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Warianty tytułu
Synthesis and physicochemical properties of carbon-silver core-shell structures
Języki publikacji
Abstrakty
Kuliste cząstki węglowe wykorzystywano jako rdzenie w procesie osadzania nanocząstek srebra prowadzącym do otrzymywania struktur węglowo-srebrowych typu core-shell. Kule węglowe o średnicy ok. 450÷550 nm otrzymano zmodyfikowaną metodą Stöbera z wykorzystaniem żywicy fenolowej, którą w końcowym etapie syntezy poddano procesowi karbonizacji w temperaturze 600°C w ciągu 4 h w obojętnej atmosferze. Aby umożliwić zajście procesu osadzania srebra powierzchnie kul węglowych poddano najpierw utlenianiu za pomocą kwasu azotowego, a następnie przyłączaniu grup aminopropylowych z zastosowaniem 3-aminopropylotrimetoksysilanu. Proces osadzania srebra na modyfikowanych kulach węglowych prowadzono dwuetapowo - w pierwszym etapie kationy srebra redukowano w obecności wody amoniakalnej za pomocą kationów Sn2+ zaadsorbowanych na powierzchni kul węglowych, natomiast w drugim srebro osadzano w wyniku redukcji kationów srebra za pomocą formaldehydu. Proces ten doprowadził do gęstego pokrycia powierzchni kul węglowych nanocząstkami srebra o niezbyt regularnych wymiarach (od ok. 50 nm do ok. 100 nm). Na podstawie zdjęć skaningowej mikroskopii elektronowej wykazano, że stopień pokrycia powierzchni kul węglowych srebrem zależał od stosunku masy użytego węgla do masy azotanu srebra. Wykazano, że struktury węglowo-srebrowe charakteryzowały się znaczną absorpcją promieniowania UV-Vis (320÷800 nm).
Carbon spheres were used as cores for the deposition of silver nanoparticles leading to the formation of carbon-silver core-shell structures. These spheres, with diameters ranging from 450 to 550 nm, were prepared by the modified Stöber method from phenolic resins, which at the final stage of the process were carbonized at 600 °C in an inert atmosphere for 4 hours. In order to facilitate the deposition of silver nanoparticles, the carbon spheres were made subject to oxidation with nitric acid, followed by modification with 3-aminopropyltrimethoxysilane, to attach aminopropyl groups. The deposition of silver nanoparticles onto the modified carbon spheres was a two-stage process. At the first stage silver cations were reduced by Sn2+ cations adsorbed on the modified carbon spheres, in the presence of ammonia water. At the second stage silver nanoparticles were deposited by reducing silver cations with formaldehyde. This deposition led to full coverage of the carbon spheres by non-uniform silver nanoparticles (50-100 nm). Scanning electron microscopy has revealed that the extent of coverage depends on the ratio of the mass of silver nitrate to the mass of carbon used. The resulting carbon-silver core-shell structures show a significant absorption of UV-Vis radiation (320 to 80 nm).
Czasopismo
Rocznik
Tom
Strony
3--8
Opis fizyczny
Bibliogr. 28 poz., rys., wykr.
Twórcy
autor
autor
autor
- Wojskowa Akademia Techniczna, Wydział Nowych Technologii i Chemii, ul. Kaliskiego 2, 00-908 Warszawa, jchoma@wat.edu.pl
Bibliografia
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Typ dokumentu
Bibliografia
Identyfikator YADDA
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