Self‐Assembled Au Nanoparticles as Substrates for Surface‐Enhanced Vibrational Spectroscopy: Optimization and Electrochemical Stability

Fan, Meikun; Brolo, Alexandre G.

doi:10.1002/cphc.200800099

Cited by 42 publications

(54 citation statements)

References 57 publications

(83 reference statements)

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“…So far, many nanostructured metal materials have been tested as SERS substrates. [1][2][3][4][5][6][7][8][9][10][11][12] It has been shown that the SERS enhancement factor depends on the size, morphology, and assembly of the nanoparticles. The ability to prepare a nanostructured array with controlled particle size and interparticle distance would allow one to control the resonance frequency of the localized surface plasmon and to opportunely match it with the incident laser wavelength, resulting in larger SERS enhancements.…”

Section: Introductionmentioning

confidence: 99%

Dealloying Ag–Al Alloy to Prepare Nanoporous Silver as a Substrate for Surface‐Enhanced Raman Scattering: Effects of Structural Evolution and Surface Modification

et al. 2011

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Sensitive detection of molecules by using the surface-enhanced Raman scattering (SERS) technique depends on the nanostructured metallic substrate and many efforts have been devoted to the preparation of SERS substrates with high sensitivity, stability, and reproducibility. Herein, we report on the fabrication of stable monolithic nanoporous silver (NPS) by chemical dealloying of Ag-Al precursor alloys with an emphasis on the effect of structural evolution on SERS signals. It was found that the dealloying conditions had great influence on the morphology (the ligament/pore size) and the crystallization status, which determined the SERS signal of rhodamine 6G on the NPS. NPS with small pores, low residual Al, and perfect crystallization gave high SERS signals. A high enhancement factor of 7.5 × 10(5) was observed on bare NPS obtained by dealloying Ag(30)Al(70) in 2.5 wt % HCl at room temperature followed by 15 min aging at around 85 °C. After coating Ag nanoparticles on the NPS surface, the enhancement factor increased to 1.6 × 10(8) owing to strong near-field coupling between the ligaments and nanoparticles.

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Section: Introductionmentioning

confidence: 99%

Dealloying Ag–Al Alloy to Prepare Nanoporous Silver as a Substrate for Surface‐Enhanced Raman Scattering: Effects of Structural Evolution and Surface Modification

et al. 2011

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“…Different surface sensitive characterization techniques were used to evaluate the functionalized surfaces including PM-IRRAS which was used to monitor the adsorption and organization of the monolayer, similarly to recent work in the literature. [28][29][30] The motivation is to reduce the electrochemical signal from gold, avoiding fouling surfaces and thus lead to functionalized surfaces amenable to adsorption of biomolecules for efficient SPR based biosensors.…”

Section: Introductionmentioning

confidence: 99%

Probing the Functionalization of Gold Surfaces and Protein Adsorption by PM‐IRRAS

et al. 2011

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The control of morphology and coating of metal surfaces is essential for a number of organic electronic devices including photovoltaic cells and sensors. In this study, we monitor the functionalization of gold surfaces with 11-mercaptoundecanoic acid (MUA, HS(CH(2) )(10) CO(2) H) and cysteamine, aiming at passivating the surfaces for application in surface plasmon resonance (SPR) biosensors. Using polarization-modulated infrared reflection-absorption spectroscopy (PM-IRRAS), cyclic voltammetry, atomic force microscopy and quartz crystal microbalance, we observed a time-dependent organization process of the adsorbed MUA monolayer with alkyl chains perpendicular to the gold surface. Such optimized condition for surface passivation was obtained with a systematic search for experimental parameters leading to the lowest electrochemical signal of the functionalized gold electrode. The ability to build supramolecular architectures was also confirmed by detecting with PM-IRRAS the adsorption of streptavidin on the MUA-functionalized gold. As the approaches used for surface functionalization and its verification with PM-IRRAS are generic, one may now envisage monitoring the fabrication of tailored electrodes for a variety of applications.

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“…The scattering cross section and the electric field around the particle can reach very high values in the spectral vicinity of the surface plasmon resonances. Hence, metal nanoparticles find additional applications in the enhancement of field-sensitive optical processes, in, for example, fluorescence enhancement (Käll et al 2005;Härtling et al 2007) and surface-enhanced Raman spectroscopy (Otto et al 1992;Freeman et al 1995;Grabar et al 1995;Kneipp et al 1997;Lu et al 2005aLu et al ,b, 2006Qin et al 2006;Fan & Brolo 2008;Ko et al 2008;Lu & Eychmüller 2008), as well as in environmental refractive index sensing (Raschke et al 2003;Härtling & Eng 2005).…”

Section: Introductionmentioning

confidence: 99%

Synthesis of noble metal nanoparticles and their non-ordered superstructures

Bigall

Eychmüller

2010

Phil. Trans. R. Soc. A.

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This article highlights our recent work concerning the synthesis of metal nanoparticles and their non-ordered superstructures. After a short introduction, the basic synthetic procedures are explained for the nanoparticles used for the assemblies. Furthermore, a fabrication method is itemized for very monodisperse platinum nanoparticles in aqueous solution ranging in diameter from 10 to 100 nm showing distinct optical properties. The next section deals with the synthesis of non-ordered hydro-and aerogels from the asprepared sols. Very light large surface materials from gold, silver, platinum and goldsilver and platinum-silver sols can be fabricated with the given method. Another way to ultralight superstructures of noble metal nanoparticles using fungi as templates is described in the third section. Although fungi grow inside the colloidal solutions they can assemble the nanoparticles onto their surfaces. These hybrid systems are thus extremely interesting supported superstructures for applications in heterogeneous catalysis, since the numbers of nanoparticles on the fungus can easily be tuned, and the fabrication process is cost-effective, environmentally friendly and the organic templates can be easily removed by simple combustion for regaining the noble metal.

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Self‐Assembled Au Nanoparticles as Substrates for Surface‐Enhanced Vibrational Spectroscopy: Optimization and Electrochemical Stability

Cited by 42 publications

References 57 publications

Dealloying Ag–Al Alloy to Prepare Nanoporous Silver as a Substrate for Surface‐Enhanced Raman Scattering: Effects of Structural Evolution and Surface Modification

Dealloying Ag–Al Alloy to Prepare Nanoporous Silver as a Substrate for Surface‐Enhanced Raman Scattering: Effects of Structural Evolution and Surface Modification

Probing the Functionalization of Gold Surfaces and Protein Adsorption by PM‐IRRAS

Synthesis of noble metal nanoparticles and their non-ordered superstructures

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