Fabrication of 3D wax/silica/Ag(Au) colloidosomes as surface-enhanced Raman spectroscopy substrates based on Pickering emulsion and seed-mediated growth method of noble metal nanoparticles

Noble metal (Ag, Au) nanoparticles (NPs) deposited on the surface of three-dimensional (3D) materials are promising 3D surface-enhanced Raman spectroscopy (SERS) substrates. In this work, the authors reported the preparation of 3D wax/silica/Ag(Au) colloidosomes by sulfonic acid group–terminated sil...

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Bibliographic Details
Published in:Journal of materials research 2019-06, Vol.34 (12), p.2137-2145
Main Authors: Wang, Ke, Feng, Lihua, Li, Xiyong, Wang, Wenqin
Format: Article
Language:English
Subjects:
Acids
Applied and Technical Physics
Biomaterials
Colloids
Droplets
Fourier transforms
Gold
Graphene
Inorganic Chemistry
Materials Engineering
Materials research
Materials Science
Morphology
Nanoparticles
Nanotechnology
Noble metals
Raman spectroscopy
Seeds
Silicon dioxide
Silver
Spectrum analysis
Spheres
Substrates
Sulfonic acid
Surfactants
Synthesis and Processing of Metals
Waxes
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Summary:Noble metal (Ag, Au) nanoparticles (NPs) deposited on the surface of three-dimensional (3D) materials are promising 3D surface-enhanced Raman spectroscopy (SERS) substrates. In this work, the authors reported the preparation of 3D wax/silica/Ag(Au) colloidosomes by sulfonic acid group–terminated silica spheres (SiO2–SO3H) combined with a Pickering emulsion technique, as well as seed-mediated growth method of noble metal NPs. The presence of –SO3H group on the silica spheres not only improves significantly the quality of wax/silica colloidosomes (forming perfect silica shell around wax droplet) but also can adsorb metal precursor ions via electrostatic attraction for further growth of metal NPs. The size and coverage of Ag(Au) NPs on wax/silica droplets can be facilely tuned, and relevant wax/silica/Ag(Au) colloidosomes and silica/Ag(Au) Janus particles are obtained via this strategy. The obtained wax/silica/Ag colloidosomes as 3D SERS substrates exhibited excellent SERS enhancement ability and detection limit of 4-aminothiophenol reached 10−9 M.
ISSN:0884-2914
2044-5326
DOI:10.1557/jmr.2019.116