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

Jianlei Shen; Jing Su; Juan Yan; Bin Zhao; Dongfang Wang; Siyi Wang; Kun Li; Mengmeng Liu; Yao He; Sanjay Mathur; Chunhai Fan; Shiping Song

doi:10.1007/s12274-014-0556-2

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

Jianlei Shen, Jing Su, Juan Yan, Bin Zhao, Dongfang Wang, Siyi Wang, Kun Li, Mengmeng Liu, Yao He, Sanjay Mathur, Chunhai Fan, Shiping Song

Research output: Contribution to journal › Article › peer-review

72 Scopus citations

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.

[Figure not available: see fulltext.]

Original language	English
Pages (from-to)	731-742
Number of pages	12
Journal	Nano Research
Volume	8
Issue number	3
DOIs	https://doi.org/10.1007/s12274-014-0556-2
State	Published - Mar 2015
Externally published	Yes

Keywords

biometallic nanostructure
gold nanoparticle
nano-mushroom
nanogap
surface-enhanced Raman scattering

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10.1007/s12274-014-0556-2

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@article{38de7b55c5c3434bb51b1caa7e0c0f7b,

title = "Bimetallic nano-mushrooms with DNA-mediated interior nanogaps for high-efficiency SERS signal amplification",

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.[Figure not available: see fulltext.]",

keywords = "biometallic nanostructure, gold nanoparticle, nano-mushroom, nanogap, surface-enhanced Raman scattering",

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",

note = "Publisher Copyright: {\textcopyright} 2015, Tsinghua University Press and Springer-Verlag Berlin Heidelberg.",

year = "2015",

month = mar,

doi = "10.1007/s12274-014-0556-2",

language = "英语",

volume = "8",

pages = "731--742",

journal = "Nano Research",

issn = "1998-0124",

publisher = "Tsinghua University Press",

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TY - JOUR

T1 - Bimetallic nano-mushrooms with DNA-mediated interior nanogaps for high-efficiency SERS signal amplification

AU - Shen, Jianlei

AU - Su, Jing

AU - Yan, Juan

AU - Zhao, Bin

AU - Wang, Dongfang

AU - Wang, Siyi

AU - Li, Kun

AU - Liu, Mengmeng

AU - He, Yao

AU - Mathur, Sanjay

AU - Fan, Chunhai

AU - Song, Shiping

PY - 2015/3

Y1 - 2015/3

N2 - 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.[Figure not available: see fulltext.]

AB - 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.[Figure not available: see fulltext.]

KW - biometallic nanostructure

KW - gold nanoparticle

KW - nano-mushroom

KW - nanogap

KW - surface-enhanced Raman scattering

UR - https://www.scopus.com/pages/publications/84924767799

U2 - 10.1007/s12274-014-0556-2

DO - 10.1007/s12274-014-0556-2

M3 - 文章

AN - SCOPUS:84924767799

SN - 1998-0124

VL - 8

SP - 731

EP - 742

JO - Nano Research

JF - Nano Research

IS - 3

ER -

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

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Keywords

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