4-(Dimethylamino)pyridine as a powerful auxiliary reagent in the electroless synthesis of gold nanotubes.
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 × 10(-2) s(-1). Despite a high flow rate, the reaction showed 99% conversion after a distance of just 60 μm.
Technische Universität Darmstadt, Department of Materials and Geoscience, Petersenstrasse 23, 64287 Darmstadt, Germany. muench@ca.tu-darmstadt.de
Falk
F
Muench
Ulrike
U
Kunz
Cornelia
C
Neetzel
Stefan
S
Lauterbach
Hans-Joachim
HJ
Kleebe
Wolfgang
W
Ensinger
D015761:4-Aminopyridine / Q000031:analogs & derivatives* / Q000737:chemistry; D001894:Borohydrides / Q000737:chemistry; D006046:Gold / Q000737:chemistry*; D007202:Indicators and Reagents / Q000737:chemistry; D043942:Nanotubes / Q000737:chemistry*; D009596:Nitrophenols / Q000737:chemistry; D013499:Surface Properties
D001894:Borohydrides; D007202:Indicators and Reagents; D009596:Nitrophenols; D006046:Gold; C025364:sodium borohydride; D015761:4-Aminopyridine; C003885:4-dimethylaminopyridine; C024836:4-nitrophenol