Dataset Information

Stable and Size Tunable CsPbBr₃ Nanocrystals Synthesized with Oleylphosphonic Acid.

ABSTRACT: We employed oleylphosphonic acid (OLPA) for the synthesis of CsPbBr₃ nanocrystals (NCs). Compared to phosphonic acids with linear alkyl chains, OLPA features a higher solubility in apolar solvents, allowing us to work at lower synthesis temperatures (100 °C), which in turn offer a good control over the NCs size. This can be reduced down to 5.0 nm, giving access to the strong quantum confinement regime. OLPA-based NCs form stable colloidal solutions at very low concentrations (∼1 nM), even when exposed to air. Such stability stems from the high solubility of OLPA in apolar solvents, which enables these molecules to reversibly bind/unbind to/from the NCs, preventing the NCs aggregation/precipitation. Small NCs feature efficient, blue-shifted emission and an ultraslow emission kinetics at cryogenic temperature, in striking difference to the fast decay of larger particles, suggesting that size-related exciton structure and/or trapping-detrapping dynamics determine the thermal equilibrium between coexisting radiative processes.

SUBMITTER: Zhang B

PROVIDER: S-EPMC7872419 | biostudies-literature | 2020 Dec

REPOSITORIES: biostudies-literature

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Stable and Size Tunable CsPbBr<sub>3</sub> Nanocrystals Synthesized with Oleylphosphonic Acid.

Zhang Baowei B Goldoni Luca L Lambruschini Chiara C Moni Lisa L Imran Muhammad M Pianetti Andrea A Pinchetti Valerio V Brovelli Sergio S De Trizio Luca L Manna Liberato L

Nano letters 20201117 12

We employed oleylphosphonic acid (OLPA) for the synthesis of CsPbBr<sub>3</sub> nanocrystals (NCs). Compared to phosphonic acids with linear alkyl chains, OLPA features a higher solubility in apolar solvents, allowing us to work at lower synthesis temperatures (100 °C), which in turn offer a good control over the NCs size. This can be reduced down to 5.0 nm, giving access to the strong quantum confinement regime. OLPA-based NCs form stable colloidal solutions at very low concentrations (∼1 nM), ...[more]

PMID: 33201718

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Project description:Recently, CsPbX3 (X= Cl, Br, I) nanocrystals (NCs) have evolved as a potential contender for various optoelectronic applications due to some of their excellent photophysical properties. Their superior non-linear optical properties enable them to take part in bioimaging applications due to their longer penetration depth and less scattering effect in living cells. However, the poor stability of perovskite NCs in aqueous media still remains a great challenge for practical usage. Comparatively stable silica-coated NCs have a tendency to agglomerate among other NCs and transform into bigger particles. Such big particles clog the inside of narrow channels during the uptake and can't effectively reach the targeted cells. To tackle such issues, we introduce a fast and reproducible synthesis process of CsPbBr3 NCs that are coated with different long-chained organic ligands/polymers and compared their photophysical properties. Among them, polyvinylpyrrolidone (PVP) encapsulated NCs are highly luminescent in the green spectral region and showed a maximum photoluminescence quantum yield (PLQY) of up to 84%. The incorporation of n-isopropyl acrylamide (NIPAM) along with PVP further improves the stability of the PVP-coated NCs against heat and moisture. These NCs exhibit higher water stability compared to silica-coated NCs and maintained their emission properties for about one week in DI water. The smaller particle size, uniform size distribution, higher structural stability, and better dispersivity of polymer-coated NCs in the aqueous media enable them to perform as fluorescent probes for live cell imaging in mammalian Chinese Hamster Ovary (CHO-K1) cells. There is no adverse affect in the cells' viability and morphology even after long incubation periods (∼72 hours). The dosage of Pb-ions contained in the polymer-coated NCs is calculated as below 5 μg mL-1, which is suitable for live cell imaging. This work provides insight for expanding the use of these NCs significantly into bioimaging applications with higher sensitivity.

Dataset Information

Stable and Size Tunable CsPbBr₃ Nanocrystals Synthesized with Oleylphosphonic Acid.

Publications

Stable and Size Tunable CsPbBr<sub>3</sub> Nanocrystals Synthesized with Oleylphosphonic Acid.

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Dataset Information

Stable and Size Tunable CsPbBr3 Nanocrystals Synthesized with Oleylphosphonic Acid.

Publications

Stable and Size Tunable CsPbBr<sub>3</sub> Nanocrystals Synthesized with Oleylphosphonic Acid.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

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Stable and Size Tunable CsPbBr₃ Nanocrystals Synthesized with Oleylphosphonic Acid.