高产量和超纯Au25纳米团簇的制备：在实际应用中的实现
Preparation of high-yield and ultra-pure Au25 nanoclusters: towards their implementation in real-world applications
摘要：
胶体方法允许合成具有原子精度和尺寸范围从几个到数百个原子的Au纳米团簇（NC）。在大多数情况下，这些过程涉及一个共同的策略，硫醇蚀刻的最初多分散的Au纳米粒子到原子级精确的NC，导致在释放的Au-硫醇盐络合物作为副产物。据我们所知，在以前的研究中，既没有去除这些副产物，也没有在相关质量区域的质谱。对Au 25 NC合成中无机副产物的彻底分析表明，与其副产物相比，已公布的方案导致Au 25 NC的量非常小。提出了三种纯化方法来分离所需的Au 25 NC的副产物，提出了适用于其他有前途的Au NC系统。此外，成功合成Au 25 NC的关键因素进行了鉴定和讨论，包括残留水的作用。一个重要的发现是，蚀刻时间是非常关键的，必须通过紫外-可见光谱监测，导致合成产率高达40%。
英文摘要：
Colloidal approaches allow for the synthesis of Au nanoclusters (NCs) with atomic precision and sizes ranging from a few to hundreds of atoms. In most of the cases, these processes involve a common strategy of thiol etching of initially polydisperse Au nanoparticles into atomically precise NCs, resulting in the release of Au-thiolate complexes as byproducts. To the best of our knowledge, neither the removal of these byproducts nor the mass spectra in the relevant mass region were shown in previous studies. A thorough analysis of inorganic byproducts in the synthesis of Au25 NCs reveals that published protocols lead to Au25 NCs in vanishingly small quantities compared to their byproducts. Three purification methods are presented to separate byproducts from the desired Au25 NCs which are proposed to be applicable to other promising Au NC systems. Additionally, critical factors for a successful synthesis of Au25 NCs are identified and discussed including the role of residual water. An important finding is that the etching duration is very critical and must be monitored by UV-Vis spectroscopy resulting in synthetic yields as high as 40%.
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