Pressure‐Tuned Structure and Property of Optically Active Nanocrystals

Bai, Feng; Li, Binsong; Bian, Kaifu; Haddad, Raid E.; Wu, Huimeng; Wang, Zhongwu; Fan, Hongyou

doi:10.1002/adma.201504819

Cited by 21 publications

(9 citation statements)

References 28 publications

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“…The crystal structures of MPp consist of an interesting coordination polymer exhibiting 2D paddle‐wheel‐like network . Each MPp molecule is coordinated to two neighboring MPp via two opposite pyridyl substituents, and to the other two adjacent MPp through the axial sites of MN 6 octahedra with the distances of M···N py are 2.273 and 2.360 Å (Figure and Table ).…”

Section: Resultsmentioning

confidence: 99%

Pyridinium‐functionalized metalloporphyrins as bifunctional catalysts for cycloaddition of epoxides and carbon dioxide

Sun²,

et al. 2020

Applied Organom Chemis

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New pyridinium‐functionalized metalloporphyrins MEtPpBr4 (M = Zn2+, Co2+, Ni2+, Cu2+; EtPp = 5, 10, 15, 20‐tetra(4‐(3‐(N‐ethyl‐4‐pyridyl)pyrazolyl)phenyl)porphyrin) were synthesized as bifunctional catalysts for the cycloaddition reactions of epoxides and CO2. The effects of catalyst loading, CO2 pressure, reaction temperature and time on catalytic activity were investigated. ZnEtPpBr4 (1) and CoEtPpBr4 (2) exhibited efficient activities in the cycloaddition reactions of various epoxides with CO2 as at 120 °C under 2 MPa of CO2 pressure without solvent. Most of corresponding cyclic carbonates could be obtained in almost quantitative yields and > 99.9% selectivity with molar ratio of epoxide/catalyst 2222 after 8 hr of reaction.

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Section: Resultsmentioning

confidence: 99%

Pyridinium‐functionalized metalloporphyrins as bifunctional catalysts for cycloaddition of epoxides and carbon dioxide

Sun²,

et al. 2020

Applied Organom Chemis

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“…Thus, a balance between van der Waals attraction and electrostatic repulsion leads to assembly with “loose” packing (Figures and S1). Such loose packing allows one to tune properties like the size and lattice constant of assembled structureswhich are parameters relevant to plasmonic coupling applications − simply by adjusting the ionic strength of the surrounding solution. At the same time, these anisometric nanoplates have a micrometer-scale edge length.…”

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confidence: 99%

Polymerization-Like Co-Assembly of Silver Nanoplates and Patchy Spheres

Luo

Smith

et al. 2017

ACS Nano

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Highly anisometric nanoparticles have distinctive mechanical, electrical, and thermal properties and are therefore appealing candidates for use as self-assembly building blocks. Here, we demonstrate that ultra-anisometric nanoplates, which have a nanoscale thickness but a micrometer-scale edge length, offer many material design capabilities. In particular, we show that these nanoplates "copolymerize" in a predictable way with patchy spheres (Janus and triblock particles) into one- and two-dimensional structures with tunable architectural properties. We find that, on the pathway to these structures, nanoplates assemble into chains following the kinetics of molecular step-growth polymerization. In the same mechanistic framework, patchy spheres control the size distribution and morphology of assembled structures, by behaving as monofunctional chain stoppers or multifunctional branch points during nanoplate polymerization. In addition, both the lattice constant and the stiffness of the nanoplate assemblies can be manipulated after assembly. We see highly anisometric nanoplates as one representative of a broader class of dual length-scale nanoparticles, with the potential to enrich the library of structures and properties available to the nanoparticle self-assembly toolbox.

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“…For example, robust gold nanostructures have been produced by superfast dynamic compression, [2] and hydrostatic pressure has been used to convert silver nanoparticles into nanowires [3] . Although useful for many classes of materials, this Minireview will focus on how the application of pressure affects the optical properties of semiconductor nanocrystals (NCs) [4] . Semiconductor NCs possess many properties that differ greatly from those seen in their bulk forms.…”

Section: Introductionmentioning

confidence: 99%

Tailoring Optical Properties of Luminescent Semiconducting Nanocrystals through Hydrostatic, Anisotropic Static, and Dynamic Pressures

et al. 2021

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Studies on the hydrostatic-pressure-dependent optical properties of av ariety of metal-halide perovskites will be discussed below.M etal-halide perovskites (MHPs), which have the general formula ABX 3 [A = Cs + ,C H 3 NH 3 + (methylammonium, MA), HC(NH 3 ) 2 2+ (formamidinium, FA), etc.; B = Pb 2+ ,S n 2+ ,e tc.; and X = Cl, Br, or I],h ave been widely studied because of their tremendous potential for use in many optoelectronic applications,i ncluding solar cells, [18][19][20][21] LEDs, [22][23][24][25][26] photodetectors, [27,28] and scintillators. [29] Thee xceptional optical performance of MHPs can be attributed to their strong optical absorption, [30,31] low exciton binding energy, [32] long exciton diffusion lengths, [33] high carrier mobility, [34,35] defect tolerance, [36][37][38] and facile synthesis. [35,39] Lead-halide perovskites (LHPs) are ac lass of MHPs that have shown great promise as aresult of the abovementioned unique properties and their relatively high stability. [40] LHP NCs are of particular interest because of their extremely bright and narrow photoluminescence (PL) band and the ease of tuning their emission wavelengths by tuning both the halide composition and the size of the NCs. [41][42][43][44][45][46][47] Thef ollowing subsections will outline how the application of hydrostatic pressure alters the optical properties of avariety of LHP NCs. All-Inorganic CsPbX 3 PerovskitesCs + is acommonly used A-site cation in all-inorganic LHP NCs because its large ionic radius (R A = 1.88 )a llows the formation of astable perovskite phase,asdetermined by the Goldschmidt tolerance factor. [48] CsPbBr 3 NCs have been shown to possess an ear-unity photoluminescence quantum yield (PLQY), narrow (i.e.8 6meV) full width at half max (FWHM), and superior stability to both CsPbI 3 and CsPbCl 3 . [49,50] When subjected to hydrostatic pressures up to about 1.4 GPa, the PL spectra of CsPbBr 3 NCs was redshifted, widened, and decreased in intensity until ca. 1.3 GPa, at which pressure the PL was sharply quenched (Figure 1). [51] Thea uthors attributed the discontinuity to an isostructural phase transformation of the Pbnm space group. [51] Firstprinciple calculations suggested that the shift in the emission and the phase change were due to pressure-induced variations of the BrÀPb bond lengths and shrinkage of the Pb-Br-Pb bond angles within the lead bromide octahedra. [51] Interest-Angewandte Chemie Minireviews 9774 www.angewandte.org

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Pressure‐Tuned Structure and Property of Optically Active Nanocrystals

Abstract: Investigations through high-pressure X-ray scattering and spectroscopy in combination with theoretical computations shows that high-pressure compression can systematically tune the optical properties and mechanical stability of the molecular nanocrystals.

Cited by 21 publications

References 28 publications

Pyridinium‐functionalized metalloporphyrins as bifunctional catalysts for cycloaddition of epoxides and carbon dioxide

Pyridinium‐functionalized metalloporphyrins as bifunctional catalysts for cycloaddition of epoxides and carbon dioxide

Polymerization-Like Co-Assembly of Silver Nanoplates and Patchy Spheres

Tailoring Optical Properties of Luminescent Semiconducting Nanocrystals through Hydrostatic, Anisotropic Static, and Dynamic Pressures

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