Growth and characterization of vapor-deposited polyaniline on Cu(110)

Plank, R. V.; DiNardo, N. J.; Vohs, John M.

doi:10.1103/physrevb.55.r10241

Cited by 19 publications

(2 citation statements)

References 19 publications

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“…Moreover, hydrogen bonding is possible between aniline molecules. The adsorption of pyridine − and aniline − on metal surfaces has been studied before. None of these works, however, focused on the structure of the multilayers.…”

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Layer-by-Layer Structure in Ultrathin Aniline and Pyridine Films on Ag(111)

et al. 2001

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Ultrathin (1−10 layers) aniline and pyridine films deposited on a Ag(111) surface at 90 K have been examined using thermal programmed desorption (TPD). Multiple desorption peaks have been observed for both systems showing film growth from the first chemisorbed layer to the bulk structure through multiple intermediate layers. The growth mechanisms for the two systems are, however, apparently different. Aniline films are formed one layer at a time with five thermodynamically stable layered structures. In contrast, pyridine films grow through metastable phases, similar to benzene film deposition on metal. In particular, a skin layer over the bulk phase is proposed to account for the TPD spectra. The difference in film growth mechanisms is attributed to the effect of intermolecular interactions.

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Layer-by-Layer Structure in Ultrathin Aniline and Pyridine Films on Ag(111)

et al. 2001

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“…Current methods for producing polymeric thin films include the deposition and polymerization of Langmuir−Blodgett (LB) films, ,− self-assembled monolayers (SAMs), − and reactive monomers adsorbed directly on metal single crystal surfaces. − However, for most systems studied, little is known about the reaction mechanisms leading to polymerization, the thermal decomposition reactions of the polymers formed, or the role of the substrate in these processes. For example, bulk polyimide made from pyromellitic dianhydride (PMDA) and oxydianiline (ODA) is stable at temperatures up to 500 °C. , However, polyimide films made from reactive adsorption of PMDA and ODA on Cu(110) decompose at ∼280 °C. , The thermal stability of the film is believed to be limited by the reactivity of the carboxylate endgroups bound to the surface, but the decomposition pathway and the influence of the substrate on the endgroup stability have not been thoroughly studied. Ultimately, elucidating the polymerization initiation, propagation, and termination mechanisms in addition to correlating the role of the surface on both formation and decomposition may enable the design of high-quality crystalline polymeric thin films whose stability rivals that seen in the bulk.…”

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Evidence for Two Chain Length Distributions in the Polymerization of Formaldehyde on Cu(100)

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Garrett

2001

Langmuir

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The polymer species formed from the spontaneous polymerization of formaldehyde (H2CO) on clean Cu(100) at 85 K were studied using electron energy loss spectroscopy (EELS) and temperature-programmed desorption (TPD). Formaldehyde forms poly(oxymethylene) (POM) with differing chain lengths; the long (R) and short (β) chain species depolymerize to give two features in TPD at approximately 207 and 219 K, respectively. The complex desorption kinetics observed for the R-POM species were successfully modeled using equations based on the ratio of the average number of monomers unzipped from the chain per initiation event to the length of the polymer chain. Losses were observed in EEL spectra of the short-chain species at ∼290, ∼1020, and ∼1120 cm -1 that can be assigned to the ν(Cu-O), ν(C-O), and F(CH3) modes of oxygen and methoxy endgroups, respectively. Preadsorbed methanol increases the proportion of shortchain POM species by increasing the probability of termination for the β species. Lower thermal stability for adsorbed POM was observed compared to bulk POM and is believed to be related to the stability of the surface-bound oxygen endgroup.

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