File:Graphene Butterly.jpg
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Eesti: Nende mikroskoopiliste liblikate tiivad võivad küll tunduda väikesed, kuid see-eest suudavad nad tõsta nii Eesti, Tartu Ülikooli kui ka Füüsika Instituudi nähtavust teadusmaailmas. Nimelt sünteesiti need ülikallid "liblikad" selleks, et paremini aru saada tulevikumaterjali grafeeni omadustest. Selleks kaeti esmalt õhuke vaskfoolium keemilise aurufaasist sadestamise (CVD) meetodil osaliselt grafeeniga. Protsess lõpetati seejuures enne kui grafeeni "saared" olid jõudnud kokku kasvada. Järgmisena aga uuriti polüpürrooli elektrokeemilist sadenemist valmistatud aluspinnale. Materjaliteadlaste uuringud Tartu Ülikooli Füüsika Instituudis oleva ülikõrglahutust omava skaneeriva elektronmikroskoobiga näitasid, et polümeer oli elektrosadestusel kasvanud eelistatult just grafeeni äärtele. See aga tähendas, et vaid ühe aatomkihi paksuse materjali (grafeeni) elektrokeemilised omadused on pinnal ja defektides väga erinevad. Seda teadmist saab osavalt ära kasutada näiteks üliõhukese grafeeni / polüpürooli nanokomposiitse korrosioonivastase kaitsekatte väljatöötamiseks, millest on ka Synthetic Metals ajakirjas artikkel avaldatud. Antud kõrgtehnoloogilise katte väljatöötamise kohta saab vaadata ka materjaliteadlaste populaarteaduslikku Youtube videot
English: These microscopic butterflies are surely one of the smallest, lightest and likely most expensive ones in the world as they partially consist of the novel one atom thick material graphene. Such butterflies however are not synthesized for their beauty, but in order to get valuable information about the electrochemical properties of graphene! By using a high resolution scanning electron microscope (SEM) to study how polypyrrole had electrochemically deposited on graphene islands, it was possible to visualize how active the defects in graphene really are compared to the defect free areas. Using the gained knowledge it was possible to synthesize an ultra thin graphene-polypyrrole nanocomposite corrosion resistant coating. This study is published in Synthetic Metals and the development of the coating can also be seen in our science video in Youtube: https://www.youtube.com/watch?v=D3CVN48B_zQ |
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| Source | Own work |
| Author | Maido Merisalu |
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This image was uploaded as part of European Science Photo Competition 2015. |
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| current | 21:03, 10 November 2015 | | 1,018 × 882 (580 KB) | Maido Merisalu (talk | contribs) | User created page with UploadWizard |
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