Dissociative adsorption and thermal desorption of dibromoethylene on Si(100)2×1: surface mediated dehalogenation and recombinative evolution of HBr

Chemical manipulation of multifunctional hydrocarbons on silicon surfaces

“…The general trend for halogenated ethylenes does not hold up for di-and tetra-substituted ethylenes. In the studies of Zhou et al, dibromoethylene [82], cis-dichloroethylene [83], trans-dichloroethylene [329], isodichloroethylene [329] and perchloroethylene [83] all exhibited C-Halogen bond dissociation leading to a variety of products and complex thermal chemistry. Interestingly, whether a mono-σ -bonded or di-σ -bonded structures are formed, it seems that the C=C double bond is preserved remarkably well during the first step of a reaction with Si(100)-2×1.…”

Room-temperature chemisorption and thermal evolution of perchloroethylene and trichloroethylene on Si(111)7×7: Formation of chlorinated vinylene and vinylidene and acetylide adspecies, and thermal etching reactions

“…Although the binding and surface chemistry of halobenzenes on Si single-crystal surfaces have been investigated [6][7][8][9], not much is known about the basic interactions of halogenated derivatives of the simplest unsaturated hydrocarbon (halogenated ethylenes) with the Si surface. Recently, our group has started a series of systematic studies of surface chemical processes of the halogenated ethylenes on Si(1 1 1) and Si(1 0 0) surfaces by using vibrational electron energy loss spectroscopy (EELS) [10], X-ray photoelectron spectroscopy (XPS) [11], and thermal desorption spectrometry (TDS). These studies led us to hypothesize the plausible existence of novel adspecies involving unique bonding structures, including vinylene and vinylidene [10].…”

Competitive Bonding of Amino and Hydroxyl Groups in Ethanolamine on Si(100)2×1: Temperature-Dependent X-Ray Photoemission and Thermal Desorption Studies of Nanochemistry of a Double-Chelating Agent

“…The binding energy (BE) scale of the XPS spectra has been calibrated to the Si 2p feature of the bulk at 99.3 eV. 16 After appropriate background subtraction (using the Shirley background), individual XPS spectral components can be fitted with Gaussian-Lorentzian lineshapes by using the CasaXPS software. For temperature-dependent XPS experiments, the sample was flash-annealed to the preselected temperature and allowed to cool back to room temperature before collecting the XPS spectra.…”

“…We have recently conducted a series of studies involving bifunctional organic molecules on Si(100)2 × 1 surfaces. By comparing the reactivities of several common functional groups, including halogen atoms (Br, 16 Cl), 17 hydroxyl (OH), 18 carbonyl (C O), 18 carboxylic (COOH), 19 and more recently amino (NH 2 groups, 20 to a reference group such as the ethenyl group (C C), we obtain insights into factors that control their reactivities on the 2 × 1 dimer surface. In the present work, we give the first inter-comparison between two of these functional groups, particularly, the hydroxyl and amino groups, in a simple bifunctional molecule, ethanolamine (OH-CH 2 -CH 2 -NH 2 .…”