A5031894539- Carbon Nanotubes in Composites
- Gas Sensing Nanomaterials and Sensors
- Catalytic Processes in Materials Science
- Gold and Silver Nanoparticles Synthesis and Applications
- Electrocatalysts for Energy Conversion
- Advanced Chemical Sensor Technologies
- Nanomaterials and Printing Technologies
- Graphene research and applications
- 2D Materials and Applications
- Advanced Sensor and Energy Harvesting Materials
- Analytical Chemistry and Sensors
- Copper-based nanomaterials and applications
- ZnO doping and properties
- Advanced Photocatalysis Techniques
- Mechanical and Optical Resonators
- Supercapacitor Materials and Fabrication
- MXene and MAX Phase Materials
- Plasmonic and Surface Plasmon Research
- TiO2 Photocatalysis and Solar Cells
- nanoparticles nucleation surface interactions
- Quantum Dots Synthesis And Properties
- Bacterial biofilms and quorum sensing
- Antimicrobial agents and applications
- Nanomaterials for catalytic reactions
- Fullerene Chemistry and Applications
University of Oulu
2012-2023
Silicon Austria Labs (Austria)
2019-2023
Rice University
2008-2018
VTT Technical Research Centre of Finland
2018
University of California, Los Angeles
2018
Southern Illinois University Carbondale
2018
University of Szeged
2008-2011
A galvanic replacement reaction has been successfully applied to prepare CuPd and CuPt bimetallic nanotubes. The nanotubes were characterized by transmission electron microscopy (TEM), scanning (SEM) combined with energy dispersive X-ray spectroscopy (EDS), diffraction (XRD) techniques. Ultralong, single crystalline copper nanowires (NWs) a diameter of ∼64 nm length several micrometers used as template material. By controlling the amount noble metal salt added, different compositions...
Copper nanowires (NWs) with uniform diameters and lengths ranging from several hundreds of nanometers to micrometers have been prepared high yield by a simple hydrothermal procedure. The X-ray diffraction (XRD) energy dispersive spectroscopy (EDS) analysis data indicate that the copper are free any contamination, while electron (ED) has revealed be single crystals. nanowire growth mechanism also discussed. Hexadecylamine is surface stabilizing agent in our method, glucose facilitates...
Owing to their higher intrinsic electrical conductivity and chemical stability with respect oxide counterparts, nanostructured metal sulfides are expected revive materials for resistive sensor applications. Herein, we explore the gas sensing behavior of WS2 nanowire-nanoflake hybrid demonstrate excellent sensitivity (0.043 ppm-1) as well high selectivity towards H2S relative CO, NH3, H2, NO (with corresponding sensitivities 0.002, 0.0074, 0.0002, 0.0046 ppm-1, respectively). Gas response...
We demonstrate a simple method for the synthesis of nanoporous metal (Au, Pt, and Pd) rods by galvanic exchange reaction using Ni as sacrificial template. Nickel nanorods, prepared electrodeposition inside porous alumina membrane, were converted to various metallic structures dispersing them in salt solutions respective metals that are galvanically exchanged. The catalytic activity Pt Pd nanorods hydrogenation ethylene was comparable supported nanoparticles. provide new form unsupported...
Inkjet deposition is an attractive technology to localize nanomaterials in area-selective manner on virtually any kind of surfaces. Great advantages the method are effective usage materials, low processing temperatures and few required manufacturing steps, thus enabling rapid prototyping bulk production with reasonably cost. A number different electrical devices such as light emitting diodes, transistors solar cells have already been demonstrated, reflecting versatility inkjet printing. In...
Abstract Layered transition metal chalcogenides possess properties that not only open up broad fundamental scientific enquiries but also indicate a myriad of applications can be developed by using these materials. This is true for tungsten‐based which provide an assortment structural forms with different electronic flairs as well chemical activity. Such emergence tungsten based advanced materials lead several investigators to believe tremendous opportunity lies in understanding their...
Optical and electrochemical sensors based on 4-(dioctylamino)-4′-(trifluoroacetyl)azobenzene its Nafion®–SWCNT composites show potential for practical applications in detecting various kinds of amines.
