研究目的
Investigating the effect of solvents on the re-precipitation of CsPbBr3 perovskite nanocrystals at room temperature, focusing on size and shape control, and their optoelectronic properties.
研究成果
The study successfully demonstrated a simple method to tune the size and shape of CsPbBr3 perovskite nanocrystals using various anti-solvents, leading to band-gap engineering and potential applications in optoelectronics. The method provides flexibility for future applications in LEDs, lasing, and photodetectors.
研究不足
The study is limited by the use of specific solvents and conditions, and the potential environmental and health hazards of some solvents used. The mechanism of shape and size control is not fully understood and requires further investigation.
1：Experimental Design and Method Selection:
The study involved the synthesis of CsPbBr3 nanocrystals via a hot-injection method followed by re-dispersion in various anti-solvents at ambient conditions to study the effect on size and shape.
2：Sample Selection and Data Sources:
CsPbBr3 nanocrystals were synthesized using cesium carbonate, lead bromide, oleic acid, and oleylamine in 1-octadecene.
3：List of Experimental Equipment and Materials:
Instruments included FE-SEM, HR-TEM, XPS, XRD, spectrophotometer, spectrofluorometer, and TCSPC setup. Materials included cesium carbonate, lead bromide, oleic acid, oleylamine, and various solvents.
4：Experimental Procedures and Operational Workflow:
CsPbBr3 nanocrystals were synthesized, separated, and then re-dispersed in different anti-solvents to observe changes in morphology and optical properties.
5：Data Analysis Methods:
Data were analyzed using XRD for crystal structure, FE-SEM and HR-TEM for morphology, and spectrophotometry and spectrofluorometry for optical properties.
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Field Emission Scanning Electron Microscope
Zeiss UltraTM 55
Zeiss
Morphology and EDX analysis of microcubes, large size nanocubes, and self-assembly of nanocubes.
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High Resolution Transmission Electron Microscopy
FEI HR-TEM TALOS F200X
FEI
Imaging of nanocubes, self-assembly of nanocubes, and shape-controlled nanorods.
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X-ray Photoelectron Spectroscopy
BRUKER
BRUKER
Elemental characterization of perovskite composition.
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X-ray Diffraction
PANalytical Empyrean
PANalytical
Thin-film X-ray diffraction analysis.
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Spectrophotometer
Shimadzu UV-1800
Shimadzu
Absorption spectra recording.
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Dynamic Light Scattering
Anton Paar LitesizerTM500
Anton Paar
Particle size analysis.
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Spectrofluorometer
Fluorolog-3
Spex, JobinYvon
Photoluminescence spectra recording.
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Time-Correlated Single Photon Counting
Fluorolog-3 Triple Illuminator, IBH Horiba JobinYvon
IBH Horiba JobinYvon
Fluorescence lifetime measurements.
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