Robert Peter

Robert Peter
University of Rijeka · Department of Physics

PhD

About

53
Publications
4,454
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600
Citations

Publications

Publications (53)
Article
Full-text available
Salt-affected and sandy pedospheres low in complex organic and mineral matrices critical for metal sorption (e.g. humics, aluminosilicates) could exacerbate metal transfer into the food chain. To test this hypothesis, a 3-factor study with salinity (0-50 mM NaCl), humates (HA; 0-150 mg/kg) and Cd contamination (0-9 mg/kg) was conducted in sandy sub...
Article
Cellulose fibers coated with a double-layer ZnO/Al2O3 thin film (cel/Al2O3/ZnO)were prepared in-situ by two successive processes of atomic layer deposition (ALD). Photoinactivation kinetics of Gram-negative (Escherichia coli) and Gram-positive (Staphylococcus aureus) bacteria were investigated in the dark and under UVA irradiation. Compared to the...
Article
Microstructure and morphology of particles play key roles in optimizing the properties of shape-selected ZnO particles, which are essential factors for flexible and reliable applications. In particular, chemical understanding and physical measurement with scientific theory must be further integrated for the realization of finely tuned ZnO nano/micr...
Article
We report on multi-step copper-free vapor phase azide-alkyne click reactions for the functionalization of metal oxide nanopowders, automated with the atomic layer deposition (ALD) technique. The synthetic approach consists of the following reaction steps: chemisorption of propiolic acid (PA) to ZrO2 from the gas phase, followed by the formation of...
Article
In this work, we present a large, tenfold enhancement in the photocatalytic activity of thin ZnO films grown by plasma-enhanced atomic layer deposition (PE-ALD) at 100 °C, compared to values obtained for thin ZnO films deposited by a conventional thermal ALD method at the same temperature. Thus, we have demonstrated that we can deposit thin ZnO fil...
Article
One of negative side-effects of usage of bio-renewables might be generation of mineral (ash) material, potential source of environmental pollution. A hypothesis was that bottom ash (BA; from biomass cogeneration facility) could be efficiently (re) used in soil chemical conditioning similarly to widely-used dolomite-based soil conditioner (DO; from...
Article
Full-text available
Organophosphorus compounds, like bisphosphonates, drugs for treatment and prevention of bone diseases, have been successfully applied in recent years as bioactive and osseoinductive coatings on dental implants. An integrated experimental-theoretical approach was utilized in this study to clarify the mechanism of bisphosphonate-based coating formati...
Article
We have studied the effect of grain size on the photocatalytic activity of TiO2 thin films grown by atomic layer deposition technique. A number of thin films of different crystallinity (anatase, rutile, amorphous) and grain sizes (55 nm to 715 nm) were grown on Si substrates under different processing conditions, by varying the reactor temperature,...
Article
The photocatalytic activity of ZnO films, grown by atomic layer deposition on sapphire, was investigated for different amounts of residual hydrogen, incorporated unintentionally into the matrix during the crystal growth. A close correlation was found between the level of incorporated hydrogen and the rate of photocatalytic degradation of methylene...
Article
This study describes a straightforward preparation of organic-inorganic thin films containing a stable "sandwich"-like structure of two atomic layer deposited (ALD) ZnO layers separated by a thin organosilane phase, which is built from a single organic component (3-mercaptopropyl)trimethoxysilane (MPTMS). Grafting of MPTMS on the first ALD ZnO laye...
Article
The present work shows a surface-induced preparation of sub-100 nm organosilica nanohemispheres on atomic layer deposited (ALD) Al2O3 thin films, which was achieved by cooperative condensation/hydrolysis and thiol-ene click chemical reactions. The two-step synthetic approach consists of an initial silanization of the Al2O3 film with vinyltrimethoxy...
Article
Full-text available
A structured transdisciplinary method for the experimental determination of friction in the nanometric domain is proposed in this paper. The dependence of nanoscale friction on multiple process parameters on these scales, which comprise normal forces, sliding velocities, and temperature, was studied via the lateral force microscopy approach. The pr...
Article
