Advances in Nano Research最新文献

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Molecular interactions between pre-formed metal nanoparticles and graphene families. 预先形成的金属纳米颗粒和石墨烯家族之间的分子相互作用。

IF 5.7 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Advances in Nano Research

Pub Date : 2018-12-01

Serena Low, Young-Seok Shon

Two dimensional (2D) atomic layered nanomaterials exhibit some of the most striking phenomena in modern materials research and hold promise for a wide range of applications including energy and biomedical technologies. Graphene has received much attention for having extremely high surface area to mass ratio and excellent electric conductivity. Graphene has also been shown to maximize the activity of surface-assembled metal nanoparticle catalysts due to its unique characteristics of enhancing mass transport of reactants to catalysts. This paper specifically investigates the strategy of pre-formed nanoparticle self-assembly used for the formation of various metal nanoparticles supported on graphene families such as graphene, graphene oxide, and reduced graphene oxide and aims at understanding the interactions between ligand-capped metal nanoparticles and 2D nanomaterials. By varying the functional groups on the ligands between alkyl, aromatic, amine, and alcohol groups, different interactions such as van der Waals, π-π stacking, dipole-dipole, and hydrogen bonding are formed as the 2D hybrids produced.

二维(2D)原子层状纳米材料在现代材料研究中表现出一些最引人注目的现象，并有望在包括能源和生物医学技术在内的广泛应用中发挥作用。石墨烯因具有极高的表面积质量比和优异的导电性而备受关注。石墨烯还被证明可以最大限度地提高表面组装金属纳米颗粒催化剂的活性，因为它具有增强反应物向催化剂的质量传输的独特特性。本文专门研究了预先形成的纳米颗粒自组装策略，该策略用于在石墨烯家族(如石墨烯、氧化石墨烯和还原氧化石墨烯)上形成各种金属纳米颗粒，旨在了解配体覆盖的金属纳米颗粒与二维纳米材料之间的相互作用。通过改变配体上烷基、芳香、胺和醇基团之间的官能团，不同的相互作用，如范德华、π-π堆叠、偶极子-偶极子和氢键形成二维杂化体。

引用次数: 0

Heat-induced coarsening of layer-by-layer assembled mixed Au and Pd nanoparticles. 逐层组装金钯混合纳米颗粒的热致粗化。

IF 5.7 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Advances in Nano Research

Pub Date : 2014-02-01 DOI: 10.12989/anr.2014.2.1.057

Young-Seok Shon, Dayeon Judy Shon, Van Truong, Diego J Gavia, Raul Torrico, Yohannes Abate

This article shows the coarsening behavior of nanoparticle multilayers during heat treatments which produce larger metallic nanostructures with varying shapes and sizes on glass slides. Nanoparticle multilayer films are initially constructed via the layer-by-layer self-assembly of small and monodispersed gold and/or palladium nanoparticles with different compositions (gold only, palladium only, or both gold and palladium) and assembly orders (compounding layers of gold layers over palladium layers or vice versa). Upon heating the slides at 600°C, the surface nanoparticles undergo coalescence becoming larger nanostructured metallic films. UV-Vis results show a clear reliance of the layering sequence on the optical properties of these metal films, which demonstrates an importance of the outmost (top) layers in each nanoparticle multilayer films. Topographic surface features show that the heat treatments of nanoparticle multilayer films result in the nucleation of nanoparticles and the formation of metallic cluster structures. The results confirm that different composition and layering sequence of nanoparticle multilayer films clearly affect the coalescence behavior of nanoparticles during heat treatments.

本文研究了纳米颗粒多层膜在热处理过程中的粗化行为，从而在玻片上产生较大的、形状和尺寸各异的金属纳米结构。纳米颗粒多层膜最初是通过小的单分散的金和/或钯纳米颗粒的逐层自组装而构建的，这些纳米颗粒具有不同的成分(仅金，仅钯，或同时具有金和钯)和组装顺序(金层在钯层上复合层，反之亦然)。在600℃下加热载玻片后，表面纳米颗粒发生聚并，形成更大的纳米结构金属薄膜。UV-Vis结果显示，这些金属薄膜的光学性质明显依赖于层序，这表明每个纳米颗粒多层膜中最外层(顶层)的重要性。纳米颗粒多层膜的表面形貌特征表明，热处理导致纳米颗粒成核，形成金属团簇结构。结果表明，纳米颗粒多层膜的不同组成和层序对热处理过程中纳米颗粒的聚并行为有明显影响。

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