Electrochemical growth of synthetic melanin thin films by constant potential methods

Kim, In Gyun; Nam, Hye Jin; Ahn, Hyeon Ju; Jung, Dongsoo

doi:10.1016/j.electacta.2010.12.095

Cited by 29 publications

(22 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…During the polymerization, the dopamine oxidation was proceeded by the redox process10 involving two electrons and two protons compared with that of the melanin prepared by oxidative polymerization 14. 15…”

Section: Resultsmentioning

confidence: 99%

“…During the polymerization, the dopamine oxidation was proceeded by the redox www.chemeurj.org process [10] involving two electrons and two protons compared with that of the melanin prepared by oxidative polymerization. [14,15] Figure 3 shows the photocurrent density-voltage curves of PDA sensitized solar cells of the PDA-DC and PDA-CV dyes dependent on the coating methods, dip-coating time and concentration and LiI electrolyte concentration. Interestingly, the photovoltaic parameters were markedly changed as a function of the coating methods, reaction times and solution concentrations; the detailed photovoltaic parameters are shown in Table 1.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

A New Mussel‐Inspired Polydopamine Sensitizer for Dye‐Sensitized Solar Cells: Controlled Synthesis and Charge Transfer

Nam

Kim

et al. 2012

Chemistry A European J

Self Cite

View full text Add to dashboard Cite

The efficient electron injection by direct dye-to-TiO(2) charge transfer and strong adhesion of mussel-inspired synthetic polydopamine (PDA) dyes with TiO(2) electrode is demonstrated. Spontaneous self-polymerization of dopamine using dip-coating (DC) and cyclic voltammetry (CV) in basic buffer solution were applied to TiO(2) layers under a nitrogen atmosphere, which offers a facile and reliable synthetic pathway to make the PDA dyes, PDA-DC and PDA-CV, with conformal surface and perform an efficient dye-to-TiO(2) charge transfer. Both synthetic methods led to excellent photovoltaic results and the PDA-DC dye exhibited larger current density and efficiency values than those in the PDA-CV dye. Under simulated AM 1.5 G solar light (100 mW cm(-2)), a PDA-DC dye exhibited a short circuit current density of 5.50 mW cm(-2), corresponding to an overall power conversion efficiency of 1.2 %, which is almost 10 times that of the dopamine dye-sensitized solar cell. The PDA dyes showed strong adhesion with the nanocrystalline TiO(2) electrodes and the interface engineering of a dye-adsorbed TiO(2) surface through the control of the coating methods, reaction times and solution concentration maximized the overall conversion efficiency, resulting in a remarkably high efficiency.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

A New Mussel‐Inspired Polydopamine Sensitizer for Dye‐Sensitized Solar Cells: Controlled Synthesis and Charge Transfer

Nam

Kim

et al. 2012

Chemistry A European J

Self Cite

View full text Add to dashboard Cite

show abstract

“…These protomolecules use strong π-π stacking and hydrogen bonding interactions that promote self-assembly into spherical nanostructures with an intermolecular spacing of 3.8 Å and characteristic dimensions of 100-300 nm (50,51). Synthetic melanins can also be prepared from oxidative polymerization of L-DOPA, dopamine, or indole derivatives (52,53). Although the chemical functionalities of natural eumelanins are conserved in synthetic melanins, the microstructure is markedly different.…”

Section: Resultsmentioning

confidence: 99%

Biologically derived melanin electrodes in aqueous sodium-ion energy storage devices

