Preparation of Optically Active Ag Nanoparticles by UV Light Irradiation

作者：Wang Jing^*; Yi Te; Luo Qin; Liu Ya-Jun

来源：Chinese Journal of Inorganic Chemistry, 2014, 30(8): 1889-1894.

• nanoparticles
• photochemical reduction
• chirality
• surface plasmon resonance

Spherical Ag nanoparticles with a diameter about 30 nm were prepared by the reduction of AgNO3 under ultraviolet irradiation in the presence of sodium deoxycholate (NaDC) as a reducing agent and stabilizer at room temperature. The prepared NaDC-coated Ag nanoparticles were characterized by UV-Vis, TEM, FTIR and Circular Dichroism Spectrometer (CD). The results of IR spectra show that 12 alpha-hydroxyl groups of steroid ring of NaDC are oxidized and simultaneously silver ions are reduced to elemental silvers which aggregate into silver nanoparticles. The pH value of the solution has an important influence on the rate of photochemical oxidation-reduction reaction. Increasing the pH value of the solution can accelerate the reduction rate of silver ion remarkably. The prepared Ag nanoparticles show chiral signal induced by the chiral environment of NaDC adsorbed on the surface of the particles in the region of surface plasmon resonance.

• 出版日期2014-8-10
• 单位江苏科技大学