Influence of morphology in the catalytic activity of bioconjugated platinum nanostructures

Abstract

Platinum nanoparticles stabilized by a protein, bovine serum albumin, have been synthesized successfully with two different morphologies such as cuboctahedra and nanorods. They have been characterized by the use of different techniques such as XPS, PCS, TEM, and STEM-HAADF. These nanoparticles have been applied as catalysts for the hydrogenation of allyl alcohol in an aqueous solution. A key finding of this article is the superior catalytic activity of the nanorods compared to the cuboctahedral particles. This difference in the catalytic activity was justified because of the variation in the amount of protein to stabilize the nanorods. A model for the nanorods and equations that describe the proportion of atoms in the different sites of the particle (face, vertex, edge, or interior) is used to calculate the percentage of atoms that are located on the nanorod surface. The stability of these particles as catalysts was also studied. The results showed that Pt nanorods and Pt cuboctahedra particles were degraded after 24 h of reaction.

Hydrogenation of allyl alcohols catalyzed by aqueous palladium and platinum nanoparticles

“…In presence of metal catalysts and hydrogen gas, several reactions are possible, i.e. C]C reduction (Scheme 1, reaction a), isomerization to saturated aldehydes (Scheme 1, reaction b), [48][49][50] hydrodeoxygenation to hydrocarbons (Scheme 1, reaction c), [51][52][53] oxidative dehydrogenation to unsaturated aldehydes (Scheme 1, reaction d) [54][55][56] and isomerization by double-bond migration (Scheme 1, reaction e). 57,58 The catalytic activity of our NPs was tested in presence of 2-propen-1-ol (20 mM) as the model substrate: the reactions were carried out for 24 hours in presence of 0.04 mmol L À1 Pd NPs or 0.07 mmol L À1 Pt NPs and hydrogen gas at 1.013 barr in water.…”

Investigation of platinum nanoparticle properties against U87 glioblastoma multiforme

“…Nanoparticles of platinum (NP-Pt) have unique physiochemical and biological [ 11 ] features with regard to their small size (< 25 nm), metal structures (Pt 0 ), large surface area to mass ratio [ 17 ], catalytic activity and high reactivity [ 18 ]. NP-Pt may also have different biochemical properties than platinum-based antineoplastic drugs after administration into an organism, because they are a very limited source of ions, and consequently the interaction of Pt (0) with body fluids is significantly restricted.…”

Influence of nanoparticles of platinum on chicken embryo development and brain morphology

“…Smaller nanoparticles can move across cellular and also nuclear membranes and are able to penetrate cells and intracellular structures, and target defined points within the body [9,10]. Platinum nanoparticles (NP-Pt) have recently elicited much interest because of their physicochemical properties such as catalytic activity and high reactivity [11]. NP-Pt, as metal structures (Pt 0 ), differ significantly from platinum salts and have quite different chemical properties when administered to an organism.…”