ChemInform Abstract: Monodisperse FePt Nanoparticles and Ferromagnetic FePt Nanocrystal Superlattices.

Abstract

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Nanostructured Pt-alloy electrocatalysts for PEM fuel cell oxygen reduction reaction

“…Antolini et al 55 summarized the ordering effects of PtFe/C alloys reported from several groups. [81][82][83] For example, a PtFe/C alloy prepared by heat treatment at 750 1C and kept under flowing hydrogen for 12-15 h presented an ordered structure, and this ordered catalyst was found to be very stable when exposed to 0.5 M aqueous H 2 SO 4 . An insignificant amount (B0.6 ppm) of Fe was leached out during 16 h of testing, mainly from the free Fe ions present in the alloy.…”

“…Wang et al 28 and Sun 88 synthesized PtFe nanoparticles with various morphologies-spheres, nanowires and nanorods-using simultaneously the reduction of platinum acetylacetonate (Pt(acac) 2 ) and the thermal decomposition of iron pentacarbonyl (Fe(CO) 5 ). 81,89 Synthesis was conducted under reflux in a mixture of oleylamine (OAm) and octadecene (ODE) at 160 1C. Dimensional control of the PtFe nanostructures was achieved by tuning the volume ratio of OAm to ODE.…”

Direct chemical synthesis of L10-FePtAu nanoparticles with high coercivity

“…[1][2][3][4][5][6][7][8][9][10] Recent studies indicate that NdFeB, 11 and hexagonal SmCo 12 -based alloy NPs are ideal building blocks for fabricating nanostructured permanent magnet due to strong ferromagnetism observed within their unique structure. However, rare-earth metal-based alloy NPs of SmCo and NdFeB are extremely difficult to prepare and stabilize due to the easy oxidation of Sm(0) and Nd(0) in the alloy structures.…”

Engineering the synthesis of silica–gold nano-urchin particles using continuous synthesis

“…SERS active structures have been fabricated by complex with top-down methods, 4,12,16,17 but wet-chemical synthesis of gold nanoparticles offer potential advantages in simple, high yield, and limited scalable synthesis. 12,18,19,20,21,22 Gold nanostructures, such as nanorods, nanowires, tetrapods, nanoplates and star-shaped particles are particularly attractive for many applications because of their strong confinement of the electromagnetic field and high enhancement that can be tuned over a wide range of optical wave lengths in comparison with ordinary spherical structures. 11,[23][24][25][26][27] Combination of the metal nanostructure with a support material, such as in core-shells, raspberries, and crescents, affords additional advantages in tuning optical properties, improved chemical/mechanical stability, and ease of handling compared to free-standing nanoparticles.…”