Interaction of gold nanoparticles with thermoresponsive microgels: influence of the cross-linker density on optical properties
Interaction of gold nanoparticles with thermoresponsive microgels: influence of the cross-linker density on optical properties
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DOI：
10.1039/c3cp51578h
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发表时间：
2013-01-01
影响因子：
3.3
通讯作者：
von Klitzing, Regine
中科院分区：
文献类型：
--
作者：
Gawlitza, Kornelia;Turner, Sarah T.;von Klitzing, Regine
报道了球形金纳米颗粒 (Au-NP) 与由化学交联的聚（N-异丙基丙烯酰胺）组成的微凝胶的相互作用。两种组分的简单混合导致金颗粒吸附到微凝胶上。通过改变金颗粒与微凝胶颗粒的比例可以实现不同的负载密度。通过 TEM、UV-Vis 吸收光谱和 SAXS 分析金纳米颗粒的吸附情况。通过使用具有三种不同交联剂密度的微凝胶，研究了微凝胶网格尺寸对金纳米颗粒吸附的影响。结果表明纳米颗粒渗透深度与交联剂密度之间存在密切关系。反过来，由于等离子体共振耦合，这直接影响胶体的光学性质。此外，还获得了有关微凝胶的网格尺寸分布的信息。 SAXS 首次证明，通过改变交联剂密度和温度而导致的光学特性变化与金颗粒二聚体的形成直接相关。
The interaction of spherical gold nanoparticles (Au-NPs) with microgels composed of chemically cross-linked poly-(N-isopropylacrylamide) is reported. Simple mixing of the two components leads to adsorption of the gold particles onto the microgels. Different loading densities can be achieved by varying the ratio of gold particles to microgel particles. The adsorption of gold nanoparticles is analysed by TEM, UV-Vis absorption spectroscopy and SAXS. The influence of the microgel mesh size on the adsorption of gold nanoparticles is investigated by using microgels with three different cross-linker densities. The results suggest a strong relationship between the nanoparticle penetration depth and the cross-linker density. This, in turn, directly influences the optical properties of the colloids due to plasmon resonance coupling. In addition, information about the mesh size distribution of the microgels is obtained. For the first time the change in optical properties by varying cross-linker density and temperature is directly related to the formation of dimers of gold particles, proven by SAXS.