TY - JOUR
T1 - Thermal reaction and desorption behaviors of 2,5-diiodothiophene on clean and passivated Au surfaces
AU - Liu, Guangming
AU - Ryoo, Kunkul
AU - Kim, Seong H.
N1 - Funding Information:
This work is supported by the American Chemical Society Petroleum Research Funds (PRF# 40605–G5) and the 3M Non-tenured Faculty Award.
Copyright:
Copyright 2009 Elsevier B.V., All rights reserved.
PY - 2007/7/15
Y1 - 2007/7/15
N2 - Thermal reactions and desorption behaviors of 2,5-diiodothiophene on Au were studied with temperature programmed desorption (TPD), X-ray photoelectron spectroscopy (XPS), and Auger electron spectroscopy (AES). Diiodo-substituted hetero-cyclic molecules are an important precursor molecule for photochemical production of conjugated polymers. This paper describes the surface reactions and multilayer structure of 2,5-diiodothiophene in the absence of photon irradiation. 2,5-Diiodothiophene adsorbs molecularly on Au at 100 K. At 200-300 K, the C-I bond of the molecule dissociates producing atomic iodine. The C-I bond cleavage appears to induce further dissociation of the thiophene ring structure. The iodine species desorb at 600-750 K from the surface. The dissociated carbon and sulfur remain on the Au surface even at 800 K. The desorption of thin multilayers occurs at ∼220 K. During the desorption of these layers, a clustering process seems to occur. The desorption of thick multilayer occurs at ∼235 K.
AB - Thermal reactions and desorption behaviors of 2,5-diiodothiophene on Au were studied with temperature programmed desorption (TPD), X-ray photoelectron spectroscopy (XPS), and Auger electron spectroscopy (AES). Diiodo-substituted hetero-cyclic molecules are an important precursor molecule for photochemical production of conjugated polymers. This paper describes the surface reactions and multilayer structure of 2,5-diiodothiophene in the absence of photon irradiation. 2,5-Diiodothiophene adsorbs molecularly on Au at 100 K. At 200-300 K, the C-I bond of the molecule dissociates producing atomic iodine. The C-I bond cleavage appears to induce further dissociation of the thiophene ring structure. The iodine species desorb at 600-750 K from the surface. The dissociated carbon and sulfur remain on the Au surface even at 800 K. The desorption of thin multilayers occurs at ∼220 K. During the desorption of these layers, a clustering process seems to occur. The desorption of thick multilayer occurs at ∼235 K.
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U2 - 10.1016/j.susc.2007.05.010
DO - 10.1016/j.susc.2007.05.010
M3 - Article
AN - SCOPUS:34447251479
VL - 601
SP - 2967
EP - 2972
JO - Surface Science
JF - Surface Science
SN - 0039-6028
IS - 14
ER -