Photoinduced Ag_n⁰ cluster deposition: Photoreduction of Ag⁺ ions on a TiO₂-coated quartz crystal microbalance monitored in real time

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• 作者：Hisao Hidaka ; Haruo Honjo ; Satoshi Horikoshi ; Nick Serpone
• 关键词：Quartz crystal microbalance ; Photoadsorption and photoreduction of silver ; Photodepositon of silver clusters ; Titanium dioxide ; Photooxidation of hole scavengers
• 刊名：Sensors and Actuators B: Chemical
• 出版年：2007
• 出版时间：21 May 2007
• 年：2007
• 卷：123
• 期：2
• 页码：822-828
• 全文大小：457 K

文摘

The extent of photoreduction of a metal ion, such as Ag⁺, occurring on the TiO₂ particle surface was monitored in real time in the presence of hole scavengers methanol and ethanol by the quartz crystal microbalance (QCM) technique. Silver cluster deposition on metal-oxide particles that accompanies electron transfer from TiO₂ to Ag⁺(ads) depends on the surface charge of the particles, which also influences the close approach of Ag⁺ ions to the particle surface. Formaldehyde and acetaldehyde produced, respectively, as intermediates during silver deposition in the presence of the alcohols contributed negligibly to the mass of silver deposited on the TiO₂ surface. The QCM technique provides a means to monitor photoadsorption.