RT conference output
T1 Crystal size and shape analysis of Pt nanoparticles in two and three dimensions
A1 Cervera Gontard, Lionel
A1 Dunin-Borkowski, Rafal E
A1 Ozkaya, Dogan
A1 Hyde, Tim
A1 Midgley, Paul A.
A1 Ash, Peter
A2 Física de la Materia Condensada
AB The majority of industrial catalysts are high-surface-area solids, onto which an active component is dispersed in the form of nanoparticles  that have sizes of between 1 and       20 nm. In an industrial environment,  the crystal size distributions of such particles are conventionally  measured by using either bright-field transmission electron microscope  (TEM) images or X-ray diffraction.  However, the analysis of particle sizes and shapes from two-dimensional bright-field TEM images is  affected by variations in image contrast between adjacent particles, by  the difficulty of distinguishing the particles from their matrix, and by overlap between particles when they are imaged in  projection. High-angle annular dark-field (HAADF) electron tomography  provides a convenient technique for overcoming many of these problems,  by allowing the three-dimensional shapes and sizes of high atomic number nanoparticles that are supported on a low atomic number support to be recorded. Here, we discuss the three-dimensional analysis of particle sizes and shapes from such tomographic data, and we assess whether such measurements provide different information from that obtained using  two-dimensional TEM images and X-ray diffraction measurements.
SN 1742-6596
YR 2006
FD 2006
LK http://hdl.handle.net/10498/35080
UL http://hdl.handle.net/10498/35080
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 10-may-2026