Ag nanoparticles were produced by the reduction of AgNO_3 with the protecting of sodium oleate using NaBH_4. After adding the transferring regent NaH_2PO_4, a film of Ag nanoparticles was formed at the interface of water/organic phase. The film could be transferred to a substrate such as glass. The mechanism of the transfer of the film was discussed. Quartz Crystal Microbalance (QCM) was also used to measure the transferred colloidal quantity for Ag nanoparticles.

Key words: SILVER, NANOPHASE MATERIALS, COLLOID, PHASE TRANSFER REACTION