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Fluorescence enhancement of water-soluble silver nanoclusters via Au doping

机译:通过Au掺杂荧光增强水溶性银纳米团簇的荧光增强

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摘要

Metal nanoclusters (NCs) have attracted much attention due to their unique properties. Silver (Ag) NCs are potential candidates for fluorescence bioimaging, but poor fluorescence of Ag NCs hinders their potential application. Atomic doping provides a feasible route toward improving the brightness of the clusters, but is limited to water-insoluble systems. Herein, we successfully enhance the fluorescence property of water-soluble Ag NCs by doping Au using a reduction method with dihydrolipoic acid as the ligand. Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy proved that Au was successfully doped into Ag NCs by forming bimetallic NCs. The optical properties were analyzed using ultraviolet–visible absorption, photoluminescence, and time-resolved fluorescence spectroscopy. The results indicated that the Ag NCs with 10% Au doping content (AgAu NCs) had an 11-time increase in quantum yield compared to pure Ag NCs. Meanwhile, the sample shows good photostability for 30 min.
机译:由于其独特的特性,金属纳米烛台(NCS)引起了很多关注。银(Ag)NCS是荧光生物成像的潜在候选者,但AG NCS的荧光差阻碍了它们的潜在应用。原子掺杂提供了改善簇的亮度的可行途径,但仅限于水不溶性系统。在此,我们通过使用二氢辛酸作为配体的还原方法成功地通过掺杂Au来增强水溶性Ag NCs的荧光性能。傅里叶变换红外光谱和X射线光电子能力证明,通过形成双金属NCs成功地掺杂到Ag NC中。使用紫外线可见吸收,光致发光和时间分辨荧光光谱分析光学性质。结果表明,与纯Ag NCS相比,具有10%掺杂含量(Alau NCs)的Ag NCs的量子产率为11次增加。同时,样品显示出良好的光稳定性30分钟。

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