Erika Kozma

Erika Kozma
Italian National Research Council | CNR · Institute for Macromolecular Studies ISMAC

PhD

About

62
Publications
7,469
Reads
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1,122
Citations
Citations since 2017
19 Research Items
751 Citations
2017201820192020202120222023050100150
2017201820192020202120222023050100150
2017201820192020202120222023050100150
2017201820192020202120222023050100150

Publications

Publications (62)
Article
Full-text available
Shaping two-dimensional (2D) materials in arbitrarily complex geometries is a key to designing their unique physical properties in a controlled fashion. This is an elegant solution, taking benefit from the extreme flexibility of the 2D layers but requiring the ability to force their spatial arrangement from flat to curved geometries in a delicate b...
Article
Full-text available
The selective detection of metal ions in water, using sustainable detection systems, is of crescent importance for monitoring water environments and drinking water safety. One of the key elements of future chemical sciences is the use of sustainable approaches in the design of new materials. In this study, we design and synthesize a low-cost, water...
Article
Background: Cells exposed to stress factors experience time-dependent variations of metabolite concentration, acting as reliable sensors of the effective concentration of drugs in solution. NMR can detect and quantify changes in metabolite concentration, thus providing an indirect estimate of drug concentration. The quantification of bactericidal...
Article
Full-text available
Polydopamine is a bioinspired multifunctional material that is emerging in the last years for applications in the biomedical, energy, environmental and catalytic fields. Whereas the conformal coating of solid objects by polydopamine is a well assessed process, the development of polydopamine thin films is less explored and their potential advantage...
Article
Polymer solar cells based on fullerene acceptors have reached in recent years power conversion efficiencies (PCEs) approaching 13%. The advent of non-fullerene acceptors (NFAs) with the advantages of synthetic versatility, a strong absorption ability and high thermal stability has resulted in impressive PCEs of over 18% in single junction devices....
Article
Full-text available
Polymer solar cells (PSCs) based on non-fullerene acceptors have the advantages of synthetic versatility, strong absorption ability, and high thermal stability. These characteristics result in impressive power conversion efficiency values, but to further push both the performance and the stability of PSCs, the insertion of appropriate interlayers i...
Article
Large area molybdenum disulfide (MoS2) monolayers are typically obtained by using perylene‐3,4,9,10‐tetracarboxylic acid tetrapotassium salt (PTAS) as organic seeding promoter in chemical vapor deposition (CVD). However, the influence of the seeding promoter and the involvement of the functional groups attached to the seed molecules on the physical...
Article
Full-text available
Silk fibroin is a biocompatible, non-toxic, mechanically robust protein, and it is commonly used and studied as a material for biomedical applications. Silk fibroin also gained particular interest as a drug carrier vehicle, and numerous silk formats have been investigated for this purpose. Herein, we have prepared electrospun nanofibers from pure s...
Article
Full-text available
In the 2D material framework, molybdenum disulfide (MoS2) was originally studied as an archetypical transition metal dichalcogenide (TMD) material. The controlled synthesis of large-area and high-crystalline MoS2 remains a challenge for distinct practical applications from electronics to electrocatalysis. Among the proposed methods, chemical vapor...
Article
A new amphiphilic perylene dye bearing two carboxylic and two amidic chains (PDA-CA) has been synthesized and the ability to form π–π driven aggregates or folded structures has been investigated in aqueous or organic solvents at different concentrations, by means of NMR spectroscopy, theoretical calculations and optical characterization. The ¹H NMR...
Poster
Among the proposed routes to synthesize MoS 2 nanosheets, chemical vapor deposition (CVD) based approach is gaining consideration because of the good balance between relatively low installation and running costs, and the rich flexibility in terms of process parameters tuning and substrate sizing and conditioning. We grew MoS 2 nanosheets by two CVD...
