Green Synthesis of Large-Scale Highly Ordered Core@Shell Nanoporous Au@Ag Nanorod Arrays as Sensitive and Reproducible 3D SERS Substrates
Green Synthesis of Large-Scale Highly Ordered Core@Shell Nanoporous Au@Ag Nanorod Arrays as Sensitive and Reproducible 3D SERS Substrates
复制标题
大规模高度有序Core@Shell纳米多孔Au@Ag纳米棒阵列的绿色合成作为敏感且可重复的3D SERS基底
DOI：
10.1021/am505474n
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发表时间：
2014-09-24
影响因子：
9.5
通讯作者：
Ding, Yi
中科院分区：
文献类型：
--
作者：
Chen, Bin;Meng, Guowen;Ding, Yi
我们提出了一种简单的绿色合成方法来制备大规模和高度有序的垂直纳米孔Au纳米棒阵列，在每个纳米孔Au纳米棒(记为核@壳纳米孔Au@Ag纳米棒)上原位电沉积一层超薄的银层。由于每个纳米棒内的纳米孔和相邻纳米棒之间的间隙都产生了均匀分布在整个衬底上的三维(3D)热点，因此核壳纳米孔Au@Ag纳米棒阵列被证明是灵敏和可重复的表面增强拉曼散射(SERS)衬底。不仅检测到了通用的探针分子(罗丹明6G、R6G)，而且还检测到了非吸附分子(多氯联苯、多氯联苯)。通过对6-硫代-β-环糊精(HS-β-CD)进行修饰，有效地捕获了更多的多氯联苯分子，使多氯联苯的检测下限进一步降低到5.35×10(-7)M。作为实际应用的尝试，R6G和混合液中不同摩尔比的多氯联苯也得到了区分，在实时同时检测多种污染物方面具有很大的潜力。
We present a simple green synthetic approach to large-scale and highly ordered arrays of vertical nanoporous Au nanorods, with an ultrathin Ag-layer in situ electrodeposited on each nanoporous Au nanorod (denoted as core@shell nanoporous Au@Ag nanorod). As both the nanopores within each nanorod and the gaps between the neighboring nanorods create three-dimensional (3D) "hot spots" homogeneously distributed throughout the whole substrate, the core@shell nanoporous Au@Ag nanorod arrays were proved to be sensitive and reproducible surface-enhanced Raman scattering (SERS) substrates. Not only universal probe molecules (rhodamine 6G, R6G) but also nonadsorbing molecules (polychlorinated biphenyls, PCBs) have been detected by using the substrates. After mono-6-thio-beta-cyclodextrin (HS-beta-CD) was modified to efficiently capture more PCBs molecules, the detection limit of PCBs was further reduced to 5.35 x 10(-7)M. As a trial of practical application, R6G and PCBs with different molar ratios in their mixed solutions were identified, and two congeners of PCBs in their mixture could also be distinguished, showing great potentials in real-time simultaneous detection of multiple pollutants.