Controlled growth of uniform silver clusters on HOPG

Wang, L.L.; Ma, Xu-Chun; Qi, Yitong; Jiang, Pengfei; Jia, Jin‐Feng; Xue, Qi‐Kun; Jiao, Jiwei; Bao, Xinhe

doi:10.1016/j.ultramic.2005.06.009

Cited by 15 publications

(15 citation statements)

References 17 publications

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“…Understanding such differences could be useful when choosing the most adequate type of surface modification for specific purposes. Thus, DBD air plasma treatment would be preferred over UVO oxidation when a significant and uniform increase in surface reactivity is required, for instance if the carbon surface is to be used as a support for catalyst particles, where the uniformity of the particle dispersion is often a critical issue [5,42]. On the other hand, oxidation by UVO would be the treatment of choice if corrals (i.e., the etch pits) are needed to confine molecules that are subsequently studied by scanning probe microscopy techniques [43], while surface reactivity is kept relatively low.…”

Section: Resultsmentioning

confidence: 99%

A comparison between physically and chemically driven etching in the oxidation of graphite surfaces

Solís‐Fernández

Paredes

Cosío

et al. 2010

Journal of Colloid and Interface Science

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Section: Resultsmentioning

confidence: 99%

A comparison between physically and chemically driven etching in the oxidation of graphite surfaces

Solís‐Fernández

Paredes

Cosío

et al. 2010

Journal of Colloid and Interface Science

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“…12,60,68,72 Bimetallic clusters are formed from sequential vapor deposition of Ru on Pt or Pt on Ru for 0.4-0.5 ML coverages of both metals on m-HOPG. 12,60,68,72 Bimetallic clusters are formed from sequential vapor deposition of Ru on Pt or Pt on Ru for 0.4-0.5 ML coverages of both metals on m-HOPG.…”

Section: Discussionmentioning

confidence: 99%

Platinum–ruthenium bimetallic clusters on graphite: a comparison of vapor deposition and electroless deposition methods

Galhenage

Xie

Diao

et al. 2015

Phys. Chem. Chem. Phys.

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Bimetallic Pt-Ru clusters have been grown on highly ordered pyrolytic graphite (HOPG) surfaces by vapor deposition and by electroless deposition. These studies help to bridge the material gap between well-characterized vapor deposited clusters and electrolessly deposited clusters, which are better suited for industrial catalyst preparation. In the vapor deposition experiments, bimetallic clusters were formed by the sequential deposition of Pt on Ru or Ru on Pt. Seed clusters of the first metal were grown on HOPG surfaces that were sputtered with Ar(+) to introduce defects, which act as nucleation sites for Pt or Ru. On the unmodified HOPG surface, both Pt and Ru clusters preferentially nucleated at the step edges, whereas on the sputtered surface, clusters with relatively uniform sizes and spatial distributions were formed. Low energy ion scattering experiments showed that the surface compositions of the bimetallic clusters are Pt-rich, regardless of the order of deposition, indicating that the interdiffusion of metals within the clusters is facile at room temperature. Bimetallic clusters on sputtered HOPG were prepared by the electroless deposition of Pt on Ru seed clusters from a Pt(+2) solution using dimethylamine borane as the reducing agent at pH 11 and 40 °C. After exposure to the electroless deposition bath, Pt was selectively deposited on Ru, as demonstrated by the detection of Pt on the surface by XPS, and the increase in the average cluster height without an increase in the number of clusters, indicating that Pt atoms are incorporated into the Ru seed clusters. Electroless deposition of Ru on Pt seed clusters was also achieved, but it should be noted that this deposition method is extremely sensitive to the presence of other metal ions in solution that have a higher reduction potential than the metal ion targeted for deposition.

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“…As mentioned above, application of HOPG, which is widely used as a support for metallic particles, [19][20][21][22][23][24] could be a good solution for the problem. The main advantage of HOPG is the very small background signals in the O1s region.…”

Section: Introductionmentioning

confidence: 99%

Model Ag/HOPG catalysts: preparation and STM/XPS study

Demidov

Prosvirin

Sorokin

et al. 2011

Catal. Sci. Technol.

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Model catalysts-Ag on highly oriented pyrolytic graphite (Ag/HOPG)-have been studied using scanning tunneling microscopy (STM), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and X-ray induced Auger electron spectroscopy (XAES). Two types of catalysts were compared: Ag nanoparticles supported on sputtered and non-sputtered HOPG, and the influence of graphite surface defects on the stabilization of Ag nano-sized particles was discussed. A procedure for the preparation of stable (up to 250 1C under a submillibar oxygen/ ethylene pressure) silver nanoparticles is suggested. The disappearance of Ag particles in STM images after a sample treatment in the ambient conditions is explained in terms of silver penetration into graphite and the loss of conductivity due to adsorption of contaminants.

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Controlled growth of uniform silver clusters on HOPG

Cited by 15 publications

References 17 publications

A comparison between physically and chemically driven etching in the oxidation of graphite surfaces

A comparison between physically and chemically driven etching in the oxidation of graphite surfaces

Platinum–ruthenium bimetallic clusters on graphite: a comparison of vapor deposition and electroless deposition methods

Model Ag/HOPG catalysts: preparation and STM/XPS study

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