Synthesis of alloy AuCu nanoparticles with the L1₀ structure in an ionic liquid using sputter deposition.

Sputter deposition onto ionic liquids (ILs) was applied to synthesize AuCu bimetallic alloy nanoparticles (NPs) dispersed in 1-ethyl-3-methylimidazolium tetrafluoroborate (EMI-BF4). A mixed target of Au and Cu materials was used for simultaneous sputter deposition onto the IL under an Ar pressure of 10 Pa. Two types of heating procedures within the range of 323-573 K were examined for control of the structures of NPs, particularly addressing the phase transition of the alloy NPs from the face centered cubic (fcc) structure to the L1₀ structure.

Preparation and structure of a single Au atom on the TiO2(110) surface: control of the Au-metal oxide surface interaction.

Three-dimensional Au structures on bare and organic-compound-modified TiO2(110) surfaces were interrogated by Au L3-edge polarization dependent total reflection fluorescence X-ray absorption fine structure (PTRF-XAFS) spectroscopy. On the bare TiO2(110) surface, icosahedral Au55 nanoclusters were the main product found. When the surfaces were modified with ortho or meso mercaptobenzoic acid (o-MBA or m-MBA), Au was atomically dispersed.

Modulating the immobilization process of Au nanoparticles on TiO2(110) by electrostatic interaction between the surface and ionic liquids.

We found that the adsorption states of Au nanoparticles (NPs) on TiO(2)(110) varied with the ionic liquids (ILs) that encapsulate the NPs during the entire process from synthesis of NPs to immobilization of the NPs on the surface at 323 K. Five kinds of ILs, including three 1-butyl-3-methylimidazolium ([C(4)MIm]) cation-based ILs of tetrafluoroborate ([C(4)MIm][BF(4)]), hexafluorophosphate ([C(4)MIm][PF(6)]) and bis(trifluoromethylsulfonyl)amide ([C(4)MIm][NTf(2)]), and two [BF(4)] anion-based ILs of 1-(methoxymethyl)-1-methylpyrrolidinium ([PY1,1O1][BF(4)]) and N,N-diethyl-N-methyl-N-(2-methoxyethyl) ammonium ([N122,1O2][BF(4)]), were used. They provided different adsorption states of the Au NPs on the surface.

Scanning tunneling microscopy and photoemission electron microscopy studies on single crystal Ni2P surfaces.

The surface structures of nickel phosphide (Ni2P) single crystals were studied by scanning tunneling microscopy (STM) and photoemission electron microscopy (PEEM). Atomically resolved 1 x 1 images of the Ni2P(0001) and (1010) surfaces are successfully obtained with STM, whose respective dimensions of (0.59 nm x 0.

Aberration-corrected multipole Wien filter for energy-filtered x-ray photoemission electron microscopy.

The aberration of a multipole Wien filter for energy-filtered x-ray photoemission electron microscopy was analyzed and the optimized Fourier components of the electric and magnetic fields for the third-order aperture aberration corrections were obtained. It was found that the third-order aperture aberration correction requires 12 electrodes and magnetic poles.