One-pot Self-templated Growth of Gold Nano-frames For Enhanced SERS Performance.
One-pot Self-templated Growth of Gold Nano-frames For Enhanced SERS Performance.
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DOI：
10.1021/acsami.0c04777
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发表时间：
2020-04
影响因子：
9.5
通讯作者：
Peiyi Ye;Wenbo Xin;I. D. De Rosa;Yekan Wang;M. Goorsky;Li Zheng;Xunqian Yin;Yahong Xie
中科院分区：
文献类型：
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作者：
Peiyi Ye;Wenbo Xin;I. D. De Rosa;Yekan Wang;M. Goorsky;Li Zheng;Xunqian Yin;Yahong Xie
Au纳米框架作为一种典型的金属空心纳米结构，具有强局域表面等离子体共振（LSPR）等优异的性质，在表面增强拉曼散射（Sers）传感器中有着广泛的应用前景。在这项研究中，它是第一次，一个简单的一锅合成方法的空心Au纳米框架直接蚀刻Au纳米片，即所谓的自模板。一种新的生长机制已被揭示，涉及银和溴离子的协同作用。Ag+的存在导致观察到的Au膜厚度的自限性，而Au {111}面优先受到反应环境中Br-的存在的攻击。更重要的是，引入石墨烯以防止/最小化Au纳米框架形成期间的聚集。结合模拟和实验研究表明，由石墨烯/Au纳米框架制成的混合平台能够通过使用Sers技术检测浓度水平低至10-9 M的分析物。
As one of the representative metallic hollow nanostructures, Au nanoframes have shown fascinating properties such as strong localized surface plasmon resonance (LSPR) associated with the emerging application as surface-enhanced Raman scattering (SERS) sensors. In this study, it is demonstrated, for the first time, a facile one-pot synthetic approach for hollow Au nanoframes by directly etching Au nanoplates, i.e. so-called self-templates. A novel growth mechanism has been revealed that involves a synergistic function of Ag and Br ions. The presence of Ag+ lead to observed self-limiting of Au film thickness whereas Au {111} facets are preferentially attacked by the presence of Br- in the reaction ambient. More importantly, graphene is introduced to prevent/minimize aggregation during the formation of Au nanoframes. Combined simulation and experimental studies show that the hybrid platform made of graphene/Au nanoframes is capable of detecting analytes at concentration levels down to 10-9 M by using the SERS technique.