Metals nanocluster deposition

The goal of the present study is to establish the general method of metallic nanoclusters deposition onto any support. For this purpose, the synthesis procedure has been designed due to the following manners, which are four quite important keys. 

The use of colloidal metallic nanoclusters deposited onto solid substrates can provide a higher degree of control over the SPs spectral properties state-of-the-art results in the chemical synthesis showed, in fact, the possibility to grow nano-objects with high uniformity and low size dispersion [36-38], This can allow to fabricate extended substrates, in which the local morphology, and thus the resulting MEF effect, can be controlled with good precision [19, 39], As a counterpart, still some randomness is unavoidable in this approach, since it is not simple to define the position of the nanoclusters on the substrate with micrometer precision to realize, for instance, ordered arrays of metallic particles. 

Liquid-Phase Reductive Deposition of Metal Nanoclusters Selective onto Oxide Surfaces... 

The most common method for the production of carbon nanotubes is hydrocarbon-based chemical vapor deposition (CVD) [97] and adaptations of the CVD process [98, 99], where the nanotubes are formed by the dissolution of elemental carbon into metal nanoclusters followed by precipitation into nanotubes [100]. The CVD method is used to produce multiwalled carbon nanotubes (MWCNTs) [101] and double-walled carbon nanotubes (DWCNTs) [102] as well as SWCNTs [103], The biomedical applications of CNTs have been made possible through surface functionalization of CNTs, which has led to drug and vaccine delivery applications [104,105],... 

A crystalline bacterial surface layer with a well defined geometry of Sporosarcina ureae (so-called S layer) is used as a protein template (unit cell 13.2 nm x 13.2 nm) on a cell membrane. Noble metal nanoclusters (Pt or Pd) are deposited chemically to produce nanostructures. The spatial distribution of noble metal nanoclusters is characterized by transmission electron microscopy (TEM). 

The electronic structure, morphology, and chemical reactivity of metal nanoclusters have attracted considerable attention due to their extensive technological importance. Chemical reactions and their catalytic relevance have been investigated on a variety of well-characterized, supported model catalysts prepared by vapor deposition of catalytically relevant metals onto ultrathin oxide films in ultrahigh vacuum conditions. Such ultrathin film supports are usually prepared by vaporizing a parent metal onto a refractory metal substrate in an oxygen atmosphere at a high temperature. These unique model systems are particularly well suited for surface-... 

In another example, nanodustered Pt(0) catalysts based on cross-linked macro-molecular matrixes were evaluated in the hydrogenation of an a,(i-unsaturated aldehyde, citral. The monometallic catalysts exhibit remarkable selectivity for gera-niol/nerol when 2-3 nm, regularly shaped, spherical metal nanoclusters are deposited on the supports from solutions of solvated platinum atoms prepared by metal vapor synthesis (MVS). The immobilization in the polymer framework of ions of a second metal such as Fe(II), Co(II), or Zn(II) enhances the selectivity of the Pt catalysts by up to more than 90% [18],... 

The ordered P AA back-side and structured Al surface were used to produce self-organized metal nanoparticles. We used Au or amorphous carbon as add-layer for deposition of Ti or Fe nanostmctures. Both these metals have a weak wetting of the add-layer. The deposition was performed by a laser induced plasma deposition technique. In this process the energy of ions was about 20 eV. The highly ordered curved substrate surface defined position of the deposited clusters providing formation of highly ordered arrays of metal nanoclusters. A perspective application of such structures for terabit memory was demonstrated. For example, Ti nanoclusters covered by native oxide demonstrated irreversible transformation of I-V characteristics from barrier-like to the ohmic behavior after the action of current supplied by a tip of conductive AFM. 

The spontaneous noble metal deposition on noble metal surface occurs when freshly prepared and clean noble metal electrode is immersed in the solution containing different noble metal ions. This phenomenon has been reported in various systems like Ru /Pt(/i,, 0 [35, 36], P /Ru h,k,l,m) [37, 38], Pd -"/Ru(0001) [39], and Pd /Pt h,kJ) [40, 41]. The morphology of the deposit varies from monolayer high nanoclusters to larger 3D structures. The spontaneous noble metal on noble metal NMonNM) deposition occurs as a result of an irreversible surface controlled redox reaction among depositing noble metal ions and noble metal substrate. The substrate surface in this reaction becomes... 

Metal nanoclusters are produced via depositing a metal on the surface of a microphase separated P PMMA block copolymer. After deposition, the film is annealed. 

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