Assembly of Gold Nanostructured Films Templated by Colloidal Crystals and Use in Surface-Enhanced Raman Spectroscopy

Tessier, Peter M.; Velev, Orlin D.; Kalambur, Anand T.; Rabolt, John F.; Lenhoff, Abraham M.; Kaler, Eric W.

doi:10.1021/ja0022831

Cited by 333 publications

(216 citation statements)

References 30 publications

(26 reference statements)

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“…The closest example in the literature to the work reported here is that of Tessier et al [24] and Dick et al [7]. Tessier et al prepared inverse gold opals by the co-deposition of 25 nm gold particles and 630 nm latex microspheres to produce thick multilayer samples which they used as a SERS substrate.…”

Section: Resultsmentioning

confidence: 79%

Electrochemical SERS at a structured gold surface

Abdelsalam

Bartlett

Baumberg

et al. 2005

Electrochemistry Communications

172

149

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Templated electrodeposition of gold to produce thin (<1 lm) films containing a close packed hexagonal array of uniform sphere segment voids is shown to give surfaces which show strong surface enhancement for Raman scattering from molecules adsorbed at the surface. The magnitude of this is enhancement is determined by the precise geometry of the surface and depends on the choice of void diameter and film thickness. The resulting SER active surfaces are stable, reusable, give reproducible surface enhancement and can be used for in situ electrochemical SERS studies.

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Section: Resultsmentioning

confidence: 79%

Electrochemical SERS at a structured gold surface

Abdelsalam

Bartlett

Baumberg

et al. 2005

Electrochemistry Communications

172

149

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“…Figure 8D shows a typical HRTEM image, displaying lattice fringes over the entire particle with no clear void. Although ~80% of the particles exhibited an increase in dimension as compared to the initial Ag MTPs, a few small fragments of broken particles with size ranging from 2 to 5 nm were present in the sample, similar to the collapsed hollow structures when oleylamine-capped Ag MTPss were reacted with 3.1 mL of 0.5 mM HAuCl 4 . This result indicates that the reaction between HAuCl 4 and Ag probably only occurred on a limited number of the oleic acid-capped particles, where the surface was not entirely covered.…”

Section: The Effect Of Capping Ligand On the Galvanic Replacement Reamentioning

confidence: 83%

“…A mixture of nanorings and nanocages was always observed in the samples of hollow particles. By counting the number of identifiable nanorings and nanocages, the ratios of nanoring to nanocage were recorded for the particles obtained at different molar ratios of HAuCl 4 to Ag. At all reaction stages, the maximum ratio of nanoring to nanocage derived from the 11-nm Ag MTPs was 2:1, while this maximum ratio decreased to ~1:3 for the 14-nm Ag nanoparticles.…”

Section: Reaction Mechanismmentioning

confidence: 99%

Mechanistic Studies on the Galvanic Replacement Reaction between Multiply Twinned Particles of Ag and HAuCl₄ in an Organic Medium

et al. 2007

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This article presents a mechanistic study on the galvanic replacement reaction between 11-and 14-nm multiply twinned particles (MTPs) of Ag and HAuCl 4 in chloroform. We monitored both morphological and spectral changes as the molar ratio of HAuCl 4 to Ag was increased. The details of reaction were different from previous observations on single-crystal Ag nanocubes and cubooctahedrons. Because Au and Ag form alloys rapidly within small MTPs rich in vacancy and grain boundary defects, a complete Au shell did not form on the surface of each individual Ag template. Instead, the replacement reaction resulted in the formation of alloy nanorings and nanocages from Ag MTPs of decahedral or icosahedral shape. For the nanorings and nanocages derived from 11-nm Ag MTPs, the surface plasmon resonance (SPR) peak can be continuously shifted from 400 to 616 nm. When the size of Ag MTPs was increased to 14 nm, the SPR peak can be further shifted to 740 nm, a wavelength sought by biomedical applications. We have also investigated the effects of capping ligands and AgCl precipitate on the replacement reaction. While hollow structures were routinely generated from oleylamine-capped Ag MTPs, we obtained very few hollow structures by using a stronger capping ligand such as oleic acid or tri-n-octylphosphine oxide (TOPO). Addition of extra oleylamine was found to be critical to the formation of well-controlled, uniform hollow structures free of AgCl contamination thanks to the formation of a soluble complex between AgCl and oleylamine.

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“…8 There are two main approaches to obtain patterned surfaces: top-down and bottom-up methods. 9 The top-down techniques refer to physical or combined physicalchemical modification of a surface; well-known examples are photolithography, 10,11 soft lithography, [12][13][14] electron beam lithography 15 or etching.…”

Section: Introductionmentioning

confidence: 99%

Surface-induced assembly of sophorolipids

Peyre

Hamraoui

Faustini

et al. 2017

Phys. Chem. Chem. Phys.

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The surface self-assembly properties of acidic sophorolipids, a bolaform microbial glycolipids with pHresponsive properties in solution, were studied based on the chemical nature of the support and pH of the solution. Sophorolipids generally form micelles in water but formation of morphologies like platelets and twisted fibers depending on pH have also been reported. The surface self-assembly was achieved using dip-coating on three different substrates namely gold, silicon(111) and TiO 2 anatase. Deposition conditions (dip-coating withdrawal speed, relative humidity, temperature) were tested, and it was found that optimum self-assembly occurred at a withdrawal speed of 1 mm s À1 , T of 25 1C and relative humidity of 25%. The local structure of the sophorolipid films was characterized by Atomic Force Microscopy, while Scanning Electron Microscopy was used to characterize the spatial homogeneity. We also attempted to correlate dispersive, electron donor and electron attractor surface energy components, using Good-Van Oss's approach, and the behavior of sophorolipids. We found that when the surface energy is dominated by dispersive components, sophorolipids spontaneously assemble into entangled needles at all pH values (4, 6 and 11). However, when the surface energy is dominated by electronic components, pH has a strong influence on the surface self-assembly. We could discriminate three major organizations: homogeneous layer, isolated aggregates and a two-dimensional network similar to block copolymer surface self-assembly.

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Assembly of Gold Nanostructured Films Templated by Colloidal Crystals and Use in Surface-Enhanced Raman Spectroscopy

Cited by 333 publications

References 30 publications

Electrochemical SERS at a structured gold surface

Electrochemical SERS at a structured gold surface

Mechanistic Studies on the Galvanic Replacement Reaction between Multiply Twinned Particles of Ag and HAuCl₄ in an Organic Medium

Surface-induced assembly of sophorolipids

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Assembly of Gold Nanostructured Films Templated by Colloidal Crystals and Use in Surface-Enhanced Raman Spectroscopy

Cited by 333 publications

References 30 publications

Electrochemical SERS at a structured gold surface

Electrochemical SERS at a structured gold surface

Mechanistic Studies on the Galvanic Replacement Reaction between Multiply Twinned Particles of Ag and HAuCl4 in an Organic Medium

Surface-induced assembly of sophorolipids

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Product

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Mechanistic Studies on the Galvanic Replacement Reaction between Multiply Twinned Particles of Ag and HAuCl₄ in an Organic Medium