TY - JOUR
T1 - Atomic Structure of Wurtzite CdSe (Core)/CdS (Giant Shell) Nanobullets Related to Epitaxy and Growth
AU - Bladt, Eva
AU - Moes, Relinde
AU - Peters, Joep
AU - Montanarella, Federico
AU - De Mello Donega, Celso
AU - Vanmaekelbergh, Daniël
AU - Bals, Sara
PY - 2016/11/2
Y1 - 2016/11/2
N2 - Heteronanocrystals consisting of a CdSe core and a giant CdS shell have shown remarkable optical properties which are promising for applications in opto-electrical devices. Since these properties sensitively depend on the size and shape, a morphological characterization is of high interest. Here, we present a high angle annular dark field scanning transmission electron microscopy (HAADF-STEM) study of CdSe (core)/CdS (giant shell) heteronanocrystals. Electron tomography reveals that the nanocrystals have a bullet shape, either ending in a tip or a small dip, and that the CdSe core is positioned closer to the tip (or dip) than to the hexagonal base. Based on a high resolution HAADF-STEM study, we were able to determine all the surface facets. We present a heuristic model for the different growth stages of the CdS crystal around the CdSe core.
AB - Heteronanocrystals consisting of a CdSe core and a giant CdS shell have shown remarkable optical properties which are promising for applications in opto-electrical devices. Since these properties sensitively depend on the size and shape, a morphological characterization is of high interest. Here, we present a high angle annular dark field scanning transmission electron microscopy (HAADF-STEM) study of CdSe (core)/CdS (giant shell) heteronanocrystals. Electron tomography reveals that the nanocrystals have a bullet shape, either ending in a tip or a small dip, and that the CdSe core is positioned closer to the tip (or dip) than to the hexagonal base. Based on a high resolution HAADF-STEM study, we were able to determine all the surface facets. We present a heuristic model for the different growth stages of the CdS crystal around the CdSe core.
UR - http://www.scopus.com/inward/record.url?scp=84994213399&partnerID=8YFLogxK
U2 - 10.1021/jacs.6b06443
DO - 10.1021/jacs.6b06443
M3 - Article
AN - SCOPUS:84994213399
SN - 0002-7863
VL - 138
SP - 14288
EP - 14293
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
IS - 43
ER -