Direct synthesis of nanocrystalline silver from the reaction between silver carboxylates and n-trioctylphosphine.
Neat n-Trioctylphosphine (TOP) has been used for the first ever time for reduction of silver nitrate and silver carboxylates (citrate, oleate, and myristate) under mild thermal reaction conditions. UV-visible absorption measurements of re-dispersible silver particles that were obtained by reduction of silver myristrate (product-IV) and silver nitrate (product-I) showed surface plasmon resonance absorption peak at 400 nm. The powder XRD pattern of fcc zero-valent silver resulted in diameters in the range of about 25-30 nm. TEM analysis showed particle diameter similar to that was observed by the XRD. FTIR spectroscopy revealed that the organics from the carboxylate group are retained by the nano-particles in case of product-IV however, presence of TOP is observed in product-I. It is found that when silver nitrate is reduced by TOP, spherical silver nano-particles with poor redispersity are formed but extended heating results in formation of long silver rods of micrometer size however, the re-dispersible nano-particles are easily formed when silver carboxylates are reduced by TOP.
Charan
Shobhit
S
Nanomaterials Laboratory, Centre for Materials for Electronics Technology, Panchawati, Pune, India.
Singh
Narendra
N
Khanna
P K
PK
Patil
K R
KR
D002264:Carboxylic Acids / Q000737:chemistry*; D003460:Crystallization / Q000379:methods*; D008422:Materials Testing; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods; D009943:Organophosphorus Compounds / Q000737:chemistry; D010316:Particle Size; D012834:Silver / Q000737:chemistry*; D013499:Surface Properties
D002264:Carboxylic Acids; D009943:Organophosphorus Compounds; D012834:Silver; C044965:trioctyl phosphine oxide