Search results for: Andrzej Kudelski

Items from 1 to 20 out of 54 results

article

Dipyramidal-Au@SiO2 nanostructures: New efficient electromagnetic nanoresonators for Raman spectroscopy analysis of surfaces

Karol Kołątaj, Jan Krajczewski, Andrzej Kudelski

Applied Surface Science > 2018 > 456 > C > 932-940

Plasmonic structures act as electromagnetic nanoresonators leading to a local enhancement of the intensity of the electric field of the incident radiation, which leads to an increase in the efficiency of Raman scattering for molecules in close proximity to such nanoresonators. Because many biological molecules can change their structure during interaction with metal surfaces, plasmonic nanostructures...

article

Influence of amine and thiol modifications at the 3′ ends of single stranded DNA molecules on their adsorption on gold surface and the efficiency of their hybridization

Aleksandra Jaworska, Anna Jablonska, Tomasz Wilanowski, Barbara Palys, more

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy > 2018 > 203 > C > 31-39

Adsorption of molecules of DNA (deoxyribonucleic acid) or modified DNA on gold surfaces is often the first step in construction of many various biosensors, including biosensors for detection of DNA with a particular sequence. In this work we study the influence of amine and thiol modifications at the 3′ ends of single stranded DNA (ssDNA) molecules on their adsorption on the surface of gold substrates...

article

Modification of surfaces of silver nanoparticles for controlled deposition of silicon, manganese, and titanium dioxides

Heman Burhanalden Abdulrahman, Jan Krajczewski, Andrzej Kudelski

Applied Surface Science > 2018 > 427 > PB > 334-339

In this work we show that nanometric-thick layers of SiO₂, MnO₂, and TiO₂ may be effectively deposited on various silver nanoparticles (including cubic Ag nanoparticles) covered by a very thin (below 0.4nm) layer of silver sulphide. The background in Raman measurements generated by sulphide-protected Ag nanoparticles is significantly smaller than that for analogous Ag nanoparticles protected by a...

article

Influence of the silver deposition method on the activity of platforms for chemometric surface-enhanced Raman scattering measurements: Silver films on ZrO2 nanopore arrays

Marcin Pisarek, Jan Krajczewski, Ewa Wierzbicka, Marcin Hołdyński, more

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy > 2017 > 182 > C > 124-129

Deposition of plazmonic metal nanoparticles on nanostructured oxide templates is an important part in preparation and design of suitable substrates for surface-enhanced Raman scattering (SERS) measurements. In this contribution we analyze the influence of the Ag deposition methods (magnetron sputtering and evaporation in vacuum, which are often used interchangeably) on SERS activity of the resultant...

article

Enhanced catalytic activity of solid and hollow platinum-cobalt nanoparticles towards reduction of 4-nitrophenol

Jan Krajczewski, Karol Kołątaj, Andrzej Kudelski

Applied Surface Science > 2016 > 388 > PB > 624-630

Previous investigations of hollow platinum nanoparticles have shown that such nanostructures are more active catalysts than their solid counterparts towards the following electrochemical reactions: reduction of oxygen, evolution of hydrogen, and oxidation of borohydride, methanol and formic acid. In this work we show that synthesised using standard galvanic replacement reaction (with Co templates)...

article

The role of oxygen in plasmon-driven transformation of silver nanoparticles

Jan Krajczewski, Karol Kołątaj, Sylwia Parzyszek, Heman Burhanalden Abdulrahman, more

Applied Surface Science > 2016 > 388 > PB > 710-715

Plasmon-driven transformation (PDTr) of silver nanoparticles is a very valuable tool for formation of various anisotropic silver nanostructures. PDTr involves two steps: slow surface dissolution of silver nanoparticles, and redeposition of dissolved silver by the photocatalytic reduction of Ag⁺ cations. Photocatalytic reduction of Ag⁺ occurs preferentially at such places of silver nanostructures,...

article

MnO2-protected silver nanoparticles: New electromagnetic nanoresonators for Raman analysis of surfaces in basis environment

Heman Burhanalden Abdulrahman, Karol Kołątaj, Paweł Lenczewski, Jan Krajczewski, more

