Cluster beam synthesis of metal and metal-oxide nanoparticles for emerging memories

Verrelli, E.; Tsoukalas, D.

doi:10.1016/j.sse.2014.06.017

Cited by 12 publications

(6 citation statements)

References 42 publications

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“…Additionally, deeper patterns require a longer transportation path within the plasma plume. Both conditions are expected to increase the size and alter the phase composition of the resulting particles which is likely to affect the topography of the resulting agglomerates on the sample surface [29,30] …”

Section: Resultsmentioning

confidence: 99%

“…Both conditions are expected to increase the size and alter the phase composition of the resulting particles which is likely to affect the topography of the resulting agglomerates on the sample surface. [29,30] In contrast, surfaces that were produced without an interference pattern (i. e. with only a single beam) show only a thin, relatively homogenous oxide layer throughout the surface. As in this case the whole surface was exposed to laser radiation the resulting particles could not agglomerate and the oxide laver stayed thin even at high fluences as can be seen in Figure 1 h.…”

Section: Morphology and Chemistry Of The Surfacesmentioning

confidence: 99%

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Single‐step Production of Photocatalytic Surfaces via Direct Laser Interference Patterning of Titanium

Fox,

Maria Delfino,

Cortés

et al. 2023

ChemNanoMat

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State of the art approaches to produce photocatalytic surfaces generally require multiple processing steps to achieve highly active surfaces. Following recent trends to facilitate the production of active surfaces, this work presents a single‐step method to create porous photocatalytic surfaces via direct laser interference patterning (DLIP) of a titanium substrate with pulses in the picosecond range. The resulting surfaces contain a variety of titanium oxides while both their composition and morphology can be controlled through the laser process parameters. This makes it possible to tailor these surfaces for specific applications such as antimicrobial surfaces, implant materials or water treatment. Surface characterization was executed by applying scanning electron microscopy complemented by focused ion beam cross‐sectioning and energy dispersive X‐ray spectroscopy as well as gracing incidence X‐ray diffractometry. The photocatalytic activity achieved by different laser parameters is assessed by methylene blue degradation under UV‐A light. As DLIP is already established in industrial applications, this approach could greatly facilitate the use of photocatalytic surfaces for water treatment or medical applications, as it does not require nanoparticle synthesis or additional coating steps.

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Section: Resultsmentioning

confidence: 99%

Section: Morphology and Chemistry Of The Surfacesmentioning

confidence: 99%

Single‐step Production of Photocatalytic Surfaces via Direct Laser Interference Patterning of Titanium

Fox,

Maria Delfino,

Cortés

et al. 2023

ChemNanoMat

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“…The NP deposition was performed using a special DC sputtering chamber (NanoGen, Mantis deposition Ltd) attached, through a small aperture, to the main chamber where the sample was located as shown in Figure , more details can be found elsewhere . The substrates used in this experiment were carbon films on copper transmission electron microscopy (TEM) grids used as received (C film of 5–6 nm on Cu grid from Electron Microscopy Sciences, type CF200‐Cu).…”

Section: Methodsmentioning

confidence: 99%

Coalescence of Cluster Beam Generated Sub‐2 nm Bare Au Nanoparticles and Analysis of Au Film Growth Parameters

