171 research outputs found
Computational and experimental investigations on a tuneable spatial heterodyne spectrometer
Spatial heterodyne spectrometers (SHS) are interference based instruments for obtaining spectroscopic information in the UV and visible ranges. In this current study we are representing our experimental and computational findings about a tuneable SHS instrument
Examination of nanocrystalline TiC/amorphous C deposited thin films
The relationship between structural, chemical and mechanical properties of nanocrystalline
TiC / amorphous C thin films was studied. Thin films were deposited by DC magnetron sputtering on
oxidized silicon substrates in argon at 25 C° and 0.25 Pa. The input power of the carbon target was 150
W, the input power of the titanium target was varied between 15 and 50 W.
It was found that all thin films consist of a few nanosized columnar TiC crystallites embedded in carbon
matrix. The average size of TiC crystallites and the thickness of the carbon matrix have been found to
correlate with Ti content. The mechanical properties of the films have been strictly dependent on their
structure. The highest values of the nanohardness (~ 66 GPa) and Young's modulus (~ 401 GPa) were
observed for the film with the highest TiC content which was prepared at 50 W of Ti target
Hierarchically Combined Periodic SERS Active 3D Micro- and Nanostructures for High Sensitive Molecular Analysis
To increase the local field intensity of Raman scattering, gold nanospheres were entrapped in gold coated periodic inverse pyramid structures, being SERS substrates by themselves. The applicability of this complex structure for sensitive molecule detection was proved by comparison of the detected Raman signals with and without particle entrapment. Moreover its relevance in molecular diagnostic was also proposed considering the specific surface functionalisation of the gold nanoparticles
Optical properties of nano- and ultrananocrystalline diamond thin layers in the UV and visible spectral range
SzĂ©n alapĂş nano-kompozitok előállĂtása Ă©s komplex szerkezeti jellemzĂ©se = Preparation and complex characterisation of carbon based nano-composites
A gyorsulĂł műszaki-technolĂłgiai fejlĹ‘dĂ©s növekvĹ‘ igĂ©nyeket támaszt az Ăşj, kĂĽlönleges tulajdonságĂş anyagok iránt. Ezek között kitĂĽntetett helyet foglalnak el a szĂ©nalapĂş rendszerek, Ă©s kĂĽlönösen azok vĂ©konyrĂ©tegei. A szĂ©n kĂ©miai kötĂ©sviszonyaitĂłl fĂĽggĹ‘en igen változatos szerkezetű, mely a gyĂ©mánt, Ă©s gyĂ©mántszerű (DLC), grafit Ă©s fullerĂ©n-szerű mĂłdosulatokig terjedhet, melyek kialakulása befolyásolhatĂł az előállĂtás körĂĽlmĂ©nyeivel Ă©s adalĂ©kanyagokkal. Az elvĂ©gzett kutatások eredmĂ©nykĂ©nt megvalĂłsĂtottuk a szĂ©n-alapĂş nanokompozitok vĂ©konyrĂ©tegeinek plazmás-ionsugaras aktiváciĂłval, magnetronos porlasztással Ă©s plazmaimmerziĂłs ionimplantáciĂłval valĂł előállĂtását. Feltártuk a rĂ©tegnövesztĂ©s egyes paramĂ©tereinek hatását a rĂ©tegek összetĂ©telĂ©re, kĂ©miai kötĂ©s- Ă©s elektronszerkezetĂ©re. Modellrendszereken kimutattuk, hogy a DLC rĂ©tegek kĂĽlönbözĹ‘ kĂ©miai kötĂ©sszerkezetű nanomĂ©teres klaszterekbĹ‘l Ă©pĂĽlnek fel Ă©s Ăgy szerkezeti nanokompozitoknak tekinthetĹ‘k. A kĂĽlönbözĹ‘ prekurzorokbĂłl előállĂtott Si adalĂ©kot tartalmazĂł DLC rĂ©tegek amorf szerkezetűek. A szilĂcium befolyásolja a szĂ©nklaszterek kötĂ©sszerkezetĂ©t, a Si eloszlása atomi szinten nem egyenletes, ugyanakkor nem kĂ©pez többatomos elemi Si-Si Ă©s Si-C klasztereket. A rĂ©tegek alkalmazási szempontbĂłl elĹ‘nyös nanomechanikai tulajdonságokkal rendelkeznek. Az átmeneti fĂ©m (W, Cr, Ni) tartalmĂş szĂ©nrĂ©tegek közĂĽl a Si tartalmĂşak 1-5 nm-es klasszterekbĹ‘l állĂł amorf, mĂg a csak Ni tartalmĂşak rĂ©szben kristályos szerkezetűek. | Novel materials with exceptional properties are required by the accelerating technical development. In this project carbon based systems, especially their thin