Journal
SURFACE SCIENCE
Volume 646, Issue -, Pages 5-12Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.susc.2015.08.039
Keywords
Aminophenol; Oligomer; STM; DFT; Pt(111); On-surface synthesis
Categories
Funding
- Spanish MINECO [MAT2014-54231-C4-1-P, MAT2014-54231-C4-4-P, MAT2013-47898-C2-2-R]
- EU via the ERC-Synergy Program [ERC-2013-SYG-610256 NANOCOSMOS]
- FCT, Ministry of Science and Technology, Portugal [PTDC/CTM-NAN/121108/2010, SFRH/BPD/90562/2012]
- MICINN
- CSIC-JAE-Doc Fellowship Program (European Social Fund)
- European Union [604391]
- Fundação para a Ciência e a Tecnologia [SFRH/BPD/90562/2012, PTDC/CTM-NAN/121108/2010] Funding Source: FCT
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We have deposited 4-aminophenol on Pt(111) surfaces in ultra-high vacuum and studied the strength of its adsorption through a combination of STM, LEED, XPS and ab initio calculations. Although an ordered (2 root 3 x 2 root 3)R30 degrees phase appears, we have observed that molecule-substrate interaction dominates the adsorption geometry and properties of the system. At RT the high catalytic activity of Pt induces aminophenol to lose the H atom from the hydroxyl group, and a proportion of the molecules lose the complete hydroxyl group. After annealing above 420 K, all deposited aminophenol molecules have lost the OH moiety and some hydrogen atoms from the amino groups. At this temperature, short single-molecule oligomer chains can be observed. These chains are the product of a new reaction that proceeds via the coupling of radical species that is favored by surface diffusion. (C) 2015 Elsevier B.V. All rights reserved.
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