Pulsed laser deposition of polymer–metal nanocomposites

Schlenkrich, Felix; Seyffarth, Susanne; Fuchs, Britta; Krebs, Hans‐Ulrich

doi:10.1016/j.apsusc.2010.10.073

Cited by 13 publications

(3 citation statements)

References 11 publications

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“…Multilayer thin films of metals and polymers found their way into a variety of applications and are a prominent research field for further improvement [1][2][3][4]. Especially, the totally different material properties of the two components allow tuning of optical, mechanical, electrical and acoustic characteristics [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Confinement of phonon propagation in laser deposited tungsten/polycarbonate multilayers

et al. 2016

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Nanoscale multilayer thin films of W and PC (Polycarbonate) show, due to the great difference of the components' characteristics, fascinating properties for a variety of possible applications and provide an interesting research field, but are hard to fabricate with low layer thicknesses. Because of the great acoustic mismatch between the two materials, such nanoscale structures are promising candidates for new phononic materials, where phonon propagation is strongly reduced. In this article we show for the first time that W/PC-multilayers can indeed be grown with high quality by pulsed laser deposition. We analyzed the polymer properties depending on the laser fluence used for deposition, which enabled us to find best experimental conditions for the fabrication of high-acoustic-mismatch W/PC multilayers. The multilayers were analyzed by fs pump-probe spectroscopy showing that phonon dynamics on the ps time-scale can strongly be tailored by structural design. While already periodic multilayers exhibit strong phonon localization, especially aperiodic structures present outstandingly low phonon propagation properties making such 1D-layered W/PC nano-structures interesting for new phononic applications.

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Section: Introductionmentioning

confidence: 99%

Confinement of phonon propagation in laser deposited tungsten/polycarbonate multilayers

et al. 2016

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“…In case of structural glass-formers, the molecules or atoms of the material are arranged in a way that allows for short-range order, but it is elusive of long-range order [38]. The preparation techniques to obtain amorphous materials are numerous, among them sputtering [156], pulsed laser deposition [123], and melt quenching [75]. The melt quenching technique can be applied to prepare samples of bulk metallic glass.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear response and avalanche behavior in metallic glasses

Riechers

Samwer

2017

Eur. Phys. J. Spec. Top.

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The response to dierent stress amplitudes at temperatures below the glass transition temperature is analyzed by mechanical oscillatory excitation of Pd 40 Ni 40 P 20 metallic glass samples in single cantilever bending geometry. The strain response of the material is well below the critical yield stress even for highest stress amplitudes, implying the expectation of a linear relation between stress and strain according to Hook's Law. However, a deviation from the linear behavior is evident, which is evaluated in terms of temperature dependence and inuence of the applied stress amplitude by two dierent approaches of evaluation. The nonlinear approach is based on a nonlinear expansion of the stress-strain-relation, assuming an intrinsic nonlinear character of the shear or elastic modulus. The degree of nonlinearity is extracted by a period-by-period Fourier-analysis and connected to nonlinear coecients, describing the intensity of nonlinearity at the fundamental and higher harmonic frequencies. While rather small stress amplitudes are connected to a linear response behavior, higher stress amplitudes result in nonlinear behavior, which is enhanced with increasing temperature. The characteristic timescale to adapt to a signicant change in stress amplitude in terms of a recovery timescale to a steady state value is connected to the structural relaxation time of the material, suggesting a connection between the observed nonlinearity and primary relaxation processes. The second approach of evaluation is termed the incremental analysis and relates the observed response behavior to avalanches, which occur due to the activation and correlation of local microstructural rearrangements consisting of a few tens of atoms. These rearrangements are termed as shear transformation zones and correspond to localized plastic events, which are superimposed on the linear response behavior of the material. Temperature and stress enhance the occurrence of intervals of monotonously increasing or decreasing strain. These are connected to avalanche behavior according to the power-law observed in the distributions of strain response. Despite the onset of nonlinearity observed in connection with the nonlinear analysis, the power-law behavior is extracted for all applied stress amplitudes, high and low, suggesting activated plastic events throughout the so called Hookean response regime. The intensity of strain response itself shows a direct relation to the strain rate of the experiment. Both approaches of evaluation are compared regarding common aspects and limits. Response phenomena connected to plastic events in the linear response regime are barely reported in literature even though their existence is implied. The incremental analysis yields experimental evidence supporting their occurrence. Moreover it reects the limits of the nonlinear approach, which neglects strain response on the small scale by the period-wise analysis of the data, resulting in an apparent linear strain response. Still, the nonlinear approach illustrates clearl...

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“…Glasses can be formed by different experimental techniques, such as sputtering deposition 3 , laser deposition 4 or melt quenching 5 . Regardless of the differences among these techniques, the common goal of all of them is to avoid long range ordering during the formation of the solid.…”

Section: Introductionmentioning

confidence: 99%

Avalanche Dynamics and Magnetoelastic Coupling in Metallic Glasses

Gómez¹

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B Evaluation of W as fragility estimator……………………………………………...141 C Magnetic domains in ribbons under tensile loading……………………......142 Literature………………………………………………………………………………………...145 List of figures……………………………………………………………………………..…….155

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Pulsed laser deposition of polymer–metal nanocomposites

Cited by 13 publications

References 11 publications

Confinement of phonon propagation in laser deposited tungsten/polycarbonate multilayers

Confinement of phonon propagation in laser deposited tungsten/polycarbonate multilayers

Nonlinear response and avalanche behavior in metallic glasses

Avalanche Dynamics and Magnetoelastic Coupling in Metallic Glasses

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