|Title||Single-shot 3D coherent diffractive imaging of core-shell nanoparticles with elemental specificity|
|Publication Type||Journal Article|
|Year of Publication||2018|
|Authors||Pryor, A, Rana, A, Xu, R, Rodriguez, JA, Yang, Y, Gallagher-Jones, M, Jiang, H, Kanhaiya, K, Nathanson, M, Park, J, Kim, S, Kim, S, Nam, D, Yue, Y, Fan, J, Sun, Z, Zhang, B, Gardner, DF, Dias, CSato Baral, Joti, Y, Hatsui, T, Kameshima, T, Inubushi, Y, Tono, K, Lee, JYang, Yabashi, M, Song, C, Ishikawa, T, Kapteyn, HC, Murnane, MM, Heinz, H, Miao, J|
We report 3D coherent diffractive imaging (CDI) of Au/Pd core-shell nanoparticles with 6.1 nm spatial resolution with elemental specificity. We measured single-shot diffraction patterns of the nanoparticles using intense x-ray free electron laser pulses. By exploiting the curvature of the Ewald sphere and the symmetry of the nanoparticle, we reconstructed the 3D electron density of 34 core-shell structures from these diffraction patterns. To extract 3D structural information beyond the diffraction signal, we implemented a super-resolution technique by taking advantage of CDI’s quantitative reconstruction capabilities. We used high-resolution model fitting to determine the Au core size and the Pd shell thickness to be 65.0 ± 1.0 nm and 4.0 ± 0.5 nm, respectively. We also identified the 3D elemental distribution inside the nanoparticles with an accuracy of 3%. To further examine the model fitting procedure, we simulated noisy diffraction patterns from a Au/Pd core-shell model and a solid Au model and confirmed the validity of the method. We anticipate this super-resolution CDI method can be generally used for quantitative 3D imaging of symmetrical nanostructures with elemental specificity.