Silicon surfaces with different reconstruction, Si(111)-7X7 and Si(001)-2X1, are exposed to a molecular beam of copper phthalocyanine. On Si(111) the adsorbate-substrate interaction is strong, as suggested by a partial reduction of copper shown in the XPS spectra and by the evidence provided by STM of a chemical reaction involving some of the Si adatoms. As a consequence, the molecules are not imaged at atomic scale by STM. At variance with this behaviour, on the single-domain Si(001)-2X1 face, the adsorbed molecules are clearly imaged by STM, suggesting an adsorption state more weakly bonded. This is the first observation of Cu phthalocyanine molecules imaged on a silicon surface, and it further illustrates the potential of STM for surface chemistry.
Rochet, F., Dufour, G., Roulet, H., Motta, N., Sgarlata, A., Piancastelli, M., et al. (1994). COPPER PHTHALOCYANINE ON SI(111)-7X7 AND SI(001)-2X1 - AN XPS/AES AND STM STUDY. SURFACE SCIENCE, 319(2009/02/01 00:00:00.000), 10-20.
COPPER PHTHALOCYANINE ON SI(111)-7X7 AND SI(001)-2X1 - AN XPS/AES AND STM STUDY
SGARLATA, ANNA;
1994-01-01
Abstract
Silicon surfaces with different reconstruction, Si(111)-7X7 and Si(001)-2X1, are exposed to a molecular beam of copper phthalocyanine. On Si(111) the adsorbate-substrate interaction is strong, as suggested by a partial reduction of copper shown in the XPS spectra and by the evidence provided by STM of a chemical reaction involving some of the Si adatoms. As a consequence, the molecules are not imaged at atomic scale by STM. At variance with this behaviour, on the single-domain Si(001)-2X1 face, the adsorbed molecules are clearly imaged by STM, suggesting an adsorption state more weakly bonded. This is the first observation of Cu phthalocyanine molecules imaged on a silicon surface, and it further illustrates the potential of STM for surface chemistry.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
