Chen Limiao, Jiang Dan, Liu Xiaohe, Qiu Guanzhou
School of Minerals Processing and Bioengineering, Central South University, Changsha 410083 (P.R. China), Fax: (+86) 73188879616; College of Chemistry and Chemical Engineering, Central South University, Changsha 410083 (P.R. China).
Chemphyschem. 2014 Jun 6;15(8):1624-31. doi: 10.1002/cphc.201400050. Epub 2014 Mar 26.
The availability of sensitive, reproducible, and stable substrates is critically important for surface-enhanced Raman spectroscopy (SERS)-based applications, but it presently remains a challenge. In this work, well-aligned zinc gallate (ZnGa2O4) nanorod arrays grown on a Si substrate by chemical vapor deposition were used as templates to fabricate SERS substrates by deposition of Ag nanoparticles onto the ZnGa2O4 nanorod surfaces. The coverage of the Ag nanoparticles on the ZnGa2O4 nanorod surfaces was easily controlled by varying the amount of AgNO3. SERS measurements showed that the number density of Ag nanoparticles on the ZnGa2O4 nanorod surfaces had a great effect on SERS activity. The SERS signals collected by point-to-point and SERS mapping images showed that as-prepared SERS substrates exhibited good spatial uniformity and reproducibility. Detection of melamine molecules at low concentrations (1.0×10(-7) M) was used as an example to show the possible application of such a substrate. In addition, the effect of benzoic acid on the detection of melamine was also investigated. It was found that the SERS signal intensity of melamine decreased greatly as the concentration of benzoic acid was increased.
对于基于表面增强拉曼光谱（SERS）的应用而言，具备灵敏、可重现且稳定的基底至关重要，但目前这仍是一项挑战。在本工作中，通过化学气相沉积在硅基底上生长的排列规整的镓酸锌（ZnGa₂O₄）纳米棒阵列被用作模板，通过在ZnGa₂O₄纳米棒表面沉积银纳米颗粒来制备SERS基底。通过改变硝酸银的量，可以轻松控制银纳米颗粒在ZnGa₂O₄纳米棒表面的覆盖度。SERS测量表明，ZnGa₂O₄纳米棒表面银纳米颗粒的数密度对SERS活性有很大影响。通过逐点收集的SERS信号以及SERS映射图像表明，所制备的SERS基底具有良好的空间均匀性和可重现性。以低浓度（1.0×10⁻⁷ M）三聚氰胺分子的检测为例，展示了这种基底的可能应用。此外，还研究了苯甲酸对三聚氰胺检测的影响。结果发现，随着苯甲酸浓度的增加，三聚氰胺的SERS信号强度大幅下降。
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