Influence of different aligning surfaces on the morphology of dichroic squaraine films

Grytsenko, K.; Lytvyn, P. M.; Navozenko, O. M.; Ksianzou, Viachaslau; Schrader, Sigurd

doi:10.1007/s00289-020-03150-2

Cited by 4 publications

(5 citation statements)

References 40 publications

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“…The predominant orientation and elongation of PTFE structural units were weak, but such oriented units are seen in figure 11(a) on top across the ridge (marked i) and in figure 11(d) on side walls along the wall almost perpendicular to the trench plane. The similar preferential orientation of structural units across the ridge was found previously on this nanostructured plastic surface for a thin film of squaraine dye [45]. Control of the conformity of the PTFE coating was made by variation of plasma power.…”

Section: Resultssupporting

confidence: 77%

Variations of morphology of fluoropolymer thin films versus deposition conditions

Grytsenko

Kolomzarov

Lytvyn

et al. 2021

Surf. Topogr.: Metrol. Prop.

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Fluoropolymers (FP) are materials with a combination of excellent physical and chemical properties which make them useful in various industries. Thin films of these almost insoluble polymers were deposited with decomposition-evaporation of bulk FP in a vacuum. The pretreatment of the evaporated FP, the pressure of the emitted gas, the activation with accelerated electrons, the additional radio frequency (RF) plasma and the external magnetic field had complex effects on the morphology and relief of polytetrafluoroethylene (PTFE) films. Thin PTFE films with a roughness from 2 to 100 nm were produced. A PTFE film grown in a magnetic filed had nanoworms on its surface. The hardness of PTFE films was increased using low power RF plasma during deposition. The hardness of polychlorothrifluoroethylene (PCTFE) thin film was significantly smaller, whilst the relief of PCTFE films was rougher than that of PTFE films. A conformal PTFE coating was deposited on a nanostructured plastic surface using PTFE evaporation with electron activation and low power RF plasma.

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Section: Resultssupporting

confidence: 77%

Variations of morphology of fluoropolymer thin films versus deposition conditions

Grytsenko

Kolomzarov

Lytvyn

et al. 2021

Surf. Topogr.: Metrol. Prop.

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“…Different polymorphs have low energy of transformation between them, so the deposition conditions play an important role in the formation of the morphology. [26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45] The simultaneous formation of two polymorphs in a thin film of pentacene during PVD was discovered. [48] The almost isoenergetic states of several polymorphs of different dyes were emphasized.…”

Section: Discussionmentioning

confidence: 99%

“…[45] Various aggregations of cyanine dyes on different substrates have been discussed. [26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45] One phase can seed another phase. [47] The formation of a solid from pentacene molecules began from a flatly lying molecular layer on most of the substrates.…”

Section: Discussionmentioning

confidence: 99%

“…The described methods for the formation of NWs and stable color films are the basis for future research, including the mechanism of selective opening of the allyl group, the mechanism of polymerization, and structure formation. Polymer films with functional chromophores are a solution to problems in the production of OO devices from small molecules: Film with gradient properties due to the influence of substrate [26,[43][44][45][46] starting from the metastable phase, changes in properties during exploitation due to internal heating [4] and so on.…”

Section: Discussionmentioning

confidence: 99%

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Electron‐Assisted Deposition‐Polymerization in Vacuum of Polymethines with Terminal Allyl Group

Grytsenko,

Doroshenko,

Kolomzarov

et al. 2023

Macro Materials & Eng

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Polymethines containing an allyl group have been synthesized. Their films are produced by physical vapor deposition (PVD) on glass, silicon (Si), gold (Au), polytetrafluoroethylene (PTFE), and nanostructured plastic substrates. Optical spectra recorded during the deposition showed no decomposition of molecules. The influence of dye structure and substrate on the morphology of the deposits is studied using atomic force microscopy (AFM). Depending on the dye structure and the substrate material, various nanostructures are grown. Dichroic nanowires (NWs) are formed by self‐assembly on Au and Si substrates. On the Si surface, NWs grow between the edges of neighboring Au stripes. Several methods are used for the selective opening of the allyl group. Smooth films are produced with optical spectra similar to those deposited by PVD. The morphology of the films is dependent on the activation conditions. The thermal stability of the films exceeds the stability of those deposited via PVD.

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“…In thin one-component cyanine films (solid) distances between molecules are small compared with the distances between them in liquid solutions; therefore, aggregates can be formed in one-component films with higher probability [ 2 ]. Moreover, one molecule with another can form aggregates of a certain type with a special spatial geometry, depending on their chemical structure and the relief of the substrates [ 5 ]. Dye aggregation is also solvent dependent and temperature dependent [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

Aggregate Formation of Boron-Containing Molecules in Thermal Vacuum Deposited Films

et al. 2021

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The spectral properties of new boron-containing dyes were studied. One-component (pure dyes) and composite “Alq3+dye” thin films were fabricated using the thermal vacuum deposition method. The positions of the transmission spectra maxima in a one-component film are different for different film thicknesses. The best correlation of the maxima positions of the dye transmission spectra in solid and liquid solutions was observed for thicknesses of films close to a few (up to 10) monolayers. On the other hand, the absorption spectra maxima positions of one-component dye films (upper 10 nm) and composite films with high concentration, did not match the corresponding positions of absorption spectra maxima recorded in solutions. Comparison of the absorption spectra in one-component dye films and in solutions indicates the presence of both monomers and their aggregates in one-component films (contrary to solutions where such processes of aggregation do not take place, even at very high concentrations). Simultaneously with aggregation manifestation in the absorption spectra, the intensity of fluorescence of one-component dye films dramatically decreases. A quantum chemical simulation of the possible relative arrangement of two dye molecules indicates that the most possible of the simplest types of aggregates are physical dimers. Films of practical importance (due to efficient energy transfer from host to guest molecules when all singlet excitons are captured) possess a high quantum yield of fluorescence when reaching an impurity concentration of a few percent (aggregation does not take place yet).

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Influence of different aligning surfaces on the morphology of dichroic squaraine films

Cited by 4 publications

References 40 publications

Variations of morphology of fluoropolymer thin films versus deposition conditions

Variations of morphology of fluoropolymer thin films versus deposition conditions

Electron‐Assisted Deposition‐Polymerization in Vacuum of Polymethines with Terminal Allyl Group

Aggregate Formation of Boron-Containing Molecules in Thermal Vacuum Deposited Films

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