Controllable Assembly Of Metal Colloidal Nanoparticle On Substrate

The functional assembled system of metal colloidal nanoparticles on substrate have got widely application in optoelectronic devices,energy catalysis,biosensing,and information storage owing to the physicochemical performance of themselves,especially the synergistic performances of metal colloidal nanoparticles and specific optoelectronic properties in assembled system.The functionality of self-assembled system of metal colloidal nanoparticles on substrate will be regulated by adjusting the inter-particle spacing,composition,morphology,size,precise positioning on substrate,and etc.of metal colloidal nanoparticles on substrate in assembled system.It is critical to develop reliable approaches to realize controlled assembly and precise positioning of metal colloidal nanoparticles.Here,taking metal colloidal nanoparticles as an example,the new strategy of controllable assembly and precise positioning of metal colloidal nanoparticles on substrate was propose base on the interrelationship of the nanoparticle ionic strength,electrostatic potential,and inter-particle spacing,meanwhile,controllable paparation and functional regulation of assembled system have been achieved,and then,the application of assembled system in optoelectronic devices has been explored.The research contents list as follows:1.By adjusting the ionic strength of the solution and the electrostatic potential of the substrate,two-dimensional controllable assembly of the metal colloidal nanoparticles on the surface with positively charged substrate is achieved.Combining with the theoretical derivation,a correction formula for the inter-metallic spacing between the colloidal nanoparticles on the substrate was proposed to reveal the assembly mechanism and which provided the basis and theoretical basis for the controlled assembly and performance research of colloidal nanoparticles on the substrate.2.Positively charged metal colloidal nanoparticles have been successfully assembled on the negatively charged substrate.Furthermore,assembling nanoparticle with different polarity on the same substrate were achieved by selectively charge inversion to modify substrate,and it offers a new method to construct nanostructures with multiplexed metal colloidal nanoparticles in different charges on the same substrate.3.The assembled system with different morphology,size and charge were constructed by templates induced modulation.These results are opening intriguing scenarios toward exciting perspectives in the design and development of new plasmon-related devices.4.We successfully synthetized Au nanobipyramids and constructed a novel architecture by controllably assembling them on silver film.The corresponding structures exhibit considerable local electromagnetic field enhancement and show great potential application for the design of sensors with high sensitivity and novel optoelectronic devices.