Abstract
A method for sensing trace lead ion (Pb2+) in water based on an ultrasensitive surface-enhanced Raman scattering sensor is developed. Silicon nanowire arrays were first grown, followed by the deposition of gold nanoparticles on the surface to form Au@SiNWAs substrate with an enhanced factor of ∼5.96 × 105. Au@SiNWAs was modified with crystal violet, and the lowest detectable concentration of Pb2+ was about 10−13 M level. There was no obvious interference when other metal ions were present, demonstrating the excellent selectivity for Pb2+. The sensor is simple to prepare, and can be used repeatedly.
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