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X-ray photoelectron spectroscopy study of adsorption of (3-mercaptopropyl)trimethoxysilane and n-propyltriethoxysilane on a rutile TiO2(110) surface

Chaudhary, Shilpi LU ; Head, Ashley R. LU and Schnadt, Joachim LU (2015) In Advanced Materials Letters 6(4). p.279-283
Abstract

We have studied the adsorption of two silane compounds, (3-mercaptopropyl) trimethoxysilane (MPTMS) and n-propyltriethoxysilane (PTES), on a rutile TiO2(110) surface using angle dependent X-ray photoelectron spectroscopy. The observation of the S 2p line, in the case of MPTMS, and the C 1s line for both MPTMS and PTES confirms the adsorption of the molecules. For a dose of 122 Langmuirs of MPTMS we find room temperature coverage of 0.55 monolayers, while for a 60 Langmuir dose of PTES the coverage is found to be 0.89 monolayers. Thus, MPTMS has a considerably lower sticking coefficient on the rutile TiO2(110) surface than PTES. Both PTES and MPTES are found to bind dissociatively to the surface. An analysis of... (More)

We have studied the adsorption of two silane compounds, (3-mercaptopropyl) trimethoxysilane (MPTMS) and n-propyltriethoxysilane (PTES), on a rutile TiO2(110) surface using angle dependent X-ray photoelectron spectroscopy. The observation of the S 2p line, in the case of MPTMS, and the C 1s line for both MPTMS and PTES confirms the adsorption of the molecules. For a dose of 122 Langmuirs of MPTMS we find room temperature coverage of 0.55 monolayers, while for a 60 Langmuir dose of PTES the coverage is found to be 0.89 monolayers. Thus, MPTMS has a considerably lower sticking coefficient on the rutile TiO2(110) surface than PTES. Both PTES and MPTES are found to bind dissociatively to the surface. An analysis of angle dependent data further suggests that for MPTMS the thiol group and thus alkyl chain points away from the surface, while for a 0.5 monolayer coverage of PTES the alkyl chain is oriented towards the surface. A higher coverage, ~1 monolayer, the behavior seems to be reversed for at least a fraction of all molecules. Temperature programed XPS measurements suggest that the oxy groups of both molecules desorb from the surface at 550 K, which is in accordance with literature. The present study thus provides information on how these silane coupling agents bind to titanium oxide and what their molecular orientation is on the surface.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
(3-mercaptopropyl) trimethoxysilane, N-propyltriethoxysilane, Silane coupling agents, Titanium dioxide, XPS
in
Advanced Materials Letters
volume
6
issue
4
pages
5 pages
publisher
VBRI Press
external identifiers
  • scopus:84925792650
ISSN
0976-3961
DOI
10.5185/amlett.2015.SMS1
language
English
LU publication?
yes
id
10f66da6-2ac1-4d47-b885-8a254e632a88
date added to LUP
2018-08-07 23:04:33
date last changed
2018-08-08 09:14:41
@article{10f66da6-2ac1-4d47-b885-8a254e632a88,
  abstract     = {<p>We have studied the adsorption of two silane compounds, (3-mercaptopropyl) trimethoxysilane (MPTMS) and n-propyltriethoxysilane (PTES), on a rutile TiO<sub>2</sub>(110) surface using angle dependent X-ray photoelectron spectroscopy. The observation of the S 2p line, in the case of MPTMS, and the C 1s line for both MPTMS and PTES confirms the adsorption of the molecules. For a dose of 122 Langmuirs of MPTMS we find room temperature coverage of 0.55 monolayers, while for a 60 Langmuir dose of PTES the coverage is found to be 0.89 monolayers. Thus, MPTMS has a considerably lower sticking coefficient on the rutile TiO<sub>2</sub>(110) surface than PTES. Both PTES and MPTES are found to bind dissociatively to the surface. An analysis of angle dependent data further suggests that for MPTMS the thiol group and thus alkyl chain points away from the surface, while for a 0.5 monolayer coverage of PTES the alkyl chain is oriented towards the surface. A higher coverage, ~1 monolayer, the behavior seems to be reversed for at least a fraction of all molecules. Temperature programed XPS measurements suggest that the oxy groups of both molecules desorb from the surface at 550 K, which is in accordance with literature. The present study thus provides information on how these silane coupling agents bind to titanium oxide and what their molecular orientation is on the surface.</p>},
  author       = {Chaudhary, Shilpi and Head, Ashley R. and Schnadt, Joachim},
  issn         = {0976-3961},
  keyword      = {(3-mercaptopropyl) trimethoxysilane,N-propyltriethoxysilane,Silane coupling agents,Titanium dioxide,XPS},
  language     = {eng},
  month        = {01},
  number       = {4},
  pages        = {279--283},
  publisher    = {VBRI Press},
  series       = {Advanced Materials Letters},
  title        = {X-ray photoelectron spectroscopy study of adsorption of (3-mercaptopropyl)trimethoxysilane and n-propyltriethoxysilane on a rutile TiO<sub>2</sub>(110) surface},
  url          = {http://dx.doi.org/10.5185/amlett.2015.SMS1},
  volume       = {6},
  year         = {2015},
}