Amino Acid-Driven Dimensional Reduction of CsPbBr3 Nanocrystals
Nikunj Agarwal1, Deepshikha Agarwal1, Tushar Debnath1,2
1Centre for Nanotechnology, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India.
ACS Omega
|July 22, 2024
Summary
Functionalizing cesium lead bromide perovskite nanocrystals with amino acids and gold creates new nanoplatelets with potential for bioimaging applications.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Engineering
Background:
- Biomineralization inspires novel material synthesis.
- Organic molecule incorporation into inorganic lattices yields tunable optical properties.
- Cesium lead bromide perovskite nanocrystals (PNCs) are promising optoelectronic materials.
Purpose of the Study:
- To functionalize CsPbBr3 PNCs with amino acids (AAs) using an interfacial approach.
- To investigate the structural and phase transformations of PNCs upon interaction with AAs and gold.
- To explore the potential of AA-functionalized PNCs for bioimaging.
Main Methods:
- Water-hexane interfacial synthesis of functionalized PNCs.
- Optical spectroscopy to probe interactions and transformations.
- X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and high-resolution transmission electron microscopy (HRTEM) for structural analysis.
Main Results:
- Functionalization with cysteine and AuBr3 induced dimensional reduction of CsPbBr3 PNCs to nanoplatelets (NPls).
- Phase transformation from CsPbBr3 to CsPb2Br5 NPls was observed.
- Mechanistic insights suggest preferential ligand binding drives dimensional growth and CsBr stripping facilitates phase transformation.
Conclusions:
- Amino acid functionalization offers a pathway to tune perovskite nanocrystal morphology and phase.
- The observed transformations are driven by interfacial chemistry and ligand interactions.
- AA-functionalized PNCs show potential as fluorescent probes for bioimaging due to their tunable properties and biological relevance.
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