Combinatorial investigation of the isolated nanoparticle to coalescent layer transition in a gradient sputtered gold nanoparticle layer on top of polystyrene

Roth, Stephan V.; Walter, H.; Burghammer, Manfred; Riekel, Christian; Lengeler, B.; Schroer, Christian G.; Kuhlmann, Marion; Walther, T.; Sehrbrock, A.; Domnick, R.; Müller‐Buschbaum, Peter

doi:10.1063/1.2161926

Cited by 48 publications

(68 citation statements)

References 17 publications

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“…Previous measurements performed on sput- tered gold thin films have shown that it is possible to resolve the scattering form factor of such particles and to characterize their structural correlations. 36 Figure 5͑c͒ is the image showing the 2D GISAXS pattern recorded during this experiment. One clearly sees the very strong wings developing in the q y direction in the scattering pattern.…”

Section: Injection Of Gold Nanoparticlesmentioning

confidence: 99%

Flow at interfaces: A new device for x-ray surface scattering investigations

Moulin

Roth²,

Müller‐Buschbaum

2008

Review of Scientific Instruments

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A fluidic cell based setup is described which allows for microbeam grazing incidence small angle x-ray scattering characterization of the interface between a solid substrate and a flowing liquid. This cell can potentially be used to study in situ a wide variety of systems ranging from synthetic and natural colloids to biological molecules. The selected channel geometry enables the characterization of the solid-liquid interface during mixing of different solutions. As a proof of concept, measurements on an aqueous gold nanoparticle solution in contact with a glass surface are presented that show that the structure at the interface can be probed during flow.

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Section: Injection Of Gold Nanoparticlesmentioning

confidence: 99%

Flow at interfaces: A new device for x-ray surface scattering investigations

Moulin

Roth²,

Müller‐Buschbaum

2008

Review of Scientific Instruments

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mentioning

confidence: 70%

“…The angle of incidence was ␣ i = 0.543°. The resulting footprint on the sample of 0.3ϫ 32 m 2 reduced the beam size compared to previous microbeam and submicrobeam GISAXS experiments 5,6 up to a factor of 10.The samples consisted of commercial unconjugated colloidal gold solutions of 2 nm particle size ͑Kisker Biotechnologie͒. Gold nanoparticles are inert and provide strong scattering contrast to the solvent ͑water͒.…”

mentioning

confidence: 99%

“…Grazing incidence small angle x-ray scattering 5,6 ͑GISAXS͒ has proven to be a well suited technique for realtime studies. Here, the x-ray beam impinges under a small angle ␣ i Ͻ 1°on to the sample surface.…”

mentioning

confidence: 99%

“…The 2D nano-GISAXS signal at a sample-to-detector distance L SD = 0.809 m is decomposed in two components. The so-called detector cut 5,6 shown in Fig. 2͑a͒ probes the intensity distribution as a function of scattering vector component q z ͑vertical to the sample surface͒.…”

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confidence: 99%

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In situ observation of nanoparticle ordering at the air-water-substrate boundary in colloidal solutions using x-ray nanobeams

Roth¹,

Autenrieth²,

Grübel³

et al. 2007

Applied Physics Letters

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The nanoscale structuring during evaporation of a droplet consisting of an aqueous colloidal solution of 2 nm gold nanoparticles in water on a silicon substrate is followed in real time. The authors investigated the transfer of lateral order and vertical layering as a function of time at the three-phase contact line air-solution substrate combining a nanometer-sized x-ray beam with a grazing incidence geometry. A pronounced retardation of vertical ordering is observed with respect to lateral ordering. While individual layers are deposited during evaporation of the solvent, the growth parallel to the substrate shows a strongly nondiffusive behavior. © 2007 American Institute of Physics. ͓DOI: 10.1063/1.2776850͔Large-scale arrays of ordered nanoparticles are fascinating materials for science and technology, e.g., data storage 1 or DNA sensoring, 2 due to their distinct optical properties. [2][3][4] To deposit the nanoparticle layer on top of the substrate, several methods are available, e.g., vacuum deposition 1,5 and solution casting. Solution casting allows nanostructuring of large-area two-dimensional ͑2D͒ thin films with specific morphology, offering the possibility to design 2D or threedimensional photonic crystals. This method is especially important and applicable in the field of colloidal particles, as colloidal particles are often suspended in aqueous solutions.Nanostructuring, however, is a very complex process involving several mechanisms. 6 The solvent evaporates and increases the concentration of the colloidal particles. The increased evaporation near the contact line drives a convective flow within the drop that transports material toward the periphery. 7 Additionally, an increased solute concentration and a decreased temperature near the three-phase contact line ͑TPCL͒ may trigger solutal 8 and thermocapillary 9 Marangoni flows. Furthermore, the interaction with the substrate 10 and transversal contact line instabilities 11 have to be taken into account. Finally, capillary forces come into play as soon as the solution film has a comparable thickness as the colloidal particles' diameter. 12 Previous studies addressed the ordering of nanoparticles at the liquid-air interface. 13 However, for technical applications it is of great importance to transfer this order to a solid substrate. 14 The interaction with the substrate allows for tuning the arrangement of the nanoparticles and thus the layers' optical properties. Hence, it is only natural to investigate in situ the evolution of ordering at the TPCL liquid-air substrate.Grazing incidence small angle x-ray scattering 5,6 ͑GISAXS͒ has proven to be a well suited technique for realtime studies. Here, the x-ray beam impinges under a small angle ␣ i Ͻ 1°on to the sample surface. 6 We combined a nanobeam small angle x-ray scattering ͑nano-SAXS͒ geometry of ID13 /ESRF with a grazing incidence setup, allowing for nanobeam-grazing incidence small angle x-ray scattering ͑nano-GISAXS͒ experiments. We used the extremely brilliant 300 nm size beam ͑full width at h...

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Polymer‐Coated PtCo Nanoparticles Deposited on Diblock Copolymer Templates: Chemical Selectivity versus Topographical Effects

et al. 2014

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Metal-polymer hybrid films are prepared by deposition of polymer-coated PtCo nanoparticles onto block copolymer templates. For templating, a thin film of the lamella-forming diblock copolymer poly(styrene-b-methyl methacrylate) P(S-b-MMA) is chemically etched and a topographical surface relief with 3 nm height difference is created. Two types of polymer-grafted PtCo nanoparticles are compared to explore the impact of chemical selectivity versus the topographical effect of the nanotemplate. A preferable wetting of the polystyrene (PS) domains with poly(styrenesulfonate) (PSS)-coated PtCo nanoparticles (instead of residing in the space between the domains) is observed. Our investigation reveals that the interaction between PSS-coated nanoparticles and PS domains dominates over the topographical effects of the polymer surface. In contrast, a non-selective deposition of poly(N-vinyl-2-pyrrolidone) (PVP)-coated PtCo nanoparticles and the formation of large metal-particle aggregates on the film is observed.

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Combinatorial investigation of the isolated nanoparticle to coalescent layer transition in a gradient sputtered gold nanoparticle layer on top of polystyrene

Cited by 48 publications

References 17 publications

Flow at interfaces: A new device for x-ray surface scattering investigations

Flow at interfaces: A new device for x-ray surface scattering investigations

In situ observation of nanoparticle ordering at the air-water-substrate boundary in colloidal solutions using x-ray nanobeams

Polymer‐Coated PtCo Nanoparticles Deposited on Diblock Copolymer Templates: Chemical Selectivity versus Topographical Effects

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