Abstract
In this paper, aspect ratio-dependent localized surface plasmon resonance (LSPR) scattering of gold nanorods was investigated through dark-field microscopic imaging (iDFM) at single nanoparticles level. Seed- mediated growth method was used to make gold nanorods with different aspect ratios. By combining iDFM with scanning electron microscope (SEM), we found that single gold nanorods (AuNRs) scattered red light, and the scattering spectra of single AuNRs shifted towards to longer wavelength as the aspect ratio increased. In addition, the refractive index (RI) sensitivities of single AuNRs with different aspect ratios were proven to be different, and the RI sensitivities got higher with increasing aspect ratio. These results are of implication for further designing highly sensitive nanobiosensors and improving the detection sensitivity.
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