当前位置: X-MOL 学术Faraday Discuss. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
The deposition of metal nanoparticles on carbon surfaces: the role of specific functional groups
Faraday Discussions ( IF 3.4 ) Pub Date : 2018-02-20 , DOI: 10.1039/c7fd00210f
B. Bowden 1, 2, 3, 4 , M. Davies 1, 2, 3, 4 , P. R. Davies 1, 2, 3, 4 , S. Guan 1, 2, 3, 4 , D. J. Morgan 1, 2, 3, 4 , V. Roberts 1, 2, 3, 4 , D. Wotton 1, 2, 3, 4
Affiliation  

The enormous complexity of a typical heterogeneous catalyst makes understanding the development and properties of any active nanoparticles present extremely challenging. In the case of carbon based catalysts that difficulty is compounded by the variability of the carbon powders used. We have previously developed a strategy that addresses these problems by mimicking the catalyst preparation conditions very closely but using highly ordered pyrolytic graphite crystals (HOPG) as a model surface. This enables us to examine the effects of specific functional groups on nanoparticle formation. We report here an extension of our work characterising functional groups on the HOPG surface, using XPS and AFM to explore the deposition of gold from aqueous solution onto HOPG surfaces treated in a variety of ways to alter the surface functionality. The structure and oxidation state of the resulting nanoparticles depend critically on the nature of the functional groups present and offers some insight into the development of catalysts based on these materials. Hydroxyls are identified as key functional species, reducing gold ions to their metallic state whilst being oxidised themselves to carbonyls. Carbonyls meanwhile promote the nucleation of Au3+, creating a network of islands at the HOPG surface. The results have relevance not only to catalysts using activated carbons but also the new generation of materials based on graphene and carbon nanotubes.

中文翻译:

金属纳米颗粒在碳表面上的沉积:特定官能团的作用

典型的非均相催化剂的巨大复杂性使得了解目前存在的任何活性纳米粒子的发展和性能都极具挑战性。在碳基催化剂的情况下,所用碳粉的可变性加剧了困难。我们以前已经开发出了一种解决这些问题的策略,方法是非常接近地模仿催化剂的制备条件,但使用高度有序的热解石墨晶体(HOPG)作为模型表面。这使我们能够检查特定官能团对纳米颗粒形成的影响。我们在这里报告了我们在HOPG表面上表征官能团的工作的扩展,使用XPS和AFM探索了金从水溶液中沉积到HOPG表面上的情况,这些表面以各种方式改变了表面的功能性。所得纳米颗粒的结构和氧化态关键取决于存在的官能团的性质,并为基于这些材料的催化剂的开发提供一些见识。羟基被认为是关键的功能性物种,可将金离子还原为金属态,同时自身被氧化为羰基。羰基同时促进金的成核3+,在HOPG曲面上创建岛屿网络。结果不仅与使用活性炭的催化剂有关,而且与基于石墨烯和碳纳米管的新一代材料也有关。
更新日期:2018-09-03
down
wechat
bug