氧化铝模板辅助生长一维纳米线阵列及其电学性质研究

氧化铝模板辅助生长一维纳米线阵列及其电学性质研究
　　TCNQ(tetracyanoquinodimethane) is a kind of electron ecceptor,which can combined with various electron donors such as TTF,alkali metals,transition metals and rare earth metals,to form stable simple/complex charge-transfer complexes. Metal organic complexes(M-TCNQs) possess excellent photic/ electric/ magnetic properties.Due to the unique on-off properties,Cu-TCNQ and Ag-TCNQ are considered as ideal molectronics materials.On the other hand,the properties such as high aspect ratio,small aperture,transparency and isolation make porous anodic alumina become appropriate template for the synthesis of nanowire array.In this thesis,Special shape NdFeB magnets M-TCNQ nanowire array and copper nanowire array were synthesized in porous anodic alumina.The morphologies and structures were observed.
　　The properties of electronic bi-stable and field emission of M-TCNQ were also studied.Porous anodic alumina was prepared.Parameters in process that would affect the morphology and structure were studied.Oxalic acid was employed as electrolyte and anodic alumina template with channels whose diameters are 40-50 nm can be obtained under DC 40 V and 5℃.By modifying anodic voltage and lasting time, channel diameter and depth could be easily controlled.Ag-TCNQ and Cu-TCNQ were synthesized in different anodic alumina templates.Morphology observing shows M-TCNQ nanowires that synthesized by vacuum vapor induced reaction almost fill every channel in templates.XRD test approves that most Cu-TCNQ is in phaseⅠ.Then,proto-type based on Cu-TCNQ nanowire array was fabricated.The on-off ration of resistance reached 104 in electric test and transition is reproducible.The structure is applicable to industry,so it is promising to be served as http://www.999magnet.com information storage device.Field emission test on Cu-TCNQ nanowires without template showed a low threshold of 5.0 V/μm(when the current density reaches 10μA/cm~2).Overload voltage was also tested.The dependence of emission current density on the electric field follows Fowler-Nordheim relationship.These results indicate that Cu-TCNQ nanowires might be a promising candidate as organic cathode material in FE-based flat panel displays.Copper nanowire array was also synthesized in porous anodic alumina via AC electrodeposition.Almost every channel was filled and the diameters of copper nanowires are uniform.