Tailoring Surface Plasmon Resonance Wavelengths and Sensoric Potential of Core–Shell Metal Nanoparticles

Sekhon, Jagmeet Singh; Malik, Hitendra K.; Verma, S. S.

doi:10.1166/sl.2013.2923

Cited by 14 publications

(7 citation statements)

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“…Interestingly, the RIS enhances linearly with the aspect ratio, same as in case of Au nanorods [14]. The sensitivity of is higher than that of Au nanospheres [14] and nanocubes [15]. Again the enhancement in RIS is linear with the aspect ratio and expression from the linear fit is .…”

Section: Triangular Nanoprismsmentioning

confidence: 82%

“…Hence, the LSPR spectra can be easily tuned over the visible to near infrared regime by controlling the geometrical parameters of the nanoprism. Interestingly, the tunability of LSPR is not limited in the triangular nanoprisms as in case of nanospheres [14] and nanocubes [15] but it is like that of nanorods [14].…”

Section: Triangular Nanoprismsmentioning

confidence: 99%

“…Again the enhancement in RIS is linear with the aspect ratio and expression from the linear fit is . an evidence to show that the sensitivity of nanoparticle plasmon resonance towards the environmental change can be directly obtained from the resonance peak position instead of going into detail of the nanoparticle structure as also shown form the studies on nanorods [16] and nanocubes [15].…”

Section: Triangular Nanoprismsmentioning

confidence: 99%

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Controlling the LSPR properties of Au triangular nanoprisms and nanoboxes by geometrical parameter: a numerical investigation

Sekhon

Verma

2014

Journal of Modern Optics

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We have simulated the extinction spectra of Au triangular nanoprisms and nanoboxes by finite difference time domain (FDTD) method. It is found that the refractive index sensitivity increases linearly and near exponentially as the aspect ratio of nanoprisms increases and wall thickness of nanoboxes decreases. A sensing figure of merit (FOM) calculations shows that there is an optimum wall thickness for each edge length and height of the box, which makes them to be promising candidate for effective sensing applications. We have also shown that the higher FOM in triangular nanoboxes compared to the cubic nanoboxes and other solid structure is inherent in the shape of nanoparticles.

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Section: Triangular Nanoprismsmentioning

confidence: 82%

Section: Triangular Nanoprismsmentioning

confidence: 99%

Section: Triangular Nanoprismsmentioning

confidence: 99%

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Controlling the LSPR properties of Au triangular nanoprisms and nanoboxes by geometrical parameter: a numerical investigation

Sekhon

Verma

2014

Journal of Modern Optics

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“…Typical metals that commonly demonstrate this plasmonic phenomenon are gold [ 1 , 2 ], silver [ 3 , 4 ], platinum [ 5 ] and palladium [ 6 , 7 , 8 ]. Surface plasmon is very sensitive and responsive to changes in the dielectric constant of the surrounding medium [ 9 , 10 ] making it potential for sensing applications [ 11 , 12 ]. Furthermore, surface plasmon is noted to be more unique when it is locally confined in a nanostructure which generates a localized surface plasmon resonance (LSPR) effect [ 1 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

Gold Nanoplates for a Localized Surface Plasmon Resonance-Based Boric Acid Sensor

Morsin

Salleh

Umar

et al. 2017

Sensors

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Localized surface plasmon resonance (LSPR) properties of metallic nanostructures, such as gold, are very sensitive to the dielectric environment of the material, which can simply be adjusted by changing its shape and size through modification of the synthesizing process. Thus, these unique properties are very promising, particularly for the detection of various types of chemicals, for example boric acid which is a non-permitted preservative employed in food preparations. For the sensing material, gold (Au) nanoplates with a variety of shapes, i.e., triangular, hexagonal, truncated pentagon and flat rod, were prepared using a seed-mediated growth method. The yield of Au nanoplates was estimated to be ca. 63% over all areas of the sensing material. The nanoplates produced two absorption bands, i.e., the transverse surface plasmon resonance (t-SPR) and the longitudinal surface plasmon resonance (l-SPR) at 545 nm and 710 nm, respectively. In the sensing study, these two bands were used to examine the response of gold nanoplates to the presence of boric acid in an aqueous environment. In a typical process, when the sample is immersed into an aqueous solution containing boric acid, these two bands may change their intensity and peak centers as a result of the interaction between the boric acid and the gold nanoplates. The changes in the intensities and peak positions of t-SPR and l-SPR linearly correlated with the change in the boric acid concentration in the solution.

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“…[5][6][7] With this flexibility in tunability of their optical properties, noble metal nanoparticles can be used in variety of emerging applications such as thin-film solar cells, 2, 4 plasmon sensors, 8 surface enhanced Raman spectroscopy (SERS) 9 and biomedical applications 10 etc. The optical properties of individual noble metal nanoparticles (Ag, Au and Cu) have been studied by many researchers [11][12][13] but their bimetallic nanoparticles such as alloys 14,15 and core-shell nanostructures 16 have attracted much attention, because of their large tunability in LSPR as compared to the individual noble metals. The optical properties of alloy nanoparticles can be tuned by varying the metal and their composition in the alloy nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Simulated study of plasmonic coupling in noble bimetallic alloy nanosphere arrays

Bansal

Verma

2014

AIP Advances

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The plasmonic coupling between the interacting noble metal nanoparticles plays an important role to influence the optical properties of arrays. In this work, we have extended the Mie theory results of our recent communication to include the effect of particle interactions between the alloy nanoparticles by varying interparticle distance and number of particles. The localized surface plasmon resonance (LSPR) peak position, full width at half maxima (FWHM) and scattering efficiency of one dimensional (1D) bimetallic alloy nanosphere (BANS) arrays of earlier optimized compositions i.e. Ag0.75Au0.25, Au0.25Cu0.75 and Ag0.50Cu0.50 have been studied presently by using discrete dipole approximation (DDA) simulations. Studies have been made to optimize size of the nanosphere, number of spheres in the arrays, material and the interparticle distance. It has been found that both the scattering efficiency and FWHM (bandwidth) can be controlled in the large region of the electromagnetic (EM) spectrum by varying the number of interacting particles and interparticle distance. In comparison to other alloy arrays, Ag0.50Cu0.50 BANS arrays (each of particle radius 50 nm) shows larger tunability of LSPR with wide bandwidth (essential condition for plasmonic solar cells).

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Tailoring Surface Plasmon Resonance Wavelengths and Sensoric Potential of Core–Shell Metal Nanoparticles

Cited by 14 publications

References 1 publication

Controlling the LSPR properties of Au triangular nanoprisms and nanoboxes by geometrical parameter: a numerical investigation

Controlling the LSPR properties of Au triangular nanoprisms and nanoboxes by geometrical parameter: a numerical investigation

Gold Nanoplates for a Localized Surface Plasmon Resonance-Based Boric Acid Sensor

Simulated study of plasmonic coupling in noble bimetallic alloy nanosphere arrays

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