Applied Surface Science > 2016 > 388 > PB > 704-709

The first example of the synthesis of Ag nanoparticles protected by a few nanometers thick layer of MnO₂ (Ag@MnO₂) has been reported. Synthesized Ag@MnO₂ nanoparticles effectively locally enhance the electric field of the incident visible radiation, which allows, for example, for a large enhancement of the efficiency of Raman scattering for species located in the close proximity to such nanostructures...

article

Vibrational characterization of α-aminophosphinic acid derivatives of pyridine: DFT, Raman and SERS spectroscopy studies

Ewa PiĢta, Edyta Proniewicz, Andrzej Kudelski, Tomasz K. Olszewski, more

Vibrational Spectroscopy > 2016 > 83 > C > 115-125

This paper shows Fourier-transform Raman (FT⬜RS) and surface-enhanced Raman spectroscopy (SERS) studies of three α-aminophosphinic acid derivatives of pyridine: [(butylamino)(pyridin-2-yl)methyl]phenylphosphinic acid (α-PyNH), [(butylamino)(pyridin-3-yl)methyl]phenylphosphinic acid (β-PyNH), and [(benzylamino)(pyridin-4-yl)methyl]phenylphosphinic acid (γ-PyNH) immobilized onto colloidal sol nanoparticles...

article

Surface modification of nanoporous alumina layers by deposition of Ag nanoparticles. Effect of alumina pore diameter on the morphology of silver deposit and its influence on SERS activity

Marcin Pisarek, Robert Nowakowski, Andrzej Kudelski, Marcin Holdynski, more

Applied Surface Science > 2015 > 357 > PB > 1736-1742

Self-organized Al₂O₃ nanoporous/nanotubular (Al₂O₃-NP) oxide layers decorated with silver nanoparticles (Ag-NPs) exhibiting specific properties may serve as attractive SERS substrates for investigating the interactions between an adsorbate and adsorbent, or as stable platforms for detecting various organic compounds. This article presents the influence of the size of the alumina nanopores with a deposit...

chapter

Photochemical synthesis of different silver nanostructures

Jan Krajczewski, Karol Kolataj, Sylwia Parzyszek, Andrzej Kudelski

2015 IEEE 15th International Conference on Nanotechnology (IEEE-NANO) > 710 - 713

2015 IEEE 15th International Conference on Nanotechnology (IEEE-NANO)

Many silver nanostructures (e.g., triangular nanoprisms, nanorods) may be synthesized using photochemical reactions. Up to now such photochemical transformations of silver nanoparticles have been always carried out in the presence of dissolved oxygen. In this contribution we have shown that plasmon-driven transformation of silver nanoparticles can be carried out in the deoxidised solutions. We have...

chapter

Protected hollow metal nanoresonators for Raman analysis of surfaces

Heman Burhnalden Abdulrahman, Jan Krajczewski, Karol Kolataj, Andrzej Kudelski

2015 IEEE 15th International Conference on Nanotechnology (IEEE-NANO) > 342 - 345

2015 IEEE 15th International Conference on Nanotechnology (IEEE-NANO)

In this contribution we report the first example of Raman analysis of various surfaces using hollow-silver and hollow-gold nanoparticles protected by the silica layer. In contrast to solid spherical gold nanoparticles typically used for construction of nanoresonators for shell-isolated nanoparticle-enhanced Raman spectroscopy (SHINERS) measurements, for which a change of the diameter of the nanoparticle...

article

Light-induced growth of various silver seed nanoparticles: A simple method of synthesis of different silver colloidal SERS substrates

Jan Krajczewski, Karol Kołątaj, Andrzej Kudelski

Chemical Physics Letters > 2015 > 625 > C > 84-90

Plasmon-driven growth of various silver seed nanoparticles (spherical, flat and elongated) has been carried out in the solution containing silver cations and citrate. Although the growth of different seed nanoparticles has been carried out in the same conditions, the initial difference in the shape of seed nanoparticles leads to formation of different structures, which give significantly different...

article

Adsorption of CO on various M@Pt core–shell nanoparticles: Surface-enhanced infrared absorption and DFT studies

