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首页> 外文期刊>ACS applied materials & interfaces >Direct Cross-Linking of Au/Ag Alloy Nanoparticles into Monolithic Aerogels for Application in Surface-Enhanced Raman Scattering
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Direct Cross-Linking of Au/Ag Alloy Nanoparticles into Monolithic Aerogels for Application in Surface-Enhanced Raman Scattering

机译：Au / Ag合金纳米颗粒直接交联成整体气凝胶，用于表面增强拉曼散射

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摘要

The direct cross-linking of Au/Ag alloy nanoparticles (NPs) into high surface area, mesoporous Au/Ag aerogels via chemical oxidation of the surface ligands is reported. The precursor alloy NPs with composition-tunable morphologies were produced by galvanic replacement of the preformed Ag hollow NPs. The effect of Au:Ag molar ratio on the NP morphology and surface plasmon resonance has been thoroughly investigated and resulted in smaller Au/Ag alloy NPs (4-8 nm), larger Au/Ag alloy hollow NPs (40-45 nm), and Au/Ag alloy hollow particles decorated with smaller Au NPs (2-5 nm). The oxidative removal of surfactant ligands, followed by supercritical drying, is utilized to construct large (centimeter to millimeter) self-supported Au/Ag alloy aerogels. The resultant assemblies exhibit high surface areas (67-73 m(2)/g), extremely low densities (0.051-0.055 g/cm(3)), and interconnected mesoporous (2-50 nm) networks, making them of great interest for a number of new technologies. The influence of mesoporous gel morphology on surface-enhanced Raman scattering (SERS) has been studied using Rhodamine 101 (Rd 101) as the probe molecule. The alloy aerogels exhibit SERS signal intensities that are 10-42 times higher than those achieved from the precursor Au/Ag alloy NPs. The Au/Ag alloy aerogel III exhibits SERS sensing capability down to 1 nM level. The increased signal intensities attained for alloy aerogels are attributed to highly porous gel morphology and enhanced surface roughness that can potentially generate a large number of plasmonic hot spots, creating efficient SERS substrates for future applications.
机译：据报道，Au / Ag合金纳米颗粒（NPs）通过表面配体的化学氧化直接交联到高表面积的中孔Au / Ag气凝胶中。通过电流置换预先形成的Ag空心NP，可以生产出具有成分可调形态的前体合金NP。彻底研究了Au：Ag摩尔比对NP形态和表面等离振子共振的影响，并导致了较小的Au / Ag合金NP（4-8 nm），较大的Au / Ag合金中空NPs（40-45 nm），以及装饰有较小Au纳米颗粒（2-5 nm）的Au / Ag合金空心颗粒。表面活性剂配体的氧化去除，然后超临界干燥，被用于构建大（厘米至毫米）的自支撑金/银合金气凝胶。所得的组件表现出高的表面积（67-73 m（2）/ g），极低的密度（0.051-0.055 g / cm（3））和互连的介孔（2-50 nm）网络，这引起了人们的极大兴趣适用于许多新技术。已经使用罗丹明101（Rd 101）作为探针分子研究了介孔凝胶形态对表面增强拉曼散射（SERS）的影响。合金气凝胶的SERS信号强度比前体Au / Ag合金NP的强度高10-42倍。 Au / Ag合金气凝胶III的SERS感应能力低至1 nM。合金气凝胶获得的信号强度增加归因于高度多孔的凝胶形态和增强的表面粗糙度，可潜在地产生大量的等离子体热点，从而为将来的应用创造了高效的SERS基底。

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