NDLI: Bimetallic nano-mushrooms with DNA-mediated interior nanogaps for high-efficiency SERS signal amplification

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Bimetallic nano-mushrooms with DNA-mediated interior nanogaps for high-efficiency SERS signal amplification

Content Provider	Semantic Scholar
Author	Shen, Jianlei Su, Jing Yan, Juan Zhao, Bin Wang, Dongfang Wang, Siyi Liu, Mengmeng Mathur, Sanjay Bansi Fan, Chunhai Song, Shiping
Copyright Year	2014
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.
Starting Page	731
Ending Page	742
Page Count	12
File Format	PDF HTM / HTML
DOI	10.1007/s12274-014-0556-2
Alternate Webpage(s)	https://page-one.springer.com/pdf/preview/10.1007/s12274-014-0556-2
Alternate Webpage(s)	http://www.thenanoresearch.com/upload/justPDF/0556.pdf
Alternate Webpage(s)	https://static-content.springer.com/esm/art:10.1007%2Fs12274-014-0556-2/MediaObjects/12274_2014_556_MOESM1_ESM.pdf
Alternate Webpage(s)	https://doi.org/10.1007/s12274-014-0556-2
Volume Number	8
Journal	Nano Research
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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