Sebastian Wojtysiak, Maciej Kamiński, Jan Krajczewski, Piotr Dłużewski, more

Vibrational Spectroscopy > 2014 > 75 > Complete > 11-18

Addition of some other metals to platinum causes significant increase of its catalytic activity towards ethanol electrochemical oxidation. This may be caused by different adsorption of CO molecules on the surface of the catalyst, and hence different resistance of the M@Pt nanostructures to poisoning by CO. In this work we attempt to verify this hypothesis analyzing vibrational spectra of CO adsorbed...

article

Light-induced transformation of citrate-stabilized silver nanoparticles: Photochemical method of increase of SERS activity of silver colloids

Jan Krajczewski, Valentin Joubert, Andrzej Kudelski

Colloids and Surfaces A: Physicochemical and Engineering Aspects > 2014 > 456 > Complete > 41-48

It is well known that silver sols are photochemically reconstructed. In this contribution we showed that light-induced transformation of citrate-stabilized silver sols may be used to cause their aggregation/agglomeration and hence their very efficient activation for surface-enhancement Raman scattering (SERS) measurements. In contrast to the chemical methods typically used for aggregation, there is...

article

Ag/ZrO2-NT/Zr hybrid material: A new platform for SERS measurements

Marcin Pisarek, Agata Roguska, Andrzej Kudelski, Marcin Holdynski, more

Vibrational Spectroscopy > 2014 > 71 > Complete > 85-90

In this paper, we present recent results of our attempts to produce nanoporous zirconia, as well as our investigations of a hybrid material consisting of nanoporous zirconia loaded with Ag-nanoparticles, Ag-n/ZrO ₂ -NT/Zr, which could be used as an active SERS substrate. The Zr-based hybrid material, as our investigations have shown, is an active and stable substrate in SERS investigations...

article

Preparation of silver hollow nanostructures by plasmon-driven transformation

Sławomir Stasieńko, Jan Krajczewski, Sebastian Wojtysiak, Krzysztof Czajkowski, more

Colloids and Surfaces A: Physicochemical and Engineering Aspects > 2014 > 443 > C > 102-108

Herein we demonstrate the synthesis of silver spherical hollow nanostructures by the plasmon-driven transformation (PDTr) of partially agglomerated silver sol. The PDTr process was carried out in the presence of oxygen and trisodium citrate using intensive 550–650nm light. In contrast to typical methods of the synthesis of metallic hollow nanostructures, no auxiliary template structures are used....

article

Synthesis of core–shell silver–platinum nanoparticles, improving shell integrity

Sebastian Wojtysiak, José Solla-Gullón, Piotr Dłużewski, Andrzej Kudelski

Colloids and Surfaces A: Physicochemical and Engineering Aspects > 2014 > 441 > C > 178-183

Silver–platinum core–shell (Ag@Pt) nanoparticles have been synthesized using various methods. In the case of Ag@Pt nanoparticles synthesized by the standard method based on the galvanic replacement reaction between Ag seeds and PtCl₄²⁻, transmission electron microscopy micrographs revealed well visible core–shell structure. However, electrochemical experiments showed that relatively large amount of...

article

TiO₂ and Al₂O₃ nanoporous oxide layers decorated with silver nanoparticles—active substrates for SERS measurements

Marcin Pisarek, Marcin Holdynski, Agata Roguska, Andrzej Kudelski, more

Journal of Solid State Electrochemistry > 2014 > 18 > 11 > 3099-3109

Self-organized nanoporous oxide layers (TiO₂, Al₂O₃) exhibiting specific properties, obtained by anodic oxidation at a constant voltage in neutral electrolyte, may serve as attractive SERS substrates for investigating the interactions between an adsorbate and adsorbent, or as a stable platform for detecting various organic compounds. This paper presents the influence of the size of the nanotubes/nanopores...

article

Surface-enhanced Raman scattering measurements on silver nanoparticles covered with differently formed platinum films

Sebastian Wojtysiak, Andrzej Kudelski

Vibrational Spectroscopy > 2013 > 68 > Complete > 153-157

Gold and silver electromagnetic nanoresonators covered by a thin layer of platinum are often used to study adsorption of various molecules on “model platinum surfaces” with surface-enhanced Raman scattering (SERS) spectroscopy. In this contribution spectra of pyridine adsorbed on films formed from core–shell Ag@Pt and Ag@Ag–Pt nanoparticles and pure Pt or Ag nanoparticles were measured using a confocal...

