TY - JOUR
T1 - Gold-thiolate cluster emission from SAMs under keV ion bombardment
T2 - Atomic Collisions in Solids
AU - Arezki, B.
AU - Delcorte, A.
AU - Chami, A. C.
AU - Garrison, B. J.
AU - Bertrand, P.
N1 - Funding Information:
This work is supported by the PAI-IUAP P4/10 Research program on “Reduced Dimensionality Systems” of the Belgium Federal State. A.D. also acknowledges the Belgian Fonds National pour la Recherche Scientifique for financial support. The ToF-SIMS experiment was acquired with the support of the R é gion Wallonne and FRFC-Loterie Nationale of Belgium.
PY - 2003/12
Y1 - 2003/12
N2 - In this contribution the emission of gold-molecule cluster ions from self-assembled monolayers (SAMs) of alkanethiols on gold is investigated using time-of-flight secondary ion mass spectrometry (ToF-SIMS). Layers of alkanethiols [CH3(CH2)nSH] with various chain lengths (n=8, 12, 16) have been chosen because they form well-ordered molecular monolayers on gold. First, we compare and interpret the yields and energy spectra of gold-thiolate cluster ions, obtained for different thiol sizes. Our results show that the unimolecular dissociation of larger aggregates in the acceleration section of the spectrometer constitutes a significant formation channel for gold-molecule clusters. Second, we present preliminary results of molecular dynamics simulations performed in order to improve our understanding of the cluster emission processes. These calculations have been conducted using 8 keV projectiles and a long-range term in the hydrocarbon potential in order to account for the van der Waals forces between the thiol chains.
AB - In this contribution the emission of gold-molecule cluster ions from self-assembled monolayers (SAMs) of alkanethiols on gold is investigated using time-of-flight secondary ion mass spectrometry (ToF-SIMS). Layers of alkanethiols [CH3(CH2)nSH] with various chain lengths (n=8, 12, 16) have been chosen because they form well-ordered molecular monolayers on gold. First, we compare and interpret the yields and energy spectra of gold-thiolate cluster ions, obtained for different thiol sizes. Our results show that the unimolecular dissociation of larger aggregates in the acceleration section of the spectrometer constitutes a significant formation channel for gold-molecule clusters. Second, we present preliminary results of molecular dynamics simulations performed in order to improve our understanding of the cluster emission processes. These calculations have been conducted using 8 keV projectiles and a long-range term in the hydrocarbon potential in order to account for the van der Waals forces between the thiol chains.
UR - http://www.scopus.com/inward/record.url?scp=0242332343&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0242332343&partnerID=8YFLogxK
U2 - 10.1016/S0168-583X(03)01457-5
DO - 10.1016/S0168-583X(03)01457-5
M3 - Conference article
AN - SCOPUS:0242332343
SN - 0168-583X
VL - 212
SP - 369
EP - 375
JO - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
JF - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
IS - 1-4
Y2 - 19 January 2003 through 24 January 2003
ER -