Synthesis of rod-shaped gold nanorattles with improved plasmon sensitivity and catalytic activity.
We prepared rod-shaped gold nanorattles solid gold nanorods surrounded by a thin gold shell using a galvanic replacement process starting with silver-coated gold nanorods. These structures are very promising candidates for catalytic applications and optimized plasmon sensors. They combine the advantages of rods (low plasmon resonance frequency, large polarizability, small damping) with the high surface area of hollow structures. The plasmon sensitivity to changes in the dielectric environment is up to 50% higher for gold nanorattles compared to gold nanorods with the same resonance frequency and 6x higher than for plasmons in spherical gold nanoparticles. The catalytic activity measured for the reduction of p-nitrophenol is 4x larger than for bare gold nanorods.
Khalavka
Yuriy
Y
Physical Chemistry, Johannes Gutenberg University of Mainz, Jakob Welder Weg 11, Mainz 55128, Germany.
Becker
Jan
J
Sönnichsen
Carsten
C