effective three-dimensional surface-enhanced Raman scattering substrate based on oblique Si nanowire arrays decorated with Ag nanoparticles

Silicon nanowire arrays (SiNWAs) decorated with metallic nanoparticle heterostructures feature promising applications in surface-enhanced Raman scattering (SERS). However, the densely arranged SiNWAs are usually inconvenient for the following decoration of metallic nanoparticles, and only the top ar...

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Bibliographic Details
Published in:Journal of materials science 2016-04, Vol.51 (8), p.3854-3860
Main Authors: He, Lifang, Ai, Chengying, Wang, Wenbao, Gao, Ning, Yao, Xiaolin, Tian, Chao, Zhang, Kui
Format: Article
Language:English
Subjects:
adsorption
Arrays
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Crystallography and Scattering Methods
Decoration
detection limit
DNA
Heterostructures
Magnetron sputtering
Materials Science
Nanoparticles
nanosilver
Nanowires
Organic chemistry
Original Paper
Polymer Sciences
Raman scattering
Raman spectra
Raman spectroscopy
Rhodamine 6G
silicon
Silicon substrates
Silver
Solid Mechanics
Substrates
surface area
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Summary:Silicon nanowire arrays (SiNWAs) decorated with metallic nanoparticle heterostructures feature promising applications in surface-enhanced Raman scattering (SERS). However, the densely arranged SiNWAs are usually inconvenient for the following decoration of metallic nanoparticles, and only the top area of silicon nanowires (SiNWs) contributes to the SERS detection. To improve the utilization of the heterostructure, herein, oblique SiNWAs were grown separately, and Ag nanoparticles (AgNPs) were uniformly deposited by magnetron sputtering to get the three-dimensional (3D) SiNWAs decorated with AgNPs (AgNPs-SiNWAs) SERS substrate. The large open surfaces of oblique SiNWs would create more surface area available for the formation of hotspots and improve the adsorption and excitation of analyte molecules on the wire. The optimized AgNPs-SiNWAs substrate exhibits high sensitivity in detecting chemical molecule Rhodamine 6G, and the detection limit can reach 1 × 10⁻¹⁰ M. More importantly, the substrate also can be used as an effective DNA sensor for label-free DNA detection.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-015-9704-7