Search results for: Dietrich R.T. Zahn

Items from 1 to 20 out of 68 results

article

Synthesis and Optical Properties of Ag–Ga–S Quantum Dots

Yuriy Azhniuk, Bohdana Lopushanska, Oleksandr Selyshchev, Yevhenii Havryliuk, more

physica status solidi (b) > 259 > 10 > n/a - n/a

Ag–Ga–S quantum dots (QDs) are obtained by colloidal synthesis in aqueous solutions with glutathione ligands at mild conditions. The QDs can be assigned to metastable orthorhombic, rhombohedral, or rocksalt‐type phases, assuming a significant internal pressure within crystallites, while the conventional tetragonal AgGaS₂ phase is less likely formed. Similarly to these metastable phases, the QDs reveal...

article

Optical Properties and Lattice Dynamics of Pure and S‐Alloyed Cu–Zn–Sn–Te Semiconductors: First‐Principles Calculations and Raman Scattering

Alexander P. Litvinchuk, Volodymyr Dzhagan, Nazar Mazur, Volodymyr O. Yukhymchuk, more

physica status solidi (b) > 259 > 6 > n/a - n/a

The electronic band structure, the optical properties, and the lattice dynamics of the quaternary Cu₂ZnSnTe₄ (CZTTe) semiconductor with kesterite crystallographic structure are calculated within first principles. The analysis of the phonon partial density of states shows that the highest frequency phonon mode involves mostly heavy Sn and Te atoms due to their exceptionally strong bonding. Experimental...

article

La_1−xSr_xMnO₃ Thin Films on Silicon Prepared by Magnetron Sputtering: Optimization of the Film Structure and Magnetic Properties by Postdeposition Annealing

Manuel Monecke, Peter Richter, Daniel Bülz, Peter Robaschik, more

physica status solidi (b) > 258 > 12 > n/a - n/a

Herein, a systematic study of postdeposition annealing for La_1−xSr_xMnO₃ (LSMO) films regarding their structural, electronic, (magneto‐)optical, and magnetic properties is presented. The samples are prepared by magnetron sputtering at room temperature on silicon (111) substrates with native oxide and are annealed in ambient atmosphere for 12 h in a temperature range from 600 to 875 °C. The stoichiometry...

article

Ternary CdS_1–xSe_x nanocrystals formed in Cd‐doped As–Se–S films due to photoenhanced diffusion during micro‐Raman measurement

Yuriy M. Azhniuk, Volodymyr M. Dzhagan, Dmytro Solonenko, Vasyl V. Lopushansky, more

Journal of Raman Spectroscopy > 52 > 4 > 821 - 832

Micro‐Raman spectra of amorphous As–Se–S:Cd films prepared by thermal evaporation on silicon and silicate glass substrates measured at different laser power densities show the formation of CdS_1–xSe_x nanocrystals in the As–Se–S:Cd film under laser beam illumination due to a photoinduced material transfer and photoenhanced diffusion in the laser spot area. The material transfer and the photoenhanced...

article

Structure and vibrational spectra of ReSe₂ nanoplates

Volodymyr O. Yukhymchuk, Leonid M. Kulikov, Mykhailo Y. Valakh, Alexander P. Litvinchuk, more

Journal of Raman Spectroscopy > 51 > 8 > 1305 - 1314

Theoretical and experimental vibrational spectra of ReSe₂ nanocrystals, synthesized by self‐limited chemical vapor deposition (CVD), are reported. Scanning electron microscopy reveals that the nanocrystals have the shape of polygon nanoplates (NPs), 20 nm thick and about 100–300 nm wide. X‐ray diffraction studies determined their triclinic structure (space group, P‐1 [no. 2]). The wavenumbers of the...

article

Low-temperature Raman studies of sulfur-rich TlIn(S1−xSex)2 single crystals

Oleksandr O. Gomonnai, Michael Ludemann, Alexander V. Gomonnai, Ivan Yu. Roman, more

