Tuning of the ion release properties of silver nanoparticles buried under a hydrophobic polymer barrier
Tuning of the ion release properties of silver nanoparticles buried under a hydrophobic polymer barrier
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DOI：
10.1007/s11051-012-0928-z
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发表时间：
2012-07-01
影响因子：
2.5
通讯作者：
Faupel, F.
中科院分区：
文献类型：
--
作者：
Alissawi, N.;Zaporojtchenko, V.;Faupel, F.
调节银-聚合物纳米复合材料的银离子释放对于纳米复合材料的生物医学应用非常重要，以减少对人类细胞的潜在毒性作用。在这项工作中，使用了一个定义明确的模型系统，该系统由几乎二维的银纳米颗粒排列组成，这些纳米颗粒可以直接进入或被聚合物屏障覆盖。通过物理气相沉积技术合成了标称厚度为1.3至8.3 nm的Ag纳米颗粒（AgNPs）和聚四氟乙烯聚合物层。银离子释放的研究是伴随着控制的复合形态（银纳米粒子的大小，浓度和分布），以了解的机制和动力学的银纳米粒子的界面离子转移反应。通过紫外-可见光谱、透射电子显微镜、X射线光电子能谱和电感耦合等离子体质谱研究了AgNPs的表面等离子体共振和复合物的形貌变化以及浸泡在水中后银离子随时间的释放。表面等离子体共振的变化，复合物的形态，和Ag离子释放的动力学之间的相关性被发现.它表明，强烈的依赖性的银离子释放的颗粒的尺寸导致显着的复合物的形态和抑制的重新分配？随时间释放。还观察到，聚合物屏障稳定的复合材料的形态，并可以应用于控制银离子的释放速率。
Tuning of Ag ion release from silver-polymer nanocomposites is very important for biomedical applications of nanocomposite materials to reduce the potential toxicity effects toward human cells. In this work a well defined model system consisting of nearly two dimensional silver nanoparticle arrangements which are either directly accessible or covered by polymer barrier was used. The Ag nanoparticles (AgNPs) with nominal thickness ranging from 1.3 to 8.3 nm and the polytetrafluoroethylene polymer layers were synthesized by physical vapor deposition techniques. Study of the Ag ion release was accompanied with a control of the composite morphology (Ag nanoparticle size, concentration, and distribution) to understand the mechanism and the kinetics of the interfacial ion transfer reactions of the AgNPs. The surface plasmon resonance of the AgNPs and the composite morphology variation as well as the time-dependent release of silver ions after immersion in water were examined by UV-visible spectroscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and inductively coupled plasma mass spectrometry. A correlation between changes in the surface plasmon resonance, composite morphology, and the kinetics of Ag ion release was found. It is shown that the strong dependence of the silver ion release on the particles' size leads to significant redistribution of the composite morphology and suppression of the Ag ? release with time. It is also observed that a polymer barrier stabilizes the morphology of the composites and can be applied to control the Ag ion release rate.