Periodic lattices of arbitrary nano-objects: modeling and applications for self-assembled systems

Yager, K.G.; Zhang, Y.; Lu, F.; Gang, O.

doi:10.1107/S160057671302832X

Figure 3
Example of a high-quality fit to experimental data. The black dots are experimental SAXS data obtained for a binary lattice of nanoparticles, wherein 7.8 $[\pm]$ 0.9 nm diameter CdTe quantum dots are combined with 9.1 $[\pm]$ 0.2 nm diameter Au nanoparticles. The two particle types each have attached DNA chains that are complementary to a linker strand, which is subsequently introduced to induce particle aggregation into a superlattice. Nanoparticles are coated with a 7 base-pair (b.p.) flexible segment followed by a 15 b.p. complementary region. The linker has a 30 b.p. double-stranded region, between complementary ends, to regulate interparticle distance. The solid blue line is a fit to the data, using the formalism described in the main text [equations (34)

–(37)

] and allowing interparticle distance and disorder parameters to vary (the best fit has a = 39.0 nm, $[\sigma_{\rm D} = 0.07]$ and $[\delta = 0.01]$ nm⁻¹, which implies a grain size $[\xi \simeq 15 a]$ ). The top panel shows the residual signal used in fitting. The inset shows the assembled structure: a simple cubic unit cell, with particle positions following a body-centered cubic arrangement where each quantum dot (purple) connects to eight Au nanoparticle neighbors (gold).

JOURNAL OF
APPLIED
CRYSTALLOGRAPHY

ISSN: 1600-5767

Volume 47| Part 1| February 2014| Pages 118-129

doi:10.1107/S160057671302832X

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