nanoscience, demonstrating potential as photofunctional nanomaterials.
研究不足
Deviation in wire length, elucidation of strand height distribution, and possibility of reaggregation after exfoliation. The study is conducted under ambient conditions and may have limitations in scalability and application in different environments.
1：Experimental Design and Method Selection:
Synthesis of coordination copolymers by mixing bridging dipyrrin proligands with zinc acetate in dichloromethane/methanol, followed by exfoliation via sonication. Use of AFM for structural visualization and UV/vis/PL spectroscopy for photophysical characterization. Numerical simulation based on a restricted random walk model to explain PL enhancement.
2：Sample Selection and Data Sources:
Samples include homopolymers Homo-1, Homo-2, Homo-3 and copolymers Co-1-k, Co-2-k with varying molar ratios. Data from XPS, UV/vis, PL, AFM, and elemental analysis.
3：List of Experimental Equipment and Materials:
Sonication equipment (360 W, 38 kHz), AFM (Agilent Technologies 5500), UV/vis spectrometer (JASCO V-570), fluorescence spectrometer (Hitachi F-4500), quantum yield measurement instrument (Hamamatsu Photonics C9920-02G), NMR spectrometer (Bruker US500), mass spectrometers (JEOL JMS-700 MStation, Waters LCT Premier XE), GPC system (LC-918 with JAIGEL columns), XPS, ICP-AES (Shimadzu ICPS-7510), and substrates like HOPG and SnO
4：Experimental Procedures and Operational Workflow:
Synthesis involves mixing proligands with zinc acetate, storing for days, filtering, and washing. Exfoliation by sonication in toluene. AFM analysis by dropcasting dispersions on substrates. Spectroscopic measurements on dispersions. Photovoltaic conversion using modified SnO2 electrodes.
5：Data Analysis Methods:
UV/vis spectra used to determine mole fractions. AFM height data analyzed with Gaussian fitting. PL quantum yields and lifetimes measured. Numerical simulation for PL properties with 100,000 iterations.
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scanning probe microscope
5500
Agilent Technologies
Atomic force microscopy for visualizing single strands and height distributions.
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UV/vis spectrometer
V-570
JASCO
Recording UV/vis absorption spectra of dispersions.
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fluorescence spectrometer
F-4500
Hitachi
Collecting fluorescence spectra.
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quantum yield measurement instrument
C9920-02G
Hamamatsu Photonics
Measuring absolute photoluminescent quantum yields.
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NMR spectrometer
US500
Bruker
Collecting 1H and 13C nuclear magnetic resonance data.
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mass spectrometer
JMS-700 MStation
JEOL
High-resolution fast-atom bombardment mass spectroscopy.
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ICP-AES equipment
ICPS-7510
Shimadzu
Inductively coupled plasma atomic emission spectrometry for elemental analysis.
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Xe lamp
MAX-302
Asahi Spectra
Providing monochromatic light for photocurrent measurements.
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monochromator
CT-10
JASCO
Monochromating light for action spectrum acquisition.
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mass spectrometer
LCT Premier XE
Waters
High-resolution electrospray ionization time-of-flight mass spectroscopy.
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GPC system
LC-918
Japan Analytical Industry
Preparative gel permeation chromatography for purification.
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electrochemical analyzer
ALS-750A
BAS
Controlling electrode potential and collecting photocurrent.
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