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Au101–rGO nanocomposite: immobilization of phosphine-protected gold nanoclusters on reduced graphene oxide without aggregation
Nanoscale Advances ( IF 4.6 ) Pub Date : 2021-1-7 , DOI: 10.1039/d0na00927j Hanieh Mousavi 1 , Yanting Yin 2 , Liam Howard-Fabretto 2 , Shailendra Kumar Sharma 3 , Vladimir Golovko 3 , Gunther G Andersson 2 , Cameron J Shearer 1 , Gregory F Metha 1
Nanoscale Advances ( IF 4.6 ) Pub Date : 2021-1-7 , DOI: 10.1039/d0na00927j Hanieh Mousavi 1 , Yanting Yin 2 , Liam Howard-Fabretto 2 , Shailendra Kumar Sharma 3 , Vladimir Golovko 3 , Gunther G Andersson 2 , Cameron J Shearer 1 , Gregory F Metha 1
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Graphene supported transition metal clusters are of great interest for potential applications, such as catalysis, due to their unique properties. In this work, a simple approach to deposit Au101(PPh3)21Cl5 (Au101NC) on reduced graphene oxide (rGO) via an ex situ method is presented. Reduction of graphene oxide at native pH (pH ≈ 2) to rGO was performed under aqueous hydrothermal conditions. Decoration of rGO sheets with controlled content of 5 wt% Au was accomplished using only pre-synthesised Au101NC and rGO as precursors and methanol as solvent. High resolution scanning transmission electron microscopy indicated that the cluster size did not change upon deposition with an average diameter of 1.4 ± 0.4 nm. It was determined that the rGO reduction method was crucial to avoid agglomeration, with rGO reduced at pH ≈ 11 resulting in agglomeration. X-ray photoelectron spectroscopy was used to confirm the deposition of Au101NCs and show the presence of triphenyl phosphine ligands, which together with attenuated total reflectance Fourier transform infrared spectroscopy, advocates that the deposition of Au101NCs onto the surface of rGO was facilitated via non-covalent interactions with the phenyl groups of the ligands. Inductively coupled plasma mass spectrometry and thermogravimetric analysis were used to determine the gold loading and both agree with a gold loading of ca. 4.8–5 wt%. The presented simple and mild strategy demonstrates that good compatibility between size-specific phosphine protected gold clusters and rGO can prevent aggregation of the metal clusters. This work contributes towards producing an agglomeration-free synthesis of size-specific ligated gold clusters on rGO that could have wide range of applications.
中文翻译：
Au101-rGO 纳米复合材料：将磷化氢保护的金纳米团簇固定在还原的氧化石墨烯上而不聚集
石墨烯支撑的过渡金属簇由于其独特的性质而对潜在的应用（例如催化）具有极大的兴趣。在这项工作中，提出了一种通过非原位方法在还原氧化石墨烯 (rGO) 上沉积 Au 101 (PPh 3 ) 21 Cl 5 (Au 101 NC)的简单方法。在水热条件下将天然 pH 值（pH ≈ 2）的氧化石墨烯还原为 rGO。仅使用预合成的 Au 101即可完成 5 wt% Au 受控含量的 rGO 片材的装饰NC 和 rGO 作为前体，甲醇作为溶剂。高分辨率扫描透射电子显微镜表明，簇大小在沉积时没有变化，平均直径为 1.4 ± 0.4 nm。已确定 rGO 还原方法对于避免团聚至关重要，rGO 在 pH ≈ 11 时还原会导致团聚。X 射线光电子能谱用于确认 Au 101 NCs 的沉积并显示三苯基膦配体的存在，这与衰减全反射傅里叶变换红外光谱一起主张促进 Au 101 NCs 在 rGO 表面上的沉积通过与配体的苯基的非共价相互作用。电感耦合等离子体质谱法和热重分析用于确定金负载量，两者都与约 10的金负载量一致。4.8–5 重量%。所提出的简单而温和的策略表明，特定尺寸的膦保护金簇与 rGO 之间的良好相容性可以防止金属簇的聚集。这项工作有助于在 rGO 上产生一种无团聚的合成尺寸特定的连接金簇，这种合成可能具有广泛的应用。
更新日期：2021-01-25
中文翻译：
Au101-rGO 纳米复合材料：将磷化氢保护的金纳米团簇固定在还原的氧化石墨烯上而不聚集
石墨烯支撑的过渡金属簇由于其独特的性质而对潜在的应用（例如催化）具有极大的兴趣。在这项工作中，提出了一种通过非原位方法在还原氧化石墨烯 (rGO) 上沉积 Au 101 (PPh 3 ) 21 Cl 5 (Au 101 NC)的简单方法。在水热条件下将天然 pH 值（pH ≈ 2）的氧化石墨烯还原为 rGO。仅使用预合成的 Au 101即可完成 5 wt% Au 受控含量的 rGO 片材的装饰NC 和 rGO 作为前体，甲醇作为溶剂。高分辨率扫描透射电子显微镜表明，簇大小在沉积时没有变化，平均直径为 1.4 ± 0.4 nm。已确定 rGO 还原方法对于避免团聚至关重要，rGO 在 pH ≈ 11 时还原会导致团聚。X 射线光电子能谱用于确认 Au 101 NCs 的沉积并显示三苯基膦配体的存在，这与衰减全反射傅里叶变换红外光谱一起主张促进 Au 101 NCs 在 rGO 表面上的沉积通过与配体的苯基的非共价相互作用。电感耦合等离子体质谱法和热重分析用于确定金负载量，两者都与约 10的金负载量一致。4.8–5 重量%。所提出的简单而温和的策略表明，特定尺寸的膦保护金簇与 rGO 之间的良好相容性可以防止金属簇的聚集。这项工作有助于在 rGO 上产生一种无团聚的合成尺寸特定的连接金簇，这种合成可能具有广泛的应用。
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