Article
The crystallization of a model semi-crystalline polymer, namely poly-3-hexylthiophene, was studied as a function of the curvature at the nanometric scale and substrate surface free energy. Nanostructured substrates with controlled local curvature were prepared by deposition of a 235-nm SiO2 particle monolayer, and their surface free energy was modu...
Article
N-Substitution in perylene diimide (PDI) n-type semiconductors is critical for their performance in organic bulk heterojunction solar cells. In this work we synthesized and compared three perylene diimide-spirobifluorene derivatives, N-substituted with different alkyl side groups. These molecular systems were obtained by cost-effective methods, usi...
Article
Core substituted perylene diimides (PDI), obtained by introducing various functional groups into the perylenic bay positions, are well known as versatile materials for optoelectronic applications. The substitution of the perylene core affords mono-, di- and tri-substitutedderivatives, governed by the regioisomeric mixture of the 1,6- and 1,7-disubs...
Article
We present the design and the synthesis of substituted 2,2’-bithiophene derivatives to use as π-conjugated bridges in donor-π-acceptor molecules for dye sensitized solar cells. Using a combined theoretical and experimental approach, the photophysical and electrochemical properties of these linkers are also presented. Finally, we show that the photo...
Article
Polymeric nanoparticles obtained by co-aggregation of a polybenzofulvene derivative with bulky substituted perylene diimide dyes in tetrahydrofuran/water mixtures display emission color tunable from blue to red, or deep-red, thanks to energy transfer processes from the polymer to the emissive dyes activated by nanoparticle shrinking. At high water...
Article
The ability of a π-stacked polybenzofulvene derivative to self-assemble with emissive dyes in supramolecular organizations that reduce unwanted microaggregation processes is demonstrated by a study of the photophysical properties of its blends with benzothiadiazole and two perylenediimide derivatives. Films displaying efficient emissions with quant...
Article
The theoretical study of the titled model acceptor-bridge-donor molecular series based on 9H-fluoren-9-ylidenemethyl and 1,3,4-oxadiazole heterocycles is presented. The subunits are linked through a thienyl moiety, and the second α-site of oxadiazole was modified. The quantum chemical model indicated that the electron-donating properties of 9H-fluo...
Article
Poly(3-hexylthiophene-2,5-diyl) (P3HT) can generate nanoporous structures with variable pore diameters ranging from 150 to 600 nm from spin-coated blends with polystyrene (PS). In the present study, we observe the effect of the addition of polymethylmethacrylate (PMMA) to P3HT:PS blends to increase the pore-to-pore dimensions up to the micrometer s...
Article
The modulation of assembly/disassembly of perylene diimide derivatives (PDIs) represents an intriguing challenge for fluorescence sensing purposes. Herein, an aminoacid-functionalized PDI (PDI-Thr) is selected as a conformationally-sensitive probe which transduces the modification of its aggregation state into an optical response. Photoluminescence...
Article
The development of simple, low-cost and selective methods for quantitative detection of mercury ions in aqueous media is still a challenge. Herein, we employ a cysteine based perylene diimide (PDI-Cys) as sensing probe for Hg2+ ions in water. The probe selectively detects the mercury ions in 100% aqueous solution by a fluorescence turn-on response....
Article
We report on the photophysical characterization of two solution-processable red-emissive perylene diimide molecules and on their use in fully solution assembled OLEDs. The two emitters contain sterically hindered aromatic naphthalene or acenaphthene substituents on the perylene core. These fused rings limits the perylene diimide intermolecular π-π...
Article
Organizing materials into well-defined nanostructures by self-assembly is of great interest for manufacturing various photonic devices at limited costs. In this study, we report on a versatile strategy to mold a perylene-containing building block into different fluorescent nanometric objects from zero- to two-dimensional shape: particles, fibers an...
Article
