title: Ternary cobalt-iron phosphide nanocrystals with controlled compositions, properties, and morphologies from nanorods and nanorice to split nanostructures.
abstract: Structural phase-controlled formation of binary Co(2)P and CoP nanocrystals is achieved by reacting cobalt(II) oleate with trioctylphosphine. In the absence of oleylamine, Co(2)P nanowires are formed at both 290 and 320 °C. In the presence of oleylamine, Co(2)P nanorods are formed at 290 °C, and CoP nanorods are formed at 320 °C. With the simultaneous reaction of iron(III) oleate and cobalt(II) oleate with trioctylphosphine in the presence of oleylamine, ternary Co(2)P-type cobalt-iron phosphide nanostructures are produced at both 290 and 320 °C, corresponding to rice-shaped Co(1.5)Fe(0.5)P nanorods and split Co(1.7)Fe(0.3)P nanostructures, respectively. The controlled incorporation of iron into cobalt phosphide can alter the magnetic properties from paramagnetic binary Co(2)P to ferromagnetic Co(2)P-type ternary cobalt-iron phosphide nanostructures. Meanwhile, the time-dependent morphological evolution from small nanodots/nanorods, through seeded growth to unique split nanostructures is demonstrated in one-pot reaction at 320 °C.
authors.affiliation: Institute of Materials Research and Engineering, 3 Research Link, A*STAR (Agency for Science, Technology and Research), Singapore 117602, Singapore.
authors.forename: Enyi
authors.initials: E
authors.lastname: Ye
authors.forename: Shuang-Yuan
authors.initials: SY
authors.lastname: Zhang
authors.forename: Suo Hon
authors.initials: SH
authors.lastname: Lim
authors.forename: Michel
authors.initials: M
authors.lastname: Bosman
authors.forename: Zhihua
authors.initials: Z
authors.lastname: Zhang
authors.forename: Khin Yin
authors.initials: KY
authors.lastname: Win
authors.forename: Ming-Yong
authors.initials: MY
authors.lastname: Han
mesh_terms: D003035:Cobalt / Q000737:chemistry*; D003460:Crystallization; D007501:Iron / Q000737:chemistry*; D053758:Nanoparticles; D049329:Nanostructures / Q000737:chemistry*; D043942:Nanotubes / Q000737:chemistry*; D010316:Particle Size; D013499:Surface Properties
chemical_list: D003035:Cobalt; D007501:Iron