A5066879877- Diamond and Carbon-based Materials Research
- Force Microscopy Techniques and Applications
- Metal and Thin Film Mechanics
- Thin-Film Transistor Technologies
- Silicon Nanostructures and Photoluminescence
- Analytical Chemistry and Sensors
- Carbon Nanotubes in Composites
- Semiconductor materials and devices
- High-pressure geophysics and materials
- Conducting polymers and applications
- Molecular Junctions and Nanostructures
- Electronic and Structural Properties of Oxides
- Nanowire Synthesis and Applications
- Silicon and Solar Cell Technologies
- Advanced Surface Polishing Techniques
- Graphene research and applications
- ZnO doping and properties
- Advanced Fiber Laser Technologies
- Polymer Surface Interaction Studies
- Organic Electronics and Photovoltaics
- Gas Sensing Nanomaterials and Sensors
- Nanoparticles: synthesis and applications
- Mechanical and Optical Resonators
- Laser-Ablation Synthesis of Nanoparticles
- Quantum Dots Synthesis And Properties
Czech Technical University in Prague
2016-2025
Czech Academy of Sciences
2010-2020
Czech Academy of Sciences, Institute of Physics
2011-2020
Faculty (United Kingdom)
2018-2020
O2 Czech Republic (Czechia)
2012
National Institute of Advanced Industrial Science and Technology
2004-2008
École Polytechnique Fédérale de Lausanne
2003-2005
Schott (Germany)
1998-2004
Technical University of Munich
1999-2004
Charles University
1997
A summary of photo- and electrochemical surface modifications applied on single-crystalline chemical vapor deposition (CVD) diamond films is given. The covalently bonded formation amine- phenyl-linker molecule layers are characterized using X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), cyclic voltammetry field-effect transistor characterization experiments. Amine- phenyl-layers very different with respect to formation, growth, thickness arrangement. We detect a...
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...
Aberration-corrected transmission electron microscopy of the atomic structure diamond–graphite interface after Ni-induced catalytic transformation reveals graphitic planes bound covalently to diamond in upright orientation. The covalent attachment, together with a significant volume expansion graphite transformed from diamond, gives rise uniaxial stress that is released through plastic deformation. We propose comprehensive model explaining Ni-mediated and bonding at as well mechanism...
Prostate cancer (PCa) is the second most common cancer. In this paper, isolation and properties of exosomes as potential novel liquid biopsy markers for early PCa diagnosis are investigated using two prostate human cell lines, i.e., benign (control) line RWPE1 carcinoma 22Rv1. Exosomes produced by both lines characterised various methods including nanoparticle-tracking analysis, dynamic light scattering, scanning electron microscopy atomic force microscopy. addition, surface plasmon...
Atomic force microscopy and Kelvin probe experiments are applied to characterize hydrogen terminated patterns contacted with gold aluminum on (100) diamond surfaces. On the work function of 4.9 eV is detected, an accuracy about 0.1 eV. Taking into account negative electron affinity −1.3 a band gap 5.5 Fermi energy 0.7 deep in valence band. Illumination sample results shift surface level by as much 0.2 This attributed photovoltage effect.
Abstract Nanocrystalline diamond thin films are grown on silicon and glass substrates by microwave plasma (MP)CVD from a gas mixture of methane hydrogen at low substrate temperatures. The initial stages growth, i.e., i) the growth individual nanometer‐sized crystals clusters, ii) coalescence into continuous layer, investigated diverse analytic techniques. Atomic force microscopy (AFM) measurements reveal nearly unchanging surface roughness up to 40 min. X‐ray photoelectron spectroscopy (XPS)...
Microscopic chemical patterning of diamond surfaces by hydrogen and oxygen surface atoms is used for self-assembly human osteoblastic cells into micro-arrays. The cell adhesion assembly further controlled concentration (2,500-10,000 cells/cm(2)) fetal bovine serum (0-15%). are characterized fluorescence microscopy actin fibers nuclei. protein adsorption studied atomic force (AFM). arranged selectively on O-terminated patterns 30-200 μm wide arrays. Higher concentrations allow colonization...