Vibrational Spectroscopy > 2018 > 97 > C > 114-118

Raman spectra of TlIn(S_1–_xSe_x)₂ (0 ≤ x ≤ 0.25) single crystals in the frequency range 16–400 cm⁻¹ were studied at T  = 30 K in the Z(XX+XY)Z¯ configuration. The experimental Raman spectra of TlIn(S_1-xSe_x)₂ single crystals were analyzed by multi-peak simulation by Lorentzian contours, enabling the peak frequencies, halfwidths and intensities to be determined. Their compositional dependences were studied...

article

Surfaces functionalized by graphene oxide nanosheets for single cell investigations

Lina Dedelaite, Raul D. Rodriguez, Eivydas Andriukonis, Michael Hietschold, more

Sensors and Actuators B: Chemical > 2018 > 255 > P2 > 1735-1743

In this research development of sensor suitable for single cell investigation is reported. To achieve this goal biocompatible graphene oxide (GO) nanosheets were applied as substrates for separated cell immobilization. GO nanosheets are particularly interesting due to their biocompatibility, scalability, and possibility to be deposited via simple surface functionalization protocols. In this context,...

article

Polycrystalline La1-xSrxMnO3 films on silicon: Influence of post-Deposition annealing on structural, (Magneto-)Optical, and (Magneto-)Electrical properties

Patrick Thoma, Manuel Monecke, Oana-Maria Buja, Dmytro Solonenko, more

Applied Surface Science > 2018 > 427 > PA > 533-540

The integration of La_1-xSr_xMnO₃ (LSMO) thin film technology into established industrial silicon processes is regarded as challenging due to lattice mismatch, thermal expansion, and chemical reactions at the interface of LSMO and silicon. In this work, we investigated the physical properties of thin La_0.73Sr_0.27MnO₃ films deposited by magnetron sputtering on silicon without a lattice matching buffer...

article

Stress imaging in structural challenging MEMS with high sensitivity using micro-Raman spectroscopy

Peter Meszmer, Raul D. Rodriguez, Evgeniya Sheremet, Dietrich R.T. Zahn, more

Microelectronics Reliability > 2017 > 79 > C > 104-110

The development cycle of microelectromechanical systems (MEMS) includes several numerical simulation and optimization iterations. To verify and calibrate the models with experimental data, the non-destructive measurement and imaging of stress distribution in structural challenging regions with high sensitivity is of great importance. This is possible to achieve using micro-Raman spectroscopy. Due...

article

Tuning the adhesion between polyimide substrate and MWCNTs/epoxy nanocomposite by surface treatment

Ayda Bouhamed, Alireza Mohammadian Kia, Slim Naifar, Volodymyr Dzhagan, more

Applied Surface Science > 2017 > 422 > C > 420-429

MWCNTs/epoxy nanocomposite thin films are coated on the polyimide (PI) flexible substrate, to be used as a strain sensor. Previous studies showed that the adhesion between polyimide and other materials are very poor. In this work, two approaches, oxygen plasma cleaning and simple solvent cleaning are performed for activation of the polyimide surface. In order to understand the impact of both cleaning...

article

Optical and photoelectrochemical characterization of pulsed laser deposited Bi4V2O11, BICUVOX, and BIZNVOX

Konrad Trzciński, Jacek Gasiorowski, Anna Borowska-Centkowska, Mariusz Szkoda, more

Thin Solid Films > 2017 > 638 > C > 251-257

Thin layers of three compounds from the BIMEVOX family (Bi₄V₂O₁₁, Bi₂V_0.9Cu_0.1O_5.35, and Bi₂V_0.9Zn_0.1O_5.35) were prepared via pulsed laser deposition technique on quartz, silicon, and platinum foil and tested as photoanodes for water photooxidation. The film formation, as well as the crystallization upon heating, was characterized using X-ray diffraction and Raman spectroscopy. The optical properties...

article

Enhanced targeting of invasive glioblastoma cells by peptide-functionalized gold nanorods in hydrogel-based 3D cultures

