A5054571205- Diamond and Carbon-based Materials Research
- Force Microscopy Techniques and Applications
- Metal and Thin Film Mechanics
- Carbon Nanotubes in Composites
- Semiconductor materials and interfaces
- Graphene and Nanomaterials Applications
- Advanced Semiconductor Detectors and Materials
- Semiconductor Quantum Structures and Devices
- Semiconductor materials and devices
- High-pressure geophysics and materials
- Nanoparticles: synthesis and applications
- Electrospun Nanofibers in Biomedical Applications
- Laser-Ablation Synthesis of Nanoparticles
- Lubricants and Their Additives
- Analytical Chemistry and Sensors
- Nonlinear Optical Materials Studies
- Bone Tissue Engineering Materials
- Plasma Applications and Diagnostics
- Advanced Surface Polishing Techniques
- Electrohydrodynamics and Fluid Dynamics
- Ion-surface interactions and analysis
- Graphene research and applications
- Luminescence and Fluorescent Materials
- Nanowire Synthesis and Applications
- Electron and X-Ray Spectroscopy Techniques
Czech Academy of Sciences, Institute of Physics
2008-2019
Czech Academy of Sciences
2005-2019
O2 Czech Republic (Czechia)
2012
Czech Academy of Sciences, Institute of Photonics and Electronics
2005-2007
Czech Technical University in Prague
2006
High-pressure high-temperature (HPHT) nanodiamonds originate from grinding of diamond microcrystals obtained by HPHT synthesis. Here we report on a simple two-step approach to obtain as small 1.1 nm excellent purity and crystallinity, which are among the smallest artificially prepared ever shown characterized. Moreover provide experimental evidence stability down 1 nm. Controlled annealing at 450 °C in air leads efficient purification nondiamond carbon (shells dots), evidenced X-ray...
Abstract Detonation nanodiamonds (DNDs) with a typical size of 5 nm have attracted broad interest in science and technology. Further reduction DNDs would bring these nanoparticles to the molecular-size level open new prospects for research applications various fields, ranging from quantum physics biomedicine. Here we show controllable DND mean down 1.4 without significant particle loss additional disintegration core agglutinates by air annealing, leading significantly narrowed distribution...
The surfaces of electrospun polystyrene (PS) nanofiber materials with encapsulated 1% w/w 5,10,15,20-tetraphenylporphyrin (TPP) photosensitizer were modified through sulfonation, radio frequency (RF) oxygen plasma treatment, and polydopamine coating. exhibited efficient photogeneration singlet oxygen. postprocessing modifications strongly increased the wettability pristine hydrophobic PS nanofibers without causing damage to nanofibers, leakage photosensitizer, or any substantial change in...
In this study, the influence of size and surface termination diamond nanoparticles (DNPs) on their antibacterial activity against Escherichia coli Bacillus subtilis was assessed. The average distribution DNPs were determined by dynamic light scattering X-ray diffraction techniques. chemical composition studied photoelectron spectroscopy showed that > 5 nm oxidized particles have a higher oxygen content. potential assessed viable count method. general, E. exhibited sensitivity to than B....
Various types of nanofibers are increasingly used in tissue engineering, mainly for their ability to mimic the architecture at nanoscale. We evaluated adhesion, growth, viability, and differentiation human osteoblast-like MG 63 cells on polylactide (PLA) prepared by needle-less electrospinning loaded with 5 or 15 wt % hydroxyapatite (HA) nanoparticles. On day 7 after seeding, cell number was highest samples HA. This result confirmed XTT test, especially dynamic cultivation, when...
Abstract In this study, we investigated the potential antibacterial properties of nanocrystalline diamond. particular, tested effect diamond nanoparticles (DNPs) on growth model gram‐negative bacterium Escherichia coli solid, nutrient‐rich medium. We found that presence DNPs agar plates significantly reduced colony forming ability E. . The occurred in a concentration dependent manner and was conditional specific ratio to number bacterial cells.
Carbon nanomaterials such as nanodiamond (ND) and graphene oxide (GO) attract increasing attention for biomedical applications due their unique adjustable properties. Here we report on antibacterial activity of NDs GO evaluated by bacterial colony counting. ND were used in oxidized (O‐ND, GO) or reduced (H‐ND, rGO) forms. are mixed Mueller–Hinton (MH) broth with Escherichia coli at the concentration 1 mg ml −1 . The resulting suspensions cultivated 5 24 h 37 °C a shaker. After each period,...
Nanocrystalline diamond (NCD) films may be used in biosensing after modification of their surfaces with active functional groups. Here, surface functionalization O- and H-NCD amine groups was made by 2 plasma-based processes: a) RF plasma treatment ammonia, b) the deposition thin amine-containing polymer via magnetron sputtering nylon target Ar/N2 mixture. Amination NCD NH3 caused an attachment 1% primary amines but destroyed conductivity films. The 5% concentration NH2 detected on covered...
Due to an extraordinary combination of intrinsic properties diamond nanoparticles (DNPs), there is increased demand for their usage in various areas. While a broad range surface termination often done by wet-chemical, UV-irradiation or plasma treatments, DNPs hydrogenation still open issue. Thermal annealing microwave treatment, both known as high-temperature processes, do not offer satisfactory solutions hydrogenation. Here, we report on new approach plasma-assisted at temperatures below...
Due to extraordinary properties and biocompatibility, diamond nanoparticles – nanodiamonds (NDs) are considered for various biomedical applications. Amongst other functional groups which may be grafted on the NDs surface, amines (NH x ) highly demanded linkers biomolecules dyes. In this regard, a non‐destructive, non‐hazardous low‐cost method of amination would further accelerate their industrial applications in biomedicine life science. Here we present study treatment using diffuse coplanar...
Nanocrystalline diamond microscopic structures (5 m width) are grown directly on Si/SiO2 substrates by patterning of a nucleation layer using photolithography prior to the growth. The in thickness 300 nm is microwave chemical vapor deposition patterns. Morphology and material composition microstructures characterized scanning electron microscopy atomic force microscopy. exhibit clear transistor characteristics both solid-state solution-gated field-effect configurations. conductivity...
Abstract Spin coating of PVA polymer with fine grained diamond powder is used as the nucleation treatment for achieving growth nanocrystalline (NCD) thin films. The realized by standard microwave plasma chemical vapor deposition (CVD). morphology and character deposited NCD film strongly related to temperature. low temperature process (430°C) results in a well‐faceted continuous high (830 °C) voids openings layer. Addition interlayer between substrate seeding composite leads more openings....
Abstract The surface conductivity of nanocrystalline diamond (NCD) films as a function deposition temperature and chemical post‐processing was characterized by current–voltage measurements using co‐planar Au electrodes. Raman spectroscopy applied to investigate the bulk quality NCD characterize relative amount sp 3 phase in volume. material properties morphology were studied atomic force microscopy (AFM) tapping detection regimes. results indicate that as‐grown boiling acid re‐hydrogenation...
We report on the fabrication and practical use of high-quality optical elements based Au mirrors coated with diamond layers flat, nanocolumnar, nanoporous morphologies. Diamond (100 nm thickness) are grown at low temperatures (about 300 °C) from a methane, carbon dioxide, hydrogen gas mixture by pulsed microwave plasma system linear antennas. Using grazing angle reflectance (GAR) Fourier transform infrared spectroscopy p-polarized light, we compare IR spectra fetal bovine serum proteins...