Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371, Singapore.
ACS Appl Mater Interfaces. 2012 Apr;4(4):2180-5. doi: 10.1021/am300189n. Epub 2012 Apr 5.
Ordered array of Au semishells on TiO(2) spheres with controlled size are prepared by combining the nanosphere self-assembly and atomic layer deposition (ALD). This ordered 2-D structure with designed array of metal nanogaps can be used as an ultrasensitive surface-enhanced Raman scattering (SERS) substrate with high reproducibility and stability. More importantly, the SERS substrates are recyclable, as enabled by their self-cleaning function due to the TiO(2) photocatalytic degradation of the target molecules. The high SERS sensitivity and recyclability are demonstrated by the detection of Rhodamine 6G (R6G) and brilliant cresyl blue (BCB) molecules. As both the nanosphere lithography and ALD are scalable processes, such 2-D ordered substrates may find applications in chemical sensing.
通过将纳米球自组装和原子层沉积（ALD）相结合，制备了具有受控尺寸的 TiO2 球上 Au 半壳有序排列。这种具有设计金属纳米间隙二维有序结构的材料可以用作超灵敏表面增强拉曼散射（SERS）基底，具有高重复性和稳定性。更重要的是，由于 TiO2 的光催化降解作用，这些 SERS 基底具有自清洁功能，因此是可回收的。Rhodamine 6G（R6G）和 brilliant cresyl blue（BCB）分子的检测证明了其具有高的 SERS 灵敏度和可回收性。由于纳米球光刻和 ALD 都是可扩展的工艺，因此这种二维有序基底可能在化学传感中有应用。
