Modulating luminescent behaviors of Au nanoclusters via supramolecular strategies

doi:10.11949/0438-1157.20221055

Abstract

Abstract:

Au nanoclusters (AuNCs) stand out in the fields of catalysis, bioimaging, sensing, analytical detection, drug delivery, displaying and illumination owing to their abundant optical properties and unique nanostructures. However, the low quantum yield (QY) and single emissive band seriously hinder the development prospects of most AuNCs, and the preparation of AuNCs with tunable luminescence, high QY, and long luminescent lifetime has become current research focus in this field. Supramolecular strategies such as host-guest inclusion, embedding in polymer matrix, hydrogen bonding and electrostatic interactions have been widely used to control the luminescent behavior of AuNCs and improve their QY. In view of this, this review systematically expounds the mechanism of supramolecular strategies to modulate the luminescent behavior of AuNCs, summarizes the recent research progress in the construction and regulation of multifunctional AuNCs based on supramolecular strategies, and looks forward to the opportunities and challenges in the field of AuNC luminescence.

Key words: nanomaterials, Au nanoclusters, photochemistry, modulate luminescence, supramolecular assembly, nanoparticles

摘要：

金纳米团簇(金簇)凭借其丰富的光学性能和独特的纳米结构在催化、生物成像、传感、分析检测、药物传送、显示和照明等领域脱颖而出。然而，较低的量子产率和单一的发光波段严重阻碍了金簇的发展前景，制备可调谐、高量子产率、长寿命的金簇已成为目前该领域的研究重点。主客体包结、嵌入聚合物基质以及氢键、静电作用力等超分子策略已被广泛用于调控金簇的发光行为，有效地提高金簇发光量子产率。鉴于此，系统阐述了超分子策略调控金簇发光行为的机理，总结了近年来基于超分子策略构建及调控多功能金簇发光行为的研究进展，并展望了金簇发光领域面临的机遇与挑战。

关键词: 纳米材料, 金纳米团簇, 光化学, 调控发光, 超分子组装, 纳米粒子

CLC Number:

TQ 050.4

Guojuan QU, Tao JIANG, Tao LIU, Xiang MA. Modulating luminescent behaviors of Au nanoclusters via supramolecular strategies[J]. CIESC Journal, 2023, 74(1): 397-407.

曲国娟, 江涛, 刘涛, 马骧. 超分子策略调控金纳米团簇的发光行为[J]. 化工学报, 2023, 74(1): 397-407.

Figures/Tables 4

Fig.1 Jablonski diagram for the fundamental photophysical process of AuNCs

Fig.2 (a) Synthesis of AuNCs@β-CD and loading on the surface of TiO2 NPs to enhance photocatalytic activity and improve the degradation rate of organic pollutants [62]; (b) Synthesis process of β-CD@AuNCs and its detections of dopamine and cholesterol [63-64]; (c) Synthesis process of near-infrared β-CD@AuNCs[65]; (d) Bright near-infrared second region (NIR-Ⅱ) AuNCs synthesized through β-CD as ligand and used to track labeled proteins to realize targeted tumor visualization[66]

Fig.3 (a) Luminescent nanoswitches constructed based on supramolecular assembly strategy to regulate the luminescence of CC/DTT-AuNCs[75]; (b) Fluorescence-to-phosphorescence switching of molecular AuNCs induced by aggregation[76]; (c) AuNCs@histidine and poly-BrNpA doped into PVA matrix to regulate luminescence[77]; (d) GSH-AuNCs and host-guest supramolecular constructed temperature-humidity dual-responsive luminescent materials through self-assembly strategy[78]

Fig.4 (a) Enhanced green luminescence of water-soluble ATT-AuNCs through host-guest interaction between ATT-AuNCs and arginine[80]; (b) Brighten FGGC-AuNCs in aqueous solution based on host-guest inclusion strategy between CB and the surface ligands of FGGC-AuNCs[82]; (c) Chitosan mediated Au(0)@Au(Ⅰ)-SG NCs with different luminescence to form reversible gels under supramolecular forces[84]; (d) GSH@AuNCs as cross-linkers to construct hydrogels and utilize their abundant hydrogen bond network structures enhancing the luminescence of GSH@AuNCs[85]

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