Correction to Electroless Plating of Thin Gold Films Directly onto Silicon Nitride Thin Films and into Micropores

Whelan, Julie C.; Karawdeniya, Buddini I.; Bandara, Y. M. Nuwan D. Y.; Velleco, Brian D.; Masterson, Caitlin M.; Dwyer, Jason R.

doi:10.1021/acsami.5b09596

Cited by 8 publications

(14 citation statements)

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“…78 The gold surfaces were coated with Rh6G using spin-casting, using conditions previously used to coat glass. 65 Direct measurement of the thickness of the Rh6G layer using optical or AFM methods proved to be ineffective.…”

Section: Resultsmentioning

confidence: 99%

A comparison of SERS and MEF of rhodamine 6G on a gold substrate

Kohr

Karawdeniya

Dwyer

et al. 2017

Phys. Chem. Chem. Phys.

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Rhodamine 6G is spin-cast onto gold surfaces and the reflectance, emission, excitation, and SERS spectra are reported. Electron microscopy shows that the particle sizes of the gold are uniform for all preparations. Reflection spectra show that the Rh6G aggregates for thicker films and that the gold plasmon band shifts due to the refractive index change on the surface. The intensity of the SERS spectra increases with increasing surface coverage but the rate of change modulates between submonolayer and multilayer surface densities. The emission spectra behave unexpectedly as a function of Rh6G coverage. At submonolayer coverage the emission is relatively strong, decreases as the surface density increases to a monolayer, and then increases as the Rh6G thickness increases. Excitation spectra demonstrate that the emitting species at low surface density is monomeric but for thicker layers the excited state responsible for emission is Rh6G aggregates. For the thicker films, the Rh6G acts as its own dielectric layer for metal enhanced fluorescence of the aggregates.iii ACKNOWLEDGMENTS

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Section: Resultsmentioning

confidence: 99%

A comparison of SERS and MEF of rhodamine 6G on a gold substrate

Kohr

Karawdeniya

Dwyer

et al. 2017

Phys. Chem. Chem. Phys.

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“…All substrates were electrolessly gold-plated by sequential immersion in the same series of tin(II) chloride-, ammoniacal silver nitrate-, and sodium gold sulfite-containing solutions (Scheme S1), with appropriate rinsing steps in between immersions. The solutions were prepared as previously reported. , Immediately prior to direct plating of bare silicon or silicon nitride surfaces, they were oxygen-plasma-treated and then etched with dilute hydrofluoric acid. The severe chemical hazards presented by hydrofluoric acid require special precautions such as those detailed in the Supporting Information.…”

Section: Methodsmentioning

confidence: 99%

General Strategy To Make an On-Demand Library of Structurally and Functionally Diverse SERS Substrates

Karawdeniya

Bandara

Whelan

et al. 2018

ACS Appl. Nano Mater.

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Surface enhanced Raman spectroscopy; SERS; electroless plating; metallization.ABSTRACT Surface-enhanced Raman spectroscopy (SERS) is a powerful technique for sensing molecules proximal to suitable coinage metal surfaces. The physical structure of the SERS-active metal layer and its support is a key design parameter inspiring considerable, and frequently specialized, efforts in substrate fabrication. The necessary gold film structure can arise from both the metallization process and the underlying support structure, and the structure of the support can deliver additional functions including analytical capabilities such as physical filtering. We used electroless plating as a general approach to create a library of SERS substrates: SERSactive gold films on a range of supports made from a variety of materials, made with a mixture of simple and complex fabrication histories, and offering a selection of structurally-derived functions. The result was that supports with existing functions had their capabilities enhanced by the addition of SERS sensing. Electroless plating thus offers a host of beneficial characteristics 3 for nanofabricating multifunctional SERS substrates, including: tolerance to substrate composition and form factor; low equipment overhead requirements; process chemistry flexibility-including compatibility with conventional top-down nanofabrication; and a lengthy history of commercial application as a simple metallization technique. We gold-plated standard nanofabrication-compatible silicon nitride support surfaces with planar and porous architectures, and with native and polymer-grafted surface chemistries. We used the same plating chemistry to form SERS-active gold films on cellulose fibers arrayed in commercial filter paper and formed into nanocellulose paper. In a functional sense, we used electroless plating to augment nanoporous filters, chromatography platforms, and nanofabrication building blocks with SERS capability.

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“…Fluorescence is the most likely optical technique to be used in conjunction with a nanopore, but one could imagine that a suitably structured gold film, separated by a well-defined nanopore gap containing an analyte, might also be used for surface-enhanced Raman spectroscopy. 20,27,46,61,90,[267][268][269][305][306][307][308][309][310][311][312][313][314][315] Extensions to Nanopore Arrays. We conclude our discussion of the merging of physical-and optical-based nanopore sensing and manipulation approaches, with the consideration of nanopore arrays.…”

Section: Nanopore As Nanofluidic Cuvette and Optofluidic Devicementioning

confidence: 99%

“…89 Beyond the design and handling considerations imposed by these calculations and measurements, one should be cautious in using ultrasonication as part of a cleaning process, since it can easily rupture the membranes. 46,90 Optical Properties of Free-Standing Silicon Nitride. Together with the mechanical stability and ease of fabrication, transparency of SiN x windows is one of the key features that makes them appealing for use as sample support structures in various spectroscopic applications.…”

Section: Thin-film Silicon Nitride Membranesmentioning

confidence: 99%

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Through a Window, Brightly: A Review of Selected Nanofabricated Thin-Film Platforms for Spectroscopy, Imaging, and Detection

Dwyer

Harb

2017

Appl Spectrosc

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We present a review of the use of selected nanofabricated thin films to deliver a host of capabilities and insights spanning bioanalytical and biophysical chemistry, materials science, and fundamental molecular-level research. We discuss approaches where thin films have been vital, enabling experimental studies using a variety of optical spectroscopies across the visible and infrared spectral range, electron microscopies, and related techniques such as electron energy loss spectroscopy, X-ray photoelectron spectroscopy, and single molecule sensing. We anchor this broad discussion by highlighting two particularly exciting exemplars: a thin-walled nanofluidic sample cell concept that has advanced the discovery horizons of ultrafast spectroscopy and of electron microscopy investigations of in-liquid samples; and a unique class of thin-film-based nanofluidic devices, designed around a nanopore, with expansive prospects for single molecule sensing. Free-standing, low-stress silicon nitride membranes are a canonical structural element for these applications, and we elucidate the fabrication and resulting features-including mechanical stability, optical properties, X-ray and electron scattering properties, and chemical natureof this material in this format. We also outline design and performance principles and include a discussion of underlying material preparations and properties suitable for understanding the use of alternative thin-film materials such as graphene.

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Correction to Electroless Plating of Thin Gold Films Directly onto Silicon Nitride Thin Films and into Micropores

Cited by 8 publications

References 0 publications

A comparison of SERS and MEF of rhodamine 6G on a gold substrate

A comparison of SERS and MEF of rhodamine 6G on a gold substrate

General Strategy To Make an On-Demand Library of Structurally and Functionally Diverse SERS Substrates

Through a Window, Brightly: A Review of Selected Nanofabricated Thin-Film Platforms for Spectroscopy, Imaging, and Detection

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