Adsorption and thermal decomposition of 2-octylthieno[3,4-b]thiophene on Au(111)
- Title
- Adsorption and thermal decomposition of 2-octylthieno[3,4-b]thiophene on Au(111)
- Author
- 노재근
- Keywords
- 2-Octylthieno[3,4-b]thiophene; Adsorption; Dissociation; Scanning tunneling microscopy; X-ray photoelectron spectroscopy; Temperature programmed desorption
- Issue Date
- 2012-10
- Publisher
- Elsevier Science B.V., Amsterdam
- Citation
- Journal of Colloid and Interface Science, 2012, 384(1), 143p ~ 148p
- Abstract
- The adsorption and thermal stability of 2-octylthieno[3,4-b]thiophene (OTTP) on the Au(1 1 1) surfaces have been studied using scanning tunneling microscopy (STM), temperature programmed desorption (TPD), and X-ray photoelectron spectroscopy (XPS). UHV-STM studies revealed that the vapor-deposited OTTP on Au(1 1 1) generated disordered adlayers with monolayer thickness even at saturation coverage. XPS and TPD studies indicated that OTTP molecules on Au(1 1 1) are stable up to 4501< and further heating of the sample resulted in thermal decomposition to produce H-2 and H2S via C-S bond scission in the thieno-thiophene rings. Dehydrogenation continues to occur above 600 K and the molecules were ultimately transformed to carbon clusters at 900 K. Highly resolved air-STM images showed that OTTP adlayers on Au(1 1 1) prepared from solution are composed of a well-ordered and low-coverage phase where the molecules lie flat on the surface, which can be assigned as a (9 x 2 root 33)R5 degrees structure. Finally, based on analysis of STM, TPD, and XPS results, we propose a thermal decomposition mechanism of OTTP on Au(1 1 1) as a function of annealing temperature. (C) 2012 Elsevier Inc. All rights reserved.
- URI
- https://www.sciencedirect.com/science/article/pii/S0021979712006340http://hdl.handle.net/20.500.11754/67465
- ISSN
- 0021-9797
- DOI
- 10.1016/j.jcis.2012.06.020
- Appears in Collections:
- COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > CHEMISTRY(화학과) > Articles
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