Abstract
In recent years, surface-enhanced Raman scattering (SERS) has received renewed attention, because of its nondestructive, ultrasensitive, and rapid analysis, detection, and imaging. Development of SERS substrates with high sensitivity and excellent stability is of great importance to realize its practical applications in trace analysis, bio diagnosis, and in vivo studies. In this work, we demonstrate wafer-scale Ag-nanoparticle-decorated, obviously angular, quasi-vertically aligned cuboid-shaped TiO2 nanowire arrays (TiO2-NWs), as ultrasensitive and uniform 3D SERS substrates. A detection limit of 10–15 M rhodamine 6G molecules and an analytical enhancement factor of 1012 were achieved on the cuboid-shaped TiO2-NWs arrays with 9 min Ag-sputtering. This is the best result obtained among the literature values on Ag-modified semiconductor SERS substrates. More importantly, the optimized TiO2-Ag also exhibits excellent stability and uniformity. The excellent SERS performance is attributed to the “cusp” and “ga...
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