We report on the straightforward preparation and photophysical characterization of four symmetrically substituted water soluble perylene diimides, obtained by functionalizing the imide positions with l-threonine, l-aspartic acid, l-cysteine and l-methionine. The presence of carboxylic groups on the two sides of the aromatic structure conveys a pH-d...
Article
A convenient "one-pot" Friedel-Crafts reaction of mono-, bi- and tert-thiophenes with trifluoroacetic acid anhydride (TFAA) as an acylating agent and magnesium perchlorate dihydrate (anhydron) as catalyst affords trifluoroacetyl-substituted products in high yields. This method provides a novel approach for the synthesis of thiophene based derivativ...
Article
A simple and efficient method for the synthesis of 3-oxopropanenitriles from variously substituted heterocyclic compounds via direct electrophilic cyanoacetylation is described. A series of heterocyclic 3-oxopropanenitriles (2a, 2b, 2c, 2d, 2e, 2f, 2g, 2h, 2i, 2j, 2k) have been synthesized using mixed anhydride (acetic or trifluoroacetic anhydride:...
Article
Polymer wrapped single-walled carbon nanotubes (SWNTs) have been demonstrated to be a very efficient technique to obtain high purity semiconducting SWNT solutions. However, the extraction yield of this technique is low compared to other techniques. Poly-alkyl-thiophenes have been reported to show higher extraction yield compare to polyfluorene deri...
Article
Core-substituted perylene diimides (PDI) are promising candidates as n-type semiconductor materials for organic photovoltaics. The chemical functionalization of perylene diimides in the bay positions is a versatile tool to obtain a series of electron acceptor materials with tunable electron affinity. These materials usually feature a donor-acceptor...
Article
Full-text available
We demonstrate a solution-based fabrication strategy to arrange different polymeric materials on a substrate in the form of micrometric beads by taking advantage of the spontaneous phenomenon of reverse breath figures. The technique we propose here is suitable for different kinds of polymers, including conjugated and fluorescent ones, aiming at a u...
Article
Full-text available
Core substituted perylene diimides (PDIs) are promising candidates as non-fullerene acceptor materials for organic solar cells. The functionalization of PDIs in the bay positions using chemical groups with different electron donating abilities and with steric hindrance is a versatile tool to modify both the optoelectronic properties and the morphol...
Article
Two solution processable donor-acceptor, pi-conjugated molecules that consist of diketopyrrolopyrrole (DPP) central acceptor unit with dibenzofuran (DPP-DBF) or acenaphtene (DPP-ACN) donor substituents, were prepared by Suzuki coupling reaction. The optical, electrochemical and film forming properties of these D-A-D molecules were investigated and...
Article
Full-text available
The bay-substitution of perylene diimide molecules with fused aromatic rings affects both the core structure and the aggregation properties. The photovoltaic performance of P3HT:perylene diimide solar cells show efficiencies twofold higher than the best result obtained in the literature for similar devices.
Article
Full-text available
The photovoltaic characteristics of all polymer bulk heterojunction solar cells made of P3HT and a perylene diimide-based copolymer (PEK3) have been studied. Thermal annealing is needed to improve the performances. Annealing optimization induces an enhancement of the power conversion efficiency from 0.06 to 1%, Jsc from 0.24 to 2.9 mA/cm2 and FF fr...
Article
Two new organic sensitizers for dye solar cells containing a sterically hindered moiety have been synthesized. The introduction of a 3,4-dibutyl-thiophene ring into D-pi-A dyes reduces the sensitizer aggregation and allows the preparation of solar cells with PCE of 7.17% and 6.27% without the use of coadsorbant agents.
Article
Two donor-acceptor copolymers containing perylene diimide and oligothiophenes linked through triple bonds have been designed and synthesized by palladium catalyzed Sonogashira coupling reaction. The introduction of the triple bond spacer between the electron-acceptor perylene moieties and the electron donating oligothiophene moieties produces an ex...
Article
