pH controlled synthesis of end to end linked Au nanorod dimer in an aqueous solution for plasmon enhanced spectroscopic applications

The pH sensitivity of DTT is used to prepare the Au NR dimer with a gap distance of ≤1 nm. FDTD simulations show an intense electromagnetic hotspot in the gap of the NR dimer, 11 fold higher than the NR monomer and 80 fold higher than without NRs.