Differential role of PVP on the synthesis of plasmonic gold nanostructures and their catalytic and SERS properties

Verma, Manoj; Kedia, Abhitosh; Newmai, M. Boazbou; Kumar, Pankaj

doi:10.1039/c6ra18345j

Cited by 40 publications

(25 citation statements)

References 63 publications

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“…For instance, in the case of the highest molecular weight of PVP, the weight concentration needed to increase from 0.2 to 7.2 μg/mL which favored the formation of spherical nanoparticles. Nonetheless, 360PVP at higher weight concentration of 7.2 μg/mL might not be acting as a reducing agent because the molar ratio of PVP to gold ions is around 0.13 which is much lower than reported values ,,…”

Section: Resultsmentioning

confidence: 85%

“…Nonetheless, 360PVP at higher weight concentration of 7.2 μg/mL might not be acting as a reducing agent because the molar ratio of PVP to gold ions is around 0.13 which is much lower than reported values. [31,32,39] Figure 4 shows the TEM image, dimensions and the aspect ratio distribution for AuNRs control and samples with PVP of same weight concentration. For 10PVP at 0.2 μg/mL, we observed a reduction in length of nanorods of 8 nm so the aspect ratio decreased from 6.7 to 5.4 ( Figure 4A and 4B).…”

Section: Resultsmentioning

confidence: 99%

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Synthesis of Gold Nanorods Using Poly(vinylpyrrolidone) of Different Molecular Weights as an Additive

2018

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The use of poly(vinylpyrrolidone) (PVP) of different molecular weights (5‐360 kDa) during the synthesis of gold nanorods (AuNRs) via seedless and seed‐mediated approaches is reported. For both syntheses, the LSPR band can be tuned from 700 to 1050 nm by modifying the molecular weight of PVP in a time dependent addition of polymer. Moreover, the growth of AuNRs in 100 mM cetyltrimethylammonium bromide (CTAB) is accelerated as the molecular weight of PVP increases from 5 to 360 kDa for the seedless approach. In the case of AuNRs synthesized by the seed‐mediated approach, the aspect ratio decreases from 7.41 to 3.72 as the molecular weight of PVP increases to 55 kDa. For both protocols, high molecular weight of PVP reduces the shape yield despite of producing smaller AuNRs. Therefore, the incorporation of small amounts of PVP during the growth stage can be utilized for the preparation of anisotropic nanostructures to tune their optical properties and improve their shape yield.

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Section: Resultsmentioning

confidence: 85%

Section: Resultsmentioning

confidence: 99%

Synthesis of Gold Nanorods Using Poly(vinylpyrrolidone) of Different Molecular Weights as an Additive

2018

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“…An effective restoring force on the driven electrons is induced by the curved surface of the particle leading to resonance and field amplification both inside and in the near-field zone outside the particle. This resonance is called the localized surface plasmon or short localized plasmon resonance [6][7][8][9][10][11]. Plasmon resonances can be excited by direct light illumination which do not require any phasematching.…”

Section: Introductionmentioning

confidence: 99%

A Perspective on Plasmonics within and beyond the Electrostatic Approximation

Pathak¹,

Parthasarathi²,

Pandey³

et al. 2018

Plasmonics

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Plasmonic is an emerging branch of nanophotonics wherein the electromagnetic properties of nanoparticles are studied for variety of applications. The optics of nanoparticles is studied in terms of surface plasmon resonances and optical cross section. Initially the first principle approach has been used to study the plasmonic fundamentals known as electrostatic approach. Under this approach, various parameters are taken into account to observe the electromagnetic properties of plasmonic nanogeometries. This electrostatic model is only used to analyze the optical signature of smaller size plasmonic geometries. Therefore, for the estimation of optical properties of larger size nanoparticle numerical model (Discrete Dipole Approximation) has been used. The observed surface plasmon resonances could be useful in sensing field, SERS signal detection and thin film solar cell application.

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“…The catalytic activity of nanoparticles depends on their shape, size, and composition . For high catalytic activity a dispersion of nanoparticles stable against aggregation in the desired reaction medium is an essential requirement.…”

Section: Introductionmentioning

confidence: 99%

“…K E Y W O R D S DFT calculation, IR spectroscopy, NBO analysis, nitrobenzene, silver cluster 1 | I N TR ODU C TI ONThe catalytic activity of nanoparticles depends on their shape, size, and composition. [1][2][3] For high catalytic activity a dispersion of nanoparticles stable against aggregation in the desired reaction medium is an essential requirement. In liquid phase nanoparticle synthesis, polymeric molecules are often used for stabilizing nanoparticles against aggregation.…”

mentioning

confidence: 99%

Catalytic activation of nitrobenzene on PVP passivated silver cluster: A DFT investigation

Shukla

Sinha

2017

Int J of Quantum Chemistry

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Poly(N‐vinyl‐2‐pyrrolidone) (PVP) has been used extensively to stabilize the surface of noble metal nanoparticles against aggregation and also to produce anisotropic nanostructures. Naturally, it is very important to understand the effect of such surface stabilization by PVP on the catalytic activity of these nanoparticles. This communication investigates through DFT calculations the electronic properties of PVP stabilized 13‐atom Ag cluster for catalytic activation of nitrobenzene (NB). These computations suggest that poly(N‐vinyl‐2‐pyrrolidone) (PVP) interact with silver (Ag) cluster mainly through oxygen atom and acts not only as a stabilizer to prevent the aggregation of Ag clusters but also as an electron donor to activate the Ag clusters for further reaction. Natural Bonding Orbital (NBO) calculations show that catalytic activation of NB by PVP passivated Ag cluster occurs due to interaction of the oxygen of the nitro group with the Ag cluster. Weak back donation of electrons from M(dπ) orbital of Ag to antibonding σ* of one of the NO bond, facilitates the formation of the nitroso intermediate. To understand the extent and the nature of this interaction better, vibrational frequency calculation of nitrobenzene association with Ag13‐2PVP cluster is carried out. Red shift in the frequencies is consequence of strong interaction with that of silver cluster present in Ag13‐2PVP‐NB model.

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Differential role of PVP on the synthesis of plasmonic gold nanostructures and their catalytic and SERS properties

Abstract: Differential role of PVP modified with halide ions has been meticulously studied for in situ tuning of Au nanoparticle growth utilizing XRD measurements together with FTIR data, thus quantifying their catalysis and SERS applications.

Cited by 40 publications

References 63 publications

Synthesis of Gold Nanorods Using Poly(vinylpyrrolidone) of Different Molecular Weights as an Additive

Synthesis of Gold Nanorods Using Poly(vinylpyrrolidone) of Different Molecular Weights as an Additive

A Perspective on Plasmonics within and beyond the Electrostatic Approximation

Catalytic activation of nitrobenzene on PVP passivated silver cluster: A DFT investigation

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