Study of the growth process of in situ polyaniline deposited films

Travain, Silmar Antonio; Souza, Nara C. de; Balogh, Débora Terezia; Giacometti, J.A.

doi:10.1016/j.jcis.2007.08.024

Cited by 24 publications

(20 citation statements)

References 37 publications

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“…[16,17,[19][20][21] have features similar to the model illustration in Fig. 6 (in most cases without the flat grains).…”

Section: Comparison With Experimental Resultssupporting

confidence: 59%

“…Films formed with bilayers of poly(allylamine hydrochloride) and a side-chain-substituted azobenzene copolymer (Ma-co-DR13), after deposition of 10 or 20 bilayers, show grains with a broad size distribution, and the initial roughness exponents 0.81 and 0.79 [19]. AFM images of chemically deposited polyaniline thin films on glass substrates [20] have similar features, but, as far as we know, roughness scaling was not studied with those images. The surface of LangmuirBlodgett films of polyaniline and a neutral biphosphinic ruthenium complex (Rupy) of Ref.…”

Section: Comparison With Experimental Resultsmentioning

confidence: 99%

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Roughness exponents and grain shapes

Reis

2011

Phys. Rev. E

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In surfaces with grainy features, the local roughness w shows a crossover at a characteristic length rc, with roughness exponent changing from α1 ≈ 1 to a smaller α2.. The grain shape, the choice of w or height-height correlation function (HHCF) C, and the procedure to calculate root mean-square averages are shown to have remarkable effects on α1. With grains of pyramidal shape, α1 can be as low as 0.71, which is much lower than the previous prediction 0.85 for rounded grains. The same crossover is observed in the HHCF, but with initial exponent χ1 ≈ 0.5 for flat grains, while for some conical grains it may increase to χ1 ≈ 0.7. The universality class of the growth process determines the exponents α2 = χ2 after the crossover, but has no effect on the initial exponents α1 and χ1, supporting the geometric interpretation of their values. For all grain shapes and different definitions of surface roughness or HHCF, we still observe that the crossover length rc is an accurate estimate of the grain size. The exponents obtained in several recent experimental works on different materials are explained by those models, with some surface images qualitatively similar to our model films.

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“…[16,17,[19][20][21] have features similar to the model illustration in Fig. 6 (in most cases without the flat grains).…”

Section: Comparison With Experimental Resultssupporting

confidence: 59%

Section: Comparison With Experimental Resultsmentioning

confidence: 99%

Roughness exponents and grain shapes

Reis

2011

Phys. Rev. E

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show abstract

“…4. There is saturation for immersion times P40 s, suggesting that a full layer of NiTsPc is deposited with an immersion time of 40 s. This behavior may be due to saturation of sites available for adsorption of NiTsPc molecules, and to electrostatic repulsion between adsorbed molecules and molecules in solution [34,35].…”

Section: Adsorption Kinetics Of Pah/nitspc Filmsmentioning

confidence: 99%

Adsorption kinetics and charge inversion in layer-by-layer films from nickel tetrasulfonated phthalocyanine and poly(allylamine hydrochloride)

Silva

Souza

Oliveira

2010

Journal of Non-Crystalline Solids

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“…The inset shows three differents height profile. As noted, there is a preferential vertical growth, unlike from films prepared with the polydisperse POMA [21] and PANI [42], which show globular aggregates with no preferential growth direction. This kind of structure had already been identified by Nishida et al [43] for phthalocyanine films onto gold surfaces by STM data.…”

Section: Resultsmentioning

confidence: 84%