State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics & Tsinghua-Foxconn Nanotechnology Research Center, Tsinghua University , Beijing 100084, China.
Collaborative Innovation Center of Quantum Matter, Beijing 100084, China.
ACS Appl Mater Interfaces. 2017 Sep 20;9(37):32369-32376. doi: 10.1021/acsami.7b08807. Epub 2017 Sep 5.
We introduce a simple and cost-effective approach for fabrication of effective surface-enhanced Raman spectroscopy (SERS) substrates. It is shown that the as-fabricated substrates show excellent SERS effects in various probe molecules with high sensitivity, that is, picomolar level detection, and also good reliability. With a SERS enhancement factor beyond 10 and excellent reproducibility (deviation less than 5%) of signal intensity, the fabrication of the SERS substrate is realized on a four-inch wafer and proven to be effective in pesticide residue detection. The SERS substrate is realized first through the fabrication of quasi-periodic nanostructured silicon with dimension features in tens of nanometers using superaligned carbon nanotubes networks as an etching mask, after which a large amount of hot spots with nanometer gaps are formed through deposition of a gold film. With rigorous nanostructure design, the enhanced performance of electromagnetic field distribution for nanostructures is optimized. With the advantage of cost-effective large-area preparation, it is believed that the as-fabricated SERS substrate could be used in a wide variety of actual applications where detection of trace amounts is necessary.
我们介绍了一种简单且具有成本效益的方法，用于制造有效的表面增强拉曼光谱（SERS）基底。结果表明，所制造的基底在各种探针分子中表现出优异的 SERS 效应，具有高灵敏度，即皮摩尔级别的检测，并且还具有良好的可靠性。该 SERS 基底的增强因子超过 10，信号强度的重现性（偏差小于 5%）非常好，在四英寸晶圆上实现了 SERS 基底的制造，并已证明在农药残留检测中有效。该 SERS 基底首先通过使用超对齐碳纳米管网络作为刻蚀掩模来制造具有数十纳米尺寸特征的准周期纳米结构硅来实现，之后通过沉积金膜形成大量具有纳米间隙的热点。通过严格的纳米结构设计，优化了纳米结构的电磁场分布增强性能。由于具有成本效益的大面积制备优势，相信所制造的 SERS 基底可以用于各种需要痕量检测的实际应用中。
