从废旧DVD光盘到电化学方法可控的SERS基底

表面增强拉曼散射（SERS）光谱是一种高灵敏的检测技术,但制备高活性和低成本的SERS基底仍然是一大挑战.采用低成本的商业数字视频光盘（DVD）作为载体,用电化学技术原位合成金-银（Ag-Au）复合纳米结构作为SERS基底.通过电化学粗糙化技术,无需添加硝酸银（AgNO₃）和四氯金酸（HAuCl₄）前驱体溶液,就可以在DVD光盘上的沟槽状金银反射层表面上得到Ag-Au轨道团簇形态.经过一系列表征和优化,研究了Ag-Au复合纳米结构的SERS性能.结果表明：这种DVD衍生的SERS基底对不同的拉曼探针分子均表现出优异的增强性能、高均匀性（相对标准偏差（RSD）为7.88％）和出色的稳定性.这种简便高效的制备方法以及较高的SERS活性,使得DVD衍生的SERS基底成为开发便捷和一次性传感平台的较佳选择.

From old digital video disk to SERS strips with controllable electrochemical method

For surface-enhanced Raman scattering (SERS) spectroscopy as a highly sensitive detection technique, the preparation of substrates with highly active and low cost remains a challenge. In this work, cheap commercial digital video disk (DVDs) were adopted as supports for in situ synthesis of Ag-Au composite nanostructure as SERS substrates by using electrochemical technique. Ag-Au orbital cluster morphology was obtained on the surface of gold and silver reflectors layer with a series of grooves in DVD through the method of electrochemical roughen technique, without addition of the precursor solution of AgNO₃ and HAuCl₄. After characterization and optimization, the SERS performances of the Ag-Au composite nanostructure were investigated. The results confirmed that this DVD-derived substrate exhibited excellent enhancement performance for different Raman probe molecules, high uniformity (relative standard deviation (RSD) is 7.88%), and better stability in the room temperature. Such a facile and effective preparation along with efficient SERS properties makes DVD-derived SERS substrates be very good candidates for the development of convenient and disposable sensing platforms.