Growth Mode Of Au Research Articles

Study of Au/Hg3In2Te6 interface by synchrotron radiation photoemission spectroscopy

The Au/Hg3In2Te6 interface was systematically investigated by synchrotron radiation photoemission spectroscopy (SRPES). Before the Au film prepared, the effects of the Ar+ ion etching process on elements and chemical bonding of the Hg3In2Te6 surface were studied first. The electronic structure and chemical reaction at the interface region with Au coverage ranging from 0.37 to 25 monolayers (ML) were also studied by exciting Te 4d, In 4d, and Au 4f core levels, respectively. Meanwhile, the growth mode of Au at MIT surface was confirmed to be the Volmer-Weber (VW) mode through the attenuation of Te 4d and In 4d core level signal strength. Moreover, chemical reactions between Au and Te with the product of AuTe2 were found at the Au/Hg3In2Te6 interface when Au deposition reached 0.72 ML. In addition, through the decomposition of Te 4d core level peaks at 25 ML of Au deposition, a re-bonding process of Hg-Te was found at the interface area. Finally, the interface formation process was summarized in detail.

Functionalization of silicon step arrays I: Au passivation of stepped Si(111) templates

The growth mode of Au on stepped Si(111)7×7 surfaces is determined by scanning tunneling microscopy, with the goal of providing a continuous gold layer that replicates the step morphology. Functionalization with gold allows attaching organic and biomolecules via thiol groups (e.g., alkanes and DNA). On clean Si(111), gold grows in the Stranski–Krastanov mode and produces islands with a size comparable to the step spacing. A Ti wetting layer produces smooth Au films that preserve the step topography down to a scale of a few nanometers.

The nucleation and growth of gold on silica

The nucleation and growth of Au clusters supported on SiO 2/Mo(1 1 0) has been studied by X-ray photoelectron spectroscopy (XPS), low energy ion scattering (LEIS), and temperature programmed desorption (TPD). Stoichiometric ultra-thin SiO 2 films were synthesized and characterized by Auger electron spectroscopy (AES) and XPS. At 300 K, the growth mode of Au at fractional monolayer coverages is quasi-two-dimensional (2D); at higher coverages, three-dimensional (3D) growth was found with no evidence of a significant chemical interaction between gold and silica. Annealing Au/SiO 2/Mo(1 1 0) to 1000 K led to sintering of the gold clusters. The desorption activation energies for Au coverages <0.2 monolayer equivalents were determined by TPD to be significantly lower than the sublimation energies found for higher coverages of Au clusters and for bulk gold.

Evidence for metal interaction in gold metallized polycarbonate films: An x-ray photoelectron spectroscopy investigation

The interfacial interactions between in situ thermally evaporated Au and polycarbonate (PC) film, a technologically important polymeric material, is studied by x-ray photoelectron spectroscopy (XPS). Angle resolved XPS is performed to investigate the Au reactivity if any, in forming the metal-polymer interface. The spectral evidence from the above suggests that the metal interacts predominantly with the carbonyl carbon of the monomeric unit with only minor interactions with the phenyl carbons without any complex formation. In contrast to previous findings of Au to be inert at the M-polymer interfaces, this work emphasizes the salient charge transfer type interactions of Au (as electron injector) at the C=O as the primary interaction site, distributing a net charge density to C=O with the formation of a Au-CO π-back bond. The conclusions are supported by the observed new C 1s feature at 282.6 eV and the O 1s and Au 4f7/2 XPS spectral changes. The growth mode of Au on PC was proceeded by the metal monolayer deposition with cluster growth on the already weakly bonded Au onto the C=O carbon of the polymeric backbone.

Stranski-Krastanov growth mode of Au on Mo(110) surface: Investigation by auger electron spectroscopy

Stranski-Krastanov growth mode of Au on Mo(110) surface: Investigation by auger electron spectroscopy