Find more information on this work:
Friday, April 06, 2012
Formation and Decomposition of CO2 Intercalated Graphene Oxide
The formation, stability, and decomposition of CO2 intercalated graphene oxide was analyzed by FTIR, TGA-MS, TGA-IR, AFM, and SEM for the first time. We found that the formation starts at 50 °C and develops up to 120 °C. The formation process can be best observed by FTIR spectroscopy, and the product is stable at ambient conditions. At higher temperatures, the decomposition of CO2 intercalated graphene oxide occurs due to the release of water, CO2, and CO that can be monitored by TGA-MS and TGA-IR analysis. AFM and SEM images can visualize the formation of blisters in GO films that become instable at 210 °C. We further prepared graphene oxide with a low water-content and found that the formation of CO2 was significantly suppressed and CO became the major species responsible for the weight loss. In addition we prepared 18OH2 treated graphene oxide to elucidate the formation process of CO2 and found C16O18O by TGA-MS analysis that proves the crucial role of water during CO2 formation. From these experiments we propose that hydrate species are key-intermediates for the formation of CO2. Hence, it seems likely that rearrangement reactions that can proceed via hydrate intermediates, known from organic chemistry, are probably responsible for the formation of carboxylic acids at the edges of graphene oxide sheets after sonication of graphite oxide. Further, our investigations prove that graphene oxide is less stable than shown by TGA measurements. This has a high impact on the electronic properties of reduced graphene oxide, especially for all those using it for electronic applications.
Siegfried Eigler, Christoph Dotzer, Andreas Hirsch, Michael Enzelberger, and Paul Müller
Department of Chemistry and Pharmacy, University Erlangen-Nürnberg and Institute of Advanced Materials and Processes (ZMP), Henkestrasse 42, 91054 Erlangen and Dr.-Mack Strasse 81, 90762 Fürth, Germany
El desarrollo de modelos para el estudio de los iones metálicos está teniendo un acelerado crecimiento en la actualidad debido a la impleme...
Entre las variedades alotrópicas del carbono, se encuentran el diamante y el grafito. Ambas estructuras son sólidas y presentan propiedade...
este es un trabajo ke hice para quimica general... algo ke todos hicimos hahaahhah y weno.... me dijeroooon, ke debia postiarloooo NO SE KE...
Hace un siglo, el químico Søren Sørensen inventó lo que se convertiría en una herramienta de diagnóstico crucial: la escala pH. Desde su...