Scanning tunneling microscopy study of the coverage-dependent structures of pentacene on Au(111)

摘要: Pentacene thin films on Au(111) have been investigated at various coverages using scanning tunneling microscopy (STM) and temperature-programmed desorption (TPD). Two distinct binding environments, surface bound bulk-like, were evident from TPD. The monolayer multilayer pentacene molecules had energies of 110 106 kJ/mol, respectively. STM investigations surfaces with around 0.25 equivalents (MLE) yielded four different ordered structures end-to-end nearest neighbor interactions. Increasing the coverage to 1 MLE leads single rows aligned side-by-side. images an annealed film revealed that these side-by-side are dominant structure for complete films. A periodic row a large spacing 61 was observed form in greater than (1.1−1.5 MLE). Upon deposition 2 MLE, widely spaced r...