Synthesis of wheatear-like ZnO nanoarrays decorated with Ag nanoparticles and its improved SERS performance through hydrogenation
Synthesis of wheatear-like ZnO nanoarrays decorated with Ag nanoparticles and its improved SERS performance through hydrogenation
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银纳米颗粒修饰的麦穗状 ZnO 纳米阵列的合成及其通过氢化提高 SERS 性能
DOI：
10.1088/0957-4484/27/14/145502
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发表时间：
2016-04-08
期刊：
影响因子：
3.5
通讯作者：
Huang, Zhengren
中科院分区：
文献类型：
--
作者：
Shan, Yufeng;Yang, Yong;Huang, Zhengren
半导体/贵金属Sers基底由于其独特的双功能性而得到了广泛的研究。本文采用改进的低温溶液法制备了麦穗状ZnO纳米阵列。由ZnO纳米片和长晶须堆叠而成的分级纳米结构具有大量的特征性纳米角和纳米边，这被证明有利于存款更多的Ag纳米颗粒（NPs）的沉积。此外，氢化麦穗状ZnO/AgNP复合基板是通过一个安全和容易的固体氢源（NaBH 4）。氢化后的ZnO/AgNPs（H-ZnO/Ag）基底对R6 G分子的Sers活性有了很大的提高，增强因子（EF）高达10.49 × 108，比氢化前的基底提高了两个数量级以上。麦穗状H-ZnO/Ag基底的优异Sers性能得益于ZnO的多孔结构和氢化引入的大量表面缺陷。此外，所制备的基底还表现出较高的检测灵敏度、良好的重复性和可回收性，具有很大的实际应用潜力。
Semiconductor/noble metal composite SERS substrates have been extensively studied due to their unique bifunctionality. In this work, wheatear-like ZnO nanoarrarys have been fabricated via a modified low-temperature solution method. The hierarchical nanostructures that are constructed by stacked nanoflakes and long whiskers of ZnO possess a substantial number of characteristic nano corners and edges, which are proved to be beneficial to deposit more Ag nanoparticles (NPs). Furthermore, hydrogenated wheatear-like ZnO/AgNP composite substrates are achieved via a safe and facile solid hydrogen source (NaBH4). The hydrogenated ZnO/AgNPs (H-ZnO/Ag) substrates exhibit greatly improved SERS activity in detecting R6G molecules with an enhancement factor (EF) up to ∼0.49 × 108, over two orders of magnitude higher than that of the substrates before hydrogenation. The outstanding SERS performance of wheatear-like H-ZnO/Ag substrates benefits from the emerging porous structure of ZnO and abundant surface defects introduced by hydrogenation. In addition, the as-prepared substrates also show high detection sensitivity, good repeatability and recyclability, indicating great potential for practical applications.