Impact of Thermal Annealing on Facet-Directed Epitaxial and Decorated Nonepitaxial Pd-CsPbBr<sub>3</sub> Nanocrystal Heterostructures

Behera, Rakesh Kumar; Pradhan, Narayan

doi:10.1021/acs.chemmater.3c02563

Cited by 6 publications

(7 citation statements)

References 56 publications

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“…In addition, the powder XRD patterns and the XPS spectra of these heterostructures are presented in Figure a,b, respectively. In most of the epitaxial CsPbBr 3 perovskite nanocrystal heterostructures, XRD peaks are mostly dominated with CsPbBr 3 perovskite ,,,, and hence, obtaining intense and clear XRD peaks for the metal sulfides part remained indeed difficult. Again, for these heterostructures, the XPS spectra (Figure b) further confirm the presence of Bi(III) and S(II) in the PbBi 2 S 4 rod nanocrystal.…”

Section: Resultsmentioning

confidence: 99%

Perovskite-Chalcogenide Epitaxial Heterostructures: Possibility of Multiple Axial Orientations of CsPbBr₃ Nanocrystals on PbBi₂S₄ Nanorods

Patra,

Jagadish,

Shyamal

et al. 2024

Chem. Mater.

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The chemistry of designing epitaxial perovskite-chalcogenide nanocrystal heterostructures still could not be established yet in spite of significant successes in understanding both perovskite and chalcogenide nanostructures formation. Interfacing the ionic–covalent bonding at the junction of both remains the major obstacle for establishing the seamless formation of such nanostructures. Keeping the compatibility of Bi(III) ions with Pb(II) in different lead halide perovskite nanocrystals, herein, multiple possibilities of interface junctions of ionic CsPbBr3 and covalent PbBi2S4 sulfide nanocrystals are reported. Creating the common Pb(II) sublattice structures in this system indeed helped in designing such a wide possibility of nanocrystal heterostructures, and this supported the connection of CsPbBr3 polyhedral nanocrystals with PbBi2S4 nanorods in different orientations. While epitaxial heterostructure formations are typically observed with the interface of specific facets of two nanoscale materials, here, for perovskites, this provides multiple options of different facets combination. This concept remained important for fundamental understanding in creating junctions of ionic–covalent crystals and also helped in establishing the method for designing halide perovskite-chalcogenide nanocrystal heterostructures. Such interface junctions, where defects are mostly generated due to halide deficiency, quench the optical emission, but, in contrary, enhance the catalytic activities.

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Section: Resultsmentioning

confidence: 99%

Perovskite-Chalcogenide Epitaxial Heterostructures: Possibility of Multiple Axial Orientations of CsPbBr₃ Nanocrystals on PbBi₂S₄ Nanorods

Patra,

Jagadish,

Shyamal

et al. 2024

Chem. Mater.

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“…Hence, more sophisticated experiments, as well as theoretical calculations, may be required to establish the same. However, larger size Pt and Pd particles epitaxially connected to CsPbBr 3 are already reported. , Hence, before concluding the feasibility of formation of such structures and their interfacial chemical interactions, more details of the epitaxial structures of Pd and Pt connected CsPbBr 3 are discussed.…”

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confidence: 97%

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confidence: 99%

“…Further, all of the reported epitaxial heterostructures suggest that the bright emission of halide perovskite nanocrystals largely quenched once these are connected with metal(0). For the case of Pt-, Pd- and Bi-, this has been observed for CsPbBr 3 . − However, a report on Ag(0) showed the retention of the host emission . For the case of Au, as no such report has been established yet having plasmonic Au epitaxially connected to halide perovskite nanocrystals, the change in the optical properties is still unclear.…”

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“…On the other hand, for the rhombic dodecahedron shape the epitaxial orientation also differed, and from the results, it is established that d (011) of CsPbBr 3 resembled 3 × d (11) of Pt and the atomic models of such junction is presented in Figure c Figure d presents the epitaxial orientations of CsPbBr 3 with Pd, and here the [100] direction of cubic Pd lattice is oriented along [110] of CsPbBr 3 . Representative High Resolution TEM (HRTEM) and High Resolution Scanning TEM (HRSTEM) images of Pt-CsPbBr 3 are presented in Figure e and Figure f, respectively.…”

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Design Strategies for Epitaxial Metal(0)–Halide Perovskite Nanocrystal Heterostructures

Pradhan

2024

ACS Energy Lett.

