Co‐assemblies of Silver Nanoclusters and Fullerenols With Enhanced Third‐Order Nonlinear Optical Response

Small Methods, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 10, 2025

Abstract Exploring potential third‐order nonlinear optical (NLO) materials attracts ever‐increasing attention. Given that the atomically precise and rich adjustable structural features of silver nanoclusters (Ag NCs), as well unique π‐electron conjugated system carbon‐based nanomaterials, a supramolecular co‐assembly amplification strategy to enhance luminescent intensity NLO performance hybrids two components, are constructed relationship between structures properties investigated. By combining water soluble Ag NCs [(NH 4 ) 6 [Ag (mna) ] (H 2 mna = 2‐mercaptonicotinic acid, abbreviated ─NCs hereafter) containing uncoordinated carboxyl groups with water‐soluble fullerene derivatives modified multiple hydroxyl (fullerenols, C 60 ─OH), delocalization is expanded owing non‐covalent hydrogen bonding effect Ag6─NCs ─OH, which provides feasible basis for realizing response. Then, co‐assemblies doped into PMMA matrix prepare composite film its evaluated by Z‐scan technique. Remarkably, effective absorption coefficients β orders magnitude higher than those assemblies at absence ─OH. This work showcases new approach amplifying responses greatly facilitates development integrated photonic devices.

Language: Английский

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Semiconductor clusters enable high-efficiency extraction of hot electrons from gold nanorods for photocatalytic organic conversions

Science China Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 6, 2025

Language: Английский

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Simple and effective descriptor for measuring the nonlinear optical responses of atomic clusters

Published: July 26, 2024

Atomic clusters, a form of matter that is intermediate between atomic and condensed states, feature tremendous geometrical chemical-compositional flexibilities. Unlike inorganic crystals organic molecules, clusters escape the well-established physical model developed decades ago for predicting nonlinear optical properties, which presents opportunities achieving currently unattainable performances. However, clear conceptual guidelines designing specific geometries with maximal responses are lacking. Herein, simple efficient length descriptor determining atomic-cluster isomers reported. The response charge, newly introduced concept, reveals tunes performance by controlling electron delocalization in isomers, one-dimensional geometry providing optimal performance. Finally, behaviors quantitatively rationalized picture. intuitive rule herein expected to powerfully accelerate rational design novel materials.

Language: Английский

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Unusual Nonlinear Absorption Switching in Mixed‐Halide Perovskites by Light‐Induced Halide Segregation

Laser & Photonics Review, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 5, 2024

Abstract Mixed‐halide perovskites (MHPs) have emerged as important semiconductor materials for optoelectronic devices due to the bandgap tunability by halide composition. However, their device applications are hampered light‐induced ion migration and segregation, leading formation of lower domains with red‐shifted photoluminescence. Previous studies phase segregation in MHPs predominantly focused on linear optical properties. Herein, nonlinear absorption (NLA) properties MAPbBr 2 I films before after femtosecond laser irradiation investigated using Micro‐I‐scan technique. An unusual NLA switching from reverse‐saturable (RSA) saturable (SA) under intense illumination is found. It unveiled that initial RSA originates two‐photon uniform bromide‐rich regions as‐prepared film whereas SA occurs state filling effect newly generated low I‐rich phases irradiation. The threshold effective coefficient highly dependent distribution ions, which controllable through time. Furthermore, an all‐optical logic gate scheme demonstrated based switching. results not only unveil but also pave way realization MHPs‐based photonic devices.

Language: Английский

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The crystal structure of 1,1,1,2,2,2-hexakis(2-methyl-2-phenylpropyl)distannane,C₆₀H₇₈Sn₂

Zeitschrift für Kristallographie - New Crystal Structures, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 13, 2024

Abstract C 60 H 78 Sn 2 , cubic, Pa 3̄ (no. 206), a = 17.621(2) Å, V 5,472(2) Å 3 Z 4, R gt ( F ) 0.0214, wR ref 0.0600, T 296 (2) K.

Language: Английский

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