Study On Nano-Ag Particles Synthesized Through PAMAM Bonded On Organic Film Surfaces After Grafted Amino Groups By Plasma Treatment

In this paper the DBD plasma sources was employed to graft amine groups on the plastic film surface using different monomers. Then with the grafted amine as core the polyamido amino (PAMAM) was synthesized on surfaces of plastic films. With PAMAM Ag nanoparticles (NPs) via chemical reduction of silver nitrate (AgNO3) were synthesized.The conclusions of this work are as follows:(1) Amine functional group on plastic surface can be grafted in dielectric barrier discharge (DBD) plasma, under different monomers (ammonia, ethylene diamine and allylamine). The functional group density, which is emphasized in this work, was estimated using fluorescent label techniques and the derivatization by 4-trifluoromethylbenzaldehyde (TFBA) based on measurements of UV-visible spectroscopy and X-ray photonic spectroscopy calibrating and comparing the amine density on samples. It can be concluded that when with the ammonia as the monomer, the optimal parameters were as following:exposure time of 40s, discharge spacing of 2mm, the monomer flow at 400ml/min. The amino density was about 4.91 NH2/nm2 under this paramete. When the monomer was acrylamide, the optimal parameters were:exposure time of 6min. At this point the amino density was about 11.55 NH2/nm2; when using ethylene diamine as monomer, the amino density was about 0.98 NH2/nm2. The measurement of water contact angle confirms the grafting effect by the more hydrophilic behavior of the treated surface.(2) Polyamido amino (PAMAM) dendrimer was synthesized on the plastic surfaces through repetitive Michael addition and amidation reactions. The conditions of the reaction were studied by changing the molar concentration ratio of Ag+ and the generation of PAMAM, temperature, time and other conditions, and the optimal reaction conditions were explored.(3) The Ag NPs were fabricated by reduction of AgNO3 with NaBH4 in the presence of polyamido amine (PAMAM) dendrimer synthesized on the amine grafted plastic films. The effect of various reaction parameters, such as the concentration of Ag+ and the generation of PAMAM was explored. The Ag NPs were characterized by UV-visible spectroscopy and the scanning transmission electron microscope/the energy permits elemental analysis. The size of particles was obtained from the high resolution transmission electron microscope, which is in the average range of 2.9±0.7-4.0±1.0nm.(4) The antibacterial behavior of nano-Ag was investigated by the bacteriostasis circle measurement as the application of this macromolecule and Ag NPs. It is found that the higher generation of PAMAM, the better antibacterial activities of the nano-Ag attached film. The concentration of the silver nitrate in the solution was in proportion to the antibacterial efficiency.