Structure-dependent change of desorption species from n-alkanethiol monolayers adsorbed on Au(111): Desorption of thiolate radicals from low-density structures

Journal of Physical Chemistry B

Volumn 102, Issue 13, 1998, Pages 2310-2312

  Kondoh, H ^a   Kodama, C ^a   Nozoye, H ^a  

^a NATL INST OF MAT AND CHEM RES   (Japan)

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[No Author keywords available]

Indexed keywords

EID: 0000914639     PISSN: 15206106     EISSN: None     Source Type: Journal    
DOI: 10.1021/jp980175j     Document Type: Article

References (24)

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19. The vapor of hexanethiol was introduced onto the Au(111) surfaces via a variable leak valve with a nozzle (hole diameter, 0.5 mm; nozzle length, 200 mm; distance from sample, 10 mm). Here, since the local pressure at the sample position during the exposure could not be precisely calibrated, we use readings of a pressure gauge located 200 mm underneath the sample as apparent gas pressures.
20. At 0.5 langmuirs, a small amount of herringbone-like features still remain on the surface, and these features completely disappear at slightly higher exposures (0.6 langmuirs). Surface areas other than the herringbone-like features and striped islands are filled with obscure domains, which we attributed to a "2D liquid" phase since these domains have no ordered structure and their domain boundaries are fluctuating. The details of the growth processes will be reported elsewhere. Kondoh, H.; Kodama, C.; Sumida, H.; Nozoye, H. To be submitted.
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24. Annealing of the high-density phases (i.e., the disordered phase and the c(4 × 2) phase) results in transformation to the striped phase via partial desorption of the surface thiolates. TD spectra for the high-density phases also exhibit desorption features associated with the thiolate radicals at around 510 K, which is probably due to the structure transformation during the TDS ramp.