Kim

Chun

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

283

254

View full text Add to dashboard Cite

Biodegradable electronics represents an attractive and emerging paradigm in medical devices by harnessing simultaneous advantages afforded by electronically active systems and obviating issues with chronic implants. Integrating practical energy sources that are compatible with the envisioned operation of transient devices is an unmet challenge for biodegradable electronics. Although high-performance energy storage systems offer a feasible solution, toxic materials and electrolytes present regulatory hurdles for use in temporary medical devices. Aqueous sodium-ion charge storage devices combined with biocompatible electrodes are ideal components to power next-generation biodegradable electronics. Here, we report the use of biologically derived organic electrodes composed of melanin pigments for use in energy storage devices. Melanins of natural (derived from Sepia officinalis) and synthetic origin are evaluated as anode materials in aqueous sodium-ion storage devices. Na

show abstract

“…In the work of Guin et al , for example, thin films of synthetic melanin with good adherence and controllable thickness were made using a layer‐by‐layer technique. It has also been reported that it is possible to obtain melanin films from electrochemical deposition methods, electrospray, matrix‐assisted pulsed laser evaporation and direct polymerization of l ‐3,4‐dihydroxyphenylalanine ( l ‐DOPA), DHI or dopamine on a substrate.…”

Section: Introductionmentioning

confidence: 99%

Melanin synthesis under oxygen pressure

Bronze‐Uhle

Paulin

Piacenti-Silva

et al. 2016

Polymer International

View full text Add to dashboard Cite

Melanins are promising materials for organic bioelectronics devices like transistors, sensors and batteries. In this study, the chemical structural changes of melanin synthesized, by the auto oxidation of L-DOPA, are analyzed for a new synthetic procedure that uses oxygen under pressure (4 to 8 atm). TEM, DLS, FTIR, NMR and XPS are use to characterize the material. Under oxygen pressure, melanin synthesis is accelerated, the polymer obtained is found to have structural differences most notably a higher number of carbonyl groups and different surface charges compared to conventional synthetic melanin. As a consequence it has higher homogeneity and it is soluble in water. To explain these findings a reaction mechanism is proposed based on current melanogenesis models.Keywords: Melanin, oxygen pressure, solubility, accelerated synthesis. E-mail address: joaovp281@gmail.comThis article is protected by copyright. All rights reserved.This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record. Please cite this article as doi: 10.1002/pi.5185 Accepted Articleexample, thin films of synthetic melanin with good adherence and controllable thickness were made using layer-by-layer technique. It has also been reported that it is possible to obtain melanin films from electrochemical deposition methods, [8] An alternative to obtain good quality films is to modify the melanin structure preserving its main properties, but increasing its solubility or changing its aggregation state. The advantage of this approach is that all processing techniques used up to now for organic semiconducting polymers device production would be available for melanin. In addition, many routine advanced techniques dedicated to thin film or solution characterization could be used. In the last 15 years soluble melanin derivatives were synthesized using different functionalized groups. [14][15][16][17][18] In this study, we propose an alternative synthetic approach for a soluble melanin without any exotic functionalization using molecular oxygen under pressure. Molecular oxygen is considered an ideal oxidant in the context of "green chemistry"; it has low cost, is abundant and environmentally friendly, having thus academic and industrial interest. In addition the synthesis is found to be faster under oxygen pressure. EXPERIMENTALAll the commercially available chemicals were purchased from Acros or Sigma-Aldrich and were used without further purification. In what concerns reproducibility, more than 3 different syntheses were performed and similar optical and structural properties were obtained. Melanin synthesisThe synthesis of melanin was carried out using well-known procedures briefly described. [19] Initially 0.3 g of L-3,4-dihydroxyphenylalanine (L-DOPA) was dissolved in 60 mL of deionized water (Milli-Q), next 0.4 mL of ammonium hydroxide (NH 4 OH) is added, ...

show abstract

Electrochemical growth of synthetic melanin thin films by constant potential methods

Cited by 29 publications

References 27 publications

A New Mussel‐Inspired Polydopamine Sensitizer for Dye‐Sensitized Solar Cells: Controlled Synthesis and Charge Transfer

A New Mussel‐Inspired Polydopamine Sensitizer for Dye‐Sensitized Solar Cells: Controlled Synthesis and Charge Transfer

Biologically derived melanin electrodes in aqueous sodium-ion energy storage devices

Melanin synthesis under oxygen pressure

Contact Info

Product

Resources

About