Huge SERS enhancement via ZnO nanowires on gold nanoislands

摘要

We experimentally investigated Zinc oxide (ZnO) nanowires (NWs) on flat Si substrate and ZnO NWs on Aunanoislands attached on a Si substrate via hydrothermal technique, pursuing surface enhanced Raman scattering (SERS).Au nanoislands were formed by thermal annealing of a Au thin film deposited on Si substrate. ZnO NWs were thengrown on two types of substrates (with and without Au nanoislands) and thermally annealed together. During the thermalannealing process, the ZnO NWs were coupled to Au nanoislands. After the thermal annealing, strong SERSenhancement was observed of ZnO NWs on Au nanoislands. Over 30 times enhancement in SERS was found when theinitial Au layer thickness was 40 nm.© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.