Highly Luminescent Gold Nanocluster Frameworks,Advanced Optical Materials

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Highly Luminescent Gold Nanocluster Frameworks
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2019-07-30 , DOI: 10.1002/adom.201900620
Sourov Chandra ₁ , Nonappa _{1,

2} , Grégory Beaune ₁ , Anirban Som ₁ , Shaochen Zhou ₁ , Jouko Lahtinen ₁ , Hua Jiang ₁ , Jaakko V. I. Timonen ₁ , Olli Ikkala _{1,

2} , Robin H. A. Ras _{1,

2}

Affiliation

Metal nanoclusters (NCs) are being intensely pursued as prospective luminophores because of their tunable electronic and optical properties. Among the various fluorescent NCs, gold nanoclusters (GNCs) are attractive due to their biocompatibility and excellent photostability, even if so far, they have had limited application potential due to poor quantum yield (QY). In this context, a facile route is demonstrated to tune up the photophysical and photochemical activities of water‐borne luminescent GNCs through the formation of self‐assembled nanocluster superstructures. The approach involves the controlled introduction of Sn²⁺ ions, directing GNCs from individual particles into 3D spherical gold nanocluster colloidal frameworks (GNCFs). In these, the reduction in the nonemissive relaxation pathways leads to significant enhancement of luminescence signals (QY from ≈3.5% to ≈25%), likely owing to restricted movements of ligands. This approach paves ways for GNCFs as a potent agent for biomedical imaging and therapies, while their high photocatalytic activity is an added advantage.

中文翻译：

高发光金纳米集群框架

由于金属纳米团簇（NCs）具有可调节的电子和光学特性，它们被强烈地用作准发光体。在各种荧光NC中，金纳米团簇（GNC）由于其生物相容性和出色的光稳定性而具有吸引力，即使到目前为止，由于量子产率（QY）较差，它们的应用潜力也很有限。在这种情况下，通过形成自组装的纳米团簇超结构来证明一种简便的途径可以调节水基发光GNC的光物理和光化学活性。该方法涉及以受控方式引入Sn ²⁺离子，将GNC从单个粒子引导到3D球形金纳米簇胶体框架（GNCF）中。在这些中，非放宽松弛途径的减少导致发光信号的显着增强（QY从≈3.5％增至≈25％），这可能是由于配体的运动受限所致。这种方法为GNCF作为生物医学成像和治疗的有效剂铺平了道路，而它们的高光催化活性是其附加的优势。

更新日期：2019-10-21

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