The Study of Ordered Melanin Films

Davidenko, S. A.; Kurik, M. V.; Piryatinskiĭ, Yu. P.; Verbitsky, A. B.

doi:10.1080/15421400802451485

Cited by 6 publications

(9 citation statements)

References 6 publications

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“…Davidenko et al showed the formation of both, amorphous and ordered (dendritic) melanin films [13]. Highly organized structures are formed only in the presence of PC, and may potentially be responsible for the high increase of the photocurrent due to optimized orientation of the chromophores; [15,18]. PC is known to form trimers, which are able to assemble into hexamers and further into rods.…”

Section: Resultsmentioning

confidence: 99%

Hematite photoanode co-functionalized with self-assembling melanin and C-phycocyanin for solar water splitting at neutral pH

et al. 2017

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Nature provides functional units which can be integrated in inorganic solar cell materials, such as light harvesting antenna proteins and photosynthetic molecular machineries, and thus help in advancing artificial photosynthesis. Their integration needs to address mechanical adhesion, light capture, charge transfer and corrosion resistance. We showed recently how enzymatic polymerization of melanin can immobilize the cyanobacterial light harvesting protein C-phycocyanin on the surface of hematite, a prospective metal oxide photoanode for solar hydrogen production by water splitting in photoelectrochemical cells. After the optimization of the functionalization procedure, in this work we show increased reproducible hydrogen production, measured parallel to the photocurrent on this bio-hybrid electrode in benign neutral pH phosphate. Over 90% increase compared to the photocurrent of the pristine hematite could be achieved. The hydrogen evolution was monitored during the photoelectrochemical measurement in an improved photoelectrochemical cell. The C-phycocyanin-melanin coating on the hematite was shown to exhibit a comb-like fractal pattern. Raman spectroscopy supported the presence of the protein on the hematite anode surface. The stability of the protein coating is demonstrated during the 2 h GC measurement and in an operando 24 h current density measurement.

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Section: Resultsmentioning

confidence: 99%

Hematite photoanode co-functionalized with self-assembling melanin and C-phycocyanin for solar water splitting at neutral pH

et al. 2017

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“…Our previous studies [5,6] showed that nanoclusters of the stack type can be formed in the melanin films of biological origin.…”

Section: Introductionmentioning

confidence: 99%

“…Our analysis of publications [1][2][3][4][5][6] has shown that the features of possible ordering in aqueous solutions of melanin clarified on the basis of electrical conductivity measurements were not previously studied in detail. Therefore, the purpose of this work was to deepen the study of conductivity inherent to aqueous solutions of melanin of biological origin with varying its purity and ionic composition of water.…”

Section: Introductionmentioning

confidence: 99%

Nonmonotonic (in concentration) conductivity of aqueous solutions of fungal melanin

Koval’chuk¹

2018

Semicond. Phys. Quantum Electron. Optoelectron.

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The conductivity of aqueous (distilled and natural water) solutions of fungal melanin (purified and non-purified) has been studied. It has been shown that, in the presence of impurities, the conductivity of solution increases (for the concentration 0.1 wt% about an order of magnitude). On the concentration dependences of the melanin conductivity within the range of 0.0001 to 1 wt.% at least three particular sections have been detected. It was suggested that the presence of such sections is caused by three types of aggregation of melanin molecules: aggregation of several (mostly oppositely charged) molecules under the lowest melanin concentration, formation of nanoscale melanin clusters for the concentration of 0.002 to 0.06 wt.% and formation of micelles, when the melanin concentration is higher than 0.1 wt.%.

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“…obtained from natural sources or via synthetic routes. Both natural and synthetic melanins have already found their practical applications [1][2][3][4][5][6]. The most studied synthetic melanin, eumelanin, has well-defined molecular structure of monomers, such as 5,6-indolequinone, 5,6-dihydroxyindole (DHI) and 5,6-dihydroxyindole carboxylic acid (DHICA).…”

Section: Introductionmentioning

confidence: 99%

Effect of the charge state on the photoluminescence spectra of melanin

Kostetskyi

Piryatinski

Verbitsky

et al. 2018

Molecular Crystals and Liquid Crystals

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Steady-state and time-resolved photoluminescence (PL) spectra of natural and synthetic melanin, as well as melanin composites with surfactant, sodium dodecylbenzenesulfonate, and polymethine dye, astraphloxin, have been studied. The melanin molecules having differently charged peripheral groups with terminal O atoms and OH groups mixed with the negatively charged surfactant or positively charged astraphloxin dye feature new PL spectral bands. The kinetics of PL and time-resolved emission spectra for the melanin and the composites were also investigated and discussed in terms of intermolecular complexation, nanoaggregation and formation of charge-transfer states. The studies are aiming to understand the electronic properties of various melanins, particularly natural ones.

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The Study of Ordered Melanin Films

Cited by 6 publications

References 6 publications

Hematite photoanode co-functionalized with self-assembling melanin and C-phycocyanin for solar water splitting at neutral pH

Hematite photoanode co-functionalized with self-assembling melanin and C-phycocyanin for solar water splitting at neutral pH

Nonmonotonic (in concentration) conductivity of aqueous solutions of fungal melanin

Effect of the charge state on the photoluminescence spectra of melanin

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