Diana P.N. Gonçalves, Raul D. Rodriguez, Thomas Kurth, Laura J. Bray, more

Acta Biomaterialia > 2017 > 58 > C > 12-25

Cancer stem cells (CSCs) are responsible for drug resistance, tumor recurrence, and metastasis in several cancer types, making their eradication a primary objective in cancer therapy. Glioblastoma Multiforme (GBM) tumors are usually composed of a highly infiltrating CSC subpopulation, which has Nestin as a putative marker. Since the majority of these infiltrating cells are able to elude conventional...

article

Photocatalytic H2 production from aqueous solutions of hydrazine and its derivatives in the presence of nitric-acid-activated graphitic carbon nitride

Alexandra E. Raevskaya, Yaroslav V. Panasiuk, Ganna V. Korzhak, Oleksandr L. Stroyuk, more

Catalysis Today > 2017 > 284 > C > 229-235

A treatment of graphitic carbon nitride (GCN) with concentrated nitric acid imparts GCN with the photocatalytic activity in hydrogen evolution from aqueous solutions of hydrazine hydrate, unsymmetric dimethylhydrazine (DMH) and hydrazinium sulfate under illumination with the UV light and in the presence of a Pd/SiO₂ co-catalyst. The rate of photocatalytic water reduction was found to be maximal in...

article

Glass‐embedded quaternary CdS_1−x−ySe_xTe_y nanocrystals: Chemical composition derived from the Raman band intensities

Yuriy M. Azhniuk, Vasyl V. Lopushansky, Mykola V. Prymak, Alexander V. Gomonnai, more

Journal of Raman Spectroscopy > 48 > 3 > 485 - 493

Quaternary CdS_1−x−ySe_xTe_y nanocrystals are obtained in borosilicate glass by diffusion‐limited growth. In their micro‐Raman spectra CdTe‐like, CdSe‐like, and CdS‐like LO phonon bands are observed providing evidence for a three‐mode character of the compositional transformation of their phonon spectra. An attempt is made to quantify the nanocrystal chemical composition based on the corresponding LO...

article

Probing the structure of CuInS2-ZnS core-shell and similar nanocrystals by Raman spectroscopy

Volodymyr Dzhagan, Björn Kempken, Mykhailo Valakh, Jürgen Parisi, more

Applied Surface Science > 2017 > 395 > C > 24-28

CuInS₂/ZnS core-shell and alloyed nanocrystals (NCs) are promising candidates for applications in biolabeling, photocatalysis, solar energy conversion, and light emitting diodes. The growth mechanism and subsequent internal structure of such heterogeneous NCs are therefore of crucial importance, as it strongly affects their optical and electronic properties. Here, we investigated using resonant Raman...

article

Gaede‐Preis 2017

Richard Berndt, Dietrich RT Zahn

Vakuum in Forschung und Praxis > 29 > 1 > 13 - 13

article

Photovoltaic cells based on ternary P3HT:PCBM:polymethine dye active layer transparent in the visible range of light

Valery N. Bliznyuk, Jacek Gasiorowski, Alexander A. Ishchenko, Gennadiy V. Bulavko, more

Applied Surface Science > 2016 > 389 > C > 419-427

Optical and photovoltaic properties were studied for ternary photovoltaic cells containing a traditional donor-acceptor bulk-heterojunction (BHJ) active layer modified with polymethine dye molecules in a broad range of compositions and wavelengths. An effect of composition induced optical transparency, due to the strong modification of the density of states, was observed for symmetrical compositions...

article

Optical and magneto-optical properties of spin coated films of novel trinuclear bis(oxamato) and bis(oxamidato) type complexes

Mohammad A. Abdulmalic, Michael Fronk, Björn Bräuer, Dietrich R.T. Zahn, more

Journal of Magnetism and Magnetic Materials > 2016 > 419 > C > 17-28

This work reports the first example of the spectroscopic measurements of the Magneto-Optical Kerr Effect (MOKE) of films being composed of trinuclear transition metal complexes on a non-transparent substrate at room temperature. The thin films of the tailor-made trinuclear bis(oxamidato) type complex 5 ([Cu₃(opboⁿPr₂)(tmcd)₂(NO₃)₂], opboⁿPr₂ = o-phenylenebis(N’-ⁿpropyloxamido, tmcd=trans-(1R,2R)-N,N,N′,N′-tetramethyl-cyclohexanediamine)...

