Scaling analysis of the morphology of nanostructured poly(p-xylylene) films synthesized by vapor deposition polymerization

Streltsov, D. R.; Бузин, А. И.; Григорьев, Е. И.; Dmitryakov, Petr V.; Mailyan, K. A.; Pebalk, A. V.; Чвалун, С. Н.

doi:10.1134/s1995078008070124

Cited by 8 publications

(4 citation statements)

References 18 publications

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“…However, the average surface roughness of <1 nm for the 8 nm thick films and the uniformity of the granules make it implausible that DM particles would nucleate and grow in the solution and only deposit in a packed monolayer after reaching a certain size. Thus, DM appears to exhibit three-dimensional island growth similar to that observed, for example, in phthalocyanine 45 or poly(pxylylene) 46 films in contrast to pentacene, 47 p-hexaphenyl, 48 or polyethylene 49 films.…”

Section: ■ Materials and Methodssupporting

confidence: 64%

Control of Heterogeneous Nucleation and Growth Kinetics of Dopamine-Melanin by Altering Substrate Chemistry

2015

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Dopamine-melanin (DM or "polydopamine") can be deposited on virtually any substrate from solution through autoxidation of dopamine. The versatility of this process has allowed surface-mediated assembly of DM for a wide variety of functional coatings. Here we report the impact of well-defined surface chemistries on the nucleation and growth of such films. DM was deposited on silicon dioxide (SiO2) and SiO2 substrates modified with self-assembled monolayers (SAMs) bearing octadecyl (C18), phenethyl, and aminopropyl functional groups. Atomic force microscopy revealed three-dimensional islands whose areal density and surface coverage are lowest on bare SiO2 substrates and highest on the neutral aromatic and aliphatic substrates. Increasing the pH of the solution from 8.2 to 10 dissociates catechol moieties in DM and inhibits adsorption on negatively charged SiO2 substrates. The growth rate of DM films on SAM-modified SiO2 is maximized at pH 9.5 and almost completely abolished at pH 10 because of increased DM solubility. The initial rates of DM adsorption were measured using quartz crystal microbalance with dissipation measurements. The initial adsorption rate is proportional to the nucleation density, which increases as the hydrophobicity of the substrate increases. Taken together, these data provide insight into the rates of heterogeneous nucleation and growth of DM on substrates with well-defined chemistries.

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Section: ■ Materials and Methodssupporting

confidence: 64%

Control of Heterogeneous Nucleation and Growth Kinetics of Dopamine-Melanin by Altering Substrate Chemistry

2015

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“…The global scaling exponents were found to follow the dynamic scaling hypothesis with z g = α g /β for various G. With an increase in G from 10 to 10 4 , the average local roughness exponent α l remained close to 0.46 with α l = α g , this observation is unlike the ones obtained in self-affine surfaces [15,35]. The anomalous growth exponent β * was also found to decrease from 0.23(4) to 0.18 (8) with an increase in G. Even though our model is in 1+1D as compared to the 2+1D experiments, our estimates of α l and β * are close to the experimental findings of α ≈ 0.5 to 0.7 and β = 0.25 ± 0.03 obtained from the AFM studies of linear PA-N films grown by VDP [21,51]. The similarity between the experimental and simulational estimates appears to be a coincidence since the dimension of the two systems are totally different.…”

Section: Discussionsupporting

confidence: 83%

Dynamic scaling study of vapor deposition polymerization: A Monte Carlo approach

2010

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The morphological scaling properties of linear polymer films grown by vapor deposition polymerization are studied by 1+1D Monte Carlo simulations. The model implements the basic processes of random angle ballistic deposition (F) , free-monomer diffusion (D) and monomer adsorption along with the dynamical processes of polymer chain initiation, extension, and merger. The ratio G=D/F is found to have a strong influence on the polymer film morphology. Spatial and temporal behavior of kinetic roughening has been extensively studied using finite-length scaling and height-height correlations H(r,t). The scaling analysis has been performed within the no-overhang approximation and the scaling behaviors at local and global length scales were found to be very different. The global and local scaling exponents for morphological evolution have been evaluated for varying free-monomer diffusion by growing the films at G=10 , 10(2), 10(3), and 10(4) and fixing the deposition flux F. With an increase in G from 10 to 10(4), the average growth exponent beta approximately 0.50 was found to be invariant, whereas the global roughness exponent alpha(g) decreased from 0.87 (1) to 0.73 (1) along with a corresponding decrease in the global dynamic exponent z(g) from 1.71(1) to 1.38(2). The global scaling exponents were observed to follow the dynamic scaling hypothesis, z(g)=alpha(g)/beta. With a similar increase in G however, the average local roughness exponent alpha(l) remained close to 0.46 and the anomalous growth exponent beta(*) decreased from 0.23(4) to 0.18(8). The interfaces display anomalous scaling and multiscaling in the relevant height-height correlations. The variation in H(r,t) with deposition time t indicates nonstationary growth. A comparison has been made between the simulational findings and the experiments wherever applicable.

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Section: Film Morphologymentioning

confidence: 99%

“…It is evident from AFM studies that the variations in the molecular size and p-bridge length can cause changes in the microstructure of blended lms. Quantitative investigation of the surface morphology based on the analysis of height correlation functions [35][36][37] This journal is © The Royal Society of Chemistry 2014 N(Ph-1T-DCN-Me) 3 :PC 71 BM and N(Ph-3T-DCN-Hex) 3 :PC 71 BM are more homogeneous and can be described by only one correlation length. These nanoscale aggregated domains are benecial to the exciton charge separation, charge transportation and in turn enhance performance of the OSCs.…”

Section: Film Morphologymentioning

confidence: 99%

Effects of oligothiophene π-bridge length on physical and photovoltaic properties of star-shaped molecules for bulk heterojunction solar cells

et al. 2014

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Scaling analysis of the morphology of nanostructured poly(p-xylylene) films synthesized by vapor deposition polymerization

Cited by 8 publications

References 18 publications

Control of Heterogeneous Nucleation and Growth Kinetics of Dopamine-Melanin by Altering Substrate Chemistry

Control of Heterogeneous Nucleation and Growth Kinetics of Dopamine-Melanin by Altering Substrate Chemistry

Dynamic scaling study of vapor deposition polymerization: A Monte Carlo approach

Effects of oligothiophene π-bridge length on physical and photovoltaic properties of star-shaped molecules for bulk heterojunction solar cells

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