Role of Acid-Base Equilibria in the Size, Shape, and Phase Control of Cesium Lead Bromide Nanocrystals.
basic_science · Level V
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- Record sourced from PubMed, PMID 29381326.
- Also identified by DOI 10.1021/acsnano.7b08357 and PMC identifier 5830690.
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Abstract
A binary ligand system composed of aliphatic carboxylic acids and primary amines of various chain lengths is commonly employed in diverse synthesis methods for CsPbBr<sub>3</sub> nanocrystals (NCs). In this work, we have carried out a systematic study examining how the concentration of ligands (oleylamine and oleic acid) and the resulting acidity (or basicity) affects the hot-injection synthesis of CsPbBr<sub>3</sub> NCs. We devise a general synthesis scheme for cesium lead bromide NCs which allows control over size, size distribution, shape, and phase (CsPbBr<sub>3</sub> or Cs<sub>4</sub>PbBr<sub>6</sub>) by combining key insights on the acid-base interactions that rule this ligand system. Furthermore, our findings shed light upon the solubility of PbBr<sub>2</sub> in this binary ligand system, and plausible mechanisms are suggested in order to understand the ligand-mediated phase control and structural stability of CsPbBr<sub>3</sub> NCs.