Nondissociative chemisorption of short chain alkanethiols on Au(111)

Izabela Irena Rzeznicka, Junseok Lee, Petro Maksymovych, John T. Yates

研究成果: Article

74 引用 (Scopus)

抄録

The adsorption of methanethiol and n-propanethiol on the Au(111) surface has been studied by temperature-programmed desorption (TPD), Auger electron spectroscopy (AES), and low-temperature scanning tunneling microscopy (LT-STM). Methanethiol desorbs molecularly from the chemisorbed monolayer at temperatures below 220 K in three overlapping desorption processes. No evidence for S-H or C - S bond cleavage has been found on the basis of three types of observations: (1) A mixture of chemisorbed CH 3SD and CD 3SH does not yield CD 3SD, (2) no sulfur remains after desorption, and (3) no residual surface species remain when the adsorbed layer is heated to 300 K as measured by STM. On the other hand, when defects are introduced on the surface by ion bombardment, the desorption temperature of CH 3SH is extended to 300 K and a small amount of dimethyl disulfide is observed to desorb at 410 K, indicating that S-H bond scission occurs on defect sites on Au(111) followed by dimerization of CH 3S(a) species. Propanethiol also adsorbs nondissociatively on the Au(111) surface and desorbs from the surface below 250 K.

元の言語English
ページ(範囲)15992-15996
ページ数5
ジャーナルJournal of Physical Chemistry B
109
発行部数33
DOI
出版物ステータスPublished - 2005 8 25
外部発表Yes

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Chemisorption
chemisorption
desorption
Desorption
methylidyne
cleavage
Defects
Dimerization
defects
disulfides
Scanning tunneling microscopy
Auger electron spectroscopy
Temperature programmed desorption
dimerization
Ion bombardment
Sulfur
Temperature
Auger spectroscopy
temperature
electron spectroscopy

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

これを引用

Nondissociative chemisorption of short chain alkanethiols on Au(111). / Rzeznicka, Izabela Irena; Lee, Junseok; Maksymovych, Petro; Yates, John T.

:: Journal of Physical Chemistry B, 巻 109, 番号 33, 25.08.2005, p. 15992-15996.

研究成果: Article

Rzeznicka, Izabela Irena ; Lee, Junseok ; Maksymovych, Petro ; Yates, John T. / Nondissociative chemisorption of short chain alkanethiols on Au(111). :: Journal of Physical Chemistry B. 2005 ; 巻 109, 番号 33. pp. 15992-15996.
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N2 - The adsorption of methanethiol and n-propanethiol on the Au(111) surface has been studied by temperature-programmed desorption (TPD), Auger electron spectroscopy (AES), and low-temperature scanning tunneling microscopy (LT-STM). Methanethiol desorbs molecularly from the chemisorbed monolayer at temperatures below 220 K in three overlapping desorption processes. No evidence for S-H or C - S bond cleavage has been found on the basis of three types of observations: (1) A mixture of chemisorbed CH 3SD and CD 3SH does not yield CD 3SD, (2) no sulfur remains after desorption, and (3) no residual surface species remain when the adsorbed layer is heated to 300 K as measured by STM. On the other hand, when defects are introduced on the surface by ion bombardment, the desorption temperature of CH 3SH is extended to 300 K and a small amount of dimethyl disulfide is observed to desorb at 410 K, indicating that S-H bond scission occurs on defect sites on Au(111) followed by dimerization of CH 3S(a) species. Propanethiol also adsorbs nondissociatively on the Au(111) surface and desorbs from the surface below 250 K.

AB - The adsorption of methanethiol and n-propanethiol on the Au(111) surface has been studied by temperature-programmed desorption (TPD), Auger electron spectroscopy (AES), and low-temperature scanning tunneling microscopy (LT-STM). Methanethiol desorbs molecularly from the chemisorbed monolayer at temperatures below 220 K in three overlapping desorption processes. No evidence for S-H or C - S bond cleavage has been found on the basis of three types of observations: (1) A mixture of chemisorbed CH 3SD and CD 3SH does not yield CD 3SD, (2) no sulfur remains after desorption, and (3) no residual surface species remain when the adsorbed layer is heated to 300 K as measured by STM. On the other hand, when defects are introduced on the surface by ion bombardment, the desorption temperature of CH 3SH is extended to 300 K and a small amount of dimethyl disulfide is observed to desorb at 410 K, indicating that S-H bond scission occurs on defect sites on Au(111) followed by dimerization of CH 3S(a) species. Propanethiol also adsorbs nondissociatively on the Au(111) surface and desorbs from the surface below 250 K.

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