Journal ArticleDOI
A chemical route to increase hot spots on silver nanowires for surface-enhanced Raman spectroscopy application.
Madeline Shuhua Goh,Yih Hong Lee,Srikanth Pedireddy,In Yee Phang,Weng Weei Tjiu,Joel Min Rui Tan,Xing Yi Ling +6 more
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TLDR
Mapping of single-nanowire SERS measurements showed that the chemical etching method has overcome the limitation of conventional one-dimensional Ag nanowires with limited SERS active area at the tips to produce etched Ag nanoweires with an increase in Raman hot spots and polarization-independent SERS signals across tens of micrometers length scale.Abstract:
The effective number of surface-enhanced Raman spectroscopy (SERS) active hot spots on plasmonic nanostructures is the most crucial factor in ensuring high sensitivity in SERS sensing platform. Here we demonstrate a chemical etching method to increase the surface roughness of one-dimensional Ag nanowires, targeted at creating more SERS active hot spots along Ag nanowire’s longitudinal axis for increased SERS detection sensitivity. Silver nanowires were first synthesized by the conventional polyol method and then subjected to chemical etching by NH4OH and H2O2 mixture. The surfaces of silver nanowires were anisotropically etched off to create miniature “beads on a string” features with increased surface roughness while their crystallinity was preserved. Mapping of single-nanowire SERS measurements showed that the chemical etching method has overcome the limitation of conventional one-dimensional Ag nanowires with limited SERS active area at the tips to produce etched Ag nanowires with an increase in Raman ...read more
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Designing surface-enhanced Raman scattering (SERS) platforms beyond hotspot engineering: emerging opportunities in analyte manipulations and hybrid materials.
Hiang Kwee Lee,Yih Hong Lee,Charlynn Sher Lin Koh,Gia Chuong Phan-Quang,Xuemei Han,Chee Leng Lay,Chee Leng Lay,Howard Yi Fan Sim,Ya-Chuan Kao,Qi An,Qi An,Xing Yi Ling +11 more
TL;DR: Five major approaches to enhance SERS performance are outlined and can be integrated with engineered hotspots as a multifaceted strategy to further boost SERS sensitivities that are unachievable using hotspot engineering alone.
Journal ArticleDOI
Encoding molecular information in plasmonic nanostructures for anti-counterfeiting applications
TL;DR: The polarization-dependent SERS intensity, molecular fingerprint of SERS spectra, and versatile geometrical design by two-photon lithography have made the plasmonic Ag nanowire structures an ideal candidate as advanced security solutions for anti-counterfeiting application.
Journal ArticleDOI
Hybrid nanostructures for SERS: materials development and chemical detection
TL;DR: In this article, a review focusing on recent developments in hybrid and nanostructured substrates for SERS (surface-enhanced Raman scattering) studies is presented, including polymer nanocomposites containing metal nanoparticles and coupled inorganic nanophases.
Journal ArticleDOI
Layer-by-layer assembly of Ag nanowires into 3D woodpile-like structures to achieve high density "hot spots" for surface-enhanced Raman scattering
TL;DR: The assembled multilayered silver nanowires demonstrate a larger SERS depth cross section and angle-independent SERS intensity, making such woodpile 3D SERS substrate more reliable and versatile for future sensing applications.
Journal ArticleDOI
Superhydrophobic Surface-Enhanced Raman Scattering Platform Fabricated by Assembly of Ag Nanocubes for Trace Molecular Sensing
TL;DR: The protocol is a general method that provides a simple, cost-effective approach to develop a stable and uniform superhydrophobic SERS platform for trace molecular sensing.
References
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Probing Single Molecules and Single Nanoparticles by Surface-Enhanced Raman Scattering
Shuming Nie,Steven R. Emory +1 more
TL;DR: In this article, surface-enhanced Raman scattering was used to detect single molecules and single nanoparticles at room temperature with the use of surface enhanced Raman, and the intrinsic Raman enhancement factors were on the order of 10 14 to 10 15, much larger than the ensemble-averaged values derived from conventional measurements.
Journal ArticleDOI
The Optical Properties of Metal Nanoparticles: The Influence of Size, Shape, and Dielectric Environment
TL;DR: In this paper, the authors describe recent progress in the theory of nanoparticle optical properties, particularly methods for solving Maxwell's equations for light scattering from particles of arbitrary shape in a complex environment.
Journal ArticleDOI
Single Molecule Detection Using Surface-Enhanced Raman Scattering (SERS)
Katrin Kneipp,Katrin Kneipp,Yang Wang,Yang Wang,Harald Kneipp,Harald Kneipp,Lev T. Perelman,Lev T. Perelman,Irving Itzkan,Irving Itzkan,Ramachandra R. Dasari,Ramachandra R. Dasari,Michael S. Feld,Michael S. Feld +13 more
TL;DR: In this article, the first observation of single molecule Raman scattering was made using a single crystal violet molecule in aqueous colloidal silver solution using one second collection time and about $2.
Journal ArticleDOI
Localized Surface Plasmon Resonance Spectroscopy and Sensing
TL;DR: This review describes recent fundamental spectroscopic studies that reveal key relationships governing the LSPR spectral location and its sensitivity to the local environment, including nanoparticle shape and size and introduces a new form of L SPR spectroscopy, involving the coupling between nanoparticle plasmon resonances and adsorbate molecular resonances.
Journal ArticleDOI
Anisotropic metal nanoparticles: Synthesis, assembly, and optical applications
Catherine J. Murphy,Tapan K. Sau,Anand Gole,Christopher J. Orendorff,Jinxin Gao,Linfeng Gou,Simona E. Hunyadi,Tan Li +7 more
TL;DR: Variations in reaction conditions and crystallographic analysis of gold nanorod have led to insight into the growth mechanism of these materials, and optical applications in sensing and imaging, which take advantage of the visible light absorption and scattering properties of the nanorods are discussed.