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首页> 外文期刊>Nanotechnology >The deposition of iron and silver nanoparticles in graphene-polyelectrolyte brushes
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The deposition of iron and silver nanoparticles in graphene-polyelectrolyte brushes

机译：铁和银纳米颗粒在石墨烯-聚电解质刷中的沉积

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摘要

The high surface area of graphene nanosheets (GNs) enables them to load metal nanoparticles (NPs) for various applications such as catalysis, sensors and biomedicine. To optimize the performance, it is desired to establish an effective approach that can tune the morphology of metal nanoparticles (NPs) on GNs. We here demonstrate that GNpoly(acrylic acid) (GN/PAA) brushes can control the size and spatial distributions of iron and silver NPs. Results of Raman, Fourier transform infrared and x-ray photoelectron spectroscopy confirm the covalent bonding between PAA chains and GNs. Thermogravimetric analysis reveals a PAA grafting density of ～0.055 chain nm~2. Transmission electron microscopy is used to study the effect of PAA chain length and precursor concentration on the morphology of the metal NPs deposited on PAA brushes and graphene oxide (GO). Short PAA brushes are found to be effective for controlling the spatial and size distributions of the NPs, resulting in small particle sizes and homogeneous distributions compared to those deposited on GO. The concentration of precursors has a limited effect on the dimension of the NPs in the brushes due to the key role that polyelectrolyte brushes play in controlling the growth of NPs.
机译：石墨烯纳米片（GNs）的高表面积使它们能够装载金属纳米颗粒（NPs），用于各种应用，例如催化，传感器和生物医学。为了优化性能，期望建立一种可以调整GNs上金属纳米颗粒（NPs）形态的有效方法。我们在这里证明了GNpoly（丙烯酸）（GN / PAA）刷子可以控制铁和银NP的大小和空间分布。拉曼光谱，傅立叶变换红外光谱和X射线光电子能谱的结果证实了PAA链和GN之间的共价键合。热重分析表明，PAA的接枝密度约为0.055链nm〜2。透射电子显微镜用于研究PAA链长和前体浓度对沉积在PAA刷和氧化石墨烯（GO）上的金属NP形态的影响。发现短PAA刷可有效控制NP的空间和尺寸分布，与沉积在GO上的颗粒相比，可产生较小的颗粒尺寸和均匀的分布。由于聚电解质电刷在控制NP的生长中起着关键作用，因此前体的浓度对电刷中NP的尺寸影响有限。

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