Ion-induced erosion of organic self-assembled monolayers

P. Cyganik; Z. Postawa; C. A. Meserole; E. Vandeweert; N. Winograd

doi:10.1016/S0168-583X(98)00751-4

Ion-induced erosion of organic self-assembled monolayers

P. Cyganik, Z. Postawa, C. A. Meserole, E. Vandeweert, N. Winograd

Research output: Contribution to journal › Article

13 Scopus citations

Abstract

Laser post-ionization mass spectrometry combined with Scanning Tunneling Microscopy (STM) has been used to investigate processes of ion-stimulated erosion of self-assembled monolayers (SAM) of phenethyl mercaptan C₆H₅CH₂CH₂S (PEM) deposited on gold. Results indicate that only PEM fragments are emitted from the surface. Most of the PEM fragments (predominantly C₆H₅CH₂CH₃ with m/z= 106) are emitted with thermal kinetic energies. STM images collected on 8 keV H₂⁺-irradiated surfaces with a system tuned to probe electronic states of sulfur atoms show no additional damage induced by irradiation. This indicates that sulfur atoms are not removed from the surface during hydrogen bombardment. It is proposed that the emission of SAM molecules is initiated by chemical reactions which gently break C-S bonds.

Original language	English (US)
Pages (from-to)	137-142
Number of pages	6
Journal	Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume	148
Issue number	1-4
DOIs	https://doi.org/10.1016/S0168-583X(98)00751-4
State	Published - Jan 1 1999

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Instrumentation

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10.1016/S0168-583X(98)00751-4

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title = "Ion-induced erosion of organic self-assembled monolayers",

abstract = "Laser post-ionization mass spectrometry combined with Scanning Tunneling Microscopy (STM) has been used to investigate processes of ion-stimulated erosion of self-assembled monolayers (SAM) of phenethyl mercaptan C6H5CH2CH2S (PEM) deposited on gold. Results indicate that only PEM fragments are emitted from the surface. Most of the PEM fragments (predominantly C6H5CH2CH3 with m/z= 106) are emitted with thermal kinetic energies. STM images collected on 8 keV H2+-irradiated surfaces with a system tuned to probe electronic states of sulfur atoms show no additional damage induced by irradiation. This indicates that sulfur atoms are not removed from the surface during hydrogen bombardment. It is proposed that the emission of SAM molecules is initiated by chemical reactions which gently break C-S bonds.",

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T1 - Ion-induced erosion of organic self-assembled monolayers

AU - Cyganik, P.

AU - Postawa, Z.

AU - Meserole, C. A.

AU - Vandeweert, E.

AU - Winograd, N.

PY - 1999/1/1

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N2 - Laser post-ionization mass spectrometry combined with Scanning Tunneling Microscopy (STM) has been used to investigate processes of ion-stimulated erosion of self-assembled monolayers (SAM) of phenethyl mercaptan C6H5CH2CH2S (PEM) deposited on gold. Results indicate that only PEM fragments are emitted from the surface. Most of the PEM fragments (predominantly C6H5CH2CH3 with m/z= 106) are emitted with thermal kinetic energies. STM images collected on 8 keV H2+-irradiated surfaces with a system tuned to probe electronic states of sulfur atoms show no additional damage induced by irradiation. This indicates that sulfur atoms are not removed from the surface during hydrogen bombardment. It is proposed that the emission of SAM molecules is initiated by chemical reactions which gently break C-S bonds.

AB - Laser post-ionization mass spectrometry combined with Scanning Tunneling Microscopy (STM) has been used to investigate processes of ion-stimulated erosion of self-assembled monolayers (SAM) of phenethyl mercaptan C6H5CH2CH2S (PEM) deposited on gold. Results indicate that only PEM fragments are emitted from the surface. Most of the PEM fragments (predominantly C6H5CH2CH3 with m/z= 106) are emitted with thermal kinetic energies. STM images collected on 8 keV H2+-irradiated surfaces with a system tuned to probe electronic states of sulfur atoms show no additional damage induced by irradiation. This indicates that sulfur atoms are not removed from the surface during hydrogen bombardment. It is proposed that the emission of SAM molecules is initiated by chemical reactions which gently break C-S bonds.

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