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Sketch of a typical gold nanoparticle encased in dendrons. A single sulfur atom at the 'root' of each multiply branched dendron anchors it to the gold nanoparticle at the center. NIST and NCI/NCL researchers are studying the tiny constructs as a test bed and basic vehicle for many possible biomedical applications. Credit: Cho/NIST
Gold clusters in cluster chemistry can be either discrete molecules or larger colloidal particles. Both types are described as nanoparticles , with diameters of less than one micrometer. A nanocluster is a collective group made up of a specific number of atoms or molecules held together by some interaction mechanism. [ 1 ]
Colloidal gold is a sol or colloidal suspension of nanoparticles of gold in a fluid, usually water. [1] The colloid is coloured usually either wine red (for spherical particles less than 100 nm) or blue-purple (for larger spherical particles or nanorods). [2]
A nanoshell, or rather a nanoshell plasmon, is a type of spherical nanoparticle consisting of a dielectric core which is covered by a thin metallic shell (usually gold). [1] These nanoshells involve a quasiparticle called a plasmon which is a collective excitation or quantum plasma oscillation where the electrons simultaneously oscillate with ...
A nanoparticle or ultrafine particle is a particle of matter 1 to 100 nanometres (nm) in diameter. [1] [2] The term is sometimes used for larger particles, up to 500 nm, or fibers and tubes that are less than 100 nm in only two directions.
Gold nanoparticles in the size range of 2 to 5 nm catalyze CO oxidation with a TOF of about 1 s −1 at temperatures below 273 K (0 °C). The catalytic activity of nanoparticles is brought about in the absence of moisture when the support is semiconductive or reducible, e.g. TiO 2, MnO 2, Fe 2 O 3, ZnO, ZrO 2, or CeO 2
Nanoparticles can take on a non-spherical shape, such as this star-shaped gold nanoparticle. Morphology refers to the physical shape of a particle, as well as its surface topography, for example, the presence of cracks, ridges, or pores. Morphology influences dispersion, functionality, and toxicity, and has similar considerations as size ...
Nanosheets can also be prepared at room temperature. For instance, hexagonal PbO (lead oxide)) nanosheets were synthesized using gold nanoparticles as seeds under room temperature. [3] The size of the PbO nanosheet can be tuned by gold NPs and Pb 2+ concentration in the growth solution. No organic surfactants were employed in the synthesis process.
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