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Photo/electro-responding functional polymers
Nešpůrek, Stanislav
2004 - English
Polymeric electronic devices have aroused increasing interest because of their potential low-cost applications, easy processing, possibility of modifications of their chemical structures and good compatibility with a variety of substrates. Many electrical and optical devices based on polymers can be mentioned: fuel cells, gas sensors, field-effect transistors, optical memories, information displays, hole/burning memories, lasers, etc. Polymerní elektronické přístroje podnítily rostoucí zájem díky svým nízkonákladovým aplikacím, snadnému zpracování, možnosti modifikace chemické struktury a dobré kompatibilitě s rozličnými substráty. Lze smísit řadu optických a elektrických zařízení založených na polymerech, palivové články, detektory plynů, polem řízené transistory, optické paměti, informační displeje, lasery, atp.
Keywords:
polymers; electrical properties; molecular electronics
Available at various institutes of the ASCR
Photo/electro-responding functional polymers
Polymeric electronic devices have aroused increasing interest because of their potential low-cost applications, easy processing, possibility of modifications of their chemical structures and good ...
Active polymers for solar cells application
Pfleger, Jiří; Pavlík, Martin; Hebestreit, N.; Plieth, W.
2004 - English
Two alternative systems of polymer based solar cell structures were prepared: 1) based on the acceptor modified .pi.-conjugated polymer and 2) composed of a functional polymer - inorganic semiconductor nanocomposite, and their photoelectrical properties were tested. The simple electrodeposition method, providing a large area heterojunction distributed within a bulk of the polymer nanocomposite, was developed. Byly připraveny alternativní systémy slunečních polymerních baterií založené na 1) .pí.-konjugovaném polymeru modifikovaném navázáním akceptoru a 2) polovodivém polymeru anorganického nanokompozitu. Byly otestovány jejich fotoelektrické vlastnosti a byla vyvinuta jednoduchá metoda elektrodepozice, poskytující heteropřechod rozprostřený v objemu nanokompozitu s velkým aktivní plochou.
Keywords:
polymer solar cells; nanocomposite solar cells; conjugated polymers
Available at various institutes of the ASCR
Active polymers for solar cells application
Two alternative systems of polymer based solar cell structures were prepared: 1) based on the acceptor modified .pi.-conjugated polymer and 2) composed of a functional polymer - inorganic ...
Recycled PET/organo-clay nanocomposites
Kráčalík, Milan; Puffr, Rudolf; Pospíšil, L.; Hrnčiřík, J.; Fortelný, Ivan; Šimoník, J.
2004 - English
The processable recycled PET/organo-clay nanocomposites were prepared via melt compounding method as a new possibility of recovery of the used PET bottles. XRD and rheological measurements revealed intercalation of polymer chains into the silicate gallery and significant increase of melt strength of the material, which result in improvement of processability of regranulate. Byly připraveny nanokompozity typu recyklát PET/organo-jíl metodou míchání v tavenině zpracovatelné běžnými plastikářskými technologiemi jakožto nová možnost opětovného využití PET lahví. Výsledky rentgenové strukturní analýzy a reologických experimentů prokázaly interkalaci polymerních řetězců do mezivrstevních struktur jílu a významný nárust pevnosti taveniny materiálu s následkem zlepšení zpracovatelnosti recyklátu.
Keywords:
recycled PET; polymer nanocomposite; montmorillonite
Available at various institutes of the ASCR
Recycled PET/organo-clay nanocomposites
The processable recycled PET/organo-clay nanocomposites were prepared via melt compounding method as a new possibility of recovery of the used PET bottles. XRD and rheological measurements revealed ...
Probing strong optical fields in compact aggregates of silver nanoparticles by SERRS of protoporphyrin IX
Sládková, M.; Vlčková, B.; Mojzeš, P.; Šlouf, Miroslav; Naudin, C.; Le Bourdon, G.
