@article{Shen2015, 
author = {Jianlei Shen and Jing Su and Juan Yan and Bin Zhao and Dongfang Wang and Siyi Wang and Kun Li and Mengmeng Liu and Yao He and Sanjay Mathur and Chunhai Fan and Shiping Song},
title = {Bimetallic nano-mushrooms with DNA-mediated interior nanogaps for high-efficiency SERS signal amplification},
year = {2015},
journal = {Nano Research},
volume = {8},
number = {3},
pages = {731-742},
keywords = {surface-enhanced Raman scattering, biometallic nanostructure, nano-mushroom, nanogap, gold nanoparticle},
url = {https://www.sciopen.com/article/10.1007/s12274-014-0556-2},
doi = {10.1007/s12274-014-0556-2},
abstract = {Uniform silver-containing metal nanostructures with well-defined nanogaps hold great promise for ultrasensitive surface-enhanced Raman scattering (SERS) analyses. Nevertheless, the direct synthesis of such nanostructures with strong and stable SERS signals remains extremely challenging. Here, we report a DNA-mediated approach for the direct synthesis of gold-silver nano-mushrooms with interior nanogaps. The SERS intensities of these nano-mushrooms were critically dependent on the area of the nanogap between the gold head and the silver cap. We found that the formation of nanogaps was finely tunable by controlling the surface density of 6-carboxy-X-rhodamine (ROX) labeled single-stranded DNA (ssDNA) on the gold nanoparticles. We obtained nano-mushrooms in high yield with a high SERS signal enhancement factor of ~1.0 × 109, much higher than that for Au-Ag nanostructures without nanogaps. Measurements for single nanomushrooms show that these structures have both sensitive and reproducible SERS signals.}
}