Anastasios Stergiou

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• PhD in Chemistry
• MSCA-EF Postdoctoral Fellow at Politecnico di Milano

Hybrid Organic‐Inorganic Halide Perovskites (HOIHPs) represent an emerging class of semiconducting materials, widely employed in a variety of optoelectronic applications. Despite their skyrocket growth in the last decade, a detailed understanding on their structure–property relationships is still missing. In this communication, we report two unprec...

The covalent modification of the metallic phase of MoS2 with a Hamilton‐type ligand is presented, transforming MoS2 to a recognition platform which is able to embrace barbiturate moieties via hydrogen bonding. The successful hydrogen bonding formation is easily monitored by simple electrochemical assessments, if a ferrocene‐labeled barbiturate anal...

The purpose of this study was to physically process Hi-maize 260® granules and investigate the size reduction towards obtaining starch nano-particles, stable in aqueous suspensions. We developed a novel sequential threestep physical process consisting of hydrothermal gelatinization, nano-precipitation and ultrasonic treatment. Ultrasonication prove...

While graphene-based materials hold a strong potential as electrocatalysts, owing to their astonishing properties and functionalization capability, their intrinsic catalytic activity is more often masked under the umbrella of the precious and industrial metals that are used as counterparts for boosting the electrocatalytic performance. In the prese...

Development of graphene/perovskite heterostructures mediated by polymeric materials may constitute a robust strategy to resolve the environmental instability of metal halide perovskites and provide barrierless charge transport. Herein, a straightforward approach for the growth of per-ovskite nano-crystals and their electronic communication with gra...

Development of synthetic strategies towards two-dimensional laminar transition metal dichalcogenide/graphene heterostructures is of particular interest for the electrocatalysis of the hydrogen evolution reaction (HER). Herein, we describe the preparation of...

Covalent functionalization of chemically exfoliated molydbenum disulfide (ce-MoS2) with hydrophobic poly(methyl methacrylate) and hydrophilic poly(acrylic acid) polymers, in a single-step without additives, is presented. The nature of chemical modification and the impact on the structure of ce-MoS2 were spectroscopically investigated. Complexation...

Molecular entities with robust spin-1/2 are natural two-level quantum systems for realizing qubits and are key ingredients of emerging quantum technologies such as quantum computing. Here we show that robust and abundant spin-1/2 species can be created in situ in the solid state from spin-active azafullerene C59N cages supramolecularly hosted in cr...

The multiaddition chemistry of azafullerene C59N has been scarcely explored, and the isolation of pure bisadducts is in its infancy. Encouraged by the recent regioselective synthesis of the inherently chiral equatorialface bisadduct of C59N, we focused on the isolation of the first trans‐4 bisadduct in a simple two‐step approach. The first regiosel...

The electron transport layer (ETL) plays a pivotal role in obtaining perovskite solar cells (PSCs) with high power conversion efficiency (PCE). Titanium dioxide is a widely used ETL, however it suffers from low electron mobility, poor conductivity and may act as a photocatalyst of chemical reactions leading to degradation of the perovskite. Herein,...

We describe the basal plane functionalization of chemically exfoliated molybdenum disulfide (ce-MoS2) nanosheets with a benzo-15-crown-5 ether (B15C5), promoted by the chemistry of diazonium salts en route to the fabrication and electrochemical assessment of an ion-responsive electrode. The success of the chemical modification of ce-MoS2 nanosheets...

Carbon dots (CDs) are a booming material and the most recent incomer in the big family of carbon nanostructures. Specifically, CDs are nanosized fluorescent core‐shell nanoparticles with tunable absorption and emission spectra, with high solubility in aqueous media and common organic solvents. Herein, the origins and the development of these unique...

Carbon nanohorns (CNHs) resembling a single-layered graphene sheet wrapped in a conical shape can be chemically modified in order to immobilize, carry, and release biologically active molecules. Here, we describe the major routes for the preparation of CNH-based drug delivery platforms, via covalent coupling and encapsulation, proficient to facilit...

A face-to-face porphyrin dimer, (H2P)2 “porphyrin tweezer”, was explored as a photo- and redox-responsive host for the molecular recognition of an azafullerene (C59N) derivative bearing an amphoteric pentafluoroquinoline (FQ) domain. The intramolecular electronic coupling between the FQ substituent and the C59N cage, within the newly synthesized C5...

The photovoltaic efficiency and stability challenges encountered in perovskite solar cells (PSCs) were addressed by an innovative interface engineering approach involving the utilization of the organic chromophore (E)-3-(5-(4-(bis(2',4'-dibutoxy-[1,1'-biphenyl]-4-yl)amino)phenyl)thiophen-2-yl)-2-cyanoacrylic acid (D35) as an interlayer between the...

Chemical functionalization of graphene aims at tailoring its properties and to promote its use in an array of different application fields through the attachment of different functional groups. In this review, we attempt to detail the major synthetic routes that are employed for the covalent functionalization of graphene. Additionally, we aim to pr...