2004 - English
TEM images and measurements of SERRS (surface-enhanced resonance Raman scattering) spectra as a function of the porphyrin concentrations in systems with unmodified and chloride-modified Ag nanoparticle and protoporphyrin IX are reported. Jsou diskutovány TEM mikrofotografie a SERS spektra (spektra povrchem zesíleného Ramanova rozptylu) stříbrných nanočástic s protoporfyrinem IX v závislosti na koncentraci porfyrinu. Studované nanočástice byly jak nemodifikované, tak modifikované chloridovými ionty.
Keywords:
Ag nanoparticle compact aggregate; adsorbed chlorides; protoporphyrin IX
Available at various institutes of the ASCR
Probing strong optical fields in compact aggregates of silver nanoparticles by SERRS of protoporphyrin IX
TEM images and measurements of SERRS (surface-enhanced resonance Raman scattering) spectra as a function of the porphyrin concentrations in systems with unmodified and chloride-modified Ag ...
Improvement of photoluminescent properties using self-organization of block copolymer
Pavlačková, Petra; Křenek, R.; Cimrová, Věra; Výprachtický, Drahomír; Stamm, M.
2004 - English
We report on enhancement of photoluminescence of conjugated homopolymers based on poly(p-phenylene) in blends with poly(styrene-block-4-vinylpyridine) copolymer (BC). Using self-organization of BC we may avoid aggregation of the homopolymers. We have got nanostructured films of the blends depending on type of the homopolymer. Enhancement of photoluminescence is also observed. Je popsáno zvýšení fotoluminescence konjugovaných homopolymerů na základě poly(p-fenylenu) ve směsích s blokovým kopolymerem styrenu s 4-vinylpyridinem. S využitím samovolné organizace kopolymeru se lze vyhnout agregaci homopolymeru. Bylo rovněž pozorováno zvýšení fotoluminescence.
Keywords:
photoluminescence; thin films; nanostructure
Available at various institutes of the ASCR
Improvement of photoluminescent properties using self-organization of block copolymer
We report on enhancement of photoluminescence of conjugated homopolymers based on poly(p-phenylene) in blends with poly(styrene-block-4-vinylpyridine) copolymer (BC). Using self-organization of BC we ...
Investigation of mechanisms of laser fragmentation of silver nanoparticles in aqueous ambient
Dammer, Ondřej; Pfleger, Jiří; Vlčková, B.; Šišková, K.; Šlouf, Miroslav
2004 - English
The paper reports on the investigation of interaction of a high energy pulsed laser irradiation with a highly polydisperse hydrosol containing Ag nanoparticles. The study is focused on the process of nanoparticles fragmentation with respect to their shapes and sizes, and to the wavelength and energy of the NdYAG laser pulses used for the fragmentation. Popis studia interakcí pulsního laserového záření o vysoké energii s vysoce polydisperzním hydrosolem obsahujícím nanočástice stříbra. Studie se zaměřuje na fragmentaci nanočástic s ohledem na jejich tvar a velikost a na vlnovou délku použitých NdYAG laserových pulsů.
Keywords:
Ag nanoparticles; Ag hydrosol; laser ablation
Available at various institutes of the ASCR
Investigation of mechanisms of laser fragmentation of silver nanoparticles in aqueous ambient
The paper reports on the investigation of interaction of a high energy pulsed laser irradiation with a highly polydisperse hydrosol containing Ag nanoparticles. The study is focused on the process of ...
Temporally fluctuating SERS signals from molecularly-bridged silver nanoparticle dimers and small aggregates
Vlčková, B.; Moskovits, M.; Šlouf, Miroslav; Šišková, K.; Hromádková, Jiřina; Naudin, C.; Le Bourdon, G.
2004 - English
The preparation, TEM imaging and the measurement of temporally fluctuating (blinking) SERS signals of Ag nanoparticle dimers and small aggregates (trimers to dexamers) bridged by 4,4´-diamino-azobenzene molecules are reported. Je popsána příprava, TEM mikroskopie a a měření časově proměnlivých (blikajících) SERS signálů příslušejících malým agregátům, zejmena dimerům, ale i trimerům az hexamerům stříbrných nanočástic; všechny agregáty byly spojeny prostřednictvím molekulární spojky 4,4´-diamino-azobenzenu.
