Preparation Of Silver Conductive Film Using Low-temperature Annealing

In this paper, silver conductive films were prepared from silver nanoparticles and silver carboxylates at relatively low annealing temperature. The preparations of silver nanoparticles and silver carboxylates were also investigated. According to experiments, the lowest annealing temperature of silver nanoparticles conductive films was 150℃, the lowest annealing temperature of silver carboxylates conductive films was 160℃, and the resistivity was less than 1×10^-6Ω·m.The influence of sizes of silver nanoparticles and silver carboxylates carbon chain length on the silver conductive films of annealing temperature was studied. Silver conductive films were prepared with the same heating rate (100℃/h) and the same holding time (200 minutes)at different annealing temperature points. Films side resistances were measured by Four-probe method. According to experiments, when the carbon chain length was from 10 to 16 with the same annealing temperature, the shorter silver carboxylates carbon chain length was, the smaller sheet resistance was. However, when the length of the carbon chain was from 12 to 18, the longer silver nanoparticles carbon chain length was, the smaller resistance of films was, even smaller than silver conductive films prepared by silver carboxylates. Surface microstructures of films were observed by field emission scanning electron microscope. The conductive films which were prepared by silver nanoparticles more dense even smaller than that prepared by silver carboxylates.The preparation of silver nanoparticles was investigated. When silver acetate, longer-chain alkylamine and phenylhydrazine reacted at 60℃, the grain size of about 15 nm silver nano-particles were preparaed. The silver nanoparticles particles were analysised by absorption spectroscopy, X-ray diffraction and transmission electron microscopy. According to experiments, when the phenylhydrazine was used as the reductant and hexadecylamine was used as dispersant, the silver nanoparticles particles were spherical, uniform without large grain and reunion phenomenon.Meanwhile preparation of the long carbon chain carboxylic acid silver was also studied. The sedimentation of silver carboxylates was prepared by silver nitrate, sodium hydroxide and carbonate at room temperature. Long carbon chain carboxylic acid silver was studied by differential thermal analysis for identifying the heat law from room temperature to 300℃. According to experiments, when the carbon chain length was from 10 to 16, the longer acid silver carbon chain length was, the higher decomposition temperature was.