Plasmonic Antennas Based on Silica Shell-Coated Gold Nanorods for Near-IR Photodetectors

This paper presents the results on the colloidal synthesis of plasmonic antennas based on gold nanorods about 65 nm in length and 10 nm in diameter and on the growth of SiO2 shells of about a 15 nm thickness on the rods. The resulting nanorods have plasmon absorption in the range of 1–1.8 µm and, upon dispersion, form fairly stable colloidal solutions that persist for at least 10 h in various solvents, including water, ethanol, chloroform, tetrachloroethylene, and n-hexane.