Keywords:
Ag nanoparticle dimers; SERS signal blinking; diaminoazobenzene linker
Available at various institutes of the ASCR
Temporally fluctuating SERS signals from molecularly-bridged silver nanoparticle dimers and small aggregates
The preparation, TEM imaging and the measurement of temporally fluctuating (blinking) SERS signals of Ag nanoparticle dimers and small aggregates (trimers to dexamers) bridged by ...
Preparation of silver nanoparticles by laser ablation – Studies of efficiency of the process
Šmejkal, P.; Pfleger, Jiří; Vlčková, B.
2004 - English
Efficiency of laser ablation of Ag target with laser pulses of three different wavelengths, 1064, 532 and 355 nm, respectively, provided by the nanosecond Nd/YAG laser system was tested in a fluence range achievable for the particular wavelength. Byla studována účinnost laserové ablace Ag terčíku laserovými pulsy o třech různých vlnových délkách: 1064, 532 and 355 nm. Byla získána pomocí nanosekundového Nd/YAG laserového systému v rozsahu použitelném vzhledem k vlnové délce částic.
Keywords:
laser ablation; silver nanoparticles; silver hydrosol
Available at various institutes of the ASCR
Preparation of silver nanoparticles by laser ablation – Studies of efficiency of the process
Efficiency of laser ablation of Ag target with laser pulses of three different wavelengths, 1064, 532 and 355 nm, respectively, provided by the nanosecond Nd/YAG laser system was tested in a fluence ...
Photoelectrically active polymer nanocomposites
Pfleger, Jiří; Pavlík, Martin; Plieth, W.; Vohlídal, J.
2004 - English
We established a new electrophoretic deposition method for the fabrication of photoelectrically sensitive structures, in which the core/shell nanoparticles dispersed in an organic solvent are deposited on a semitransparent conductive substrate under an external electric field. Byla vyvinuta nová metoda pro přípravu fotoelektricky citlivých struktur na bázi elektroforetické depozice. Při použití této metody jsou nanočástice typu jádro/slupka rozptýlené v organickém rozpouštědle deponovány na polopropustný vodivý substrát působením externího elektrického pole.
Keywords:
nanocomposites; core/shell nanoparticles
Available at various institutes of the ASCR
Photoelectrically active polymer nanocomposites
We established a new electrophoretic deposition method for the fabrication of photoelectrically sensitive structures, in which the core/shell nanoparticles dispersed in an organic solvent are ...
Organic field-effect transistors
Wang, Geng; Nešpůrek, Stanislav; Zhivkov, I.; Sworakowski, J.; Yakushi, K.
2004 - English
Copper-phthalocyanine and water-soluble sodium hydroxyaluminium phthalocyaninedisulfonate based organic field-effect transistors were prepared by vacuum evaporation and spin coating. The values of charge carrier mobilities were found to be 2.2 x 10.sup.-4./sup. cm.sup.2./sup.V.sup.-1./s.sup.-1./sup., respectively, the current switching ratio as 2 x 10.sup.5./sup.. Organické transistory založené měděním ftalocyaninu a vodorozpustným hydroxyhlinitým ftalocyanin-disulfátu sodným byly připraveny vakuovým spařováním a odstředěny nanášením. Byly nalezeny hodnoty pohyblivosti nosičů nábojů 2.2 x 10 na -4 cm2 V-1s-1, resp. proudový přepínací poměr 2 x 10 na 5.
Keywords:
field-effect transistor; phthalocyanine; photoinduced field-effect
Available at various institutes of the ASCR
Organic field-effect transistors
Copper-phthalocyanine and water-soluble sodium hydroxyaluminium phthalocyaninedisulfonate based organic field-effect transistors were prepared by vacuum evaporation and spin coating. The values of ...
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