Biomolecule induced nanoparticle aggregation: Effect of particle size on interparticle coupling

Basu, Soumen; Ghosh, Sujit Kumar; Kundu, Subrata; Panigrahi, Sudipa; Praharaj, Snigdhamayee; Pande, Surojit; Jana, Subhra; Pal, Tarasankar

doi:10.1016/j.jcis.2007.04.069

Cited by 204 publications

(113 citation statements)

References 75 publications

(55 reference statements)

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“…Peaks were clearly observed at 520-540 nm for all the samples. These peaks were attributed to the SPR absorption [1]. Accordingly, this result supported the deposition of Au nanoparticles on the glass plates.…”

Section: Characterizationsupporting

confidence: 77%

“…Nanometer-sized particles have special interest because they are expected to exhibit unique properties different from those of bulk material [1,2], which is called "size effect. " Among various nanoparticles, nanoparticles of metals such as Au and Ag show a special optical property like surface plasmon resonance (SPR) absorption, which depends on particle size and particle shape [1,3,4].…”

Section: Introductionmentioning

confidence: 99%

“…Among various nanoparticles, nanoparticles of metals such as Au and Ag show a special optical property like surface plasmon resonance (SPR) absorption, which depends on particle size and particle shape [1,3,4]. Since the SPR absorption is also dependent on environment around the particles such as dielectric constant [1,3,4], this dependence can be used to measure dielectric constants of materials [3,4]. Nanoparticles tend to aggregate, which deteriorates their unique properties derived from the size effect.…”

Section: Introductionmentioning

confidence: 99%

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Electroless Deposited Gold Nanoparticles on Glass Plates as Sensors for Measuring the Dielectric Constant of Solutions

Kobayashi

Ishii

2013

Journal of Nanoparticles

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This work describes a method for the deposition of Au nanoparticles on glass plates (Au-glass). An electroless metal plating technique was extended to the Au nanoparticle deposition. The technique consisted of three steps that took place on the glass plate: (1) adsorption of Sn 2+ ions, (2) deposition of metallic Ag nuclei generated by reducing Ag + ions with Sn 2+ ions on the Snadsorbed sites, and (3) deposition of Au nanoparticles by reducing Au + ions on the Ag surface. TEM observation revealed that metallic Au nanoparticles with a size of 34.6 ± 11.5 nm were formed on the glass surface. A surface plasmon resonance absorption peak was observed, and its peak wavelength redshifted by immersing the Au-glass into a solution with a large dielectric constant. The redshift corresponded qualitatively to the calculation by the Mie theory accompanying the Drude expression, which was based on the change of the dielectric constant of the solution. The obtained results indicated that the Au-glass functioned as a sensor for measuring the dielectric constant of the solution.

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Section: Characterizationsupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Electroless Deposited Gold Nanoparticles on Glass Plates as Sensors for Measuring the Dielectric Constant of Solutions

Kobayashi

Ishii

2013

Journal of Nanoparticles

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“…The adsorption spectra show a single maximum at 520 nm in aqueous medium. This absorption band results when the incident photon frequency is resonant with the collective oscillation of the conduction band electrons and is known as the SPR [30,31]. Figure 3a(b-d) shows the extinction spectra of substrates after the immobilization of nanoparticles for different soaking times (3,30, and 60 min) in the colloidal solution of AuNPs.…”

Section: Resultsmentioning

confidence: 99%

Nanostructured and nanopatterned gold surfaces: application to the surface-enhanced Raman spectroscopy

et al. 2013

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Surface-enhanced Raman spectroscopy (SERS) has enormous potential for a range of applications where high sensitivity needs to be combined with good discrimination between molecular targets. However, the SERS technique has trouble finding its industrial development, as was the case with the surface plasmon resonance technology. The main reason is the difficulty to produce stable, reproducible, and highly efficient substrates for quantitative measurements. In this paper, we report a method to obtain two-dimensional regular nanopatterns of gold nanoparticles (AuNPs). The resulting patterns were evaluated by SERS. Our bottom-up strategy was divided into two steps: (a) nanopatterning of the substrate by e-beam lithography and (b) electrostatic adsorption of AuNPs on functionalized substrates. This approach enabled us to highlight the optimal conditions to obtain monolayer, rows, or ring of AuNPs, with homogeneous distribution and high density (800 AuNPs/μm 2 ). The nanostructure distributions on the substrates were displayed by scanning electron microscopy and atomic force microscopy images. Optical properties of our nanostructures were characterized by visible extinction spectra and by the measured enhancements of Raman scattering. Finally, we tried to demonstrate experimentally that, to observe a significant enhancement of SERS, the gold diffusers must be extremely closer. If electron beam lithography is a very attractive technique to perform reproducible SERS substrates, the realization of pattern needs a very high resolution, with distances between nanostructures probably of less than 20 nm.

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“…[1][2][3][4] The development of uniform nanometer size particles has been intensively pursued by reason of their technological and fundamental scienti¯c importance. 5,6 Amid the metal NPs, silver nanoparticles (Ag NPs) is one of the main remarkable materials because of its exceptional properties such as chemical stability, good conductivity, catalysis and antimicrobial activity. 7 These properties of Ag NPs acutely depend on their size and morphology.…”

Section: Introductionmentioning

confidence: 99%

Green Synthesis of Silver Nanoparticles with Exceptional Colloidal Stability and its Catalytic Activity Toward Nitrophenol Reduction

Sharma

Mishra

Kumar³

et al. 2016

NANO

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Silver nanoparticles (Ag NPs) were synthesized by one-step process in the presence of kollicoat as capping, reducing and stabilizing mediator. The synthesized NPs were characterized by using FTIR, TEM, DLS, XRD, EDS and UV-Vis spectroscopy. The resulting Ag NPs had an incomparable colloidal stability against the salt addition and change of pH. The e®ect of di®erent synthesis parameters and the catalytic property of the NPs were examined.

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Biomolecule induced nanoparticle aggregation: Effect of particle size on interparticle coupling

Cited by 204 publications

References 75 publications

Electroless Deposited Gold Nanoparticles on Glass Plates as Sensors for Measuring the Dielectric Constant of Solutions

Electroless Deposited Gold Nanoparticles on Glass Plates as Sensors for Measuring the Dielectric Constant of Solutions

Nanostructured and nanopatterned gold surfaces: application to the surface-enhanced Raman spectroscopy

Green Synthesis of Silver Nanoparticles with Exceptional Colloidal Stability and its Catalytic Activity Toward Nitrophenol Reduction

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