银/金纳米线阵列表面增强拉曼基底的制备及对孔雀石绿的高灵敏度检测

利用种子介导的软模板生长方法制备了金纳米线(Au NWs)阵列, 通过调节生长温度控制Au NWs阵列的形貌, 最后在经硼氢化钠(NaBH₄)清洗过的Au NWs阵列上化学沉积银纳米颗粒(Ag NPs), 制得银/金纳米线(Ag/Au NWs)阵列作为表面增强拉曼散射(SERS)基底. 选用罗丹明6G(R6G)作为拉曼探针分子测定了Ag/Au NWs阵列的SERS性能. 结果表明, Ag/Au NWs阵列作为SERS基底具有高灵敏度、 优异的信号均匀性和良好的稳定性. 使用Ag/Au NWs阵列对孔雀石绿(MG)检测的检出限可低至1×10^-8 mol/L, 线性范围为 1×10^-8~1×10^-4 mol/L. NaBH₄可以在不影响SERS性能的情况下去除Ag/Au NWs阵列上吸附的分子, 使得 SERS基底可以重复使用. 使用Ag/Au NWs阵列对湖水中的MG进行检测, 得到了可靠的回收率, 证明Ag/Au NWs 阵列在检测环境水体中的孔雀石绿上具有应用潜力.

Fabrication of Ag/Au Nanowires Array as a SERS Substrate for High-sensitivity Malachite Green Detection

In this work， Au nanowires（Au NWs） array was prepared through a seed-mediated soft template growth method， in which the morphology and structure of the Au NWs array can be controlled by adjusting the growth temperature. Silver nanoparticles（Ag NPs） were modified on the Au NWs array cleaned with sodium borohydride （NaBH₄） to prepare the silver/gold nanowires（Ag/Au NWs） array as the surface enhanced Raman scattering（SERS） substrate. The SERS performance of Ag/Au NWs array was investigated by testing rhodamine 6G（R6G）， a Raman probe molecule. The results indicate that Ag/Au NWs array as SERS substrate showed high sensitivity， excellent signal homogeneity and good stability. In the detection of malachite green in water， Ag/Au NWs array exhibited low detection limit of 1×10^-8 mol/L， and a wide linear range from 1×10^-8 mol/L to 1×10^-4 mol/L. In addition， NaBH₄ can remove adsorbed molecules on Ag/Au NWs array without affecting SERS performance， which allowing the SERS substrate to be recyclable. Reliable recovery rate obtained in real sample tests indicate that Ag/Au nanowires array has great potential in SERS detection of malachite green in environmental water.