Local, global and electronic structure of supported gold nanoclusters determined by EXAFS, XRD and XPS methods

Composition and structure of a-C:Au nanocomposites obtained by physical vapour deposition

“…One should note however that the above estimations are qualitative, because stable nanoclusters with magic numbers 13, 55, 147 and 309 have a different crystal structure from Au metal. Our estimates are confirmed nonetheless by experimental data showing that, for nanoclusters of several tens of unit cells (>1.6 nm), (1 1 1) and (2 0 0) reflexes are resolved [22].…”

Synthesis of Au/C Catalysts by Ultrasonic-Assisted Technique for Vinyl Chloride Monomer Production

“…1(a). The results show that all of fresh CI and UL samples have the XRD patterns similar to pure carbon support (CK sample) as the crystalline of Au 3+ cannot be detected by this technique or with insignificant Au 0 reflection detectable [24]. However, the XRD spectra of used catalysts are found the peaks of Au 0 reflection.…”

“…Temperature-programmed reduction (TPR) was used to determine the reduction temperature of Au 3+ . This analysis was carried out using a Micromeritics Chemisorb 2750 pulse chemisorption analyzer, with 10% H2 in Ar as a reducer and a temperature ramp of 30 to 400 o C (ramp rate = 10 o C/min, flow = 50 ml/min and held at final temperature for 30 min at 400 o C) [24].…”

Fourier Series and Fourier Transform with Applications in Nanomaterials Structure

“…The backscattering factor and the phase shift depend on the kind of atom responsible for scattering and its coordination shell (Aldea et al, 2007). The analysis of EXAFS data for obtaining structural information [N j , r j, …”

“…The structural parameters for the first coordination shell are determined by fitting the theoretical function χ j (k) given by the relation (60) with the experimental signal χ j (k) derived from relation (59). In the empirical EXAFS calculation, F(k,r,π) and δ j (k) are conveniently parameterized (Aldea et al, 2007).…”