研究目的
Investigating the handedness determination of single chiral lanthanide based luminescent nanocrystals to understand symmetry breaking mechanisms in chiral materials.
研究成果
The study successfully demonstrated a methodology for handedness sorting of single nanostructures based on CPL, applicable to rod-shaped Eu3+ doped TbPO4·D2O nanocrystals. This technique could be extended to single chiral molecules or molecular aggregates with sufficient emission dissymmetry, offering a valuable tool for studying symmetry breaking mechanisms and their kinetics.
研究不足
The technique's applicability is limited by the need for nanocrystals with large emission dissymmetry. The method may not be directly applicable to single chiral molecules or molecular aggregates without significant emission dissymmetry.
1：Experimental Design and Method Selection:
The study involved the synthesis of rod-shaped Eu3+ doped (5%) TbPO4·D2O lanthanide nanocrystals, directed with either D- or L- tartaric acid. The nanocrystals' handedness was determined using circularly polarized luminescence (CPL) microscopy and a machine learning algorithm for classification.
2：Sample Selection and Data Sources:
Nanocrystals were synthesized and dispersed in D2O, drop-cast on a Formvar film coated copper grid for TEM and luminescence microscopy.
3：List of Experimental Equipment and Materials:
Supercontinuum laser, acousto-optic tunable filter, spectrograph equipped with an EM-CCD camera, TEM, and various optical components for CPL measurements.
4：Experimental Procedures and Operational Workflow:
The nanocrystals were excited at 488 nm, and their luminescence was collected and analyzed for circular polarization. A machine learning algorithm was trained on spectral features to classify the nanocrystals' handedness.
5：Data Analysis Methods:
The emission spectra were analyzed for circular polarization dissymmetry, and a Support Vector Machine (SVM) classifier was used for handedness determination based on spectral features.
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