Two-Dimensional Dynamics of Metal Nanoparticles on the Surface of Thin Polymer Films Studied with Coherent X Rays

Streit, S.; Gutt, Christian; Chamard, Virginie; Robert, Aymeric; Sprung, Michael; Sternemann, H.; Tolan, Metin

doi:10.1103/physrevlett.98.047801

Cited by 24 publications

(14 citation statements)

References 19 publications

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“…A comprehensive review of the GISAXS technique for studying surface structures was recently done by Renaud et al 8 Given the high beam brilliance and intensity from synchrotron x-ray sources, it is feasible to investigate the kinetics and dynamics in thin films and at surfaces when GISAXS is integrated with time-resolved techniques. With these advantages, GISAXS has been applied to a variety of systems, such as nanostructured polymer thin films, [9][10][11][12][13][14][15][16][17][18] nanoparticle-polymer composites, 5,6,[19][20][21] and supported nanoislands. [22][23][24][25][26][27][28] Due to the complex data processing involving the distorted-wave Born approximation (DWBA), GISAXS analyses in early days were often performed in a qualitative manner, where only scattering peak positions and widths are identified.…”

Section: -7mentioning

confidence: 99%

Waveguide-enhanced grazing-incidence small-angle x-ray scattering of buried nanostructures in thin films

et al. 2011

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X-ray standing waves (XSW) generated by the interference of the scattered x-rays from parallel surfaces of a thin film, the so-called waveguide effect, can be used to enhance the scatterings from certain depths of the film. Used in combination with grazing-incidence small-angle x-ray scattering (GISAXS), this resonance effect provides depth sensitivity to extract buried structures in thin films of polymer and polymer/nanoparticle nanocomposite, which are not readily accessible by most surface techniques, such as scanning probe microscopy. We developed a rigorous theory of the diffuse scattering in the framework of the distorted-wave Born approximation (DWBA) using a discretization method analogous to Parratt's recursive formalism. In such a case, the distortion of the electric field of the unperturbed state from the nanostructures of interest is considered in a selfconsistent manner. This theory allows a quantitative determination of the buried nanostructures when the x-ray waveguide enhancement is present or the size of the nanostructures of interest is comparable to or larger than the spatial frequency of electric field intensity distribution. A unique capability afforded by this theory is that a nanometer or even subnanometer spatial resolution can be achieved in the depth information of the buried nanostructures.

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Section: -7mentioning

confidence: 99%

Waveguide-enhanced grazing-incidence small-angle x-ray scattering of buried nanostructures in thin films

et al. 2011

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“…[26] where gold particles moving in a polystyrene film were investigated by XPCS. In figure 5, the relaxation times measured at q=0.09 nm -1 as a function of temperature are shown in an Arrhenius plot and compared to analogous data for pure PA4.…”

Section: Thermal Equilibriummentioning

confidence: 99%

Microscopic dynamics in nanocomposite photosensitive films studied by X-ray photon correlation spectroscopy

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Cristofolini

Fontana

et al. 2011

Philosophical Magazine

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“…"aging"). In recent papers [37,38] XPCS was used to measure the dynamic structure factor of gold nanoparticles moving on the surface of thin polymer films. Above the glass transition of the polymer a stretched or compressed KWW behaviour of the correlation functions was observed depending on the thermal history of the sample.…”

Section: Introductionmentioning

confidence: 99%

Slow dynamics in an azopolymer molecular layer studied by x-ray photon correlation spectroscopy

et al. 2010

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We report the results of X-ray photon correlation spectroscopy (XPCS) experiments on Langmuir Blodgett multilayers of a photosensitive azo-polymer. Time correlation functions have been measured at different temperatures and momentum transfers (q) and under different illumination conditions (darkness, UV or visible). The correlation functions are well described by the Kohlrausch-Williams-Watts (KWW) form with relaxation times that are proportional to q -1 , which in other systems have been explained in terms of intermittent rearrangements [L. Cipelletti et al., Phys. Rev. Lett. 84, 2275-2278] or random dipolar interactions within an elastic medium [J.-P. Bouchaud and E. Pitard, Eur. Phys. J. E 6, 231-236 (2001)]. The characteristic relaxation times follow the well known Vogel-Fulcher-Tammann law describing the temperature dependence of the bulk viscosity of this polymer. UV photoperturbation accelerates the relaxation dynamics, in qualitative agreement with the fluidification effect of UV photo-perturbation previously observed by surface rheometry, and is used to drive the system out of equilibrium. Transient dynamics is characterized, by the variance  of the two-times correlation functions. A clear peak in  appears at a well defined time  C which scales with q -1 and with the ageing time, in a similar fashion as previously reported in colloidal suspensions [O. Dauchot et al., Phys. Rev. Lett. 95, 265701 (2005)]. From an accurate analysis of the correlation functions we could demonstrate a temperature dependent cross-over from KWW compressed to simple exponential behaviour, which is modified by the fluidification due to the optical pumping of the cis-trans isomerisation of the side-chain azobenzene group.

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Two-Dimensional Dynamics of Metal Nanoparticles on the Surface of Thin Polymer Films Studied with Coherent X Rays

Cited by 24 publications

References 19 publications

Waveguide-enhanced grazing-incidence small-angle x-ray scattering of buried nanostructures in thin films

Waveguide-enhanced grazing-incidence small-angle x-ray scattering of buried nanostructures in thin films

Microscopic dynamics in nanocomposite photosensitive films studied by X-ray photon correlation spectroscopy

Slow dynamics in an azopolymer molecular layer studied by x-ray photon correlation spectroscopy

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