超亲疏水图案表面PS微球拉膜法制备SERS基底及SERS效应趋势

Preparation of SERS Substrate by PS Microspheres Film-Drawing Method on Super-Hydrophilic/hydrophobic Patterned Surface and its SERS Effect

利用超亲水表面或图案化表面抑制“咖啡环效应”可获得均匀单层分散的纳米粒子阵列的原理,采用“拉膜法”在亲水点上组装PS微球精密单层阵列,结合反应等离子刻蚀(RIE)和磁控溅射技术调控微球间距和获得币族金属表面,制备SERS活性基底,初步研究了其SERS效应的趋势。结果表明,使用该法可以获得较大面积(直径10微米)的单层有序微球阵列,并结合反应等离子体刻蚀和磁控溅射Au的方法制备间距可控的金属微球阵列,电镜观测表明,球的间距可控制到10纳米以下。吸附吡啶分子后进行表面增强拉曼光谱检测,拉曼信号随间距的减小呈指数增加趋势。

Super-hydrophilic/hydrophobic surface or patterned surface was used to suppress the coffee ring effect,and uniform monodispersing nanoparticle arrays were obtained.Precise monolayer arrays of PS microspheres were assembled on hydrophilic sites by film-drawing method.Reactive plasma etching(RIE)and magnetron sputtering were used to control the space between microspheres and obtain coin-metal surface.SEM showed that a large area of SERS substrates(Diameter 10um)were fabricated through sputtering Au on microspheres(space between microspheres could be controlled below 10nm),and SERS detections were carried out using pyridine as the probe molecule.It was found that the intensity of SERS signal increased exponentially with decrease of space between microspheres.