Donor–acceptor alternated copolymers based on perylene diimide units linked in bay positions with oligothiophene units were prepared and used as acceptor material in polymeric solar cells. The copolymers have exhibited ambipolar electrochemical properties, high electronic affinities and wide electronic absorption in the visible spectrum. The spectr...
Article
Two donor–acceptor copolymers containing perylene diimide and oligothiophenes linked through triple bonds have been designed and synthesized by palladium catalyzed Sonogashira coupling reaction. The introduction of the triple bond spacer between the electron acceptor perylene moieties and the electron donating oligothiophene moieties produces an ex...
Article
In this work we have tested in bulk heterojunction solar cells a polymer with a high oxidation potential, Poly-(dithieno[3,2-b:2′,3′-d]thiophene)-3-decylthiophene (P1), as electron donor together with [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) as electron acceptor. We have studied the photovoltaic characteristics of solar cells made with dif...
Conference Paper
The synthesis and characterization of a series of n-type conjugated molecules and polymers is reported along with their application as electron acceptor materials for bulk heterojunction organic solar cells. The synthesis of a series of conjugated donor-acceptor systems based on N,N′-bis(10- nonadecyl)perylene-3,4,9,10-tetracarboxylic diimide moiet...
Article
Cells of Escherichia coli expressing cyclohexanone monooxygenase catalyzed a highly enantioselective Baeyer–Villiger oxidation of α-substituted cyanocyclohexanones, leading to the corresponding enantiopure caprolactones (ees >97 %). Classical kinetic resolution and regiodivergent parallel kinetic resolution patterns were observed, depending on the...
Article
A flavin-modified gold electrode was developed in order to catalyze the electrochemical oxidoreduction of flavoproteins. Surface modification was carried out by a two-step procedure. In the first step a mixed self-assembled monolayer obtained by adsorption of activated and nonactivated 3,3'-dithiopropionic acid (free acid and N-succinimidyl ester)...
Article
The tryptophan (W)-repressor binding protein A (WrbA) identified as an Escherichia coli stationary-phase protein was proposed as the founding member of a new family of multimeric flavodoxin-like proteins implicated in oxidative-stress defense. Since WrbA is largely uncharacterized with respect to both molecular and physiological functions, the pres...
Article
Full-text available
Pure (1S,2R,4S)-1,2-epoxy-p-menthan-4-ol and (1R,2S,4R)-1,2-epoxy-p-menthan-4-ol (trans-epoxides of (4S)-terpinen-4-ol and (4R)-terpinen-4-ol) were prepared and certain reactions of these compounds with nucleophilic reagents were studied. It was shown that the Furst-Plattner rule regarding the trans-diaxial opening of cyclohexene epoxides predicts...
Article
(1S,2R,4S)-1,2-epoxy-p-menthan-4-ol and (1R,2S,4R)-1,2-epoxy-p-menthan-4-ol (trans-epoxides of (4S)-terpinen-4-ol and (4R)-terpinen-4-ol) were prepared and certain reactions of these compounds with nucleophilic reagents were studied. It was shown that the Fuerst-Plattner rule regarding the trans-diaxial opening of cyclohexene epoxides predicts the...
Article
A high level of trans-stereoselectivity in the dihydroxylation of the homoallylic alcohol, terpinen-4-ol 1 (R=H) has been achieved. Thus, the enantiomeric triols 2a and 2b were separately synthesized in high yield and with high stereoselectivity by trans-dihydroxylation of the enantiomeric (4S)-terpinen-4-ol 1a (R=H), and (4R)-terpinen-4-ol 1b (R=H...
Article
Lavandulol, a constituent of lavander oil [1] possesses un unusual monoterpene skeleton and is used as an important additive in the perfume industry. In our research study, rye obtained this compound by Prins reaction, starting from natural citral in four steps and 30% overall yield.
Article
Lavandulol, n constituent of lavander oil [1] possesses un unusual monoterpene skeleton and is used as an important additive in the perfume industry. In our research study, we obtained this compound by Prins reaction, starting from natural citral in four steps and 30% overall yield.
Article
1-(Acridin-9'-yl)-3-methylpyrazolin-5-ones 3 a-c were synthesised by cyclocondensation of 9-hydrazinoacridine derivatives 1a-c with ethylacetoacetate in NaOH methanolic solution and 1-(acridin-9'-yl)-5-methylpyrazolin-3-ones 4a-c respectively, by arylation of 3-methyl-5-pyrazolone 5 with 9-chloroacridine derivatives 6a-c. The structural assignments...

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