Publication

Preparation of gold nanoparticles by heat treatment of sputter deposited gold on boron-doped diamond film electrode

Christos Comninellis, György Foti, Bahaa El Roustom
2005
Journal Articles

Abstract

A novel two-step method was developed to prep. gold nanoparticles on boron-doped diamond (BDD) electrode. It consisted of sputter deposition of max. 15 equiv monolayers of gold, followed by a heat treatment at 400-600 Deg in air. The as-sputtered gold deposits were highly dispersed (estd. particle size of 2-7 nm) but also unstable, a continuous potential cycling in the stability region of sulfuric acid leading to complete loss of the deposited gold. Subsequent heat treatment of as-sputtered deposits resulted in formation of a stable population of nanosized gold particles characterized by SEM and cyclic voltammetry. Gold nanoparticles with an av. size of 15-35 nm could be prepd. by this method on polycryst. BDD film electrode, the particle size being dependent of the deposited amt. The invariant voltammetric response of the heat-treated gold deposits confirmed their applicability for electrocatalysis. [on SciFinder (R)]

Official source

https://infoscience.epfl.ch/entities/publication/a5700e58-af48-4bf3-a72e-3ecd06c1b502

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Christos Comninellis, György Foti, Bahaa El Roustom
2005
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/a5700e58-af48-4bf3-a72e-3ecd06c1b502

About this result

Related concepts (28)

Sputter deposition

Sputter deposition is a physical vapor deposition (PVD) method of thin film deposition by the phenomenon of sputtering. This involves ejecting material from a "target" that is a source onto a "substrate" such as a silicon wafer. Resputtering is re-emission of the deposited material during the deposition process by ion or atom bombardment. Sputtered atoms ejected from the target have a wide energy distribution, typically up to tens of eV (100,000 K).

Gold

Gold is a chemical element with the symbol Au () and atomic number 79. It is a bright, slightly orange-yellow, dense, soft, malleable, and ductile metal in pure form. Chemically, gold is a transition metal and a group 11 element. It is one of the least reactive chemical elements and is solid under standard conditions. Gold often occurs in free elemental (native state), as nuggets or grains, in rocks, veins, and alluvial deposits.

Vacuum deposition

Vacuum deposition , also known as vacuum coating or thin-film deposition, is a group of processes used to deposit layers of material atom-by-atom or molecule-by-molecule on a solid surface. These processes operate at pressures well below atmospheric pressure (i.e., vacuum). The deposited layers can range from a thickness of one atom up to millimeters, forming freestanding structures. Multiple layers of different materials can be used, for example to form optical coatings.

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