Mapping the plasmon response of Ag nanoislands on graphite at 100 nm resolution with scanning probe energy loss spectroscopy

Murphy, S.; Bauer, Karl; Sloan, Peter; Lawton, James J.; Tang, Lin; Palmer, Richard E.

doi:10.7567/apex.8.126601

Cited by 8 publications

(9 citation statements)

References 21 publications

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“…In this technique, the tip of a scanning tunnel microscope is operated in the field emission mode to generate a local electron beam, which can be scattered from the surface and collected by an electron energy analyzer. Therefore, the two dimensional distribution of the electron energy spectra of the surface can be scanned 2 , 5 , 7 , 8 , which is important information for fully understanding the surface at microscale. However, the probability of the inelastic scattering of electron is usually very small, often orders of magnitude smaller than that of the elastically scattered electron.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear inelastic electron scattering from Au nanostructures induced by localized surface plasmon resonance

Liu

et al. 2018

Sci Rep

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Nonlinear electron scattering is a recently-discovered physical process observed during the localized plasmonic excitation of Ag nanostructures on graphite surface. In the present work, nonlinear electron scattering phenomena is experimentally verified on Au nanostructures by measuring inelastic scattering of electrons field-emitted from tungsten tip. The relative intensity of the electron-energy-loss peak associated with the plasmonic excitation of Au shows again to increase nonlinearly with the electric field generated by the tip-sample bias, demonstrating the generality of nonlinear electron scattering process in plasmonic system. Compared to the nonlinear electron scattering phenomena observed on Ag nanostructures, the nonlinear term for Au nanostructures is about 1 to 2 orders of magnitude smaller, which is in consistent with the field enhancement factor of Au and Ag nanostructures from both the surface-enhanced Raman spectroscopy experiments and the theoretical calculations.

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Section: Introductionmentioning

confidence: 99%

Nonlinear inelastic electron scattering from Au nanostructures induced by localized surface plasmon resonance

Liu

et al. 2018

Sci Rep

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“…Another noteworthy point is that the Ag nanostructures yield a lower backscattered electron signal than the surrounding HOPG substrate. We have recently reported on this effect in [32], which is counterintuitive as one would expect a larger electron backscattering cross-section for the element with the higher atomic number. Moreover, since the RFA was configured to suppress the secondary electron signal in these measurements, it is unlikely that variations in the work function of the surface are causing the material contrast.…”

Section: Electron Reflectivitymentioning

confidence: 77%

“…The pre-amplifier near the scan head of the STM-1 was removed and replaced by an amplifier (Femto DLPCA-200) outside the vacuum chamber to allow measurements at higher currents in FE mode using a picoammeter. This instrument has been previously used in combination with a cylindrical sector analyzer with multichannel detector to map the plasmon response of Ag nanoislands on HOPG with SPELS [32]. For the experiments described here, the analyzer has been replaced with a RFA described below.…”

Section: Spels Instrumentmentioning

confidence: 99%

“…For example, Festy and Palmer [21] demonstrated that spectroscopically resolved images of topological features on a roughened Si surface could be obtained with a lateral resolution below 50 nm. More recently, spatially resolved maps of electron energy loss spectra showing clear elemental identification and discrimination were obtained on Ag structures on graphite with a lateral resolution as low as 100 nm [26,32]. Other noteworthy configurations have produced spin-polarized [33,34], electron diffraction [35][36][37][38][39] and luminescence [40] measurements.…”

Section: Introductionmentioning

confidence: 99%

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A proximal retarding field analyzer for scanning probe energy loss spectroscopy

2017

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A compact proximal retarding field analyzer for scanning probe energy loss spectroscopy measurements is described. Using the scanning tunneling microscope (STM) tip as a field emission (FE) electron source in conjunction with this analyzer, which is placed at a glancing angle to the surface plane, FE sample current and electron reflectivity imaging may be performed simultaneously. This is demonstrated in measurements of Ag nanostructures prepared on graphite by electron-beam lithography, where a material contrast of 13% is observed, with a lateral resolution of 25 nm, between the silver and graphite in electron reflectivity images. Topological contrast mechanisms such as edge enhancement and shadowing are also observed, giving rise to additional features in the electron reflectivity images. The same instrument configuration has been used to measure electron energy loss spectra on bare graphite, where the zero loss peak, π band plasmon loss peak and secondary electron peaks are observed. Using this simple and compact analyzer an STM, with sufficient open access to the tip-sample junction, may easily be augmented to provide simultaneous elemental and topographic mapping, supplementing STM image measurements with FE sample current and electron reflectivity images, as well as electron energy loss spectroscopy measurements, in the same instrument.

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“…The film was deposited at room temperature and annealed at 700 • C for 30 min in vacuum. SPELS measurements were performed using a modified STM setup that is described elsewhere [3,4]. In SPELS, the STM tip is biased at voltages up to -400 V with respect to the sample.…”

Section: Methodsmentioning

confidence: 99%

Towards plasmon mapping of SERS-active Ag dewetted nanostructures using SPELS

Beshr

Dexter

Tierney

et al. 2022

J. Phys.: Conf. Ser.

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Thermal dewetting of silver thin flm can lead to SERS-active Ag nanoparticles. Here, we report our progress towards using scanning probe energy loss spectroscopy (SPELS) to map the plasmonic behaviour of SERS-active Ag nanoparticles (NP) by investigating NPs produced through the dewetting study of Ag thin flms on SiO2/Si and Ti/SiO2/Si substrates. The nanoparticles size and spatial distribution were controlled by the deposition and thermal annealing parameters. The results of preliminary SPELS measurements of these structures, alongside SERS data show that there is a correlation between the Raman enhancement and the nanoparticle size and interparticle spacing.

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Mapping the plasmon response of Ag nanoislands on graphite at 100 nm resolution with scanning probe energy loss spectroscopy

Cited by 8 publications

References 21 publications

Nonlinear inelastic electron scattering from Au nanostructures induced by localized surface plasmon resonance

Nonlinear inelastic electron scattering from Au nanostructures induced by localized surface plasmon resonance

A proximal retarding field analyzer for scanning probe energy loss spectroscopy

Towards plasmon mapping of SERS-active Ag dewetted nanostructures using SPELS

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