Polyatomicity and kinetic energy effects on surface polymerization by ion-assisted deposition

Choi, Jin Sik; Zachary, Adam M.; Tepavcevic, Sanja; Wu, Chunping; Hanley, Luke

doi:10.1016/j.ijms.2004.12.022

Cited by 13 publications

(34 citation statements)

References 28 publications

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“…Experimental results show a difference in yield between 100 eV Ar and thiophene, with thiophene producing higher molecular weight species. 19 Experimentally, thiophene ions and 3T neutrals are deposited simultaneously. However, given an ion flux of 5 Â 10 13 ions/s 3 cm 2 and a neutral flux of 5 Â 10 15 ions/ s 3 cm 2 for the 1:100 ion to neutral ratio 16 and the surface of the simulation cell of 25 nm 2 , this corresponds to 1 neutral per 0.8 ms and 1 ion per 80 ms.…”

Section: ' Resultsmentioning

confidence: 99%

“…One method that combines ion-beam and thermal deposition principles to produce stable conducting organic films is surface polymerization by ion-assisted deposition (SPIAD). − This method employs the codeposition of thermal α-terthiophene and hyperthermal thiophene cations to induce polymerization at the gas–solid interface. The production of higher molecular weight species during the polymerization process is beneficial for organic photovoltaics in that the films show an increase in stability when compared to the precursors .…”

Section: Introductionmentioning

confidence: 99%

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Mechanisms of Ion-Beam Modification of Terthiophene Oligomers from Atomistic Simulations

Kemper

Sinnott

2011

J. Phys. Chem. C

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Ion-beam deposition on organic surfaces is a common approach to induce surface modification. Here, the difference in argon and polyatomic thiophene hyperthermal deposition on terthiophene oligomers is explored in classical molecular dynamics simulations. The forces on the atoms are determined using the second-generation reactive empirical bond order potential for hydrocarbons that is modified to include sulfur. Details of the potential fit and parametrization are provided. The simulations predict that the thiophene induces fracture of the terthiophene rings while largely retaining the chemical structure of terthiophene. Conversely, argon is predicted to alter the number of carbons within the terthiophene during modification.

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Section: ' Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mechanisms of Ion-Beam Modification of Terthiophene Oligomers from Atomistic Simulations

Kemper

Sinnott

2011

J. Phys. Chem. C

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“…The instrumentation used in this work for ion bombardment and X-ray photoelectron analysis has been previously described [58][59][60]. The ion irradiation layout can be seen in Figure 1.…”

Section: Methodsmentioning

confidence: 99%

Metal impurity-assisted formation of nanocone arrays on Si by low energy ion-beam irradiation

et al. 2016

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Fabrication of nanocone arrays on Si surfaces was demonstrated using grazing incidence irradiation with 1 keV Ar + ions concurrently sputtering the surface and depositing metal impurity atoms on it. Among three materials compared as co-sputtering targets Si, Cu and stainless steel, only the steel was found to assist the growth of dense arrays of nanocones at ion fluences between 10 18 and 10 19 ions/cm 2. The structural characterization of samples irradiated with these ion fluences using Scanning Electron Microscopy and Atomic Force Microscopy revealed that regions far away from co-sputtering targets are covered with nanoripples, and that nanocones popped-up out of the rippled surfaces when moving closer to co-sputtering targets, with their density gradually increasing and reaching saturation in the regions close to these targets. The characterization of the samples' chemical composition with Total Reflection X-ray Fluorescence Spectrometry and X-ray Photoelectron Spectroscopy revealed that the concentration of metal impurities originating from stainless steel (Fe, Cr and Ni) was relatively high in the regions with high density of nanocones (Fe reaching a few atomic percent) and much lower (factor of 10 or so) in the region of nanoripples. Total Reflection X-ray Fluorescence Spectrometry measurements showed that higher concentrations of these impurities are accumulated under the surface in both regions. X-ray Photoelectron Spectroscopy experiments showed no direct evidence of metal silicide formation occurring on one region only (nanocones or nanoripples) and thus showed that this process could not be the driver of nanocone array formation. Also, these measurements indicated enhancement in oxide formation on regions covered by nanocones. Overall, the results of this study suggest that the difference in concentration of metal impurities in the thin near-surface layer forming under ion irradiation might be responsible for the differences in surface structures.

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“…It was used to measure the flux of evaporated molecules and the resultant film thickness (32). A second QCM, QCM ONAXIS , was perpendicular to the CBD source and was modified to allow characterization of the CBD source using a retarding field grid, with two Teflon wafers sandwiching and isolating a Ni grid.…”

Section: Methodsmentioning

confidence: 99%

Cluster Beam Deposition of Lead Sulfide Nanocrystals into Organic Matrices

Zachary

Bolotin

Asunskis

et al. 2009

ACS Appl. Mater. Interfaces

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Lead sulfide nanocrystals (PbS NCs) were codeposited into two organic films, titanyl phthalocyanine (TiOPc) and alpha-sexithiophene, using cluster beam deposition (CBD). NCs of average diameters of approximately 3-4 nm were evenly distributed in these organic films with average particle spacings of approximately 4 nm, as determined by transmission electron microscopy. The film composition and NC surface chemistry were monitored by X-ray photoelectron spectroscopy (XPS) and other methods. Pb:S stoichiometry in the NC/TiOPc film was determined by XPS to correspond to the PbS cubic rock salt structure. Soft-XPS using 200 eV energy photons determined the NC-organic surface chemistry by resolving the S 2p core level into four distinct components for sulfur. The soft-XPS results found that the PbS NC surface chemistry could be tuned by varying the H(2)S/Ar gas ratio within the CBD source.

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Polyatomicity and kinetic energy effects on surface polymerization by ion-assisted deposition

Cited by 13 publications

References 28 publications

Mechanisms of Ion-Beam Modification of Terthiophene Oligomers from Atomistic Simulations

Mechanisms of Ion-Beam Modification of Terthiophene Oligomers from Atomistic Simulations

Metal impurity-assisted formation of nanocone arrays on Si by low energy ion-beam irradiation

Cluster Beam Deposition of Lead Sulfide Nanocrystals into Organic Matrices

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