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Halide Perovskite Nanocrystals for Shaping Pt Nanostructures

Das,

Patra,

Dutta

et al. 2024

Chem. Mater.

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Halide contents in the reaction system during the formation of lead halide perovskite nanocrystals remained a critical parameter for controlling their surface facets and optical properties. In addition, herein, the impact of halide ions has also been explored as a deciding factor for the formation of metal(0)-perovskite nanocrystal heterostructures. Using CsPbBr 3 and Pt, it is observed that minimum bromide concentration is ideal for epitaxial connection of Pt particles, but with a greater amount, these are disconnected during annealing. In addition, CsPbBr 3 perovskite nanocrystals also acted here as the catalyst for nucleating and shaping Pt particles, which on altering reaction parameters tuned their shape from small dots to cubes and also in rod shape. The control of obtaining one-to-one or one-to-many types of heterostructures, as well as excess Pt particles retained in bulk solution, are also established. Formation of all these shapes is further observed related to the host nanocrystals, as without CsPbBr 3 no such structures of Pt are seen in control reactions. This catalytic nucleation and formation of Pt particles on the surface of CsPbBr 3 and their retention or ejection from the surface of CsPbBr 3 are correlated with the halide contents and the extent of epitaxial growth between these two materials. Hence, rather than using the traditional approach, herein, CsBr to CsPbBr 3 transformation protocol is used for the formation of required excess halides in the reaction system, and phenacyl bromide is used for bringing and tuning shapes of the perovskite nanocrystals. Details of all these studies are investigated and the shaping of Pt particles are correlated to the facets, sizes, and shapes of CsPbBr 3 perovskite nanocrystals.

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Impact of Thermal Annealing on Facet-Directed Epitaxial and Decorated Nonepitaxial Pd-CsPbBr₃ Nanocrystal Heterostructures

Cited by 6 publications

References 56 publications

Perovskite-Chalcogenide Epitaxial Heterostructures: Possibility of Multiple Axial Orientations of CsPbBr₃ Nanocrystals on PbBi₂S₄ Nanorods

Perovskite-Chalcogenide Epitaxial Heterostructures: Possibility of Multiple Axial Orientations of CsPbBr₃ Nanocrystals on PbBi₂S₄ Nanorods

Design Strategies for Epitaxial Metal(0)–Halide Perovskite Nanocrystal Heterostructures

Halide Perovskite Nanocrystals for Shaping Pt Nanostructures

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Impact of Thermal Annealing on Facet-Directed Epitaxial and Decorated Nonepitaxial Pd-CsPbBr3 Nanocrystal Heterostructures

Cited by 6 publications

References 56 publications

Perovskite-Chalcogenide Epitaxial Heterostructures: Possibility of Multiple Axial Orientations of CsPbBr3 Nanocrystals on PbBi2S4 Nanorods

Perovskite-Chalcogenide Epitaxial Heterostructures: Possibility of Multiple Axial Orientations of CsPbBr3 Nanocrystals on PbBi2S4 Nanorods

Design Strategies for Epitaxial Metal(0)–Halide Perovskite Nanocrystal Heterostructures

Halide Perovskite Nanocrystals for Shaping Pt Nanostructures

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Product

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Impact of Thermal Annealing on Facet-Directed Epitaxial and Decorated Nonepitaxial Pd-CsPbBr₃ Nanocrystal Heterostructures

Perovskite-Chalcogenide Epitaxial Heterostructures: Possibility of Multiple Axial Orientations of CsPbBr₃ Nanocrystals on PbBi₂S₄ Nanorods

Perovskite-Chalcogenide Epitaxial Heterostructures: Possibility of Multiple Axial Orientations of CsPbBr₃ Nanocrystals on PbBi₂S₄ Nanorods