Inelastic Electron Tunneling Spectroscopy

Hansma, Paul K.

doi:10.1007/978-1-4684-8759-6_4

Cited by 5 publications

(2 citation statements)

References 86 publications

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“…The choice of benzoic acid monolayers is motivated by several reasons. First, various aromatic carboxylic acid monolayers have been studied by IETS, − IR spectroscopy, , and Kelvin probe microscopy. , Collectively these measurements show that carboxylic acid absorbs as a carboxylate to the aluminum oxide surface with the plane of the ring largely perpendicular to the surface, such that the para-position of the aromatic ring points away from the surface. Second, by changing the para-substituent we can systematically control the atom in contact with the top metal.…”

Section: Introductionmentioning

confidence: 99%

Steric Inhibition of Metal Penetration in the Fabrication of Metal/Molecule Contacts

2014

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Tunneling spectroscopy was used to characterize a series of junctions with para-substituted (SH, F, Cl, Br, and I) benzoic acid monolayers positioned between aluminum/aluminum oxide surfaces and Pb electrodes. The tunneling conductance spectra revealed several effects that can be attributed to the size and reactivity of the para-substituent. First, as the size of the halogen substituent increased from fluoro to iodo, the extent of Pb penetration through the monolayer to the substrate was diminished. The extent of penetration was observed as a shift in the conductance minimum toward higher bias voltage. In the case of the 4-fluoro substituent, there was significant penetration of Pb to the bottom interface, and the conductance minimum was observed near 140 mV. In the case of the 4-iodo substituent, there was minimal Pb penetration, and the conductance minimum was ∼20 mV. Second, when the para-substituent was a thiol group, the deposition of lead results in Pb−S bond formation, which was confirmed by the absence of the S−H stretching mode in inelastic tunneling spectroscopy. The effect of Pb−S bond formation was to inhibit Pb penetration and invert the barrier height, which resulted in a shift in the minimum conductance to a negative bias. These results highlight the importance of tunneling spectroscopy to better understand contacting details at the metal−molecule interface.

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Section: Introductionmentioning

confidence: 99%

Steric Inhibition of Metal Penetration in the Fabrication of Metal/Molecule Contacts

2014

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“…The fitting with the Gaussian function (blue curve in Figure ) revealed that both the peak and dip show the full width at the half maximum (FWHM) of 64 mV. It is well known that the FWHM of the IETS peak is given by the following formula: − where V m , k , T , e , and W represent modulation voltage, Boltzmann constant, temperature, charge of an electron, and intrinsic width, respectively. By using eq with the FWHM of 64 mV, the intrinsic width of the signals at ±118 mV is calculated to be 45 mV, which is far larger than the general intrinsic width of a single vibrational mode (∼a few mV). ,, According to the previous theoretical study, various vibrational modes appear between 80 and 130 meV for an isolated FePc molecule .…”

Section: Resultsmentioning

confidence: 99%

Scanning Tunneling Microscopy-Based Inelastic Electron Tunneling Spectroscopy Study of the FePc 2D Lattice on Au(111) at 77 K

et al. 2022

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We present a study of the localized vibrational property in a two-dimensional (2D) lattice of self-assembled iron(II) phthalocyanine (FePc) on Au(111) by scanning tunneling microscopy (STM)-based inelastic electron tunneling spectroscopy (IETS) at 77 K. The STM images clearly illustrate the adsorption configurations of both the first and second monolayers (MLs). The IETS signal of the FePc at the first ML of FePc lattice is suppressed by the interaction with the Au substrate. The IETS spectra for the molecules at the second ML differ depending on the adsorption configuration; the molecules inside the 2D lattice, which are strongly tilted from the surface normal, show a set of peaks and dips attributed to out-of-plane vibration modes. In contrast, the less tilted molecules at the edge do not show IETS signals. This study demonstrates that the STM-IETS is still sensitive for the local vibrational properties at 77 K.

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Vibrational Spectroscopy of Supported Metal Catalysts

Kennedy

Hollins

2001

Handbook of Vibrational Spectroscopy

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The sections in this article are Introduction and Historical Perspective Experimental Techniques Transmission Infrared Spectroscopy Diffuse Reflection Infrared Fourier Transform Spectroscopy ( DRIFTS ) Infrared Microscopy Infrared Emission Spectroscopy R aman Spectroscopy Inelastic Neutron Scattering Inelastic Electron Tunneling Spectroscopy Physical Principles The Metal–Surface Selection Rule Dipolar Coupling Effects Applications Carbon Monoxide Adsorption Methanol Synthesis Conclusion

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Inelastic Electron Tunneling Spectroscopy

Cited by 5 publications

References 86 publications

Steric Inhibition of Metal Penetration in the Fabrication of Metal/Molecule Contacts

Steric Inhibition of Metal Penetration in the Fabrication of Metal/Molecule Contacts

Scanning Tunneling Microscopy-Based Inelastic Electron Tunneling Spectroscopy Study of the FePc 2D Lattice on Au(111) at 77 K

Vibrational Spectroscopy of Supported Metal Catalysts

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