Nanoscale Chemical and Structural Characterization of Transient Metallic Nanowires using Aberration-Corrected STEM-EELS

Eswara, Santhana; Rousseau, Olivier; Viret, M.; Kociak, Mathieu

doi:10.1021/nl204374v

Cited by 10 publications

(6 citation statements)

References 22 publications

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“…These composition dependent structural changes at the nanoscale may lead to development of new organic nanoelectronics for the two types of materials. TEM-EELS 48 mapping of the mixed material confirmed the presence of C, H, N and O as constituting atoms (Fig. 2g–j ).…”

Section: Introductionmentioning

confidence: 80%

Composition-dependent nanoelectronics of amido-phenazines: non-volatile RRAM and WORM memory devices

Maiti

Debnath

Nawaz³

et al. 2017

Sci Rep

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A metal-free three component cyclization reaction with amidation is devised for direct synthesis of DFT-designed amido-phenazine derivative bearing noncovalent gluing interactions to fabricate organic nanomaterials. Composition-dependent organic nanoelectronics for nonvolatile memory devices are discovered using mixed phenazine-stearic acid (SA) nanomaterials. We discovered simultaneous two different types of nonmagnetic and non-moisture sensitive switching resistance properties of fabricated devices utilizing mixed organic nanomaterials: (a) sample-1(8:SA = 1:3) is initially off, turning on at a threshold, but it does not turn off again with the application of any voltage, and (b) sample-2 (8:SA = 3:1) is initially off, turning on at a sharp threshold and off again by reversing the polarity. No negative differential resistance is observed in either type. These samples have different device implementations: sample-1 is attractive for write-once-read-many-times memory devices, such as novel non-editable database, archival memory, electronic voting, radio frequency identification, sample-2 is useful for resistive-switching random access memory application.

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Section: Introductionmentioning

confidence: 80%

Composition-dependent nanoelectronics of amido-phenazines: non-volatile RRAM and WORM memory devices

Maiti

Debnath

Nawaz³

et al. 2017

Sci Rep

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“…The measurements carried out in scanning mode (scanning transmission electron microscopy, STEM), lead to hyperspectral imaging of the region of interest, providing 2D images that contain one full energy‐loss spectrum at every pixel. Thus, we can obtain 2D energy maps at the characteristic plasmon resonances of single NPs and ensembles …”

mentioning

confidence: 99%

High Spatial Resolution Mapping of Localized Surface Plasmon Resonances in Single Gallium Nanoparticles

Mata

Catalán‐Gómez

Nucciarelli

et al. 2019

Small

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materials, as certain semiconductor systems, [6] have been demonstrated to show plasmonic behavior, where the plasmon resonance is achieved by the excitation of interband transitions. [7] Among metals, noble metals as gold and silver have been the most extensively studied and exploited plasmonic systems, whose response lies on the VIS-IR spectral region. However, expanding the operability range up to the UV region is highly desirable to cover further applications, [8] which requires exploring alternative plasmonic materials.Within this context, few material systems optically active at the UV, as Mg, Al, or Ga are currently catching the attention of many research groups. [9,10] The ability to obtain these materials as colloidal suspensions offers a further advantage since it allows for their easy and cheap synthesis as nanostructures. Aluminum is an attractive choice as UV plasmonic material due to its bulk plasma frequency (15 eV) and earth abundance. [11] The strong interband transitions in Al, at about 1.5 eV, damp the possible resonances at that spectral range (NIR), while the material can support LSPR below and above that region. The short wavelengths of Al resonances (typically, 150-250 nm) become comparable to the nanoparticle (NP) size, leading to the emergence of higher order LSPRs. Regarding the spectral shape, the large linewidth of Al resonances as compared to noble metals can be understood through the modified long wavelength approximation, where the radiative damping scales with the cubed oscillation frequency (ω 3 ). [12] Although much less studied until date, Mg also shows UV plasmon resonances as consequence of its bulk plasma frequency, supporting IR resonances, too, in contrast to Al. Up to three different LSPR modes have been reported for Mg hexagonal nanoplates. [9] Another alternative UV plasmonic material is gallium (Ga), having a high bulk plasmon energy, at 14 eV; [13] exhibiting strong UV LSPR due to its negative real part of the electric function along with its low imaginary part of the dielectric function. Simple synthetic procedures allow obtaining gallium nanoparticles (Ga NPs) in a cost effective way such as thermal evaporation. The plasmonic response of the synthesized Ga NPs can be tuned, for instance, as function of their size and shape. [14][15][16] Thus, Ga NPs are among the ideal candidates to spread the application range of plasmonic systems suitable, for instance, for DNA sensing. [17] Plasmonics has emerged as an attractive field driving the development of optical systems in order to control and exploit light-matter interactions. The increasing interest around plasmonic systems is pushing the research of alternative plasmonic materials, spreading the operability range from IR to UV. Within this context, gallium appears as an ideal candidate, potentially active within a broad spectral range (UV-VIS-IR), whose optical properties are scarcely reported. Importantly, the smart design of active plasmonic materials requires their characterization at high spatial and spectral resolu...

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“…It might be due to rapid damage (panel B, Figure 2 ) on their organic component-bearing surface by the strong electron-beam of TEM, high reactivity of the metal component of highly oxidation state and/or weak signal generation from the thin nanomaterial. Recently, scanning transmission electron microscope - Electron Energy Loss Spectroscopy (STEM- EELS) is emerging as a powerful tool for elemental mapping of nanomaterials 51 52 53 54 . Our EELS study for the Mn VI -NPs revealed presence of worm-like NPs (panel C, Mn only).…”

Section: Resultsmentioning

confidence: 99%

Functionalised MnVI-nanoparticles: an advanced high-valent magnetic catalyst

Khamarui

Saima

Laha

et al. 2015

Sci Rep

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We discover MnVI-nanoparticles (NPs) bearing functional groups, high oxidation state, strong electron affinity, unique redox and paramagnetic nature, which opens up a new avenue to catalysis, magnetism and material application. However, its synthesis is challenging and remains unexplored because of associated serious difficulties. A simple benign synthetic strategy is devised to fabricate the high-valent NPs using mild reducing agent bromide, which transformed MnVII to valuable MnVI-species. The EELS-imaging of individual elements, ESI-MS, XPS and other techniques established its composition as Br(Me3SiO)MnVIO2. It revealed significantly improved magnetic moment (SQUID) with isotropic hyperfine splitting of six line spectrum (EPR). The high-oxidation state and incorporated-ligands of the metals present on the active surface of the NPs led to development of a general catalytic process for oxidative heterodifunctionalisation to C-C triple bond towards formation of a new O-C/N-C/S-C and C-C coupling cum cyclisation to biologically important flavones and their aza- and marcapto-analogues, and valuable enaloxy synthons.

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Nanoscale Chemical and Structural Characterization of Transient Metallic Nanowires using Aberration-Corrected STEM-EELS

Cited by 10 publications

References 22 publications

Composition-dependent nanoelectronics of amido-phenazines: non-volatile RRAM and WORM memory devices

Composition-dependent nanoelectronics of amido-phenazines: non-volatile RRAM and WORM memory devices

High Spatial Resolution Mapping of Localized Surface Plasmon Resonances in Single Gallium Nanoparticles

Functionalised MnVI-nanoparticles: an advanced high-valent magnetic catalyst

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