article

Mechanical properties and applications of custom-built gold AFM cantilevers

Vladimir A. Kolchuzhin, Evgeniya Sheremet, Kunal Bhattacharya, Raul D. Rodriguez, more

Mechatronics > 2016 > 40 > C > 281-286

Silicon and silicon nitride metal-coated cantilevers have been in use for a long time in several scanning probe microscopy applications that require electrically conductive probes. However, conventional metalized cantilevers present several drawbacks such as limited life-time of the metal layer due to wear, and increased tip radius. This work focuses on monolithic metallic cantilevers developed in...

article

Resonant surface-enhanced Raman scattering by optical phonons in a monolayer of CdSe nanocrystals on Au nanocluster arrays

Alexander G. Milekhin, Larisa L. Sveshnikova, Tatyana A. Duda, Ekaterina E. Rodyakina, more

Applied Surface Science > 2016 > 370 > C > 410-417

Here we present the results on an investigation of resonant Stokes and anti- Stokes surface-enhanced Raman scattering (SERS) by optical phonons in colloidal CdSe nanocrystals (NCs) homogeneously deposited on arrays of Au nanoclusters using the Langmuir–Blodgett technology. The thickness of deposited NCs, determined by transmission and scanning electron microscopy, amounts to approximately 1 monolayer...

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INFONA - science communication portal

Search results for: Dietrich R.T. Zahn

Synthesis and Optical Properties of Ag–Ga–S Quantum Dots

Optical Properties and Lattice Dynamics of Pure and S‐Alloyed Cu–Zn–Sn–Te Semiconductors: First‐Principles Calculations and Raman Scattering

La_1−xSr_xMnO₃ Thin Films on Silicon Prepared by Magnetron Sputtering: Optimization of the Film Structure and Magnetic Properties by Postdeposition Annealing

Ternary CdS_1–xSe_x nanocrystals formed in Cd‐doped As–Se–S films due to photoenhanced diffusion during micro‐Raman measurement

Structure and vibrational spectra of ReSe₂ nanoplates

Low-temperature Raman studies of sulfur-rich TlIn(S1−xSex)2 single crystals

Surfaces functionalized by graphene oxide nanosheets for single cell investigations

Polycrystalline La1-xSrxMnO3 films on silicon: Influence of post-Deposition annealing on structural, (Magneto-)Optical, and (Magneto-)Electrical properties

Stress imaging in structural challenging MEMS with high sensitivity using micro-Raman spectroscopy

Tuning the adhesion between polyimide substrate and MWCNTs/epoxy nanocomposite by surface treatment

Optical and photoelectrochemical characterization of pulsed laser deposited Bi4V2O11, BICUVOX, and BIZNVOX

Enhanced targeting of invasive glioblastoma cells by peptide-functionalized gold nanorods in hydrogel-based 3D cultures

Photocatalytic H2 production from aqueous solutions of hydrazine and its derivatives in the presence of nitric-acid-activated graphitic carbon nitride

Glass‐embedded quaternary CdS_1−x−ySe_xTe_y nanocrystals: Chemical composition derived from the Raman band intensities

Probing the structure of CuInS2-ZnS core-shell and similar nanocrystals by Raman spectroscopy

Gaede‐Preis 2017

Photovoltaic cells based on ternary P3HT:PCBM:polymethine dye active layer transparent in the visible range of light

Optical and magneto-optical properties of spin coated films of novel trinuclear bis(oxamato) and bis(oxamidato) type complexes

Mechanical properties and applications of custom-built gold AFM cantilevers

Resonant surface-enhanced Raman scattering by optical phonons in a monolayer of CdSe nanocrystals on Au nanocluster arrays

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