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Running projects and research grants
Project title: Multicomponent Functional Nanostructures
Project ID: OTKA FK142148
Duration: 2022.10.01.-2026.09.31.
Funders: National Research, Development and Innovation Fund
Project title: Novel Semiconducting Materials
Project ID: TKA2021-NKTA-05
Duration: 2022.01.01.-2025.12.31.
Funders: Ministry of Innovation and Technology of Hungary - National Research, Development and Innovation Fund
Project title: Infrastructural Instrumentation Grant
Project ID: Acquisition of an Edinburgh FS5 spectrofluorometer with integrating sphere and TCSPC electronics
Duration: 2021
Funders: Centre for Energy Research, Eötvös Lóránd Research Network
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Nanoparticles and structures from the lab
Plasmonic gold nanoparticles with different shape, size and functionality are synthesized by wet chemical approaches. Silica nanoparticles and their Langmuir-Blodgett films. Semiconductor quantum dots, rods and nanoplatelets. Solvogels and highly porous, self-supported aerogels from semiconductor and plasmonic building blocks. Printed xero- and aerogel films on conductive substrates.
Cu2S quantum-dot superstructures: photoassisted transformation of Cu2O nanooctahedra in the presence of a short chain thiol
In contast to the classical sulfidation routes of transition metal oxides (S2-, H2S, NaSH), we have shown that Cu2O nanooctahedra can be sulfidized to phase pure Cu2O quantum-dot superstructures in a controlled manner. The inspiration of this work was the natural sulfidation reaction of Cu2O involving atmospheric sulfur compounds. The novel material possess electrochemical activity upon depositing them onto conductive substrate.
Related paper:
Multimetallic nanoparticles with micro- and mesoporosity and enhanced electrocatalytic performance
Based on Au nanoparticles with different morphology, the growth of a trimetallic porous shell consisting of Pd, Pt and Ir has been achieved. These particles are of great interest in numerous catalytic applications, such as pollutant degradation, p-nitrophenol reduction, ethanol oxidation reaction, methanol oxidation reaction and formic acid electrooxidation. The morphology plays an inevitable role in designing such particles and to boost their performance. Using conductive substrate, the particles can be easily deposited to fabricate electrodes without binder molecules or external trigger. Combining small Pd and Pt particles in a form of a cryogel has also been a promising route to fabricate novel electrodes for electrooxidation reactions.
Related papers:
Cuprous oxide/noble metal heteroparticles - control over growth, optics and catalytic properteis
In the recent years, we have invested a lot of effort to study the synthesis and structure-property correlation of Cu2O/Au heterosystems. Cu2O octahedra, Cu2O@Au nanograins, Cu2O@AuPrism systems have been investigated and utilized in photocatalysis and novel optical and structural features are revealed.
Related papers:
Transition metal oxide-based multicomponent nanoparticles
Structural, optical, photophysical and photocatalytic properties of shape-controlled transition metal oxide nanoparticles combined with noble metal nanoparticles are in the recent focus of the group. We are especially interested in charge-carrier extraction processes in order to enhance the activity of oxide NPs in photocatalytic applications.
Related paper: http://xlink.rsc.org/?DOI=D3TC01213A
Interconnected semidonductor nanorods in a gel network
The crystal contact between the nanoparticles in the hyperbranched network enables the enhanced mobility of the charge carriers upon illumination. It is of special importance in extracting photogenerated electrons from CdSe/CdS/Au or Pt multicomponent systems.
Related papers:
https://onlinelibrary.wiley.com/doi/abs/10.1002/smll.201906934
https://onlinelibrary.wiley.com/doi/10.1002/adom.202100291
https://onlinelibrary.wiley.com/doi/10.1002/adfm.202101628
https://onlinelibrary.wiley.com/doi/10.1002/adom.202101712
https://onlinelibrary.wiley.com/doi/10.1002/smll.202206818
https://onlinelibrary.wiley.com/doi/10.1002/sstr.202300186
https://onlinelibrary.wiley.com/doi/full/10.1002/sstr.202300225
Noble metal nanorod networks as novel electrocatalysts
Eletrocatalytic activity of Au and Au/Ag nanorods have been investigated as a form of cryoaerogels on conductive substrate. AuNRs serve as promising catalysts for EOR and glucose sensing.
Related paper:
Monitoring ligand exchange reactions at the single particle level
Anchoring different thiols on the surface of gold nanoprisms has been monitored in situ by single particle microspectroscopy at the single nanoprism level to reveal the kinetics and the patch formation during the ligand exchange process. These patchy particle can later serve as a new platform for directed self-assembly experiments via modulated electrostatic interactions.
Related paper:
https://onlinelibrary.wiley.com/doi/10.1002/ppsc.202200197
+ additional paper under review currently
Colloidal interaction calculations
Relevant interparticle interactions are calculated and predicted in order to investigate the possibilities to obtain soft-sphere type interaction. These interaction potential profile is essential to prepare compact, three-dimensional nanoparticle clusters.
Related papers:
https://pubs.acs.org/doi/10.1021/la504600j
http://pubs.rsc.org/en/content/articlelanding/2016/ra/c6ra03902b
Nanostructured interface for Surface-Enhanced Raman Scattering
Precisely fabricated periodic gold nanovoid structure enables the detection of low amount of Raman active molecules if gold nanoparticles are applied as Raman reporter carriers.
Related papers:
Clustering of NPs by fine-tuning colloidal interactions
Self-assembly of spherical gold nanoparticles with different size modified by methoxy-poly(ethlylene glycol) can be triggered via external stimuli. The kinetics of the aggregation and the structure of the evolved clusters can be influenced by the control parameters (ionic strength and temperature).
Related papers:
https://pubs.acs.org/doi/10.1021/la504600j
http://pubs.rsc.org/en/content/articlelanding/2016/ra/c6ra03902b
Optical simulations: self-assembly relevant model structures
Extinction spectra of self-assembly relevant gold nanoassemblies are simulated to map the optical response of chains, heptamers and 3D clusters with different NP-NP distances. Near-field plots give information about pasmon coupling and enhancement.
Related paper:
Capillary lithography: nanorings and their optical properties
Gold nanoparticles can be used as tracer objects to identify the dewetting stages of the capillary lithography process. Single chain gold nanoparticle rings were prepared with tunable internal radii by capillary lithography and the optical response of the rings were measured by single particle spectroscopy.
Related paper:
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