Nanomechanical and structural study of Au38 nanocluster Langmuir-Blodgett films using bimodal atomic force microscopy and X-ray reflectivity

Swierczewski, Michal; Chennevière, Alexis; Lee, Lay-Theng; Maroni, Plinio; Bürgi, Thomas

doi:10.1016/j.jcis.2022.10.081

Cited by 4 publications

(4 citation statements)

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“…In fact, numerous surface-specific X-ray techniques (GIXD, GIXOS, GIWAXS, etc.) have proved repeatedly that the interparticle gap is established upon solvent evaporation and it is the interdomain separation that changes upon compression. ,, One of the primary targets of this feature article is to familiarize researchers with the notion that there are fundamental differences between the interactions directing the layer formation between hydrophobic NPs and long amphiphiles. In the absence of hydrogen bonds between the polar head and the subphase, multiple weaker interactions such as dispersive forces, long-range repulsion, and entropic effects are in competition.…”

Section: Discussionmentioning

confidence: 99%

“…Following the injection of the solution onto the water surface and the rapid evaporation of the volatile solvent, small crystalline domains of NPs are formed . Multiple studies employing GIXD or similar surface-sensitive X-ray techniques ,,, have shown that the same correlation peaks are often observed irrespective of the surface pressure, suggesting that the interparticle separation distance is established in the initial stages of the Langmuir experiment. Nevertheless, the crystallinity of the small domains that are formed is highly dependent on the polydispersity of the NP solution, and the interparticle separation distance depends on the thiol ligand length and its concentration on the surface of the metal core. , …”

Section: Film Evolutionmentioning

confidence: 99%

“…In its most common configuration, the tapping mode, the tip is oscillated above the sample close to the resonant frequency of the cantilever. The change in amplitude is used to obtain a topographic image of the sample while the change in phase of oscillation provides information about the tip–sample interactions including the mechanical properties. , The latter can be further elucidated from a range of nanomechanical AFM modes such as bimodal AFM − or force–distance curve measurements (nanoindentation). − …”

Section: Introductionmentioning

confidence: 99%

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Langmuir and Langmuir–Blodgett Films of Gold and Silver Nanoparticles

Swierczewski

Bürgi

2023

Langmuir

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Recently the focus of the Langmuir–Blodgett technique as a method of choice to transfer monolayers from the air/water interface onto solid substrates in a controllable fashion has been shifting toward purely hydrophobic gold and silver nanoparticles. The fundamental interactions between particles that become relevant in the absence of polar groups range from dispersive attractions from the metal cores and repulsions between ligand shells to weaker entropic factors. The layer evolution is explored, starting with interfacial self-assembly upon solution spreading and domain and circular island formation, which subsequently merge into a complete monolayer and finally form multilayers or macroscopic wrinkles. Moreover, structural properties such as the core:ligand size ratio are investigated in the context of dispersive forces, whereby the nanoparticles with small cores and long ligands tend not to aggregate sufficiently to produce continuous films, those with large cores and short ligands were found to aggregate irreversibly, and those in between the two extremes were concluded to be able to form highly organized crystalline films. Similarly, the characteristics of the spreading solution such as the concentration and the solvent type crucially influence the film crystallinity, with the deciding factor being the degree of affinity between the capping ligand and the solvent used for spreading. Finally, the most common strategies employed to enhance the mechanical stability of the metal nanoparticle films along with the recent attempts to functionalize the particles in attempts to improve their applicability in the industry are summarized and evaluated in relation to their future prospects. One of the objectives of this feature article is to elucidate the differences between hydrophobic metal nanoparticles and typical amphiphilic molecules that the majority of the literature in the field describes and to familiarize the reader with the knowledge required to design Langmuir–Blodgett nanoparticle systems as well as the strategies to improve existing ones.

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Section: Discussionmentioning

confidence: 99%

Section: Film Evolutionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Langmuir and Langmuir–Blodgett Films of Gold and Silver Nanoparticles

Swierczewski

Bürgi

2023

Langmuir

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“…The bimodal AM–FM configuration has been successfully applied to map nanomechanical properties in a variety of materials which include polymers, 34–38 nanocomposites, 39 self-assembled monolayers, 40 Langmuir–Blodgett films, 41 proteins, 33,42 graphite 43 and 2D materials. 44 It has provided maps of the elastic modulus with angstrom-scale resolution.…”

Section: Theory Of Bimodal Afm For Van Der Waals Forcesmentioning

confidence: 99%

Fast and high-resolution mapping of van der Waals forces of 2D materials interfaces with bimodal AFM

Gisbert,

Garcia

2023

Nanoscale

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Automatic Generation of Contrast Maps in Terms of van der Waals Material Properties in Bimodal AFM

Santos,

Elsherbiny,

Lai

et al. 2024

J. Phys. Chem. C

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van der Waals (vdW) forces are of interest in colloid science, biophysics, cell biology, and the field of vdW heterostructures. We present a model and method to quantify vdW material properties of samples routinely in standard bimodal atomic force microscopy (AFM) without the need to establish mechanical contact with the samples. The method preserves the high resolution of bimodal AFM but enhances contrast by exploiting several transforms that lead to the production of contrast maps in the form of vdW material properties, i.e., Hamaker constant, adhesion, surface energy, peak forces, and surface energy hysteresis. We show that some of these maps provide information that is otherwise concealed in the raw channels.

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Nanomechanical and structural study of Au38 nanocluster Langmuir-Blodgett films using bimodal atomic force microscopy and X-ray reflectivity

Cited by 4 publications

References 39 publications

Langmuir and Langmuir–Blodgett Films of Gold and Silver Nanoparticles

Langmuir and Langmuir–Blodgett Films of Gold and Silver Nanoparticles

Fast and high-resolution mapping of van der Waals forces of 2D materials interfaces with bimodal AFM

Automatic Generation of Contrast Maps in Terms of van der Waals Material Properties in Bimodal AFM

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