Sharpening the shape distribution of gold nanoparticles by laser irradiation

Resta, Vincenzo; Siegel, J.; Bonse, Jörn; Gonzalo, J.; Afonso, Carmen N.; Piscopiello, E.; Tenedeloo, G. Van

doi:10.1063/1.2358822

Cited by 37 publications

(26 citation statements)

References 14 publications

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“…Silver nanoparticles were deposited by pulsed laser deposition (PLD) technique [22] with Ag target using a Q-switched Nd:YAG laser, at a laser energy density of 6 J/cm 2 at 532 nm, having a pulse width of 7 ns with a repetition frequency of 10 Hz. The target was rotated with constant speed to ensure uniform ablation.…”

Section: Methodsmentioning

confidence: 99%

Uniformity analysis in nanocrystalline silver thin films using fuzzy inference system

John

Nair

Gopchandran

et al. 2014

Surf. Interface Anal.

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An automatic and efficient technique to analyze the uniformity of nanoscale images using wavelets, feature similarity index measure (FSIM) and fuzzy inference system is reported. It has been successfully tested on scanning electron micrographs of nanocrystalline silver thin films. Thin films are prepared using on-axis and off-axis pulse laser deposition (PLD) technique. It is found that the film prepared using on-axis PLD is more uniformly distributed and has smoother texture compared with that of the off-axis technique. In order to analyze the images quantitatively, they are transformed to the wavelet domain to extract the localized frequency variations and a uniformity measure is derived using a fuzzy inference system for quantitatively analyzing the uniformity of each image. The surface plot of the FSIM values of the image is found to be an efficient tool for nanoscientists to evaluate the smoothness of the thin film surfaces. This study is expected to help the nanoscientists to understand these nanostructures in detail.

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Section: Methodsmentioning

confidence: 99%

Uniformity analysis in nanocrystalline silver thin films using fuzzy inference system

John

Nair

Gopchandran

et al. 2014

Surf. Interface Anal.

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“…Therefore, this constitutes a simple, fast, all-optical real-time methodology for controllable tailoring of the MNP-coated fiber active area. It should be noted that pulsed laser interaction with MNPs has been exploited in the past to tailor the size or the shape of the MNPs in colloids [29][30][31] or on planar substrates [32]. However, to the best of our knowledge, this work is the first demonstration of laser treatment applied on MNPs immobilized on OFS, and thus, we expect that its simplicity and versatility will extend the applicability SPR-OFS in sensing devices.…”

Section: Introductionmentioning

confidence: 91%

Tailored Aggregate-Free Au Nanoparticle Decorations with Sharp Plasmonic Peaks on a U-Type Optical Fiber Sensor by Nanosecond Laser Irradiation

et al. 2016

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A novel experimental methodology is presented for fabricating U-shaped optical fiber probes decorated with aggregate-free Au nanoparticles exhibiting sharp localized surface plasmon resonance (LSPR) spectra. The U-type tip is coated with gold nanoparticles (AuNPs) using a simple and time-efficient dip-coating procedure, without initially taking any care to prevent the formation of nanoparticle aggregates in the coated area. In a second step, the coating was irradiated with a few tens of laser pulses of 5-ns duration at 532 nm with intensities in the range of 2-14 MW/cm 2 , leading to the formation of aggregate-free LSPR optical fiber probes. The process was monitored and controlled in real time through the changes induced into the fiber's extinction spectra by the laser irradiation, and the coated fibers were characterized by electron microscopy. The proposed methodology resulted into the fabrication of U-type optical fiber probes coated with AuNPs exhibiting a sharp plasmon peak, which is a perquisite for their application as sensing devices.

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“…One direct and powerful technique is transition electron microscopy (TEM) [15,[28][29][30][31][32][33][34][35][36][37]40], but TEM suffers from the fact that sample preparation for three-dimensional TEM investigations is rather complicated and cannot be easily accomplished in situ. In addition, obtaining sufficient statistical data from TEM measurements is extremely time consuming.…”

Section: Introductionmentioning

confidence: 99%

“…Different techniques are employed to characterize the particle morphology [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Determination of Morphological Parameters of Supported Gold Nanoparticles: Comparison of AFM Combined with Optical Spectroscopy and Theoretical Modeling versus TEM

2012

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The morphology of small gold particles prepared by Volmer-Weber growth on sapphire substrates have been investigated by two different characterization techniques. First, by non-extensive atomic force microscopy (AFM) in combination with optical spectroscopy and modeling of the optical properties using a theoretical model, recently developed in our group. Second, by extensive transmission electron microscopy (TEM). Comparing the results obtained with both techniques demonstrate that for small gold nanoparticles within the quasistatic limit, the morphological properties can be precisely determined by an appropriate theoretical modeling of the optical properties in combination with simple AFM measurements. The apparent mean axial ratio of the nanoparticles, i.e., the axial ratio that corresponds to the center frequency of the ensemble plasmon resonance, is obtained easily from the extinction spectrum. The mean size is determined by the nanoparticle number density and the amount of deposited material, measured by AFM and a quartz micro balance, respectively. To extract the most probable axial ratio of the nanoparticle ensemble, i.e., the axial ratio that corresponds to the most probable nanoparticle size in the ensemble, we apply the new theoretical model, which allows to extract the functional dependence of the nanoparticle shape on its size. The morphological parameters obtained with this procedure will be afterwards compared to extensive TEM measurements. The results obtained with both techniques yield excellent agreement. For example, the lateral dimensions of the nanoparticles after deposition of 15.2 × 10 15 atoms/cm 2 of gold has been compared. While a mean lateral diameter of (13 ± 2) nm has been extracted from AFM, optical spectroscopy and modeling, a value of (12 ± 2) nm is derived from TEM.

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Sharpening the shape distribution of gold nanoparticles by laser irradiation

Cited by 37 publications

References 14 publications

Uniformity analysis in nanocrystalline silver thin films using fuzzy inference system

Uniformity analysis in nanocrystalline silver thin films using fuzzy inference system

Tailored Aggregate-Free Au Nanoparticle Decorations with Sharp Plasmonic Peaks on a U-Type Optical Fiber Sensor by Nanosecond Laser Irradiation

Determination of Morphological Parameters of Supported Gold Nanoparticles: Comparison of AFM Combined with Optical Spectroscopy and Theoretical Modeling versus TEM

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