We report for the first time on a pulsed vapor phase copper-free azide-alkyne click reaction on ZnO by using the atomic layer deposition (ALD) process technology. The reproducible and fast...
Article
We have studied the initial stages of oxide formation on CoCrMo surfaces, exposed to oxygen environment or bombarded by low-energy oxygen ions at room temperature (RT), using x-ray photoemission spectroscopy (XPS) around Co 2p, Cr 2p and Mo 3d core-levels. The results are compared with the oxidation of pure Co, Cr and Mo metals from the literature....
Presentation
Controlling the photocatalytic activity of TiO2 thin films grown by atomic layer deposition Titanium dioxide (TiO2) represents a perfect example of a multifunctional metal-oxide semiconductor with applications ranging from microelectronics to photo catalysis or medical device materials [1]. Atomic layer deposition (ALD) is widely regarded as one o...
Conference Paper
Full-text available
The main limitation in modelling nanoscale friction is the variety of physicochemical processes and their interactions in nanoscale contacts that depend on the materials and on the conditions relating to sliding velocity, normal forces, temperature etc. To assess the value of the nanoscale friction coefficients, in this work an experimental methodo...
Presentation
The cobalt-chromium (CoCr) based alloys belong to one of the most important class of metallic biomaterials, primarily due to the exceptional strength and corrosion protection, slow wear rate and good biocompatibility. We have employed x-ray photoemission spectroscopy (XPS) in order to examine the RT oxidation behaviour of CoCrMo alloy, either expos...
Poster
Full-text available
This research was motivated by the development of new methods for the antibacterial coatings on polymers. These methods should make the process of nanoparticle synthesis and impregnation more affordable and ecological. They were tested on two different polymers (PVC and PET) with two kinds on nanoparticles (Au and Ag).
Article
We have studied the oxidation of pure molybdenum metal at room temperature (RT) by low-energy oxygen-ion bombardment within an analytical, ultrahigh vacuum chamber, using x-ray photoemission spectroscopy (XPS) around the Mo 3d core level. We provide a detailed characterization of the oxidation states of pure Mo and a comparison with the Mo oxidatio...
Article
We have studied the initial stages of oxide formation on molybdenum surfaces under 1 keV O2⁺ ion bombardment at room temperature (RT), using x-ray photoelectron spectroscopy around Mo 3d or O 1s core-levels and the valence band photoemission. The results are compared with the oxidation mechanism of thermally oxidized Mo at RT. The thermal oxidation...
Article
We have studied the formation of oxides on pure chromium metal surfaces by 1 keV O2⁺ ion bombardment at room temperature (RT), using X-ray photoemission spectroscopy around Cr 2p or O 1s core-levels and the valence band photoemission. For comparison, we have also examined the oxidation mechanism of thermally oxidized Cr surfaces at RT. The results...
Article
Full-text available
Alumosilicate materials zeolites are widely exploited due to porous structure and ion-exchange properties in several industrial, agriculture and veterinary applications. The only zeolite used for medical purposes in animals and humans so far is the natural zeolite clinoptilolite. Clinoptilolite may be prepared for medical applications by different...
Article
The crystal structure and the grain size of thin TiO2 films grown by atomic layer deposition (ALD) was characterized by scanning electron microscopy, grazing incidence X-ray diffraction, secondary ion mass spectrometry, X-ray photoelectron spectroscopy, atomic force microscopy, and near-edge X-ray absorption fine structure spectroscopy. The films o...
Article
We have studied the presence of residual chlorine in thin TiO2 films grown by plasma enhanced atomic layer deposition (PEALD) at temperatures within 40–250 °C range, using x-ray photoemission spectroscopy, secondary ion mass spectrometry, grazing incidence x-ray diffraction and scanning electron microscopy. The source of the residual chlorine is Ti...
Article
We have studied the oxidation of pure molybdenum metal at room temperature (RT) by low-energy oxygen-ion bombardment, within an analytical ultrahigh vacuum chamber, using x-ray photoemission spectroscopy (XPS). In this paper, we provide a detailed characterization of pure Mo metal oxidation states and we compared it with the Mo oxidation in CoCrMo...
Article
The formation of oxide films on pure Ni surfaces by low energy oxygen ion-beam bombardment at room temperature was studied by X-ray photoelectron spectroscopy. Ion-induced oxidation is more efficient in creating thin NiO films on Ni surfaces than oxidation in oxygen atmosphere. The oxide thickness of bombarded samples is related to the penetration...
