A5016654516- Carbon Nanotubes in Composites
- Graphene research and applications
- Gas Sensing Nanomaterials and Sensors
- Conducting polymers and applications
- Analytical Chemistry and Sensors
- TiO2 Photocatalysis and Solar Cells
- Advanced Chemical Sensor Technologies
- Supercapacitor Materials and Fabrication
- Thermal properties of materials
- Quantum Dots Synthesis And Properties
- Advanced Photocatalysis Techniques
- Mechanical and Optical Resonators
- Advanced Sensor and Energy Harvesting Materials
- Metal and Thin Film Mechanics
- Semiconductor materials and devices
- Nanowire Synthesis and Applications
- 2D Materials and Applications
- Nanotechnology research and applications
- Gold and Silver Nanoparticles Synthesis and Applications
- Nanomaterials and Printing Technologies
- Copper-based nanomaterials and applications
- Thermal Radiation and Cooling Technologies
- Advanced materials and composites
- Silicon Nanostructures and Photoluminescence
- Nanopore and Nanochannel Transport Studies
VTT Technical Research Centre of Finland
2018-2019
University of Oulu
2009-2018
Rice University
2018
Southern Illinois University Carbondale
2018
University of California, Los Angeles
2018
Rensselaer Polytechnic Institute
2007-2008
KTH Royal Institute of Technology
2007
Commonwealth Scientific and Industrial Research Organisation
1998
Jet stream: Multi-walled carbon nanotubes grown by catalytic chemical vapor deposition were carboxylated in a two-step oxidation process. An aqueous dispersion of the functionalized was dispensed using an inkjet printer to obtain electrically conductive patterns on paper and plastic surfaces (see picture). Sheet resistivities for deposited about 40 kΩ/□ could be achieved multiple prints.
Efficient cooling of silicon chips using microfin structures made aligned multiwalled carbon nanotube arrays is achieved. The tiny elements mounted on the back side enable power dissipation from heated level modern electronics demands. fins are mechanically superior compared to other materials being ten times lighter, flexible, and stiff at same time. These properties accompanied with relative simplicity fabrication makes strong candidates for future on-chip thermal management applications.
We report the synthesis of N-doped TiO(2) nanofibers and high photocatalytic efficiency in generating hydrogen from ethanol-water mixtures under UV-A UV-B irradiation. Titanate synthesized by hydrothermal method are annealed air and/or ammonia to achieve anatase fibers. Depending on route, either interstitial N atoms or new N-Ti bonds appear lattice, resulting slight lattice expansion as shown XPS HR-TEM analysis, respectively. These were then used support for Pd Pt nanoparticles deposited...
Transition metal dichalcogenides (TMDs) have received immense research interest in particular for their outstanding electrochemical and optoelectrical properties. Lately, chemical gas sensor applications of TMDs been recognized as well owing to the low operating temperatures devices, which is a great advantage over conventional oxide based sensors. In this work, we elaborate on sensing properties WS2 MoS2 thin films made by simple straightforward thermal sulfurization sputter deposited...
Abstract Transparent and conductive patterns of carboxyl functionalized single‐walled carbon nanotubes (SWCNT‐COOHs) the composites those with poly(3,4‐ethylenedioxythiophene)‐poly(styrenesulfonate) (PEDOT‐PSS) were deposited on various substrates by inkjet printing. For low print repetitions, PEDOT‐PSS/SWCNT‐COOH composite show enhanced conductance as compared to corresponding PEDOT‐PSS conductors. The results suggest a decreased percolation threshold for printed since establish electrical...
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation A. E. Pap, K. Kordás, G. Tóth, J. Levoska, Uusimäki, Vähäkangas, S. Leppävuori, T. F. George; Thermal oxidation of porous silicon: Study on structure. Appl. Phys. Lett. 24 January 2005; 86 (4): 041501. https://doi.org/10.1063/1.1853519 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends...
The electrical properties of random networks single-wall carbon nanotubes (SWNTs) obtained by inkjet printing are studied. Water-based stable inks functionalized SWNTs (carboxylic acid, amide, poly(ethylene glycol), and polyaminobenzene sulfonic acid) were prepared applied to deposit microscopic patterns nanotube films on lithographically defined silicon chips with a back-side gate arrangement. Source−drain transfer characteristics gate-effect measurements confirm the important role chemical...
Electrical properties of brush contacts made bulk carbon nanotube forest are significantly better than the presently used commercial products due to unique and intimate surface interaction former on nanoscale. The image displays block used, measurement setup, resistance fluctuations for conventional setups. Detailed facts importance specialist readers published as "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They available submitted by authors....
Three-dimensional carbon nanotube scaffolds created using micromachined Si/SiO2 templates are used as nanoparticulate filters and support membranes for gas-phase heterogeneous catalysis. The filtering efficiency of better than 99% is shown the in submicrometer particles from air. In hydrogenation propene to propane reaction low activation energy Ea ∼27.8 ± 0.6 kJ·mol−1, a considerably high turnover rate ∼1.1 molecules·Pd site−1·s−1 durable activity observed with Pd decorated membranes. It...
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...
Direct growth of tungsten carbide and sulfide on vertically aligned CNTs is demonstrated for a facile construction three-dimensional electrocatalyst nanostructures.
Efficient alignment of aqueous carboxyl-functionalized multiwalled carbon nanotubes having remanent iron catalyst particles are carried out in relatively low external magnetic fields (B ≤ 1017 mT). The were grown by catalytic chemical vapor deposition and then functionalized a multistep oxidation process using nitric acid potassium permanganate. In the field-induced ordering, ferromagnetic property nanoparticles entrapped inner-tubular cavity is exploited. Considerable dichroism nanotube...
Abstract Nitric oxide (NO) gas sensing with carboxyl functionalized single‐ and multi‐walled carbon nanotubes (SWCNTs MWCNTs) is demonstrated in this work. Stable solutions of the carboxylated were made then drop‐cast on alumina substrates equipped gold electrodes also platinum heater elements. The obtained resistive nanotube sensors tested a 2‐point setup at different temperatures NO concentrations up to 100 ppm synthetic air argon buffer. When exposed NO, conductivity changed ∼40% for...
This is an in-depth study on the photocatalytic performance characterization for single filament of TiO2 nanofiber photocatalysts by novel photo-Kelvin probe force microscopy technique (photo-KPFM) and first principles calculations. Three kinds nanofibers: anatase nanofibers (anatase NFs), nitrogen doped (N-TiO2 decorated with platinum nanoparticles (N-TiO2-Pt NFs) were investigated. The N-TiO2-Pt NFs exhibit largest negative photo surface potential shift (−182 mV) as compared to (−29 mV)....
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.
Abstract On-chip energy storage and management will have transformative impacts in developing advanced electronic platforms with built-in needs for operation of integrated circuits driving a microprocessor. Though success growing stand-alone elements such as electrochemical capacitors (super pseusocapacitors) on variety substrates is promising step towards this direction. In work, on-chip demonstrated using architectures highly aligned vertical carbon nanotubes (CNTs) acting supercapacitors,...
We present the fabrication and characterization of logic elements (transistors interconnects) built using our recently developed inkjet-printer-controlled deposition single-wall carbon nanotube network films. The method requires no preselection ``metallic'' or ``semiconducting'' nanotubes. By selecting number prints on a specified region, it is possible to have low-density, nonlinear, gate-voltage controllable transistors high-density, linear, high-current-throughput metallic interconnects...