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. Author manuscript; available in PMC: 2017 Mar 3.
Published in final edited form as: J Phys Chem C Nanomater Interfaces. 2016 Feb 19;120(8):4546–4555. doi: 10.1021/acs.jpcc.6b00185

Figure 1.

Figure 1

TEM image of freshly prepared triangular gold nanoprisms (50 ± 10 nm edge length, 5.5 ± 0.5 nm thick) (scale bar = 40 nm). B) TEM image of freshly prepared DNA mediated gold nanoprism assembly before separation (scale bar = 200 nm). It clearly shows that most triangular gold nanoprisms are in assembly structure via face-to-face linking between the 2D nanoprisms. Inserted diagram shows how triangular gold nanoprisms are in assembly structure via face-to-face connection via DNA. C) TEM image of freshly prepared DNA mediated gold nanoprism assembly after separation via centrifuging at 1500 rpm for 20 minutes followed by thorough washing to remove unreacted triangular gold nanoprisms (scale bar = 100 nm). D) Extinction spectra of monomer and DNA-mediated triangular gold nanoprisms. For triangular gold nanoprisms monomer, an in-plane dipole band with λmax ≈ 1300 nm and a quadrupole band with λmax ≈ 800 nm were observed. For triangular gold nanoprisms assembly, the dipole band became very broad and red shifted. The quadrupole band also became broad and slightly red shifted for assembly structure.