Exploring The Electronic And Optoelectronic Properties Of Metal-semiconductor Hybrid Materials

Metal nanomaterials have been known as very promising nanomaterials for nano surface-engineering and building multi-functional nanostructures duo to their combined advantages of unique electronic,optical and catalytical properties,which stem from their intrinsic characteristics of nanomaterials(such as small size effect,surface effect and quantum tunneling effect),and the quantum coupling effect and synergistic effect resulting from the combination of nanostructures and metal nanomaterials.To meet the growing requirements of nanotechnology,the composite nanomaterials,especially metal and semiconductor nanocomposites,have attached considerabe attention for memory device,biomedical detection,optoelectronic device and solar energy harvesting systems in view of the nanocomposites combine the functions of all components together and exhibit synergies and versatility,which enablthesis e better optical and electrical properties compared to each component.Therefore,the focuses on the designing and constructing novel gold-semiconductor nanocomposites,and exploring their electronic and optoelectronic performance.The main contents including:1.Developed a simple and low-cost method to fabricate Au/polypyrrole core-shell nanoparticles,and the aggregation problem of Au nanoparticles in device has also been addressed.Experimental results show that the core-shell nanoparticles exihibit interesting programmable negative different resistance(NDR)characteristic.Based on this NDR effect,the Au nanoparticles were employed to fabricate memory device.The application of the NRD behavior of the Au/polypyrrole core-shell nanoparticles can be precisely modulated by adjusting the shell thickness and the size of Au core.The formation mechanism has been deeply discussed.2.Proposed a new strategy to fabricate the composite conductive polymer nanowire embedded with approximative 1D plasmonic nanoparticle arrays by sequential assembly of AuNPs and polypyrrole(PPy)within the same 1D groove template with controllable interparticle distance and size.This hybrid material shows enhanced photoresponse in the visible range and spectral selectivity,which can readily allow us to construct multicolor photodetectors by 1D PPy nano wires embedded with AuNPs.And the performance can be optimized by tunning the interval and size of gold nanoparticle.The plasmon enhanced mechanism has been deeply discussed.3.Designed a plasmonic sandwich structure of TiO2/Au NP arrays with super-narow gaps/TiO2,which extend the absorption to visible even NIR.And the photocurrent density of the sandwich nanostructure is enhanced by 86 fold due to the strong electric filed intensity resulting from LSPR.4.Constructed a unique gold/silicon nanostructure through self-assembled gold nanoparticle array using RIE,which owns a big gold nanoparticle on the top Si nanowire and many small broadside gold nanoparticles.This composite nanostructure shows excellent photoelectrochemical(PEC)performance both at the acidic and neutral condition.