High-Throughput Synthesis of Graphene by Intercalation−Exfoliation of Graphite Oxide and Study of Ionic Screening in Graphene Transistor

Autor:	John T. L. Thong, Kian Ping Loh, Priscilla Kailian Ang, Shuai Wang, Qiaoliang Bao
Rok vydání:	2009
Předmět:	Materials science Graphene Inorganic chemistry Graphene foam Intercalation (chemistry) General Engineering General Physics and Astronomy Graphite oxide law.invention chemistry.chemical_compound chemistry law Monolayer General Materials Science Graphite Graphene nanoribbons Graphene oxide paper
Zdroj:	ACS Nano. 3:3587-3594
ISSN:	1936-086X 1936-0851
DOI:	10.1021/nn901111s
Popis:	We report a high-throughput method of generating graphene monolayer (>90% yield) from weakly oxidized, poorly dispersed graphite oxide (GO) aggregates. These large-sized GO aggregates consist of multilayer graphite flakes which are oxidized on the outer layers, while the inner layers consist of pristine or mildly oxidized graphene sheets. Intercalation-exfoliation of these GO aggregates by tetrabutylammonium cations yields large-sized conductive graphene sheets (mean sheet area of 330 +/- 10 microm(2)) with high monolayer yield. Thin-film field-effect transistors made from these graphene sheets exhibit high mobility upon nullifying Coulomb scattering by ionic screening. Ionic screening versus chemical doping effects of different ions such as chloride and fluoride on these graphene films were investigated with a combination of in situ Raman spectroscopy and transport measurement.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d43f44a76f9afa26904708a4dd5bc5bb https://doi.org/10.1021/nn901111s Zobrazit plný text záznamu