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

Muench, Falk and Kunz, Ulrike and Neetzel, Cornelia and Lauterbach, Stefan and Kleebe, Hans-Joachim and Ensinger, Wolfgang (2011):
4-(Dimethylamino)pyridine as a Powerful Auxiliary Reagent in the Electroless Synthesis of Gold Nanotubes.
In: Langmuir, ACS Publications, pp. 430-435, 27, (1), [Online-Edition: http://dx.doi.org/10.1021/la104015a],
[Article]

Abstract

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 10-15 nm wall thickness and 5.0 ± 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 μm. Template-supported gold nanotubes were applied in the UV-vis 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 x 10E-2 s-1. Despite a high flow rate, the reaction showed 99% conversion after a distance of just 60 µm.

Item Type: Article
Erschienen: 2011
Creators: Muench, Falk and Kunz, Ulrike and Neetzel, Cornelia and Lauterbach, Stefan and Kleebe, Hans-Joachim and Ensinger, Wolfgang
Title: 4-(Dimethylamino)pyridine as a Powerful Auxiliary Reagent in the Electroless Synthesis of Gold Nanotubes
Language: English
Abstract:

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 10-15 nm wall thickness and 5.0 ± 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 μm. Template-supported gold nanotubes were applied in the UV-vis 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 x 10E-2 s-1. Despite a high flow rate, the reaction showed 99% conversion after a distance of just 60 µm.

Journal or Publication Title: Langmuir
Volume: 27
Number: 1
Publisher: ACS Publications
Divisions: 11 Department of Materials and Earth Sciences > Earth Science > Geo-Material-Science
11 Department of Materials and Earth Sciences > Material Science > Material Analytics
11 Department of Materials and Earth Sciences > Material Science > Physical Metallurgy
11 Department of Materials and Earth Sciences > Earth Science
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 24 Jan 2011 16:21
Official URL: http://dx.doi.org/10.1021/la104015a
Funders: The supply of gold solution by Schütz Dental GmbH is gratefully acknowledged.
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