Intrinsic nanocrystalline diamond (NCD) films have been proven to be promising substrates for the adhesion, growth and osteogenic differentiation of bone-derived cells. To understand role various degrees doping (semiconducting metallic-like), NCD were deposited on silicon by a microwave plasma-enhanced CVD process their boron was achieved adding trimethylboron CH4:H2 gas mixture, B∶C ratio 133, 1000 6700 ppm. The room temperature electrical resistivity decreased from >10 MΩ (undoped films)...
Color centers in diamonds have shown excellent potential for applications quantum information processing, photonics, and biology. Here we report chemical vapor deposition (CVD) growth of nanocrystalline diamond (NCD) films as thin 5–6 nm with photoluminescence (PL) from silicon-vacancy (SiV) at 739 nm. Instead conventional 4–6 detonation nanodiamonds (DNDs), prepared employed hydrogenated 2 DNDs (zeta = +36 mV) to form extremely dense (∼1.3 × 1013 cm–2), (2 ± 1 nm), smooth (RMS roughness <...
Understanding materials with dimensions down to a few nanometers is of major importance for fundamental science as well prospective applications. Structural transformation and phonon-confinement effects in the nanodiamonds (NDs) have been theoretically predicted below 3 nm size. Here, we investigate effect size on surface chemistry, microscopic structure, Raman scattering high-pressure high-temperature (HPHT) detonation (DNDs) 2–3 nm. The NDs are controlled by annealing air...
Hydrogenated nanodiamonds (NDs) get increasing attention as promising nanomaterial in biology well optoelectronics. This study shows how the ND synthesis process and size are reflected their different colloidal/hydration electronic properties. We employ three types: detonation (DND), top-down high-pressure high-temperature (TD_HPHT ND) prepared by milling of HPHT monocrystals, bottom-up (BU_HPHT from chloroadamantane. Zeta potential measurements Fourier transform infrared spectroscopy...
Abstract A comprehensive summary of surface electronic properties undoped hydrogen terminated diamond covered with adsorbates or in electrolyte solutions is given. The formation a conductive layer at the characterized using Hall effect, conductivity, contact potential difference (CPM), scanning electron microscopy (SEM), and cyclic voltammetry experiments. Data are from measurements on homoepitaxially grown CVD films atomically smooth surfaces. data show that due to transfer valence band...
We report on systematic study of photoluminescence properties nanocrystalline titanium dioxide films consisting predominantly anatase nanoparticles with diameters larger than 13 nm. measured under two selected excitation wavelengths (325 nm/442 nm, i.e., above/below band gap excitation), different values ambient air pressure (5–105 Pa), and in the temperature interval 10–300 K. On basis our results, we are able to distinguish processes leading photoluminescence: exciton recombination...
In this article, we report on the low-level detection of hydrogen peroxide, a key player in redox signaling pathway and toxic product cellular system, using colorimetric solution assay. Amine-terminated undoped nanocrystalline diamond thin films were grown glass linear-antenna microwave plasma CVD process. The surface consists mainly -NH(2) termination. aminated was decorated with horseradish peroxidase (HRP) enzyme carbodiimide coupling chemistry. success HRP immobilization confirmed by...
Nanodiamonds (NDs) and graphene oxide (GO) are modern carbon-based nanomaterials with promising features for the inhibition of microorganism growth ability. Here we compare effects nanodiamond in both annealed (oxidized) reduced (hydrogenated) forms two types cultivation media—Luria-Bertani (LB) Mueller-Hinton (MH) broths. The comparison shows that number colony forming unit (CFU) Escherichia coli is significantly lowered (45%) by all LB medium at least 24 h against control. On contrary, a...
Nanomaterials for antimicrobial applications have gained interest in recent years due to the increasing bacteria resistance conventional antibiotics. Wound sterilization, water treatment and surface decontamination all avail from multifunctional materials that also possess excellent antibacterial properties, eg zinc oxide (ZnO). Here, we assess compare effects of synthesized hedgehog-like ZnO structures commercial particles with without mixing on inactivation surfaces liquid environments.