In situ time-resolved XAFS analysis of silver particle formation by photoreduction in polymer solutions

Photochemical synthesis of silver particles in Tween 20/water/ionic liquid microemulsions

“…An ionic solution of AgClO 4 (before reduction) has a broad peak between 0.03 and 0.25 nm (phase shift uncorrected) and this is assigned to a Ag-O bond with a bond distance of 0.232 nm by comparison to the broad peak of a pure aqueous AgClO 4 solution as shown in our previous paper [29]. A peak was observed at around 0.26 nm after a reduction time of 15 min and an increase in the reduction time caused an increase in the intensity of the peak assigned to a Ag-Ag metallic bond of 0.287 nm [29]. No significant changes were observed for all samples after irradiation of 60 min.…”

“…It should be noted that the photoreduction of Ag + ions to Ag 0 atoms proceeds easily if the ketyl radicals of benzoin are used as reducing reagents [25][26][27][28][29] 4 ] microemulsions obtained were poured into a quartz cell and irradiation by UV-light was started with continuous stirring using a magnetic stirrer.…”

“…The Ag + -containing water-in-ILs microemulsions before photoreduction were poured into a glass cell (optical path length 50 mm) sealed with polyimide film (Kapton-200H, 50 lm thickness) windows. EXAFS spectra of the samples were measured as described in our previous paper [29]. EXAFS spectra were analyzed by a computer program REX2000 ver.…”

“…2.3.2 (supplied by Rigaku Corp.) [31]. EXAFS analysis was performed according to the procedure previously reported [28,29]. The typical Fourier transformation range from the k space to the r space was 30-160 nm À1 .…”

Facile synthesis and size control of Ag nanoparticles by a photochemical reduction at room temperature

“…(1) 24) or direct chemical reduction 25) of various non-seeded Au 3+ and Ag + systems had demonstrated the autocatalytic nucleation and growth process.…”