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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Swelling of Composite Films at Interfaces
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Swelling of Composite Films at Interfaces

机译：界面处复合膜的溶胀

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摘要

Composite materials made of metallic nanoparticles embedded in an organic matrix are highly promising candidates as coatings for novel chemical sensors. Micromechanical cantilever measurements revealed that the Au-nanoparticle terphenyldifhiol composite material swells upon dosing with toluene vapor. The mass increase was found to be linear with the toluene vapor concentration, ≈ 40 fg/ppm. Furthermore, significant differences in the mechanical transduction of ≈100 nm thick Au-nanoparticle terphenyldithiol composite material that was prepared on a 3-aminopropyldimethylmonoethoxysilane (APDMES) surface and on a Au surface were observed. The transduction of swelling of the composite film into a mechanical deflection was found to be more efficient for the composite film prepared on the Au surface attributed to covalent binding of the terphenyldithiol molecules with the Au surface. In contrast, the interface of the APDMES layer and the Au-terphenyldithiol composite material is based on electrostatic interaction between the Au nanoparticles and the amino interface. The analysis of the micromechanical cantilever sensor measurements lead to the conclusion that the composite film at the APDMES interface is more mobile compared to a similar film that was prepared on Au.
机译：由嵌入有机基质中的金属纳米颗粒制成的复合材料非常有希望成为新型化学传感器的涂层。微机械悬臂测量表明，金纳米颗粒三苯基联苯二酚复合材料在加入甲苯蒸气后溶胀。发现质量增加与甲苯蒸气浓度≈40 fg / ppm呈线性关系。此外，观察到在3-氨丙基二甲基单乙氧基硅烷（APDMES）表面和Au表面上制备的≈100nm厚的Au-纳米颗粒三苯基联硫醇复合材料的机械转导存在显着差异。对于在Au表面上制备的复合膜，由于三联苯二硫醇分子与Au表面的共价结合，发现将复合膜的溶胀转变为机械挠曲更有效。相反，APDMES层和Au-terphenyldithiol复合材料的界面是基于Au纳米粒子和氨基界面之间的静电相互作用。对微机械悬臂梁传感器测量结果的分析得出的结论是，与在Au上制备的类似薄膜相比，APDMES界面处的复合薄膜更具流动性。

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