We report the synthesis of solution-suspendable hollow gold nanotubes and study their plasmonic properties as both an aligned array and in solution. In solution, we observe the transverse and longitudinal modes expected for anisitropic gold nanostructures, as well as a quadrupole resonance. Gold nanotubes exhibit refractive index sensitivities of 1568 nm/RIU.
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Bridges et al. (2012) studied this question.