article

The role of Ag particles deposited on TiO2 or Al2O3 self-organized nanoporous layers in their behavior as SERS-active and biomedical substrates

Marcin Pisarek, Agata Roguska, Andrzej Kudelski, Mariusz Andrzejczuk, more

Materials Chemistry and Physics > 2013 > 139 > 1 > 55-65

In this paper, we present recent results of investigations of hybrid materials consisting of nanoporous oxides layers loaded with Ag nanoparticles: Ag/TiO ₂ -n/Ti and Ag/Al ₂ O ₃ -n/Al (where “n-“stands for nanotubes), which could be used as active SERS substrates or as bioactive materials in medicine (implants). Simple electrochemical, chemical and physical methods appear...

Publication date

Set your own date range

Data set

Elsevier (39)
ACS (8)
Wiley (3)
ieee (2)
Springer (2)

Journal

Vibrational Spectroscopy (11)
Applied Surface Science (7)
Chemical Physics Letters (6)
The Journal of Physical Chemistry B (6)
Surface Science (5)
Colloids and Surfaces A: Physicochemical and Engineering Aspects (4)
Journal of Raman Spectroscopy (3)
Journal of Solid State Electrochemistry (2)
Langmuir (2)
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy (2)
Electrochemistry Communications (1)
Journal of Electroanalytical Chemistry (1)
Materials Chemistry and Physics (1)
Talanta (1)
more

INFONA - science communication portal

Search results for: Andrzej Kudelski

Dipyramidal-Au@SiO2 nanostructures: New efficient electromagnetic nanoresonators for Raman spectroscopy analysis of surfaces

Influence of amine and thiol modifications at the 3′ ends of single stranded DNA molecules on their adsorption on gold surface and the efficiency of their hybridization

Modification of surfaces of silver nanoparticles for controlled deposition of silicon, manganese, and titanium dioxides

Influence of the silver deposition method on the activity of platforms for chemometric surface-enhanced Raman scattering measurements: Silver films on ZrO2 nanopore arrays

Enhanced catalytic activity of solid and hollow platinum-cobalt nanoparticles towards reduction of 4-nitrophenol

The role of oxygen in plasmon-driven transformation of silver nanoparticles

MnO2-protected silver nanoparticles: New electromagnetic nanoresonators for Raman analysis of surfaces in basis environment

Vibrational characterization of α-aminophosphinic acid derivatives of pyridine: DFT, Raman and SERS spectroscopy studies

Surface modification of nanoporous alumina layers by deposition of Ag nanoparticles. Effect of alumina pore diameter on the morphology of silver deposit and its influence on SERS activity

Photochemical synthesis of different silver nanostructures

Protected hollow metal nanoresonators for Raman analysis of surfaces

Light-induced growth of various silver seed nanoparticles: A simple method of synthesis of different silver colloidal SERS substrates

Adsorption of CO on various M@Pt core–shell nanoparticles: Surface-enhanced infrared absorption and DFT studies

Light-induced transformation of citrate-stabilized silver nanoparticles: Photochemical method of increase of SERS activity of silver colloids

Ag/ZrO2-NT/Zr hybrid material: A new platform for SERS measurements

Preparation of silver hollow nanostructures by plasmon-driven transformation

Synthesis of core–shell silver–platinum nanoparticles, improving shell integrity

TiO₂ and Al₂O₃ nanoporous oxide layers decorated with silver nanoparticles—active substrates for SERS measurements

Surface-enhanced Raman scattering measurements on silver nanoparticles covered with differently formed platinum films

The role of Ag particles deposited on TiO2 or Al2O3 self-organized nanoporous layers in their behavior as SERS-active and biomedical substrates

Filter options

Publication date

Content availability

Publication type

Keywords

Data set

Journal

INFONA - science communication portal

Search results for: Andrzej Kudelski

Add recipient

Sending message cancelled

Are you sure you want to cancel sending this message?

Send message

Filter options

Publication date

Date range setting

Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.

Content availability

Publication type

Keywords

Data set

Journal

Reporting an error / abuse

Sending the report failed

Accessibility options