Large-Scale Plasmonic nanoCones Array For Spectroscopy Detection

Das, Gobind; Battista, Edmondo; Manzo, G.; Causa, Filippo; Netti, Paolo Antonio; Fabrizio, E. Di

doi:10.1021/acsami.5b06887

Cited by 31 publications

(23 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To showcase this prospect, the thiol–NR surface interactions are also characterized when SDS is present. Note that SDS is a surfactant commonly used for controlling the growth directionality during nanoparticle synthesis, as its head group adsorbs to the nanoparticle surface . By introducing SDS, wavelength shift patterns unlike those previously discussed will appear.…”

mentioning

confidence: 96%

In Situ Observation of Single‐Molecule Surface Reactions from Low to High Affinities

2016

View full text Add to dashboard Cite

In situ observation of single-molecule surface reactions from low to high affinities is achieved by resonant coupling between optical whispering-gallery modes and the localized surface plasmon of nanorods. Transient and permanent interactions between ligands (thiol, amine) and the gold surface are monitored without labels, allowing direct determination of the associated kinetic constants and rapid development of new functionalization protocols.

show abstract

mentioning

confidence: 96%

In Situ Observation of Single‐Molecule Surface Reactions from Low to High Affinities

2016

View full text Add to dashboard Cite

show abstract

“…Colloidal metallic nanoparticles have been used in various areas, including nanobiotechnology [1,2], cancer diagnosis [3], drug delivery [4,5], and sensing [6][7][8]. Key features of these nanoparticles are the experimental simplicity of their synthesis and possible tuning of plasmonic properties by varying their size, shape and dielectric constant.…”

Section: Introductionmentioning

confidence: 99%

Designing Silver Nanoparticles for Detecting Levodopa (3,4-Dihydroxyphenylalanine, L-Dopa) Using Surface-Enhanced Raman Scattering (SERS)

Rubira

Camacho

Martin

et al. 2019

Sensors

View full text Add to dashboard Cite

Detection of the drug Levodopa (3,4-dihydroxyphenylalanine, L-Dopa) is essential for the medical treatment of several neural disorders, including Parkinson's disease. In this paper, we employed surface-enhanced Raman scattering (SERS) with three shapes of silver nanoparticles (nanostars, AgNS; nanospheres, AgNP; and nanoplates, AgNPL) to detect L-Dopa in the nanoparticle dispersions. The sensitivity of the L-Dopa SERS signal depended on both nanoparticle shape and L-Dopa concentration. The adsorption mechanisms of L-Dopa on the nanoparticles inferred from a detailed analysis of the Raman spectra allowed us to determine the chemical groups involved. For instance, at concentrations below/equivalent to the limit found in human plasma (between 10 −7 -10 −8 mol/L), L-Dopa adsorbs on AgNP through its ring, while at 10 −5 -10 −6 mol/L adsorption is driven by the amino group. At even higher concentrations, above 10 −4 mol/L, L-Dopa polymerization predominates. Therefore, our results show that adsorption depends on both the type of Ag nanoparticles (shape and chemical groups surrounding the Ag surface) and the L-Dopa concentration. The overall strategy based on SERS is a step forward to the design of nanostructures to detect analytes of clinical interest with high specificity and at varied concentration ranges.Sensors 2020, 20, 15 2 of 18 atrazine (ATZ) on Ag nanospheres (AgNP) made it possible to detect picomolar concentrations of ATZ using SERS, whose intensity was higher in solution than in a cast film [7]. This also means that the orientation of ATZ molecules on AgNP is crucial for this ultrasensitive analysis. One may infer that signal enhancement for analytes can be obtained by tailoring the size and shape of the nanoparticles [12][13][14], in addition to the conformation of the analyte adsorbed as in the detection of B-complex vitamins in pharmaceutical samples [15].Such control in nanoparticle shape is afforded through various synthetic routes [16][17][18], then allowing the Localized Surface Plasmon Resonances (LSPR) to be tuned according to the region of best response (excitation) of the analyte [14,18,19]. For example, the near electromagnetic field is higher in nanoprisms (AgNPR), nanostars (AgNS) and nanorods (AgNR) than on spherical nanoparticles (AgNP) [18,19], and the LSPR may be wider to allow excitation down to the near infrared (IR) [18][19][20]. Indeed, Rycenga et al. [21] reported higher SERS activity for three molecules adsorbed on Ag nanocubes (AgNC) than on AgNP due to the wider LSPR for AgNC. Izquierdo-Lorenzo et al. [18] found that AgNPR were more efficient than AgNP for detecting aminoglutethimide used in sport doping owing to field enhancement in the corners of AgNPR, forming interstitial junctions, which are called "hot spots".The adsorption (and orientation, as a consequence) of an analyte can in principle be controlled by: (a) the affinity between analyte and metal; (b) charge of the analyte, which can be modulated via pH; (c) size and shape of the nanoparticles, and (d) metallic surface, wh...

show abstract

“…The first observation of extraordinary optical transmission (EOT) through subwavelength apertures was made by Ebbesen et al in 1998 . Since then, there has been considerable effort invested in understanding the properties, behavior, and responses of subwavelength apertures as highlighted in the 2010 review of Garcia‐Vidal et al The rapidly increasing interest in this field is motivated by the broad range of applications for these devices, which includes color filtering and sensing, and the new physical phenomena, which can be explored. The availability of modern nanofabrication tools to produce even more sophisticated devices has also greatly increased the number of research areas in which subwavelength aperture arrays are having an impact.…”

Section: Introductionmentioning

confidence: 99%

Optical Chemical Barcoding Based on Polarization Controlled Plasmonic Nanopixels

Langley

Balaur

Hwang

et al. 2017

Adv Funct Materials

View full text Add to dashboard Cite

Plasmonic devices offer the possibility of passively detecting changes in local chemistry that opens up a wide range of applications from molecular sensing to monitoring water quality. Conventional plasmonics have previously shown great promise as nanoscale chemical sensors through detection of small variations in the local refractive index (RI). The motivation behind using plasmonics for these applications includes the fact that detection is entirely passive and the devices themselves can be readily miniaturized. Previously, a lack of any control over the output of these devices, has fundamentally limited their application to chemicals which produce clearly identifiable resonances within the range of detection. Here it is demonstrated that microfluidic devices, incorporating polarization-controlled plasmonic nanopixels, allow the device response to be tuned to the particular analyte of interest, anywhere within the visible spectrum. This dramatically increases the effective dynamic range and allows local variations in RI to be perceived directly as color changes by the human eye. Active control over the output of the device also enables clear differentiation between a number of different analytes, paving the way for plasmonics to be used for a wide range of real-world chemical sensing applications.

show abstract

Large-Scale Plasmonic nanoCones Array For Spectroscopy Detection

Abstract: Advanced optical materials or interfaces are gaining attention for diagnostic applications.

Cited by 31 publications

References 55 publications

In Situ Observation of Single‐Molecule Surface Reactions from Low to High Affinities

In Situ Observation of Single‐Molecule Surface Reactions from Low to High Affinities

Designing Silver Nanoparticles for Detecting Levodopa (3,4-Dihydroxyphenylalanine, L-Dopa) Using Surface-Enhanced Raman Scattering (SERS)

Optical Chemical Barcoding Based on Polarization Controlled Plasmonic Nanopixels

Contact Info

Product

Resources

About