tailieunhanh - Báo cáo hóa học: " Polycation stabilization of graphene suspensions"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Polycation stabilization of graphene suspensions | ul Hasan et al. Nanoscale Research Letters 2011 6 493 http content 6 1 493 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Polycation stabilization of graphene suspensions Kamran ul Hasan1 Mats O Sandberg2 Omer Nur1 and Magnus Willander1 Abstract Graphene is a leading contender for the next-generation electronic devices. We report a method to produce graphene membranes in the solution phase using polymeric imidazolium salts as a transferring medium. Graphene membranes were reduced from graphene oxides by hydrazine in the presence of the polyelectrolyte which is found to be a stable and homogeneous dispersion for the resulting graphene in the aqueous solution. A simple device with gold contacts on both sides was fabricated in order to observe the electronic properties. Introduction The unique physical electronic and optical properties of graphene have been reported many times 1-4 and promise a wide variety of applications. Different methods have been adopted for obtaining graphene . mechanical exfoliation of graphite 5 epitaxial growth 6 and chemical exfoliation in different solutions 3 7-9 . A very promising route for the bulk production of the graphene sheets can be chemical reduction and dispersion of graphene in aqueous solutions. Two steps are involved in making water dispersible graphene 1 first chemical oxidation of graphite to hydrophilic graphite oxide and 2 exfoliating it into graphene oxide GO sheets in aqueous solution. GO sheets are graphene sheets having oxygen functional groups. These GO sheets are prevented from agglomeration by electrostatic repulsion alone 10 . The insulating GO can easily be reduced to highly conducting graphene by hydrazine reduction. However the reduction of GO soon leads to agglomeration while a stable dispersion is key to the possibility of large-scale processing. Polymeric imidazolium salts can be a good way to form a stable dispersion of graphene. Organic salts based .

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