Preparation And Application Of Polymer-Assisted Multiplex Metal Nanoparticles

With the rapid development of nanotechnology,people have paid more and more attention to the micro and nano devices,miniaturization,energy saving devices and high sensitive detectors.The precious metal nanoparticles(especially gold and silver nanoparticles)that posess excellent photoelectric properties and stability,while its unique properties in the localized surface Plasmon resonances(LSPR),has very large research prospect and application value of molecular detection(SERS)optoelectronic devices and energy catalysis.Many researchers put the different metal nanoparticles size,shape,conponents doped in devices or signal molecules of substrate and photo catalytic materials,,found that the property of the device has been improved obviously.However,we also found that the fabrication process of the device is complex and the yield is low,the repeatability is poor and the application is narrow.At the same time,many structures show dependence on the multi-component and multi-size nanoparticles.Therefore,building a multiplex surface plasma structure on the surface of same substrate(with multiple components and size,shape and different particle spacing),it is particularly important to realize the new photoelectric device and Raman efficiency and performance improvement.Based on the results of previous studies,the following three aspects are studied in this paper,which are the self-assembly technique,the surfece plasmon structure and the photoelectric effect:(1)Firstly,we synthesized 13nm gold nanoparticles with good dispersion(AuNPs),and gold nanoparticles assembled on the surface of the modified amino group.Then substrate spin-coated organic polymer layer,the gold nanoparticles with the well arrangement as seeds,to realize the controllable growth of surface nanoparticles on the substrate surface.The polymer layer presents a chain like structure,due to its hydrophilic state in the molecular chain at room temperature,the chain structure in aqueous solution is a loose state,such growth liquid can be evenly spread to the surface of the seed,not only can prevent the particles out of order uneven growth,but also can effectively prevent the loss of nanoparticles after growth the precise control of the growth of nanoparticles.With the aid of the dip-coating technique,the controllable grov,wth of the nanoparticles can be achieved,and the distribution of nanoparticles with different sizes on the same substrate surface is obtained.Rhodamine 6G(R6G)can be seen as a signal molecule,which can be found that the Raman signal has a gradient distribution,so the multi response Raman substrate can be used for the development of new high sensitive devices.(2)Based on the above mentioned,we have applied this system to the semiconductor photocatalysis system to construct a new framework of metal structure and semiconductor.The diversification of distributed gold nanoparticles were assembled on the ITO surface,the in-situ growth time can be realized in different distribution surfaces of different sizes,and then coated with a layer of TiO2 as a photocatalytic layer,can be found in the photocurrent is enhanced.However,we found that the enhancement effect did not meet expectations.It is expected that the substrate can achieve a wider absorption in the visible range,Therefore,by the growth of silver nanoparticles in situ,Construction of multi-component distributed metal nano plasma structure,we can find that the photocurrent enhancement can reach 15 times.It is shown by theoretical simulation and experimental UV spectra that the multiplex-component metal nanoparticles can broaden the visible light response and improve the photocatalytic performance.(3)We introduce a diversified plasma structures into the optoelectronic devices to improve the luminous efficiency of the traditional red materials(phenanthroline ruthenium).The metal nanoparticles is introduced between luminescent material and luminescent electrode,improve the carrier injection on the electrode surface,enhance the luminous efficiency and brightness,the luminance enhancement reached about 6 times,effectively reducing the energy cornsumption of the traditional luminescent materials.The particle distribution in different regions of the electrode surface can be realized by in situ growth,which can realize the distr:ibution of different brightness on the same surface of the device,in order to realize the high efficiency and new type of optoelectronic devices.