layers, have outstanding importance. The chemical bonding structure of the carbon may have a great variety, ranging from the diamond and diamond like systems to the graphitic and fullerene like systems, development of which can be influenced by the preparation conditions and additives. The preparation facilities and conditions for deposition of carbon based thin layers were developed by plasma and ion beam activation, by magnetron sputtering, and also by plasma immersion ion implantation. It was established that the DLC layers are built of nanometre size clusters of different chemical bonding environments. The Si containing DLC layers prepared from various precursors are amorphous. The Si additive influences the chemical bond structure of the carbon clusters; the distribution of Si is not homogeneous, however, it does not form multi-atomic Si-Si or SiC clusters. The layers posses beneficial nanomechanical properties. The carbon layers doped with transition metals (W, Cr, Ni) are also amorphous with 1-5 nm sized clusters, while the Ni containing layers are partially crystalline
MTA SZTAKI SSS Multiplatform Technology 2.0 Előadások, konferencia anyagok archiválása, videók és prezentációk szerkesztése, szinkronizált lejátszása
Az MTA SZTAKI eLearning Osztály által kidolgozott SSS többplatformĂş technolĂłgia segĂtsĂ©gĂ©vel elĹ‘adásokat Ă©s konferencia anyagokat archiválhatunk a hozzájuk tartozĂł illusztráciĂłkkal (pl. elĹ‘adás diákkal, animáciĂłkkal, videĂłkkal) egyĂĽtt. Az archivált elĹ‘adást a felhasználĂłk kĂ©sĹ‘bb bármikor megtekinthetik akár több platformon is (web Ă©s mobil), miközben az elĹ‘adáshoz tartozĂł multimĂ©dia anyagok az elĹ‘adás menetĂ©hez igazĂtottan ĂĽtemezve jelennek meg. Az MTA SZTAKI SSS rendszere alkalmas eLearning szabványnak megfelelĹ‘ multimĂ©diacsomagok lĂ©trehozására Ă©s lejátszására. A legĂşjabb fejlesztĂ©seink eredmĂ©nyekĂ©nt az SSS lejátszĂłt a SCORM szabvány felhasználásával alkalmassá tettĂĽk kĂ©tirányĂş kommunikáciĂłra forráskĂłdĂş eLearning keretrendszerekkel (pl.: Ilias, Moodle). Emiatt a rendszer kĂĽlönösen elĹ‘nyös lehet olyan oktatási intĂ©zmĂ©nyek számára, akik a meglevĹ‘ elektronikus oktatási keretrendszerĂĽkbe szeretnĂ©k beilleszteni a tantermi elĹ‘adások rögzĂtett videĂłit. Az elĹ‘adásunkban az SSS technolĂłgiát meghatározott szempontok szerint összehasonlĂtjuk nĂ©hány lĂ©tezĹ‘ hazai Ă©s kĂĽlföldi, ill. akadĂ©miai Ă©s kereskedelmi termĂ©kkel, hogy áttekintĂ©st adjunk a már lĂ©tezĹ‘ termĂ©kekrĹ‘l, Ă©s megkönnyĂtsĂĽk a köztĂĽk valĂł eligazodást
Raman and infrared spectroscopy of feldspars in lunar meteorites (Asuka-881757 and Yamato- 86032)
We investigated shock metamorphism of two lunar meteorites (Asuka-881757 and Yamato-86032). We measured shocked lunar feldspars with infrared and Micro-Raman spectroscopy. These
methods are very sensitive for changing crystal lattice after amorphisation derived to shock metamorphism. With infrared spectroscopy were four different stage schocked feldspar measured, and with Micro-Raman spectroscopy 3 maskelynite grains were measured
Investigation of PDMS-gold nanoparticle composite films for plasmonic sensors
Poly(dimethylsiloxane) (PDMS)–gold nanoparticle composite films were synthetized in situ by using a simple method based on the reduction of chloroauric acid (HAuCl4) by the PDMS membrane. The technological parameters which affect the gold nanoparticle formation on the membrane (namely the concentration of the HAuCl4 solution, the ratio of curing agent, the incubation time and the temperature) were investigated, the resulting nanoparticle films were characterized with optical spectrophotometry. The possibility to utilize the nanocomposite membranes as sensing elements in plasmonics sensors (based on localised surface plasmon resonance – LSPR) and as surface enhanced Raman spectroscopy (SERS) substrates is discussed in detail
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