4D Electron Diffraction Reveals Correlated Unidirectional Behavior in Zinc Oxide Nanowires Export

@article{Science2008DSYang, abstract = {The confined electronic structure of nanoscale materials has increasingly been shown to induce behavior quite distinct from that of bulk analogs. Direct atomic-scale visualization of nanowires of zinc oxide was achieved through their unique pancake-type diffraction by using four-dimensional (4D) ultrafast electron crystallography. After electronic excitation of this wide-gap photonic material, the wires were found to exhibit colossal expansions, two orders of magnitude higher than that expected at thermal equilibrium; the expansion is highly anisotropic, a quasi-one-dimensional behavior, and is facilitated by the induced antibonding character. By reducing the density of nanowires, the expansions reach even larger values and occur at shorter times, suggesting a decrease of the structural constraint in transient atomic motions. This unanticipated ultrafast carrier-driven expansion highlights the optoelectronic consequences of nanoscale morphologies. 10.1126/science.1162049}, author = {Yang, Ding-Shyue and Lao, Changshi and Zewail, Ahmed H.}, citeulike-article-id = {3292446}, citeulike-linkout-0 = {http://dx.doi.org/10.1126/science.1162049}, citeulike-linkout-1 = {http://www.sciencemag.org/cgi/content/abstract/321/5896/1660}, citeulike-linkout-2 = {http://view.ncbi.nlm.nih.gov/pubmed/18801993}, citeulike-linkout-3 = {http://www.hubmed.org/display.cgi?uids=18801993}, day = {19}, doi = {10.1126/science.1162049}, journal = {Science}, keywords = {electron-diffraction, nanowires}, month = {September}, number = {5896}, pages = {1660--1664}, posted-at = {2008-10-07 16:47:07}, priority = {2}, title = {4D Electron Diffraction Reveals Correlated Unidirectional Behavior in Zinc Oxide Nanowires}, url = {http://dx.doi.org/10.1126/science.1162049}, volume = {321}, year = {2008} }

TY - JOUR ID - Science2008DSYang L3 - citeulike-article-id:3292446 N2 - The confined electronic structure of nanoscale materials has increasingly been shown to induce behavior quite distinct from that of bulk analogs. Direct atomic-scale visualization of nanowires of zinc oxide was achieved through their unique pancake-type diffraction by using four-dimensional (4D) ultrafast electron crystallography. After electronic excitation of this wide-gap photonic material, the wires were found to exhibit colossal expansions, two orders of magnitude higher than that expected at thermal equilibrium; the expansion is highly anisotropic, a quasi-one-dimensional behavior, and is facilitated by the induced antibonding character. By reducing the density of nanowires, the expansions reach even larger values and occur at shorter times, suggesting a decrease of the structural constraint in transient atomic motions. This unanticipated ultrafast carrier-driven expansion highlights the optoelectronic consequences of nanoscale morphologies. 10.1126/science.1162049 IS - 5896 JF - Science EP - 1664 TI - 4D Electron Diffraction Reveals Correlated Unidirectional Behavior in Zinc Oxide Nanowires VL - 321 SP - 1660 KW - electron-diffraction KW - nanowires AU - Yang, Ding-Shyue AU - Lao, Changshi AU - Zewail, Ahmed PY - 2008/09/19/ UR - http://dx.doi.org/10.1126/science.1162049 ER -