4-(Dimethylamino)pyridine as a Powerful Auxiliary Reagent in the Electroless Synthesis of Gold Nanotubes

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• 作者：Falk Muench ; Ulrike Kunz ; Cornelia Neetzel ; Stefan Lauterbach ; Hans-Joachim Kleebe ; Wolfgang Ensinger
• 刊名：Langmuir
• 出版年：2011
• 出版时间：January 4, 2011
• 年：2011
• 卷：27
• 期：1
• 页码：430-435
• 全文大小：988K
• 年卷期：v.27,no.1(January 4, 2011)
• ISSN：1520-5827

文摘

Gold nanotubes of small particle sizes down to 5 nm and high aspect ratios were synthesized in ion track etched polycarbonate following a rational reaction design. 4-(Dimethylamino)pyridine (DMAP) was employed to adjust the electroless deposition by interfering with the autocatalytically active gold surface. Modification of the pH value and DMAP concentration led to a wide range of products which were characterized by SEM, TEM, and EDS. Filigree nanotubes of 10鈭?5 nm wall thickness and 5.0 卤 2.1 nm grain size were obtained as well as robust and free-standing structures proving homogeneous deposition along the whole template length of 30 渭m. Template-supported gold nanotubes were applied in the UV鈭抳is monitored reduction of 4-nitrophenol by sodium borohydride under pseudo-first-order conditions. They proved to be a reliable microfluidic system of excellent catalytic activity coming up with an apparent rate constant of 1.3 脳 10^鈭? s^鈭?. Despite a high flow rate, the reaction showed 99% conversion after a distance of just 60 渭m.