Wang Jun Feng, Wu Xue Zhong, Xiao Rui, Dong Pei Tao, Wang Chao Guang
College of Mechatronics and Automation, National University of Defense Technology, Changsha, Hunan, P. R. China; State Key Laboratory of Transducer Technology, Chinese Academy of Science, Shanghai, P. R. China.
College of Mechatronics and Automation, National University of Defense Technology, Changsha, Hunan, P. R. China.
PLoS One. 2014 Jun 2;9(6):e97976. doi: 10.1371/journal.pone.0097976. eCollection 2014.
A new high-performance surface-enhanced Raman scattering (SERS) substrate with extremely high SERS activity was produced. This SERS substrate combines the advantages of Au film over nanosphere (AuFON) substrate and Ag nanoparticles (AgNPs). A three order enhancement of SERS was observed when Rhodamine 6G (R6G) was used as a probe molecule to compare the SERS effects of the new substrate and commonly used AuFON substrate. These new SERS substrates can detect R6G down to 1 nM. The new substrate was also utilized to detect melamine, and the limit of detection (LOD) is 1 ppb. A linear relationship was also observed between the SERS intensity at Raman peak 682 cm(-1) and the logarithm of melamine concentrations ranging from 10 ppm to 1 ppb. This ultrasensitive SERS substrate is a promising tool for detecting trace chemical molecules because of its simple and effective fabrication procedure, high sensitivity and high reproducibility of the SERS effect.
制备了一种具有极高表面增强拉曼散射（SERS）活性的新型高性能SERS基底。这种SERS基底结合了纳米球上金膜（AuFON）基底和银纳米颗粒（AgNPs）的优点。当使用罗丹明6G（R6G）作为探针分子来比较新基底和常用的AuFON基底的SERS效应时，观察到SERS增强了三个数量级。这些新型SERS基底能够检测低至1 nM的R6G。新基底还被用于检测三聚氰胺，检测限（LOD）为1 ppb。在拉曼峰682 cm(-1)处的SERS强度与三聚氰胺浓度在10 ppm至1 ppb范围内的对数之间也观察到线性关系。这种超灵敏的SERS基底因其简单有效的制备过程、高灵敏度和SERS效应的高重现性，是检测痕量化学分子的一种有前景的工具。
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