Silver Clusters in Zeolites: From Self-Assembly to Ground-Breaking Luminescent Properties

被引:78
作者
Coutino-Gonzalez, Eduardo [1 ,2 ]
Baekelant, Wouter [1 ]
Steele, Julian A. [3 ]
Kim, Cheol Woong [1 ]
Roeffaers, Maarten B. J. [3 ]
Hofkens, Johan [1 ]
机构
[1] Katholieke Univ Leuven, Chem&Tech Mol Imaging & Photon, Celestijnenlaan 200F, B-3001 Leuven, Belgium
[2] CONACYT Ctr Invest & Desarrollo Tecnol Electroqui, Parque Ind Queretaro,Sanfandila S-N, Pedro Escobedo 76703, Queretaro, Mexico
[3] Katholieke Univ Leuven, Chem&Tech Ctr Surface Chem & Catalysis, Celestijnenlaan 200F, B-3001 Leuven, Belgium
关键词
OPTICAL-PROPERTIES; INFRARED-SPECTROSCOPY; FAUJASITE ZEOLITES; CRYSTAL-STRUCTURES; AG CLUSTERS; NANOCLUSTERS; FLUORESCENCE; IRRADIATION; OXIDATION; EMISSION;
D O I
10.1021/acs.accounts.7b00295
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Interest for functional silver clusters (AgCLs) has rapidly grown over years due to large advances in the field of nanoscale fabrication and materials science. The continuous development of strategies to fabricate small-scale silver clusters, together with their interesting physicochemical properties (molecule -like discrete energy levels, for example), make them very attractive for a wide variety of applied research fields, from biotechnology and the environmental sciences to fundamental chemistry and physics. Apart from useful catalytic properties, silver clusters (Ag-n, n < 10) were recently shown to also exhibit exceptional optical properties. The optical properties and performance of Ag-CLs offer strong potential for their integration into appealing micro(nano)-optoelectronic devices. To date, however, the rational design and directed synthesis of Ag-CLs with specific functionalities has remained elusive. The inability for rational design stems mainly from a lack of understanding of their novel atomic-scale phenomena. This is because accurately studying silver cluster systems at such a scale is hindered by the perturbations introduced during exposure to various experimental probes. For instance, silver possesses a strong tendency to cluster and form ever-larger Ag aggregates while probed with high-energy electron beams and X-ray irradiation. As well, there exists a need to provide a stabilizing environment for which Ag clusters can persist, setting up a complex interacting guest host system, as isolated silver clusters are confined within a suitable hosting medium. Fundamental research into Ag-n(delta+) formation mechanisms and their important optical properties is paramount to establishing truly informed synthesis protocols. Over recent years, we have developed several protocols for the ship-in-a-bottle synthesis of highly luminescent Ag-CLs within the microporous interiors of zeolite frameworks. This approach has yielded materials displaying a wide variety of optical properties, offering a spectrum of possible applications, from nano(micro)photonic devices to smart luminescent labels and sensors. The versatility of the Ag zeolite multicomponent system is directly related to the intrinsic and complex tunability of the system as a whole. There are several key zeolite parameters that confer properties to the clusters, namely, the framework Si/Al ratio, choice of counterbalancing ions, silver loading, and zeolite topology, and cannot be overlooked. This Account is intended to shed light on the current state-of-the-art of luminescent Ag-CLs confined in zeolitic matrices, emphasizing the use of combinatorial approaches to overcome problems associated with the correct characterization and correlation of their structural, electronic, and photoluminescence properties, all to establish the important design principles for developing functional silver zeolite-based materials. Additionally, examples of emerging applications and future perspectives for functional luminescent Ag zeolite materials are addressed in this Account.
引用
收藏
页码:2353 / 2361
页数:9
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