By Francis Leonard Deepak, Alvaro Mayoral, Raul Arenal
This publication highlights the present realizing of fabrics within the context of recent and always rising concepts within the box of electron microscopy. The authors current functions of electron microscopic thoughts in characterizing a number of recognized & new nanomaterials. The purposes defined contain either inorganic nanomaterials in addition to natural nanomaterials.
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Extra info for Advanced Transmission Electron Microscopy: Applications to Nanomaterials
Ruiz-Zepeda et al. patterns can be displayed as a phase or an orientation map of the scanned area . In a modern TEM with a FEG tip, a small probe of around 1–2 nm size (Fig. 17b) can be formed in NBD mode by using a small condenser aperture; this will yield a high spatial resolution of the map. If the sample is thick, however, the trade-off of selecting the smallest spot size and aperture is to preserve enough brightness in the diffraction pattern. When using precession, the effective focused beam size on the specimen will suffer from beam broadening due to spherical aberration for the nonaxial trajectories, and this will be more noticeable when increasing the precession angle .
Sci. U. S. A. 105, 9157–9162 (2008) 30. A. Dass, P. Ninmala, V. Jupally, N. Kothalawa, Au103(SR)45, Au104(SR)45, Au104(SR)46 and Au105(SR)46 nanoclusters. Nanoscale 5, 12082–12085 (2013) 31. Dass, Nano-scaling law: geometric foundation of thiolated gold nanomolecules. Nanoscale 4, 2260–2263 (2012) 32. Y. K. Chaki, Y. L. Whetten, T. Tsukuda, Origin of magic stability of thiolated gold clusters: a case study on Au25(SC6H13)18. J. Am. Chem. Soc. 129, 11322–11323 (2007) 33. C. M. Aikens, A. Dass, X-ray crystal structure and theoretical analysis of Au25– xAgx(SCH2CH2Ph)18–alloy.
15, Au clusters smaller than 2 nm could be analyzed, which suggests an electron probe size smaller than 2 nm, with convergence angles smaller than 1 mrad. Combining this D-STEM capability in a Cs-probe corrected TEM with precession electron diffraction capabilities opens up the possibility to obtain crystallographic maps from samples with spatial resolution of approximately 1 nm or below. In the following sections, different applications of the D-STEM technique coupled with precession electron diffraction and automated diffraction pattern recognition software are presented and their advantages discussed.