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This paper reports the synthesis of a new type of Au@TiO 2  yolk–shell nanostructures by integrating ion sputtering method with atomic layer deposition (ALD) technique and its applications as visible light-driven photocatalyst and surface-enhanced Raman spectroscopy (SERS) substrate. Both the size and amount of gold nanoparticles confined in TiO 2  nanotubes could be facilely controlled via properly adjusting the sputtering time. The unique structure and morphology of the resulting Au@TiO 2  samples were investigated by using various spectroscopic and microscopic techniques in detail. It is found that all tested samples can absorb visible light with a maximum absorption at localized surface plasmon resonance (LSPR) wavelengths (550–590 nm) which are determined by the size of gold nanoparticles. The Au@TiO 2  yolk–shell composites were used as the photocatalyst for the degradation of methylene blue (MB). As compared with pure TiO 2  nanotubes, Au@TiO 2  composites exhibit improved photocatalytic properties towards the degradation of MB. The SERS effect of Au@TiO 2  yolk–shell composites was also performed to investigate the detection sensitivity of MB.   Electronic supplementary material  The online version of this article (10.1186/s11671-017-2313-4) contains supplementary material, which is available to authorized users.

The Preparation of Au@TiO2 Yolk–Shell Nanostructure and its Applications for Degradation and Detection of Methylene Blue