Poster
Full-text available
Introduction In this work, we provide a detailed characterization of room temperature oxidation of Mo from pure Mo metal and CoCrMo alloy by low-energy oxygen ion bombardment using x-ray photoelectron spectroscopy (XPS) and make a comparison with thermal oxidation. Experimental All oxidation was done in situ in the main chamber of the XPS instrumen...
Poster
Nitinol (NiTi), a nearly equiatomic alloy of Ni and Ti atoms, with its unique features such as shape memory, superelasticity and kink resistance, has found many applications in biomedical device production. However, the release of Ni from nitinol is of considerable concern, as Ni atoms are known to be allergenic and toxic. Therefore, modification a...
Article
Most experiments on thermal oxidation of cobalt have shown the parabolic growth rate consistent with the diffusion of cations through neutral cation vacancies. Here, we present experimental results on the oxidation of Co metal by low-energy oxygen bombardment at room temperature, which scales with the dose of implanted oxygen, Φ, as Φ1/6. This type...
Poster
Titanium dioxide (TiO2) is a widely used material for photocatalytic, optical, electrical and medical applications. Atomic layer deposition (ALD) represents an excellent technique for the synthesis of thin films due to its precise thickness control, simplicity, high conformity of obtained films and reproducible growth of defect-free films.
Poster
Full-text available
We have grown TiO2 films using the heated source in Beneq TFS 200 ALD system for tetrakis(dimethylamino)titanium (TDMAT) as a Ti precursor. The films were synthesized on silicon substrates at temperatures from 100 oC – 250 oC using both thermal and plasma enhanced ALD (PEALD), with a remote RF plasma reactor operated at 13.56 MHz and 150 W. For the...
Poster
Full-text available
Among metal-oxide semiconductors, titanium dioxide (TiO2) is one of the most promising materials for many applications, ranging from microelectronics to photo catalysis or medical device materials. In recent years, atomic layer deposition (ALD) technique has been extensively used for the growth of thin TiO2 films because of its excellent thickness...
Article
In this work polypyrrole was prepared using different solutions of graphene oxide as the supporting electrolyte. Two different samples of graphene oxide (GO1 and GO2) were prepared from different graphite precursors. The obtained samples were characterised by means of scanning electron microscope (SEM), atomic force microscope (AFM) and X-ray photo...
Article
We have studied formation of oxides on Ni surfaces by low energy oxygen bombardment using X-ray photoemission spectroscopy (XPS) and secondary ion mass spectrometry (SIMS). Different oxidation states of Ni ions have been identified in XPS spectra measured around Ni 2p and O 1s core-levels. We have compared our results with thermal oxidation of Ni an...
Poster
Full-text available
Depozicija atomskih slojeva (ALD) je idealna tehnika za narastanje tankih filmova na nanometarskoj skali s kontrolom debljine na razini Å. Površina supstrata izlaže se prekursorima koji se naizmjenično pulsiraju u komoru za narastanje, pri čemu kemijska reakcija molekula prekursora s podlogom dovodi do rasta filma. U ovom radu dajemo primjer narast...
Poster
Nickel oxide (NiO) is a good example of a p- type semiconducting oxide, with a wide range of possible applications, from electrochromic devices or chemical sensors to antiferromagnetic layers in spin valve structures. The quality of devices depends critically on the electrical properties of NiO films, thus it is important to fully understand the ox...
Article
In a view of the importance of the solid-state properties of the oxide/hydroxide films on the efficiency of Ni–catalysts, this work is focused on the electronic structure of the passive α–Ni(OH)2 film that behaves as an n-type semiconductor (with anion vacancies as dominant point defects). The solid-state transformation of the n-type α–Ni(OH)2 film...
Article
Alkyl chains of different length were added onto surface of multiwall carbon nanotubes (MWCNT). Oxidized multiwall carbon nanotubes (MWCNT-COOH) were reacted with thionyl chloride (SOCl2) and further in esterification reaction with given alcohols gave corresponding methyl ester (MWCNT-COOCH3), n-butyl ester (MWCNT-COOC4H9) and n-dodecyl ester (MWCN...
Article