Anisotropic titanate nanostructures can be synthesized by an environmentally benign, cost efficient and scalable process, the alkaline hydrothermal recrystallization of TiO2 with yields approaching 100%. Their chemistry offers more variety than that nanoparticles promising preliminary results were already achieved on them in fields adsorption, catalysis energy storage. In this review we first discuss structure, synthesis functionalization options nanotubes nanowires, then issues related to...
Abstract The development of scalable synthesis techniques for optically transparent, electrically conductive coatings is in great demand due to the constantly increasing market price and limited resources indium tin oxide (ITO) materials currently applied most optoelectronic devices. This work pioneers transparent films (TCFs) by exploiting coffee-ring effect deposition coupled with reactive inkjet printing subsequent chemical copper plating. Here we report two different promising...
Abstract In the present work electrically conductive, flexible, lightweight carbon sponge materials derived from open-pore structure melamine foams are studied and explored. Hydrophobic hydrophilic surface properties - depending on chosen treatment conditions allow separation storage of liquid chemical compounds. Activation carbonaceous structures substantially increases specific area ~4 m 2 g −1 to ~345 , while retaining original three-dimensional, suitable for hosting, example, Ni catalyst...
Abstract In this work, WS 2 nanowire-nanoflake hybrids are synthesized by the sulfurization of hydrothermally grown WO 3 nanowires. The influence temperature on formation products is optimized to grow nanowires covered with nanoflakes. Current-voltage and resistance-temperature measurements carried out random networks nanostructures show nonlinear characteristics negative coefficient resistance indicating that semiconducting nature. Bottom gated field effect transistor structures based only...
Supercapacitors prepared from chemically modified and vacuum filtered buckypapers were studied. The aim was to evaluate how its pore structure impacts the specific capacitance, energy, power density in different electrolytes. capacitance varies a linear fashion with surface area for nanotubes by means of catalytic, low-temperature partial catalytic oxidation using cobalt oxide nanoparticles decorating nanotubes. In contrast, electrodes composed preactivated CO2 demonstrated only minor...
Further developments of antibacterial coatings based on photocatalytic nanomaterials could be a promising route towards potential environmentally friendly applications in households, public buildings and health care facilities. Hereby we describe simple chemical approach to synthesize nanomaterial-embedded using gypsum as binder. Various types TiO2 nanofiber-based materials (nitrogen-doped and/or palladium nanoparticle decorated) their composites with were characterized by means scanning...
The rapid oxide formation on pristine unprotected copper surfaces limits the direct application of Cu nanomaterials in electronics and sensor assemblies with physical contacts. However, it is not clear whether growing cuprous (Cu2O) cupric oxides (CuO) core-shell-like Cu-Cu2O/CuO nanowires would cause any compromise for non-contact optical measurements, where light absorption subsequent charge oscillation separation take place such as those surface plasmon-assisted photocatalytic processes,...
Transparent conductive films are used in a wide variety of devices. While solar cell top electrodes as well tablet and mobile phone screens require high optical transparency low sheet resistance (>80% <10 Ω/□) to maximize power efficiency; other, less demanding applications, such those capacitive touch panels antistatic coatings, which only small currents involved, can be managed with coatings moderate conductivity. In this paper, we show that area-selective argon plasma treated polyethylene...
Nowadays gas detection in the ppm and sub-ppm domain is essential terms of environmental protection as well reducing sanitary risks. However, detecting systems to perform these measurements (e.g., chromatographs) are expensive take up too much space, thus their use not likely become wide-spread. Small, cheap easily mountable sensors, such resistive sensors more applicable for this purpose. But main disadvantage lack chemical selectivity. Yet, a novel method called fluctuation-enhanced...
We prepared buckypapers with surface densities in the 1.13-5.66 mg x cm(-2) range by filtering multi-wall carbon nanotube (MWCNT) suspensions acetyl-acetone (acac) and dimethylformamide (DMF) through 0.45 microm nylon filters. Filtration curves were evaluated using Carman equation. The average resistance of filter itself was found to be Rm = 3.79 10(10) m(-1) for acac 8.49 DMF specific a cakes decreased increasing film density from 16.1 10(12) m kg(-1) (for 1.13 DMF) 4.38 5.66 DMF)....