High resolution pattern of silver nanoparticles has received great attentions for its application in various electronic devices such as touch screen, OLED and solar cell. However, traditional printing techniques cannot meet the demands for high resolution. Here, we introduce a new method to prepare fine lines of nanoparticles less than 10 μm by microcontact printing (μCP), which was first used to surface modification and patterning. The PDMS stamp with 10 μm line width and space was prepared by replication of etched silicon template. Conductive silver ink was transferred from resource substrate to the target substrate using the PDMS stamp during μCP process. Transferred line patterns of silver nanoparticles were conductive and the resistance was about 100 Ω using two-point probe measure method after baking at 150°C for 30 min. We found that printing pressure imposed on the PDMS stamp was significant for the quality of lines during the μCP process and appropriate printing pressure was 7~9 KPa. The technology can be used as universal method to transfer other nanomaterials and create fine patterns with a simple and cost-effective manner.

In order to acquire conductive film with high transparency, conductive polymer PEDT: PSS was mixed with some polar dopants and some surfactants. The coating fluid was acquired and coated on the PET film with different coating rods, and conductive film was gotten after drying at some temperature. The conductive mechanism of polymer after doping was introduced. Furthermore, the influenced factors of conductivity were discussed, including different dopants and surfactants as well as dried temperature. It was concluded that DMSO and EG were the best dopants, that surfactants including fluoride or silicon were suited for high conductivity. The sheet resistance of conductive film can be less than 300 Ω/□ when dried at 130 oC, at the same time the transparency at 550 nm is more than 83%. After measuring with AFM, the surface of film was sharp and the surface roughness is 7nm.

Because of clear image, bright color, high saturation of the color printing on coated paper, the ink-jet printing on coated paper catches more and more people’s eyes. In order to solve the problem of the ink-jet ink (cyan, magenta, yellow and black) on coated paper already developed out, whose yellow ink slants red and gloomy, different dyes are used to produce ink-jet ink. The inks were printed on the R-230 ink-jet printer on matt coated paper. The chromatic aberration is obtained on the basis of the colorimetric values in the ISO 12647-2:1996 eqv GB/T 17934.2-1999. It is found that the aberration of the Y79 is lower and its saturation is higher. The ink is filtered with 0.20 μm filter membrane and it can be used on ink-jet printing. The ink was used to print on the coated paper together with the previous cyan, magenta and black ink already developed out. The colorimetric values were measured and chromatic aberration and saturation is computed. The Color gamut graph of original inks and improved inks combination are made and compared to the standard of the ISO 12647-2:1996. It is found that the problems of hue unjust and gloomy color are improved compared to the previous four colors together. The cyan and magenta still stay away from perfect and it should be improved in future.

A simple and facile preparation approach of gold-silver nanoframes is described based on triangular silver nanoplates. HAuCl4was used as etching agent and added to boiling nanoplates suspension under stirring. Especially, when different concentrations of HAuCl4was employed, various etching happened and corresponding morphology of gold-silver nanoframes were acquired. The properties of nanoframes were characterized by scanning electron microscopy (SEM) and UV-vis spectra. Then the nanoframes were self-assembled onto the silicon treated with APTMS and used as SERS substrates for detecting p-ATP molecules. The results indicated that nanoframes showed better SERS effects than nanoplates.

To achieve a satisfied conductivity of nano-size silver printed circuit, post deal with nano-size silver conductive film was investigated. Based on the preparation of nano-size conductive ink and conductive circuit, the coated conductive film was treated by series concentrations of hydrochloride solutions, and then scanned by laser beam. The influence of resolutions concentration and dipping time were investigated separately. Atomic force microscopy (AFM), fourier transform infrared (FTIR) and four-probe tester, were applied to characterize the different tested samples. It was found that when the coated silver conductive ink samples were dipped in 20% hydrochloride for 60min, 15℃ before laser scanning, the conductivity reaches 0.3Ω/ϒ. It is therefore considered that the "dip in" method provide an efficient alternative to improve the conductivity which from nano-size silver ink.