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| Identifier |
000398920 |
| Title |
Οργανωμένες μεσοπορώδεις δομές με αυτό-συναρμολόγηση νανοσωματιδίων Cu2S και CuINS2 για φωτοκαταλυτικές εφαρμογές |
| Alternative Title |
Orderer mesoporous structured from self-assembly of Cu2S and CuIn S2 nanoparticles for photocatalytic applications |
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Author
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Καλούδη, Παντελίτσα
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Thesis advisor
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Αρματάς, Γεράσιμος
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Reviewer
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Κιοσέογλου, Γεώργιος
Βελώνια, Καλλιόπη
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| Abstract |
Semiconductor materials with large and accessible pore surface area hold promise for applications in photocatalysis, solar energy conversion and size-selective separation and chemical sensing. Compared to semiconductor nanoparticles and bulk-like structures, open-pore networks of semiconductive composition are expected to elucidate advantageous characteristics such as rapid mass transport within the pore channels and interfacial transfer of electron along the framework.
In this work, we report the synthesis of ordered mesoporous networks of interconnected Cu2S and In-loaded Cu2S nanoparticles. To produce the mesoporous Cu2S nanoparticle assemblies (MCSN), we used aggregating self-assembly of thiol-stabilized Cu2S nanoparticles, followed by oxidative polymerization with H2O2 in the presence of block copolymer template (Brij-58). The synthesis of In-doped Cu2S assembled structures (MICSN) with different composition (2–48 mol% In) was accomplished by a topotactic ion-exchange process of Cu2S mesoporous with In3+ ions. The porous structure of MCSN and MICSN materials was characterized by a combination of small-angle X-ray scattering (SAXS), X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results showed the formation of a network structure consisting of connected 6–7 nm Cu2S and CuInS2 nanocrystals. The architectural rigidity and permanent porosity of these materials was verified by N2 physisorption measurements; analysis of the N2 adsorption data reveals that template-free MCSN and MICSN samples have BET surface areas of ~16–57 m2g-1 and narrow-sized pores of 5–6 nm. The chemical composition and optical properties of these ensemble structures were characterized by elemental X-ray microanalysis (EDS) and infrared (IR) and diffuse-reflectance ultraviolet-visible (UV/vis) spectroscopy. The high surface area, rich S–S network and visible light response render these new ensemble structures suitable for photocatalytic and environmental remediation applications. Catalytic results showed that MCSN and MICSN assemblies exhibit high activity for the oxidative decomposition of organic pollutants (methylene blue) with molecular O2 and the reduction of toxic Cr(VI) in water.
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| Language |
Greek |
| Issue date |
2015-11-20 |
| Collection
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School/Department--School of Sciences and Engineering--Department of Materials Science and Technology--Post-graduate theses
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Type of Work--Post-graduate theses
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| Views |
240 |
Οργανωμένες μεσοπορώδεις δομές με αυτό-συναρμολόγηση νανοσωματιδίων Cu2S και CuINS2 για φωτοκαταλυτικές εφαρμογές
