Photoreduction of silver ion in aqueous and alcoholic solutions

Abstract

Publication costs assisted by Kyoto UniversityAqueous and alcoholic solutions of silver perchlorate have been photolyzed by 253.7-nm light. The primary reaction of the photolysis is assumed to be electron transfer from solvent molecule to silver ion: (Ag+, ROH)cage + hv -* (Ag, ROH+)cage. Variations of the mean quantum yield of silver atom formation with the concentrations of silver ion, hydrogen ion, and alcohols added are systematically interpreted by the concept that reactive species are surrounded by the solvent cage. It is proposed that the number of solvent molecules composing a cage would be about 10. The quantum yield increases with reaction temperature. Apparent activation energies of the quantum yields are about 2-6 kcal/mol.

Synthetic Routes for the Preparation of Silver Nanoparticles

“…Direct photoreduction of silver perchlorate (AgClO 4 ) in aqueous and alcoholic solutions by irradiation with UV-light at 254 nm was investigated in the 70s by Hada et al [53]. The photoreduction mechanism is based on the electron-transfer from a solvent molecule to the electronically excited state of Ag + to form Ag 0 (Eqs.…”

Two-photon-induced reduction of metal ions for fabricating three-dimensional electrically conductive metallic microstructure

“…To fabricate more complicated structures with a uniform linewidth, the precise control of the laser power is essential because the materials tend to respond differently when they are heated for different exposure times; the relationship between the laser power and the linewidth produced is not necessarily linear. The quantum yield of the photoreduction of silver ions in an aqueous solution have already studied by Hada,9 and the improvement of ultrafine metal particle generation by using a photoinitiator has been investigated by Itakura. 10 These results give us the guideline to optimize the exposure procedures, and technically the laser power control techniques used in recordable optical disks, which is often called the "write strategy," can be adopted.…”

The Reactivity of Silver Atoms in Aqueous Solutions (A γ‐Radiolysis Study)

“…The direct reaction 2Cu+ -+ Cuz+ + Co(aq) leading to free copper atoms is accompanied by a positive free energy of about 2.9eV as can easily be calculated from the estimated redox potential of -2.7 V for the system Cu+/Cuo(aq) (section 11). We may thus expect that the Cu' ions have a rather long life time in our solution and ample opportunity to reduce silver ions according to Equation (9).…”