Surface-enhanced Raman spectroscopy scattering from gold-coated ceramic nanopore substrates: effect of nanopore size

Robinson, Paul D.; Kassu, Aschalew; Sharma, Anup; Kukhtareva, T.; Farley, Carlton; Smith, C.; Ruffin, Paul; Brantley, Christina; Edwards, Eugene

doi:10.1117/1.jnp.7.073592

Cited by 9 publications

(12 citation statements)

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“…SERS offers rich structural information and is undoubtedly one of the most promising label-free detection techniques. To date, few works have been done concerning fluidic plasmonic nanopore sensing, although nanoporebased SERS substrates were demonstrated [9,10]. Also, in Refs.…”

Section: Introductionmentioning

confidence: 99%

Plasmonic nanopore-based platforms for single-molecule Raman scattering

Deng

Wang

Liu

et al. 2016

Optics Communications

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a b s t r a c tWe propose and demonstrate a novel plasmonic nanopore platform based on a bowtie-nanopore structure, for single-molecule sensing. In this nano-structure, nano-bowties are integrated with solidstate nanopores to provide localized surface plasmon resonances for signal enhancement. We design and optimize the nano-structure by tuning both the bowtie gap and the bowtie angle, and investigate their influences on field enhancement, thereby achieving single-molecule sensitivity. In addition, we study the field enhancement by introducing an engineered photonic nano-cavity. This further strengthens the electric enhancement. An overall Raman enhancement factor of 2 Â 10 8 is achieved in our simulation. This is believed to be sufficient for single-molecule sensing. The proposed bowtie-nanopore structure can be multiplexed on a single substrate for simultaneous multi-channel detection, paving the way for demanding applications such as DNA sequencing.

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Section: Introductionmentioning

confidence: 99%

Plasmonic nanopore-based platforms for single-molecule Raman scattering

Deng

Wang

Liu

et al. 2016

Optics Communications

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“…This increase in intensity may not only dependent on the adsorption of gases onto the surface of the Au NPs, but also due to imperfections on the surfaces of the NPs, lattice defects, etc . However, the aggregation of the Au NPs after the adsorption of gaseous species is the major factor . This aggregation results the strong coupling because of the dipole‐dipole interactions that occur when the distance between adjacent NPs is typically smaller than the size of the NPs, which broadens the spectrum and also red shifts the plasmon band.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, the significant red shift in the UV‐Vis spectra might be the result of smaller Au NPs agglomerating. This is a well‐known phenomenon, where, because of the agglomeration of nanostructures, the shape of the UV‐Vis spectra becomes broader and the plasmon band becomes asymmetrical after the exposure of sensors to the gaseous environment …”

Section: Resultsmentioning

confidence: 99%

“…The adsorption of analyte gas molecules onto the 2D PSCCs may also result in the agglomeration or densification of the Au NPs because of the deswelling of the 2D PSCCs in the Au NP/2D PSCC/PDMS flexible sensing systems . This process of deswelling and densification results in a considerable variation in the inter‐particle distance of the Au NPs on the 2D PSCCs, concentrating more charges near the inter‐particle junctions, which results in the formation of a “hot spot” and greatly enhances the SERS signal ,. It is thought that after the H 2 S molecules are adsorbed onto the surface of the Au NPs, the full‐scale agglomeration of Au NPs might occur compared to the other gases, which results in the maximum electromagnetic coupling between the discrete Au NPs and SERS signal.…”

Section: Resultsmentioning

confidence: 99%

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Highly Sensitive Surface‐Enhanced Raman Scattering (SERS)‐ Based Multi Gas Sensor : Au Nanoparticles Decorated on Partially Embedded 2D Colloidal Crystals into Elastomer

et al. 2017

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Advent of surface‐enhanced Raman spectroscopy (SERS) has engendered, the attention to exploit a facile, cost effective, 2D self‐assembly based architecture for sensing. Here, Au nanoparticles are decorated on controlled morphology of 2D polystyrene colloidal crystals (PSCCs), partially embedded into flexible polydimethylsiloxane elastomer. Self‐assembled flexible hexagonally close‐packed PSCCs form the 75 and 25 nm voids in the 500 and 200 nm, PSCCs monolayers and act as an effective plasmonic propagator for SERS sensors signal. Optical and sensing response investigates with UV‐Vis and Raman spectroscopy after the exposure of Au NP/2D PS CC/PDMS to NH3, H2O2, N2O and H2S gases environment. The increase in the SERS intensity at 491 cm−1 for the 200 nm, CCs based sensors as compared to 500 nm, indicates that the sensing response, strongly dependent on the CCs size. The red‐shift in the UV‐Vis spectra and enhancement in intensity of SERS designate that H2S forms the maximum Au NPs aggregates over the all tested gases. The chemisorptions on the phenyl ring, due to B2 symmetric modes of the PSCCs with orthogonal polarizability of Au NPs, act as a hot spot for higher sensing response for the detection of gaseous precursors with higher SERS sensitivity and reliability.

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“…Due to these benefits, the potential applications of NAAO membranes as an optical, chemical and biosensing platform and devices is widely investigated [ 15 , 16 , 17 , 18 , 19 ]. In our previous work [ 20 ], we used a single gold film-thickness of 62 nm on three substrates with pore-size of 35, 80 and 150 nm. A later conference proceeding [ 21 ] described preliminary work with four different gold-film thicknesses on a single substrate of 35 nm pore size.…”

Section: Introductionmentioning

confidence: 99%

Effect of Pore Size and Film Thickness on Gold-Coated Nanoporous Anodic Aluminum Oxide Substrates for Surface-Enhanced Raman Scattering Sensor

Kassu

Farley

Sharma

et al. 2015

Sensors

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A sensitive surface enhanced Raman scattering chemical sensor is demonstrated by using inexpensive gold-coated nanoporous anodic aluminum oxide substrates. To optimize the performance of the substrates for sensing by the Surface-enhanced Raman scattering (SERS) technique, the size of the nanopores is varied from 18 nm to 150 nm and the gold film thickness is varied from 30 nm to 120 nm. The sensitivity of gold-coated nanoporous surface enhanced Raman scattering sensor is characterized by detecting low concentrations of Rhodamine 6G laser dye molecules. The morphology of the SERS substrates is characterized by atomic force microscopy. Optical properties of the nanoporous SERS substrates including transmittance, reflectance, and absorbance are also investigated. Relative signal enhancement is plotted for a range of substrate parameters and a detection limit of 10−6 M is established.

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Surface-enhanced Raman spectroscopy scattering from gold-coated ceramic nanopore substrates: effect of nanopore size

Cited by 9 publications

References 0 publications

Plasmonic nanopore-based platforms for single-molecule Raman scattering

Plasmonic nanopore-based platforms for single-molecule Raman scattering

Highly Sensitive Surface‐Enhanced Raman Scattering (SERS)‐ Based Multi Gas Sensor : Au Nanoparticles Decorated on Partially Embedded 2D Colloidal Crystals into Elastomer

Effect of Pore Size and Film Thickness on Gold-Coated Nanoporous Anodic Aluminum Oxide Substrates for Surface-Enhanced Raman Scattering Sensor

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