NUS Graduate School for Integrative Sciences and Engineering and Department of Chemical and Biomolecular Engineering, Faculty of Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore, 119260, Singapore.
Small. 2016 May;12(19):2652-64. doi: 10.1002/smll.201503881. Epub 2016 Apr 5.
Rod-shaped assemblages of Au nanoclusters (AuNCs) can serve as self-templating solid precursors to produce tubular Au-based nanocomposites via the coalescence induced by transition metal ions. Specifically, when the AuNC assemblages react with transition metal ions with relatively high standard oxidation potentials such as Cu(II), Ag(I), Pd(II), and Au(III), a series of polycrystalline and ultrathin Au and Aux My (where M = Cu, Ag, and Pd) alloy hollow nanorods (HNRs) can be obtained with further reduction; these metallic products are evaluated for electrooxidation of methanol. Alternatively, the above transition metal ions-induced transformations can also be carried out after coating the AuNC assemblages with a layer of mesoporous SiO2 (mSiO2 ), giving rise to many mSiO2 -coated Au-based HNRs. Onto the formed AuPd0.18 alloy HNRs, furthermore, a range of transition metal oxides such as TiO2 , Co3 O4, and Cu2 O nanocrystals can be deposited easily to prepare metal oxide-AuPd0.18 HNRs nanocomposites, which can be used as photocatalysts. Compared with those conventional galvanic replacement reactions, the controlled coalescence of AuNCs induced by transition metal ions provides a novel and efficient chemical approach with improved element efficiency to tubular Au-based nanocomposites.
棒状的金纳米团簇（AuNCs）组装体可以作为自模板固体前体，通过过渡金属离子诱导的聚合并进一步还原，生成管状的基于金的纳米复合材料。具体而言，当 AuNC 组装体与具有相对较高标准氧化电位的过渡金属离子（如 Cu(II)、Ag(I)、Pd(II)和 Au(III)）反应时，可以得到一系列多晶和超薄的 Au 和 Aux My（其中 M = Cu、Ag 和 Pd）合金空心纳米棒（HNRs）；这些金属产物用于评估甲醇的电氧化。或者，也可以在 AuNC 组装体上涂覆一层介孔 SiO2（mSiO2）后进行上述过渡金属离子诱导的转化，从而得到许多 mSiO2 包覆的基于金的 HNRs。此外，在形成的 AuPd0.18 合金 HNRs 上，还可以容易地沉积一系列过渡金属氧化物，如 TiO2、Co3O4 和 Cu2O 纳米晶体，以制备金属氧化物-AuPd0.18 HNRs 纳米复合材料，其可用作光催化剂。与传统的置换反应相比，过渡金属离子诱导的 AuNC 可控聚合并进一步还原提供了一种新颖且高效的化学方法，提高了管状基于金的纳米复合材料的元素效率。
