کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7853203 1508870 2014 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effects of processing and material parameters on synthesis of monolayer ultralarge graphene oxide sheets
ترجمه فارسی عنوان
اثرات پردازش و پارامترهای ماده بر سنتز صفحات اکسید گرافن فوق سنگین تک لایه
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی (عمومی)
چکیده انگلیسی
Chemically-derived ultralarge graphene oxide (UL-GO) sheets are synthesized from natural graphite (NG) flakes based on the modified Hummers method. Three different approaches are adopted and the effects of ultrasonication, thermal shock expansion, degree of oxidation and precursor NG flake size are specifically studied on the quality and size of GO sheets produced. Results show that the use of large-size NG flakes as precursors does not necessarily produce large GO sheets. Optimal processing conditions are identified to be thermal shock exfoliation with the addition of moderate oxidation, i.e. with an expanded graphite to KMnO4 weight ratio = 1:7 for 24 h, and avoiding ultrasonication during the oxidation process. The resulting UL-GO sheets have a maximum area over 10,000 μm2 with a mean area 3400 μm2 at a yield of 39.8% for GO sheets larger than 2500 μm2, which are considered quite sufficient as precursors for many multifunctional applications, including transparent conductive films, optoelectronic devices and aligned graphene composites.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Carbon - Volume 77, October 2014, Pages 244-254
نویسندگان
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