Study of inelastic mean free path of metal nanostructures using energy filtered transmission electron microscopy imaging

Ghosh, Tanmay; Bardhan, Munmun; Bhattacharya, M.; Satpati, Biswarup

doi:10.1111/jmi.12240

Cited by 6 publications

(4 citation statements)

References 25 publications

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“…Disc natures of the in-situ generated nanoparticles are clearly shown in Fig. 2(a–c) by recording their energy filtered TEM images 55 . It is clear from our energy filtered TEM image for Sample-F (of Fig.…”

Section: Resultsmentioning

confidence: 99%

Decoupled in-plane Dipole Resonance Modulated Colorimetric Assay-Based Optical Ruler for Ultra-Trace Gold (Au) Detection

Mandal

Bhattacharya

Кузнецов

et al. 2018

Sci Rep

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Decoupling of different plasmon resonance modes (in-plane, and out-of-plane dipole and quadrupole resonances) by tuning nanoparticle’s size and shape offers a new field of plasmonics as colorimetric assay-based optical-ruler for ultra-trace sensing. Driven by its low cost, easy to perform and efficient way to measure trace level (up to 30 ppt in presence of common mining elements in natural gold ore) abundance, this study develops a highly selective and ultrasensitive turn-on colorimetric sensor to detect gold-ion from environmental samples. Different level of gold-ion tracer makes size variable spherical- and disc-shaped silver nanoparticles when added to a ‘growth solution’ which results decoupling of in-plane dipole resonance from in-plane quadrupole and out-of-plane dipole resonances with a wide range of in-plane dipole plasmon tunability to generate different colors. This color-coded sensing of gold-ion shows high selectivity and ultrasensitivity over other metal ions in the ppt level with an impurity aberration limit of 1 ppm. A plausible explanation explains the possible role of catalytic gold-ion to initiate unfavorable silver ion (Ag+) reduction by ascorbic acid to generate silver nanoparticles. Proposed technology has been applied in real mining sample (Bugunda Gold Deposit, Tajikistan) to detect gold concentration from ores to find potential application in mining technology.

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Section: Resultsmentioning

confidence: 99%

Decoupled in-plane Dipole Resonance Modulated Colorimetric Assay-Based Optical Ruler for Ultra-Trace Gold (Au) Detection

Mandal

Bhattacharya

Кузнецов

et al. 2018

Sci Rep

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“…1a, inset) gives a numerical value of the relative thickness ( t λx ) of the specimen (Fig. 1c), where t is the thickness and λ x is inelastic mean-free path of the electron 40,41 . The thickness of the material can be determined by knowing λ x , which is 119 nm 40 at 300 keV.…”

Section: Structural Characterizationmentioning

confidence: 99%

Tailoring phonon modes of few-layered MoS2 by in-plane electric field

et al. 2020

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We discuss the effect of the in-plane electric field on the Raman spectroscopy for few-layered MoS 2. The characteristic Raman modes of MoS 2 show gradual red shift, while the intensity increases by 45-50% as the electric field is increased, showing a large electro-optical effect. Structural analysis suggests that our few-layered MoS 2 belongs to P6/m2 space group with broken inversion symmetry. We attribute this gradual red shift to this broken symmetry-driven piezoelectricity in MoS 2 , which generates tensile strain along the perpendicular direction when the electric field is applied. The enhancement of the effect upon reversing the electric field direction adds credence to our interpretation. Our first principal density-functional theory calculation further substantiates the claim. This optical probing of the electromechanical coupling may lead to applications as a nonextensive technique for electric field/strain sensors in the nanoelectronics devices.

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“…The thickness of the hexagonal Au NPL was evaluated using the log‐ratio method, t = λ Au ln( I t / I 0 ), where I t is the integral of the total spectrum count, I 0 is the integral of the ZLP count, and λ Au is the inelastic scattering mean free path of gold. Here, an λ Au value of 121 nm (at 300 kV) [ 41 ] was used to calculate the thickness. Since the GO sheet used for nucleation sites was very thin (about 1.1 nm [ 42 ] ), the effect of GO in EELS signal was neglected.…”

Section: Methodsmentioning

confidence: 99%

Strain‐Induced Modulation of Localized Surface Plasmon Resonance in Ultrathin Hexagonal Gold Nanoplates

et al. 2021

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Anisotropic gold nanoplates (NPLs) have raised the interesting possibility that their reduced geometrical symmetry allows fine tuning of their optical properties associated with the excitation of localized surface plasmon resonances (LSPRs). Recent developments have greatly improved LSPR tunability by utilizing the spatial distribution of LSPR modes. However, the nanoscale interplay between defect‐induced mechanical strain and the spatial variation of LSPR modes remains poorly understood. In this work, the combination of high spatial‐ and spectral‐resolution mapping of LSPR modes and nanoscale strain mapping using aberration‐corrected transmission electron microscopy are applied to investigate the nanoscale distribution of LSPR modes in an ultrathin single hexagonal gold NPL and the effect of defect‐induced strains on its LSPR properties. The electron energy‐loss spectral maps reveal four distinct LSPR components and intensity distributions of all LSPR modes in a hexagonal gold NPL. Furthermore, the strain maps provide experimental evidence that the tensile strain field induced by a Z‐shaped faulted dipole is responsible for the asymmetric distribution of LSPR intensity in a hexagonal gold NPL.

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Study of inelastic mean free path of metal nanostructures using energy filtered transmission electron microscopy imaging

Cited by 6 publications

References 25 publications

Decoupled in-plane Dipole Resonance Modulated Colorimetric Assay-Based Optical Ruler for Ultra-Trace Gold (Au) Detection

Decoupled in-plane Dipole Resonance Modulated Colorimetric Assay-Based Optical Ruler for Ultra-Trace Gold (Au) Detection

Tailoring phonon modes of few-layered MoS2 by in-plane electric field

Strain‐Induced Modulation of Localized Surface Plasmon Resonance in Ultrathin Hexagonal Gold Nanoplates

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