Synthesis of Rod-Shaped Gold Nanorattles with Improved Plasmon Sensitivity and Catalytic Activity
journal contributionposted on 2009-02-11, 00:00 authored by Yuriy Khalavka, Jan Becker, Carsten Sönnichsen
We prepared rod-shaped gold nanorattlessolid gold nanorods surrounded by a thin gold shellusing 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 6× higher than for plasmons in spherical gold nanoparticles. The catalytic activity measured for the reduction of p-nitrophenol is 4× larger than for bare gold nanorods.