In this work the grafting of an amino functionalized polyhedral oligomeric silsesquioxanes (POSS-NH2) onto a graphene oxide (GO) layer previously immobilized onto a (3-aminopropyl)triethoxysilane modified silicon substrate is described. A layered film characterized by hydrophobic properties combined with a low friction coefficient was produced. POSS are organic–inorganic molecules, with a general formula (RSiO1,5)n where R is hydrogen or an organic group, such as alkyl, aryl or any of their derivatives1-3. The incorporation of POSS molecules into polymeric materials leads to significant improvements in polymeric mechanical properties, thermal behaviour and flame retardancy4-6. The structure of graphene oxide sheets consists of basal plane of the sheet with hydroxyl and epoxy functional groups, carbonyl groups are present as carboxylic acids along the sheet edge but also as organic carbonyl defects within the sheet.7,8. Surface modification reactions allow to obtain functionalized GO based materials; for example the chemical interaction between amino groups and functional groups of graphene oxide has been also extensively debated in the literature9,10. The approach involving a direct coupling of amino-POSS with graphene oxide sheets to introduce amino groups via amide formation could lead to a novel nanostructured hybrid material merging the properties of both components.
Self assembly of POSS / graphene oxide hybrid nanomaterials
BITTOLO BON, SILVIA;VALENTINI, LUCA;KENNY, Jose Maria
2012
Abstract
In this work the grafting of an amino functionalized polyhedral oligomeric silsesquioxanes (POSS-NH2) onto a graphene oxide (GO) layer previously immobilized onto a (3-aminopropyl)triethoxysilane modified silicon substrate is described. A layered film characterized by hydrophobic properties combined with a low friction coefficient was produced. POSS are organic–inorganic molecules, with a general formula (RSiO1,5)n where R is hydrogen or an organic group, such as alkyl, aryl or any of their derivatives1-3. The incorporation of POSS molecules into polymeric materials leads to significant improvements in polymeric mechanical properties, thermal behaviour and flame retardancy4-6. The structure of graphene oxide sheets consists of basal plane of the sheet with hydroxyl and epoxy functional groups, carbonyl groups are present as carboxylic acids along the sheet edge but also as organic carbonyl defects within the sheet.7,8. Surface modification reactions allow to obtain functionalized GO based materials; for example the chemical interaction between amino groups and functional groups of graphene oxide has been also extensively debated in the literature9,10. The approach involving a direct coupling of amino-POSS with graphene oxide sheets to introduce amino groups via amide formation could lead to a novel nanostructured hybrid material merging the properties of both components.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
