| As an advanced functional material in the 21 st century, silver nanomarteials were widely used as optical display materials, cryogenic superconducting materials, medical antibacterial and bacteriostatic materials, catalytic materials, biosensor materials, and metallization materials. These applications of silver nanomarterials are dependent on its special characterizations such as large surface specific area, high surface activity, low electrical resistance, good sintering performance and so on. Therefore, silver nanomaterials have great potential in the market and applications. Much attentions were attracted by numerous researchers to the synthesis methods, characteristics and applications of nano silver materials.Template method is one of the synthesis methods to prepare silver nanoparticles. Silver nanoparticles could be constrained to grow along with the template, and the morphology, size and grow direction of synthesized silver would be controlled as the design. In addition, the existence of template could effectively avoid the agglomeration of as-obtained nanomaterials.In this paper, silver nanoparticles were synthesized with CTAB(cetyltrimethyl ammonium bromide) were used as the morphology template and glucose as reducing agent. It was summarized as follows:(1) With cetyltrimethyl ammonium bromide(CTAB) as template, silver ammonia(Ag(NH3)2OH) as precursor, the influences of morphology and size of as-prepared nano silver were investigated by varying the concentration of reaction agents. The results showed that the concentration ratio of template agent to precursor was the decisive factor to control the morphology of resulted nano-silver, which could be changed from particles to wires when the ratio is 1.2 to 1. On the other hand, the proportion of particle-structured silver increased with the more addition of CTAB, and reducing agent decreasing greatly increased the average size of silver nano-particles.(2) With Ag(NH3)2OH as precursor and the cationic surface active agents as template with different carbonyl chain and counter ions based on CTAB, different morphologies of silver nanoparticles were obtained. It was demonstrated that constraint effects resulting from template were strengthened with the elongation of carbonyl chain. Meanwhile, crystallinity of products became higher and average size became smaller under extending carbonyl chain of as-used surfactant. A very narrow size distribution of silver nano-particles with average diameter of 56.7 nm was achieved using CTAC as template agent which containing Cl-.(3) With silver acetate as precursor and CTAB acted as template agent, the preparation of silver nanomaterial was studied. Silver reduction rates were slowed down due to the partly ionized of as-added CH3 COOAg causing low concentration of Ag+. Experimental results showed that the as-prepared silver nanowires with unity morphology, small average diameter(≈ 45nm), and narrow size distribution, were obtained when silver ammonia solution was replaced by CH3 COOAg.According to the catalyzing potential of silver nanoparticles, epoxy resin solution containing silver ions which could make non-mental substrate be activated has been prepared. The resin solution consisted of silver acetate, epoxy resin monomer, curing agent, curing accelerator, and butanone which was used to adjust viscosity of solution. After coating the prepared resin solution on clean FR-4 substrate, and cured the resin at 150℃ for 1h, cohesion strength between cured resin and substrate FR-4 was measured by tensile testing and chemical properties of cured resin were analyzed by FT-IR(Fourier Transform Infrared Spectroscopy) and TGA(Thermogravimetric Analysis). Furthermore, the properties of electro-plated copper layer under the reduction of nanosized silver were characterized by SEM(Scanning Electron Microscope), metallographic microscope images and resistivity test. |
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