Universität zu Köln

Shen, Jianlei, Su, Jing, Yan, Juan, Zhao, Bin, Wang, Dongfang, Wang, Siyi, Li, Kun ORCID: 0000-0001-9399-9498, Liu, Mengmeng, He, Yao, Mathur, Sanjay, Fan, Chunhai ORCID: 0000-0002-7171-7338 and Song, Shiping (2015). Bimetallic nano-mushrooms with DNA-mediated interior nanogaps for high-efficiency SERS signal amplification. Nano Res., 8 (3). S. 731 - 743. BEIJING: TSINGHUA UNIV PRESS. ISSN 1998-0000

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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 similar to 1.0 x 10(9), much higher than that for Au-Ag nanostructures without nanogaps. Measurements for single nano-mushrooms show that these structures have both sensitive and reproducible SERS signals.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Shen, Jianlei UNSPECIFIED UNSPECIFIED UNSPECIFIED Su, Jing UNSPECIFIED UNSPECIFIED UNSPECIFIED Yan, Juan UNSPECIFIED UNSPECIFIED UNSPECIFIED Zhao, Bin UNSPECIFIED UNSPECIFIED UNSPECIFIED Wang, Dongfang UNSPECIFIED UNSPECIFIED UNSPECIFIED Wang, Siyi UNSPECIFIED UNSPECIFIED UNSPECIFIED Li, Kun UNSPECIFIED orcid.org/0000-0001-9399-9498 UNSPECIFIED Liu, Mengmeng UNSPECIFIED UNSPECIFIED UNSPECIFIED He, Yao UNSPECIFIED UNSPECIFIED UNSPECIFIED Mathur, Sanjay UNSPECIFIED UNSPECIFIED UNSPECIFIED Fan, Chunhai UNSPECIFIED orcid.org/0000-0002-7171-7338 UNSPECIFIED Song, Shiping UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-411898
DOI:	10.1007/s12274-014-0556-2
Journal or Publication Title:	Nano Res.
Volume:	8
Number:	3
Page Range:	S. 731 - 743
Date:	2015
Publisher:	TSINGHUA UNIV PRESS
Place of Publication:	BEIJING
ISSN:	1998-0000
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Inorganic Chemistry
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ENHANCED RAMAN-SCATTERING; SINGLE-MOLECULE; SURFACE; NANOPARTICLES; NANOSTRUCTURES; OLIGONUCLEOTIDES; SPECTROSCOPY; RANGE Multiple languages Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/41189