科研之友
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摘要
In nanotechnology, the novel creation of nanostructures consistently feeds back into efforts to fabricate novel complex hybrid nanomaterials. Two-dimensional graphene oxide dispersed liquid crystalline materials (GDLC) module assembled with CdS nanowires(NW's) have received widespread unprecedented attention due to their exceptional mechanical, electrical, thermal properties. However, making macroscopic graphene oxide (GO) sheets with average diameter 2.1 mu m, CdS nanowires (15-20 nm) requires novel technology to fabricate few layered graphene oxide (FGO)-sheets were uniformly distributed as macroscopically ordered structures. Aqueous GDLC-CdS nanowires are continuously twist to obtain macroscopic GO-sheets. Subsequently chemical reduction gave first macroscopic neat graphene sheets with high conductivity and good mechanical performance. Liquid crystal formation is the most viable approach to produce macroscopic, periodic self-assembled materials from oriented graphene sheets. We discovered well-soluble FLG-sheets can exhibit nematic liquid crystallinity into Dimethyl sulfoxide (DMSO), first established isotropic-nematic solid phase diagram demonstrated by optical microscopy textural evidences of switching and relevant spectroscopic characterizations. GO utilizes light absorption and nanoscale heat source to thermally induced phase transition with LC from homogeneous alignment to isotropic phase. Thus, volume contraction occurred over the surface area of the GDLC-nanowires hybrid complex module due to photothermal effect. Thus, an excellent conductor as well as high contrast electro-optic switchable cell also deserves most promising applications. These novel findings shed focus on microscopically assembled graphene-LC based semiconductor nanomaterial's textural phase behavior, which can only be realized as the field moves forward and makes more significant advances.
- 出版日期2016-12
- 单位武汉大学
