Covalent attachment of acetonitrile on Si(100) through Si–C and Si–N linkages

Articles you may be interested in 1,2-Dibromoethane on Cu(100): Bonding structure and transformation to C2H4 The covalent binding and adsorption states of acetonitrile on Si͑100͒ have been investigated using temperature programmed desorption ͑TPD͒, x-ray photoelectron spectroscopy ͑XPS͒, high-resolution electron energy loss spectroscopy ͑HREELS͒, and density function theory ͑DFT͒ calculation. XPS and HREELS results show that acetonitrile chemisorbs on Si͑100͒ in a side-on di-␴ binding configuration, forming Si–C and Si–N ␴ bonds. TPD measurements reveal the presence of two desorption states, ␤1 and ␤2 with desorption energies of 29.8 and 24.6 kcal mol Ϫ1 , respectively. Based on DFT calculations, the ␤1 state is possibly assigned to di-␴ bonded acetonitrile on top of a dimer and/or in an in-row bridging chemisorption, while the ␤2 state is related to acetonitrile bonded in a cross-row bridging configuration.