Competing processes during the production of metal nanoparticles by pulsed laser deposition

Gonzalo, J.; Perea, Á.; Babonneau, David; Afonso, Carmen N.; Beer, Natalie; Barnes, Jean‐Paul; Petford‐Long, Amanda K.; Hole, D.E.; Townsend, P. D.

doi:10.1103/physrevb.71.125420

Cited by 68 publications

(92 citation statements)

References 29 publications

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“…24 For the characteristic kinetic energies applicable to these experiments (which have been reported to be !3.0 eV in similar experimental conditions), 14 the preferential orientation of the crystallites is a manifestation of a minimum in the configuration energy, as (111) surfaces have the closest packing in the face centered cubic structure adopted by gold.…”

Section: Discussionmentioning

confidence: 99%

“…These differences can be explained in relation to the nucleation processes of the laser ablated species that take place on the substrate. In fact, it has been proposed 14,28,29 that defects created during layer growth by the high energetic plasma species reaching the substrate are responsible of the nucleation process. At the initial state of deposition, the dominating island-like growth results in small coverage of the surface area by clusters.…”

Section: Discussionmentioning

confidence: 99%

“…Self-sputtered processes are also thought to be responsible of the evolution of the nanoparticle size. 14 The presence of overimposed aggregates in the case of gold layers fabricated with a larger number of pulses (!12 000) can be explained by taking into account in this case the ejection mechanism. This is dominated by explosive boiling of the target material, 10-13 a phenomenon which is described as an explosive relaxation of the laser induced melt into a coexistent mixture of liquid droplets and vapor.…”

Section: Discussionmentioning

confidence: 99%

“…[8][9][10][11][12][13] This technique also offers the capability for producing epitaxial growth, and it has extensively been applied to produce metal nanoparticles. 14 Mechanical biosensors are based on the principle that molecular recognition on the surface of a bio-functionalized micromechanical system (e.g., a cantilever) can result in a bending (deflection) of a few nanometers. The origin of the nanomechanical response is the change of the surface stress due to electrostatic, van der Waals, and steric intermolecular interactions on the cantilever surface.…”

Section: Introductionmentioning

confidence: 99%

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Gold coating of micromechanical DNA biosensors by pulsed laser deposition

Rebollar

Sanz

Esteves³

et al. 2012

Journal of Applied Physics

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Low-temperature indium-bonded alkali vapor cell for chip-scale atomic clocks J. Appl. Phys. 113, 064501 (2013) Multi-layered dielectric cladding plasmonic microdisk resonator filter and coupler Phys. Plasmas 20, 020701 (2013) Micromachined piezoelectric microphones with in-plane directivity Appl. Phys. Lett. 102, 054109 (2013) Referee acknowledgment for 2012 Biomicrofluidics 7, 010201 (2013) Introducing a well-ordered volume porosity in 3-dimensional gold microcantilevers Appl. Phys. Lett. 102, 053501 (2013) Additional information on J. Appl. Phys. In this work, we describe the gold-coating of silicon microcantilever sensors by pulsed laser deposition (PLD) and their performance as DNA biosensors. To test optimum deposition conditions for coating the sensors, silicon substrates were gold coated by PLD using the fifth harmonic of a Nd:YAG laser (213 nm, pulse duration 15 ns). The gold deposits were characterized by atomic force microscopy and x-ray diffraction. The adequate conditions were selected for coating the sensors with a 20 nm thick gold layer and subsequently functionalized with a selfassembled monolayer of thiolated DNA. To verify PLD as a tool for gold coating of biomechanical sensors, they were characterized by using a scanning laser analyzer platform. Characterization consisted in the measurement of the differential stress of the cantilevers upon hydration forces before and after functionalization with a double-stranded DNA monolayer. The measurements showed that the sensor surface stress induced by the adsorption of water molecules is approximately seven times higher than that of functionalized sensors gold coated by thermal evaporation. These results indicate that gold coating by PLD could be an advantageous method to enhance the response of biomechanical sensors based on gold-thiol chemistry. V C 2012 American Institute of Physics. [http://dx

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Gold coating of micromechanical DNA biosensors by pulsed laser deposition

Rebollar

Sanz

Esteves³

et al. 2012

Journal of Applied Physics

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“…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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Surface wave propagation in an elastic laser‐excited half‐space with small‐scale effects

Mirzade

2013

Physica Status Solidi (b)

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The propagation of Rayleigh waves in an isotopic elastic half‐space with small length scale effects whose surface is free from stress and subjected to laser irradiation is investigated. Using the nonlocal form of constitutive equations the balance of moment and laser‐induced defect‐concentration field equations are obtained. The frequency equation that governs the Rayleigh surface wave propagation in the considered medium has been derived. It is observed that the waves are dispersive in nature and that the dispersion is caused by the atomic defect generation. An approximate procedure is applied to obtain explicit expressions for phase velocity and attenuation (amplification) coefficients which characterize surface waves. It is shown that if the pump parameter is above the critical value, due to concentration–elastic instability coupled strain‐defect nanosized ordered structures on the surface of solids arises. The period of these structures is proportional to the characteristic length of defect‐atom interaction and increases with the increase of the temperature of the medium.

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Competing processes during the production of metal nanoparticles by pulsed laser deposition

Cited by 68 publications

References 29 publications

Gold coating of micromechanical DNA biosensors by pulsed laser deposition

Gold coating of micromechanical DNA biosensors by pulsed laser deposition

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

Surface wave propagation in an elastic laser‐excited half‐space with small‐scale effects

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