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Adsorption and Thermal Decomposition of 2-octylthieno[3,4-b]thiophene on Au(111)

Adsorption and Thermal Decomposition of 2-octylthieno[3,4-b]thiophene on Au(111)

Joon B Park, Kyukwan Zong, Il Chul Jeon, Jae Ryang Hahn, Dario Stacchiola, David Starr, Kathrin Müller, Jaegeun Noh

J Colloid Interface Sci. 2012 Oct 15;384(1):143-8.

PMID: 22818203

Abstract:

The adsorption and thermal stability of 2-octylthieno[3,4-b]thiophene (OTTP) on the Au(111) 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(111) generated disordered adlayers with monolayer thickness even at saturation coverage. XPS and TPD studies indicated that OTTP molecules on Au(111) are stable up to 450 K and further heating of the sample resulted in thermal decomposition to produce H(2) and H(2)S 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(111) 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 (9×2√33)R5° structure. Finally, based on analysis of STM, TPD, and XPS results, we propose a thermal decomposition mechanism of OTTP on Au(111) as a function of annealing temperature.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP251412	Thieno[3,2-b]thiophene		251-41-2	Price

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