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. 2016 Apr 4;2(4):219–224. doi: 10.1021/acscentsci.6b00023

Figure 1.

Figure 1

Ionic-strength-dependent assembly behavior of DNA coated AuNPs. 1D SAXS intensity profiles for ss-DNA-AuNP and ds-DNA-AuNP in NaCl (A, C) and CaCl2 (B, D) solutions. The data shown is the scattered intensity above the background scattering from empty capillary and pure water. The insets in panels A and C show the DNA-grafted-AuNP components. There are ∼60 thiolated-DNA tethered to each AuNP. About 40% of the strands on ds-DNA-AuNPs were in duplexed form. The ss-DNA is a T40 strand. The DNA chain in panel C consists of a 10 base long ss-DNA spacer A10 and an 18 base-pair long ds-DNA segment. Therefore, the total charge on the nanoparticles is ∼2400 e–/NP and ∼2100 e–/NP for ss-DNA-AuNP and ds-DNA-AuNP, respectively. Solid red lines are the expected scattered intensities from isolated DNA-grafted-AuNPs.