Chiba University. Longitudinal unzipping of Multi Wall Carbon Nanotubes Nguyen Trong Chien*, Luong Xuan Duy Department of Nano Science, Chiba University. Defect. MWNTs. Graphene Nanoribbons(GNRs). Potential applications. FET. Armchair edge GNRs. Solar cell. Flexible display.
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Chiba University Longitudinal unzipping of Multi Wall Carbon NanotubesNguyen Trong Chien*, Luong Xuan Duy Department of Nano Science, Chiba University Defect MWNTs Graphene Nanoribbons(GNRs)
Potential applications FET Armchair edge GNRs Solar cell Flexible display ZigZag edge GNRs
Purification of MWNTs • Contain graphitic, carbon amorphous particles • To suspend tubes in surfactant and remove large carbon particles • To remove medium carbon particles • To remove surfactant • To burn small carbon particles MWNTs (arc discharge) Grind in surfactant solution(SDS 1%)and filter Centrifuge Filter( pore size 0.22μm) Heat at 400℃
Purified MWNTs 20nm 15nm AFM image of MWNTs on gold surface Cross section
Oxidation reaction MWNTs was firstly stirred in concentrated sulfuric acid( ) for 1 hour, followed by potassium permanganate( ). Oxidation reaction was performed in oil bath at 80-100℃. Reaction mixture was stirred for 2 hours until KMnO4 was totally consumed.
Filtration Dilute reaction mixture with water Filtration (poze size 0.22μm) Only GNRs left on filter Rinse with water and ethanol 0.22μm filter To dissolve GNRs Stir in acetone Graphene nanoribbons (Yellow colored solution)
Absorption spectrum MWNTs GNRs GNRs Original MWNTs
Computation Manganate ion attack First attack weakens neighbor C-C bonds Unzipped tubes end up with Zigzag edge
Summary and conclusions • Oxidation shortening was observed with excessive amount of KMnO4 and time. • Obtained GNRs was in form of Graphene oxide(GO), highly soluble in acetone and water, low electrical conductivity.
Acknowledgement • Prof. Kazunuki Yamamoto for helpful advices • Prof. Nobuyuki Aoki for sample preparation assistant • Dr. Yutaka Noguchi for AFM assistant • Dr. Yasuda for centrifuge assistant