Enhanced Raman scattering from liquid metal films formed from silver sols

Gordon, Keith C.; McGarvey, John J.; Taylor, Kate

doi:10.1021/j100355a046

Cited by 53 publications

(59 citation statements)

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“…To avoid assembly at the solid interface, which generally requires chemical treatment prior to assembly 29 , NP films formed at the interface between two immiscible phases, such as a liquid-liquid interface (LLI) or liquid-air interface (LAI), can be used 30,31 . The interfacial tension between such phases is reduced by the adsorption of NPs 32 which ultimately stabilizes the assembly 33,34 .…”

Section: Introductionmentioning

confidence: 99%

Self-assembled nanoparticle arrays for multiphase trace analyte detection

et al. 2012

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Nanoplasmonic structures designed for trace analyte detection by surface enhanced Raman spectroscopy typically require sophisticated nanofabrication techniques. An alternative to fabricating such arrays is to rely on self-assembly of nanoparticles at liquid-liquid or liquid-air interfaces into close-packed arrays.The density of the arrays can be fine tuned by modifying the nanoparticle functionality, pH of the solution, and salt concentration. Importantly, these arrays are robust, "self-healing", reproducible, and extremely easy to handle. Herein, we report on the use of such platforms made of Au nanoparticles for detection of (multi)analytes from the aqueous, organic, or air phases. The total interfacial area of the Au array, at the liquid-liquid interface, is approximately 25 mm 2 , making this platform ideal for small volume samples, low concentrations, and trace analytes. Importantly, the ease of assembly and rapid 2 detection makes this platform ideal for in-field sample testing of toxins such as explosives, drugs, or other hazardous chemicals.3

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Section: Introductionmentioning

confidence: 99%

Self-assembled nanoparticle arrays for multiphase trace analyte detection

et al. 2012

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“…[22,23] The films have remarkable properties, they typically have a highly reflective metallic appearance, despite being just one nanoparticle layer thick, can self-heal if damaged and provide very strong SERS enhancements. They can be prepared by shaking an aqueous metal colloid with an immiscible non-aqueous solvent containing "modifier" compound which was originally believed to adsorb to the particles, increasing their hydrophobicity.…”

Section: Characterisation Of Sensor Surfacesmentioning

confidence: 99%

“…This was supported by observation of strong SERS signals of the modifiers from the MeLLFs. [23] However, recent studies have shown there are compounds which promote MeLLF formation without surface adsorption as shown by the SERS spectra of the MeLLFs, which are identical to those of the parent colloid. [24] This SERS evidence was key in showing that there are two separate mechanisms for MeLLF formation based on increased particle hydrophobicity and/or decreased Coulombic repulsion between the particles.…”

Section: Characterisation Of Sensor Surfacesmentioning

confidence: 99%

Surface‐Enhanced Raman Spectroscopy as a Probe of the Surface Chemistry of Nanostructured Materials

et al. 2016

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Surface‐enhanced Raman spectroscopy (SERS) is now widely used as a rapid and inexpensive tool for chemical/biochemical analysis. The method can give enormous increases in the intensities of the Raman signals of low‐concentration molecular targets if they are adsorbed on suitable enhancing substrates, which are typically composed of nanostructured Ag or Au. However, the features of SERS that allow it to be used as a chemical sensor also mean that it can be used as a powerful probe of the surface chemistry of any nanostructured material that can provide SERS enhancement. This is important because it is the surface chemistry that controls how these materials interact with their local environment and, in real applications, this interaction can be more important than more commonly measured properties such as morphology or plasmonic absorption. Here, the opportunity that this approach to SERS provides is illustrated with examples where the surface chemistry is both characterized and controlled in order to create functional nanomaterials.

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“…Stable interfacial assemblies of silver nano-particles have been previously reported in the literature and are known as MEtal Liquid-Like Films, or MELLFs (Yogev & Efrima 1988;Gordon et al 1989). MELLFs were originally used in spectroscopic experiments to study the chemicals that coated the colloidal grains.…”

Section: Nanoengineered Liquid Mirrorsmentioning

confidence: 99%

Tiltable rotating liquid mirrors: a progress report

Gagné¹,

Borra²,

Ritcey³

2007

A&A

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Context. We give a progress report on tiltable, nanoengineered, rotating liquid mirrors, which were discussed in previous papers. Aims. We want to develop the technology, improve reflectivities and user-friendliness. The ultimate goal is to demonstrate high-quality liquid mirrors that can be tilted by a few tens of degrees. Methods. We coated hydrophilic liquid substrates that have poor reflectivities with a reflective layer of self-assembling metallic nanoparticles. We analyzed the wavefronts of 1-m diameter mirrors with Ronchi tests, knife-edge tests and point-spread functions (PSFs).Results. There is significant improvement over previous work where the reflecting layer was deposited on hydrophobic oils. While previous work only demonstrated tilted low-reflectivity mirrors, we now test a high-reflectivity 1-m diameter liquid mirror tilted by 45 arcmin. Conclusions. It is considerably easier to coat hydrophilic liquids than hydrophobic ones. We have reached a significant milestone by demonstrating a tilted, highly reflective, liquid mirror. Although this is still an immature technology, it is near the stage where it could be used in astronomy. The remaining technical challenges, for which we propose solutions, are not fundamental and could be overcome with additional work. This will be a worthwhile undertaking, considering the very low cost of liquid mirrors.

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Enhanced Raman scattering from liquid metal films formed from silver sols

Cited by 53 publications

References 0 publications

Self-assembled nanoparticle arrays for multiphase trace analyte detection

Self-assembled nanoparticle arrays for multiphase trace analyte detection

Surface‐Enhanced Raman Spectroscopy as a Probe of the Surface Chemistry of Nanostructured Materials

Tiltable rotating liquid mirrors: a progress report

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