Mixed halide hybrid perovskites are strong candidates for fabrication of efficient, stable and reproducible perovskite solar cells (PSCs). To restrain intrinsic volatility and ionic migration effects, we report for the first time a dimensionality engineering approach consisting of a (FA/MA/Cs) PbI3-xBrx/(CH3)3SPbI3 (3D/1D) perovskite bilayer archit...

Molybdenum disulfide nanosheets covalently modified with porphyrin were prepared and fully characterized. Neither the porphyrin absorption nor its fluorescence was notably affected by covalent linkage to MoS2. The use of transient absorption spectroscopy showed that a complex ping‐pong energy‐transfer mechanism, namely from the porphyrin to MoS2 an...

A major handicap towards the exploitation of radicals is their inherent instability. In the paramagnetic azafullerenyl radical C59N., the unpaired electron is strongly localized next to the nitrogen atom, which induces dimerization to diamagnetic bis(azafullerene), (C59N)2. Conventional stabilization by introducing steric hindrance around the radic...

The field of catalytic organic transformations is highly challenging in terms of developing low-cost, highly efficient durable catalysts with diminutive toxicity for the ecosystem. Modern chemistry focuses into atom economy, the so-called “green philosophy”, in order to meet these objectives. The quest of “greener” synthesis is driven by the advanc...

Bisazafullerene (C59N)2 has been functionalized under aerobic conditions with cyclo‐[2]‐octylmalonate through a Mannich‐type reaction, furnishing the corresponding monoadduct. A regioselective tether‐directed Bingel cyclopropanation reaction was then carried out on the azafullerene core to yield a single bisadduct. Spectroscopic analysis of the for...

Heteroatom-doped graphene-based materials attract great interest as non-metal electrocatalysts for the oxygen reduction reaction (ORR). In this work, a straightforward approach was described to prepare nanoensembles of star-shaped oligothiophene 1 supramolecularly immobilized on sulfur-doped graphene sheets (SG). The 1/SG ensemble was comprehensive...

Molybdenum disulfide (MoS2) nanosheets have attracted great scientific interest for their remarkable electronic and optical properties. During the last few years significant progress on exfoliation methods of those nanosheets allowed the development of surface functionalization in covalent or non‐covalent fashion. Markedly, the chemical modificatio...

The game‐changing role of graphene oxide (GO) in tuning the excitonic behavior of conjugated polymer nanoparticles is described for the first time. This is demonstrated by using poly(3‐hexylthiophene) (P3HT) as a benchmark conjugated polymer and employing an in situ reprecipitation approach resulting in P3HT nanoparticles (P3HTNPs) with sizes of 50...

Catalysis, as a general topic, concerns a wide range of chemical processes, which may be in either homogeneous or heterogeneous modes of reaction. A major goal in related research involves the substitution of rare and expensive metal nanoparticle catalysts with alternative nanostructured materials, based on abundant elements. To this end, a lot of...

Sequential photoinduced energy transfer followed by electron transfer leading to the formation of charge separated states in a newly assembled series of supramolecular triads comprised of boron dipyrromethenes (BODIPY or BDP), aluminum porphyrin (AlTPP) and C60 is demonstrated. In the present strategy, the energy donor (BDP) and electron acceptor (...

Metal nanoclusters (MNCs) based on silver and gold, abbreviated as AgNCs and AuNCs, respectively, were synthesized and combined with functionalized graphene, abbreviated as f-G, forming novel MNCs/f-G ensembles. The preparation of MNCs/f-G was achieved by employing attractive electrostatic interactions developed between negatively charged MNCs, owe...

A facile approach for introducing photoactive poly-(fluorene-perylene diimide) arrays (PFPDI) onto graphene sheets was accomplished. Non-covalent PFPDI/graphene ensembles formed via π-π stacking interactions between the two components, and covalent PFPDI-graphene hybrids realized upon a Stille polycondensation reaction between an iodobenzyl-functio...

A facile approach to individualize spherically aggregated pristine carbon nanohorns (pr-CNHs) was established. Specifically, we found that treatment of pr-CNHs with chlorosulfonic acid generates positively charged polarized species, which disintegrate toward individualized carbon nanohorns (in-CNHs). Interestingly, the isolated in-CNHs were reveale...

The supramolecular association of an oligophenylene-vinylene (OPV)-based Hamilton-type receptor with C60-barbiturate , via six hydrogen bonds per OPV terminal, forming C60/OPV/C60 complex is presented. The particular host-guest motif expressed in ensures strong interactions between the discrete components of the complex based on the multiple hydrog...

Graphene research and in particular the topic of chemical functionalization of graphene has exploded in the last decade. The main aim is to increase the solubility and thereby enhance the processability of the material, which is otherwise insoluble and inapplicable for technological applications when stacked in the form of graphite. To this end, in...

Advances in organic synthetic chemistry combined with the exceptional electronic properties of carbon allotropes, particularly graphene, is the basis to design and fabricate novel electron donor-acceptor ensembles with desired properties for technological applications. Thiophene-based materials, mainly thiophene-containing polymers, are known for t...