A facile synthesis of multifunctional ZnO/Ag sea urchin-like hybrids as highly sensitive substrates for surface-enhanced Raman detection
A facile synthesis of multifunctional ZnO/Ag sea urchin-like hybrids as highly sensitive substrates for surface-enhanced Raman detection
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DOI：
10.1039/c3ra41203b
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发表时间：
2013-01-01
期刊：
影响因子：
3.9
通讯作者：
Chen, Qian-Wang
中科院分区：
文献类型：
--
作者：
Li, Ran;Han, Chu;Chen, Qian-Wang
通过锌盐与KOH反应生成ZnO颗粒，制备了ZnO/Ag海胆状杂化材料。随后将Ag纳米颗粒（NP）沉积到ZnO颗粒的表面上。随着光化学沉积反应的持续时间从0.5 h延长到2 h，然后8 h，Ag纳米颗粒的尺寸分别从11 nm增加到19 nm和29 nm。由于ZnO/Ag海胆状杂化材料具有高的比表面积、丰富的表面尖端和开放的形貌，有望成为有效的拉曼基底。结果表明，这些材料具有高灵敏度和良好的重现性。经计算，R6 G分子在ZnO/Ag上1360 cm（-1）处的增强因子为3 × 10（6），在1575 cm（-1）处的增强因子为2.98 × 10（6）。此外，发现相对标准偏差的最大值低于0.15。结果表明，ZnO和Ag纳米粒子之间的电子转移所产生的局部电场、“回声效应”以及ZnO分支和Ag纳米粒子之间的高纵横比都有助于Sers增强. ZnO/Ag海胆状混合物的独特形态也使其成为装载各种大分子用于基于SERS的传感和表征的理想基底。
ZnO/Ag sea urchin-like hybrids were prepared through the reaction of zinc salts with KOH to form ZnO particles. This was followed by the deposition of Ag nanoparticles (NPs) onto the surface of the ZnO particles. As the duration of the photochemical deposition reaction was extended from 0.5 h to 2 h then 8 h, the size of the Ag NPs increased from 11 nm to 19 nm and 29 nm, respectively. Due to their high surface-to-volume ratio, rich surface tips, and open morphology the ZnO/Ag sea urchin-like hybrids are expected to be effective as Raman substrates. Herein, it is shown that these materials possess high sensitivity and good reproducibility. After calculation, the enhancement factor values for R6G molecules on ZnO/Ag are 3x10(6) for the peak at 1360 cm(-1) and 2.98x10(6) for the peak at 1575 cm(-1), respectively. Additionally, the maximum value of the relative standard deviation is found to be below 0.15. It is suggested that local electric fields caused by the electron transfer between ZnO and Ag, the "echo effect'' and a high aspect ratio between ZnO branches and Ag NPs all contribute to the SERS enhancement. The distinct morphology of ZnO/Ag sea urchin-like hybrids should also make them ideal substrates for the loading of various large molecules for SERS-based sensing and characterization.