Paul D. Fleischauer's research while affiliated with Aerospace Corporation and other places

... The spacecraft industry, ultra-high vacuum (UHV) environment or high-temperature machinery require thin solid films as lubricants [1][2][3][4][5][6]. As solid lubricants, diamond-like carbon (DLC) and layered crystals are intensively studied [3,5,[7][8][9][10][11][12][13]. As an alternative to carbon-based materials, the micro-and nano-sized MoS 2 powders are used as effective solid lubricants for everyday applications. ...

... This results in the chemical formula MX 2 , with MoS 2 as the well-known representative of the group. The atoms within a monolayer are covalently bonded, while the bond between different monolayers is based on the van der Waals interaction [DF93,WD93]. The van der Waals forces are stronger in tellurides than in sulfides [WY69]. ...

... In situations, where solid additives are blended with liquid lubricants, the chemistry of steel surface plays a vital role. Didziulis et al. [11] studied the surface chemistry by XPS analysis and reported that the chemical composition of steel surface is 72% Fe, 18% Cr, 8% C, and 2% O. This analysis clearly reveals that Fe is much abundant than any other element present on the steel surface. ...

... MoS 2 /Sb 2 O 3 /Au composite films have been widely studied and applied [46][47][48][49][50], with typical contents of 82%MoS 2 , 11%Sb 2 O 3 , and 7%Au molar content. Scharf prepared 1μm thick MoS 2 /Sb 2 O 3 /Au composite films on 440C steel using magnetron sputtering [49] in drying N 2 , and the friction coefficient was 0.006 ~ 0.007 after a short friction coefficients of 0.006 ~ 0.007 after abrasion. ...

... El dióxido de titanio (TiO2) es un material inorgánico importante, con aplicaciones de uso en películas delgadas. El TiO2 en forma de películas se han utilizado a menudo en dispositivos microelectrónicos, en capacitores o en dispositivos metal-dieléctricos-semiconductores [1] [2]. También, las películas de TiO2 se utilizan como recubrimientos ópticos por su buena transmitancia en la región visible y alto índice de refracción [3]. ...

... As will be discussed later in this paper, MoS 2 may act in the intercalation processes as a reservoir of both electric charge and chemical species. Nevertheless, this sulfide behaves as a rather chemically inert substance [38]. Thus, etching using a standard solution of hydrochloric acid, nitric acid, or sulfuric acid leads to very rare or no incidence of holes on the surface after a normal etching time. ...

... One of the most important applications for MoS 2 nano-sheets is a substitute of 299 noble metal catalysts such as Pt/C. It has been proved that the active edges of Fig. 6.17 Schematic illustration of possible formation mechanisms of MoS 2 adsorbed film on the iron oxide layer (a) and the metal atom (b) (Tannous and Dassenoy 2011) Fig. 6.18 Variation of friction coefficient with the oxygen concentration in the film ( Fleischauer and Lince 1999) 368 used 5 wt% C 60 as a catalyst during the production 375 process. In a typical run, the reaction conditions were controlled as follows: 376 reaction time: 22 days; temperature: 1010 K; reactor: silica ampoule; pressure: 10 Fig. 6.21 in hydrogen/thiophene. ...

... Yet the changes of peaks identified as MoO 3 are not obvious, especially for the film after AO irradiation; the oxidation of MoS 2 mainly occurs on the surface of the film. Previous studies have demonstrated that proper laser irradiation can improve the crystallinity of composite film [23,24], and our work further proves that proper AO or UV irradiations will enhance the crystallinity of MoS 2 nanoparticles in the composite film. Based on the Raman and XPS spectra of the MoS 2 /DLC films before and after the AO and UV irradiations, it is identified that the AO irradiation can induce an increasing sp 3 C fraction in the film. ...

... [1][2][3][4][5][6] The fabrication methods for TMDs can be classified into two main categories. The first is bottomup synthesis, [7][8][9][10][11] which often necessitates expensive equipment and is primarily employed to produce monolayer films that cover a large area, ranging in the order of hundreds of microns. ...

... The strongest NbSe 2 (002) diffraction peaks in the Ti-0 films correspond to the HCP-NbSe 2 (002) crystal surface, suggesting that NbSe 2 films without Ti doping exhibited the highest crystallinity. These findings indicate that the basal plane of pure NbSe 2 is primarily aligned parallel to the substrate orientation, resulting in coatings with low friction coefficients and prolonged frictional lifetimes [21]. In comparison with the standard XRD pattern of NbSe 2 , the (002) diffraction peak shows a certain degree of low-angle deviation, indicating lattice distortion in the NbSe 2 film. ...