Modification of MoO3 surfaces by vapour-deposited cobalt atoms

Morphology and chemical state of Co?Mo catalysts for growth ofBsingle-walled carbon nanotubes vertically aligned on quartz substrates

“…The two 2p 3/2 BEs at 780.9-781.0 and 783.3-783.5 eV are further assigned to Co 2+ in CoO and Co 2+ in CoMoO x , respectively, due to their agreement with CoO (780.0-780.7 eV) [17,39,40,44,45] and CoMoO 4 (780.5-781.2) [37][38][39]46] references. The relatively large BE deviation of Co 2+ in CoMoO x from Co 2+ in CoMoO 4 might result from the polarization effect or the nonstoichiometry when Co 2+ ions are incorporated into highly oxidized MoO 3 matrix [39,46,47]. The BE intensity ratio of Co 2+ in CoMoO x to that in CoO increased from 1.3 to 2.6 after reduction, indicating that more CoMoO x was formed at the expense of CoO and MoO 3 .…”

“…The reduced samples showed remarkable differences from calcined ones in two aspects. One is the appearance of a new BE at 777.8 eV, which is attributed to metallic Co (777.8-778.5 eV) [17,37,39,40]. The other is the decreased distance between the 2p 3/2 and the 2p 1/2 spin-orbit BEs by as large as 1.6 eV, while the 2p 1/2 BE remained almost unchanged.…”

Low-Temperature Growth of Carbon Nanotube Forests Consisting of Tubes with Narrow Inner Spacing Using Co/Al/Mo Catalyst on Conductive Supports

“…As the samples are not exposed to air after annealing, we can exclude the possible oxidation. Before H 2 annealing, in both substrates (with and without Al), the Co 2p has the typical lineshape of Co 2+ (yellow component), with a possibly small amount of Co 3+ (green component), 42 while the Mo 3d is found to be mainly in a metallic state, with possibly a very small contribution of Mo 4+ . 43 We note that Al 2p peak is overlapped with Co 3p peak, and is too small to be observed.…”

“…42 The Mo 3d levels are reproduced using different doublets corresponding to Mo 0 (3d 5/2 at 228.0 eV, 3d 3/2 at 231.1 eV), Mo 4+ (3d 5/2 at 228.4 eV, 3d 3/2 at 231.9 eV) and Mo 6+ (3d 5/2 at 233.0 eV, 3d 3/2 at 236.1 eV). 43 The depth profiles of substrate are analyzed by time-of-flight secondary ion mass spectroscopy (TOF-SIMS, ION-TOF TOF.SIMS 5).…”

High‐Efficiency Inverted Polymer Solar Cells with Transparent and Work‐Function Tunable MoO3‐Al Composite Film as Cathode Buffer Layer

“…As shown in Figure 2a, the Mo 3d 5/2 peak gradually shifted towards the low binding energy with increase of the Al content. For the thermally deposited pristine MoO 3 film, the Mo 3d 5/2 peak located at 232.9 eV, corresponding to the response of Mo 6+ 35, 36. When the 33% and 55% Al were introduced into MoO 3 , the binding energies of Mo 3d 5/2 peaks shifted to 229.3 and 228.0 eV, respectively, suggesting that major portion of Mo 6+ ions were reduced to Mo 4+ and Mo 0 in these two cases 35.…”