Carbon Assisted Electroless Gold for Surface Enhanced Raman Scattering Studies

Bhuvana, Thiruvelu; Kumar, G. V. Pavan; Narayana, Chandrabhas

doi:10.1021/jp070141o

Cited by 25 publications

(18 citation statements)

References 45 publications

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“…Palladium hierarchical structure is also found to enhance the Raman signal of the adsorbed thiol molecules (Figure 4c). The enhancement factor calculated taking into account the ν(C-S) trans stretch, following the procedure suggested by Yu et al4748, is 0.36 × 10 5 (see Supplementary S19 for calculation).…”

Section: Resultsmentioning

confidence: 99%

Metal hierarchical patterning by direct nanoimprint lithography

Radha

Lim

Saifullah

et al. 2013

Sci Rep

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Three-dimensional hierarchical patterning of metals is of paramount importance in diverse fields involving photonics, controlling surface wettability and wearable electronics. Conventionally, this type of structuring is tedious and usually involves layer-by-layer lithographic patterning. Here, we describe a simple process of direct nanoimprint lithography using palladium benzylthiolate, a versatile metal-organic ink, which not only leads to the formation of hierarchical patterns but also is amenable to layer-by-layer stacking of the metal over large areas. The key to achieving such multi-faceted patterning is hysteretic melting of ink, enabling its shaping. It undergoes transformation to metallic palladium under gentle thermal conditions without affecting the integrity of the hierarchical patterns on micro- as well as nanoscale. A metallic rice leaf structure showing anisotropic wetting behavior and woodpile-like structures were thus fabricated. Furthermore, this method is extendable for transferring imprinted structures to a flexible substrate to make them robust enough to sustain numerous bending cycles.

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Section: Resultsmentioning

confidence: 99%

Metal hierarchical patterning by direct nanoimprint lithography

Radha

Lim

Saifullah

et al. 2013

Sci Rep

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“…The excitation source was 632·8 nm He-Ne laser with a laser power of ∼8 mW at the sample and the typical integration time was 10 s. All the SERS experiments were done using a long working distance, high numerical aperture objective lens, which served the purpose of both, focusing the laser and collecting the Raman signals. For temperature-dependent measurements of SERS, a Linkam cryostage TMS-650 (UK) was used, as reported in Bhuvana et al (2007).…”

Section: Measurementsmentioning

confidence: 99%

“…Raman scattering has been a well-established tool to study temperature and pressure-dependant phenomenon (Long 1977;Manfait and Nabiev 1996). Of late, due to advancement in optical and cryogenic instrumentation, temperature-dependant SERS has evolved as a new technique to test fundamental aspects (Maher et al 2006) and applications (Bhuvana et al 2007) of nanoparticle films. In order to test the robustness of metal-coated magnetic nanoparticle film, we have performed temperature-dependent SERS on γ -Fe 2 O 3 @Ag nanoparticles drop coated over a microscope cover slip.…”

Section: Temperature Dependent Sers Using γ -Fe 2 O 3 @Ag Nanoparticlesmentioning

confidence: 99%

Metal-coated magnetic nanoparticles for surface enhanced Raman scattering studies

et al. 2011

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We report the optimization and usage of surfactantless, water dispersible Ag and Au-coated γ -Fe 2 O 3 nanoparticles for applications in surface-enhanced Raman scattering (SERS). These nanoparticles, with plasmonic as well as super paramagnetic properties exhibit Raman enhancement factors of the order of 10 6 (10 5 ) for Ag (Au) coating, which are on par with the conventional Ag and Au nanoparticles. Raman markers like 2-naphthalenethiol, rhodamine-B and rhodamine-6G have been adsorbed to these nanoparticles and tested for nonresonant SERS at low concentrations. Further, to confirm the robustness of Ag-coated nanoparticles, we have performed temperaturedependent SERS in the temperature range of 77-473 K. The adsorbed molecules exhibit stable SERS spectra except at temperatures >323 K, where the thermal desorption of test molecule (naphthalenethiol) were evident. The magnetic properties of these nanoparticles combined with SERS provide a wide range of applications.

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“…Nowadays, there are sophisticated methods of lithographically imprinting metal nanostructures on solid substrates, with suitable morphology 2, 12–16. Gunnarsson et al12 employed electron‐beam (e‐beam) lithography (EBL) and made arrays of electromagnetically coupled Ag nanoparticles on silicon, while Félidj et al13 studied the optical response of EBL‐patterned Au and reported an enhancement factor G of ≈10 5 .…”

Section: Introductionmentioning

confidence: 99%

A SERS‐Active Nanocrystalline Pd Substrate and its Nanopatterning Leading to Biochip Fabrication

Bhuvana

2008

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Nanocrystalline metallic Pd films have been produced by thermolysis of Pd hexadecanethiolate deposited on a Si surface. The particle size was in the range of 50-60 nm based on electron and atomic force microscopy. The Pd surface produced was found to be surface-enhanced Raman scattering (SERS) active with an enhancement factor of approximately 10(5). The electron-resist behavior of Pd thiolate is exploited in conceptualizing a prototype chip with patterned Pd regions that are SERS active, called "SERS bits", which host different biomolecules.

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Carbon Assisted Electroless Gold for Surface Enhanced Raman Scattering Studies

Cited by 25 publications

References 45 publications

Metal hierarchical patterning by direct nanoimprint lithography

Metal hierarchical patterning by direct nanoimprint lithography

Metal-coated magnetic nanoparticles for surface enhanced Raman scattering studies

A SERS‐Active Nanocrystalline Pd Substrate and its Nanopatterning Leading to Biochip Fabrication

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