We have studied the electronic structure of nitinol exposed to low-energy oxygen-ion bombardment, using x-ray photoemission spectroscopy (XPS) and near-edge x-ray absorption fine structure (NEXAFS) spectroscopy. XPS spectra reveal a gradual transformation of nitinol surfaces into TiO2 with increased dose of implanted oxygen. No oxidation of Ni atom...
Article
The mechanism of deterioration of the capacitive response of electrodeposited MnO2 under reducing potentials has been studied by combined electrochemical and quartz crystal microbalance, XPS and SEM techniques. Cycling of the electrode towards cathodic potentials of −0.3 V vs. Ag/AgCl leads to irreversible reduction resulting in low valence mangane...
Article
The combined electrochemical and chemical methods with limited cost and green technology have been introduced for production of bone-like calcium deficient hydroxyapatite (HA) coatings on the Mg-alloy and glassy carbon surfaces. The potential assisted deposition allows the formation of films of controlled composition and morphology. At the same tim...
Article
Mg and Mg-alloys are promising materials for biodegradable implants. In order to slowdown the Mg-alloy (AZ91D) degradation and enhance its biocompatibility, the alloy surface was modified with alkylphosphonate self-assembling films. The binding configuration and the structural organization of alkylphosphonate monolayers on the Mg-alloy surface were...
Article
Full-text available
The authors have applied high-resolution near-edge x-ray absorption fine structure measurements around the nitrogen K-edge to study the effects of ion-bombardment on near-surface properties of boron nitride nanotubes. A notable difference has been observed between surface sensitive partial electron yield (PEY) and bulk sensitive total electron yiel...
Article
High-energy ball milling has been used to produce nanocrystalline and amorphous structures in nature graphite, but Raman spectroscopy analysis shows that the structure of the amorphous phase produced by ball milling is less disordered than the amorphous structures in ion-beam bombarded graphite and sputtered amorphous carbon. The band intensity rat...
Article
Full-text available
In the K-shell excitation spectroscopy studies of hexagonal boron nitride, a sharp π* resonance at 192.0 eV in the B K-edge region due to the B 1s–π* transition has been widely observed and accepted for three decades. However, our high-resolution near-edge x-ray absorption fine-structure studies disclose that this characteristic exciton peak actual...
Article
The surface modification of Armco® iron for corrosion protection was performed by using the formation of the passive oxide film as well as the surface treatment by an ionic liquid. The band structure model was employed to explain the kinetics of oxide film growth and reduction in terms of point defects diffusivity. Low values of the diffusion coeff...
Article
The use of self-assembling monolayers (SAM) of long chain carboxylic acids has a potential for designing specific interface architectures in degradable implants technology. In this paper, the native and anodically formed oxide films on the Mg-alloy (AZ91D) surface were modified with the SAMs of palmitic acid (PA) and stearic acid (SA) to protect th...
Article
We have studied the formation of nitrogen-related point defects in gallium nitride (GaN) using near-edge x-ray absorption fine-structure (NEXAFS) spectroscopy and ab initio FEFF calculations. The presence of several point defects, created within the GaN matrix by low-energy ion-bombardment, has been detected by NEXAFS measurements around N K-edge....
Article
Full-text available
Decoration of nitrogen vacancies by oxygen atoms has been studied by near-edge X-ray absorption fine structure (NEXAFS) around B K-edge in several boron nitride (BN) structures, including bamboo-like and multi-walled BN nanotubes. Breaking of B-N bonds and formation of nitrogen vacancies under low-energy ion bombardment reduces oxidation resistance...
Article
Formation of defects in hexagonal boron nitride (h-BN) under low-energy argon or nitrogen ion bombardment has been studied by near-edge X-ray absorption fine structure (NEXAFS) around boron and nitrogen K-edges and X-ray photoemission spectroscopy (XPS) from B1s and N1s core levels. Breaking of B–N bonds and formation of nitrogen vacancies have bee...
Article
Full-text available
Formation of defects in hexagonal and cubic boron nitride ( h -BN and c -BN, respectively) under low-energy argon or nitrogen ion-bombardment has been studied by near-edge x-ray absorption fine structure (NEXAFS) around boron and nitrogen K -edges. Breaking of B–N bonds for both argon and nitrogen bombardment and formation of nitrogen vacancies, V<...

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