et al. 2017

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In this work is presented the growth model for Au films grown on a carbon substrate at room temperature by using as building blocks Au nanoparticles (NPs) with 1.4 nm mean size generated via remote cluster beam synthesis and soft landing on the substrate. The key results highlighted in this work are that 1) the deposited nanoparticles coalesce at substrate level in such a way that the film growth is 3D, 2) newly formed nanoparticles at substrate level are predominantly magic number clusters and 3) coalescensce takes place as soon as two neighboring nanopartciles come closer than a critical distance. The film growth was investigated by TEM as a function of Au load, in the range 0-1.2 μg/cm 2 . Two distinct regimes are identified: the "landing regime" and the "coalescence regime". During the latter the film growth is 3D with a dynamic scaling exponent z of 2.13. Particular attention was devoted to the study of the evolution of the NP population from the moment they are generated with the cluster beam generator to the moment they land on the substrate and coalesce with other NPs. Our results show that 1) the NPs generated by the cluster beam are heterogeneous in size and are made by more than 95% by Au Magic numbers, mainly Au 20 and Au 55 and 2) kinetic processes (coalescence) at substrate level is capable of producing NPs populations made of larger Au magic numbers containing up to several thousands of Au atoms. Experimental and simulation results provide insight into the coalescence mechanism and provide strong evidence that the NPs coalesce when the nearest neighbor distance is below a critical mark. The critical distance is at its minimum 0.4-0.5 nm and it is still unclear whether it is constant or not although the best matching simulation results seem to point to a superlinear dependence from the NP size difference between two neighboring candidate coalescing NPs. The coalescence phenomenon investigated in this work pinpoints the unique self-organization properties of these small Au NPs in creating films with a stable edge-to-edge mean nearest neighbor distance of the order of 1.4 nm.

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“…The size and distribution of these filaments are conditional to nanograin characteristics. [ 70 ] Small ones enable the creation of multiple thin easily relocated filaments, resulting in fast current increase (Figure 5b, S10a,b, Supporting Information), susceptible to variability. However, with larger grains, thicker and stronger filaments can be shaped, leading to better dynamic range (Figure S10c,d, Supporting Information) and RS cyclability (Figure 5a, S8, Supporting Information).…”

Section: Internal Dynamicsmentioning

confidence: 99%

Inkjet‐Printed Ag/a‐TiO₂/Ag Neuromorphic Nanodevice Based on Functionalized Ink

et al. 2022

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This study aims to contribute to the burgeoning field of brain‐inspired computing by expanding it beyond conventional fabrication methods. Herein, the obstacles toward the effective inkjet printing process are encountered and the electrical characteristics are explored, providing new insights into the reliability aspects of fully printed Ag/a‐TiO2/Ag electronic synapses. The versatility of the approach is further enhanced by the highly stable in‐house‐developed a‐TiO2 ink, exhibiting optimal shelf life of five months and repeatable jetting, producing layers with nanoscale thickness resolution. Most importantly, device electrical characterization reveals synaptic dynamics, leading to activity‐dependent conductance state retention and adaptation characteristics, implying inherent learning capabilities. The synaptic dynamics are attained by solely adjusting the duty cycle of the applied pulsed voltage trigger, while keeping amplitude and polarity fixed, a method readily compatible with realistic applications. Furthermore, I–V analysis demonstrates a dynamic range dependence on a‐TiO2 layer thickness and conduction mechanism that is akin to the conventionally developed electronic TiO2 synapses. The developed devices provide a time‐ and cost‐effective ecologically benign alternative toward biomimetic signal processing for future flexible neural networks.

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Cluster beam synthesis of metal and metal-oxide nanoparticles for emerging memories

Cited by 12 publications

References 42 publications

Single‐step Production of Photocatalytic Surfaces via Direct Laser Interference Patterning of Titanium

Single‐step Production of Photocatalytic Surfaces via Direct Laser Interference Patterning of Titanium

Coalescence of Cluster Beam Generated Sub‐2 nm Bare Au Nanoparticles and Analysis of Au Film Growth Parameters

Inkjet‐Printed Ag/a‐TiO₂/Ag Neuromorphic Nanodevice Based on Functionalized Ink

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Cluster beam synthesis of metal and metal-oxide nanoparticles for emerging memories

Cited by 12 publications

References 42 publications

Single‐step Production of Photocatalytic Surfaces via Direct Laser Interference Patterning of Titanium

Single‐step Production of Photocatalytic Surfaces via Direct Laser Interference Patterning of Titanium

Coalescence of Cluster Beam Generated Sub‐2 nm Bare Au Nanoparticles and Analysis of Au Film Growth Parameters

Inkjet‐Printed Ag/a‐TiO2/Ag Neuromorphic Nanodevice Based on Functionalized Ink

Contact Info

Product

Resources

About

Inkjet‐Printed Ag/a‐TiO₂/Ag Neuromorphic Nanodevice Based on Functionalized Ink