采用高温有机液相法,以醋酸镍为前驱体,用三辛基膦作表面活性剂,用连续注入的方式,在不同的反应阶段加入三辛基膦,制备了Ni_3C@Ni核壳型纳米粒子(NPs)。催化性能研究表明,该核壳结构的活化能ΔE=60 k J/mol,低于单一镍纳米粒子(ΔENi=65...采用高温有机液相法,以醋酸镍为前驱体,用三辛基膦作表面活性剂,用连续注入的方式,在不同的反应阶段加入三辛基膦,制备了Ni_3C@Ni核壳型纳米粒子(NPs)。催化性能研究表明,该核壳结构的活化能ΔE=60 k J/mol,低于单一镍纳米粒子(ΔENi=65 k J/mol)的活化能;磁学性能研究表明,该纳米粒子为铁磁性,在300 K时的矫顽力为65.2 Oe,饱和磁感应强度为0.25 emu/g。退火后的产物为镍/氧化镍的核壳结构。电化学性能研究表明,该核壳结构具有较为稳定的循环可逆性,首次充放电容量较高,可作为新型锂离子电池负极材料。展开更多
We present an electrospray ionization technology(ESI) to fabricate Cu-core/PVA-shell nanoparticles. The transition of nanofiber-to-nanoparticle is achieved by adjusting the mass fraction of PVA shell material containi...We present an electrospray ionization technology(ESI) to fabricate Cu-core/PVA-shell nanoparticles. The transition of nanofiber-to-nanoparticle is achieved by adjusting the mass fraction of PVA shell material containing Cu nanoparticles.展开更多
We prepared Au/Ag core-shell nanoparticles by growing Ag shell onto 12 nm Au core, using silver nitrate and sodium citrate as the reactants. By changing the molar ratio of Ag to Au, the shell thickness and thus the si...We prepared Au/Ag core-shell nanoparticles by growing Ag shell onto 12 nm Au core, using silver nitrate and sodium citrate as the reactants. By changing the molar ratio of Ag to Au, the shell thickness and thus the size of bimetallic particles could be controlled in convenient way. The formation of core-shell structure was proved by UV-Vis spectra, transmission electron microscopy(TEM), etc.. The core-shell particles showed a more narrow size distribution than Ag colloid prepared without Au core. The SERS activity of the core-shell particles was investigated by using 2,4-dimethylpyridine as the probe, which strongly indicated their potential application in SERS substrate materials.展开更多
文摘采用高温有机液相法,以醋酸镍为前驱体,用三辛基膦作表面活性剂,用连续注入的方式,在不同的反应阶段加入三辛基膦,制备了Ni_3C@Ni核壳型纳米粒子(NPs)。催化性能研究表明,该核壳结构的活化能ΔE=60 k J/mol,低于单一镍纳米粒子(ΔENi=65 k J/mol)的活化能;磁学性能研究表明,该纳米粒子为铁磁性,在300 K时的矫顽力为65.2 Oe,饱和磁感应强度为0.25 emu/g。退火后的产物为镍/氧化镍的核壳结构。电化学性能研究表明,该核壳结构具有较为稳定的循环可逆性,首次充放电容量较高,可作为新型锂离子电池负极材料。
文摘We present an electrospray ionization technology(ESI) to fabricate Cu-core/PVA-shell nanoparticles. The transition of nanofiber-to-nanoparticle is achieved by adjusting the mass fraction of PVA shell material containing Cu nanoparticles.
文摘We prepared Au/Ag core-shell nanoparticles by growing Ag shell onto 12 nm Au core, using silver nitrate and sodium citrate as the reactants. By changing the molar ratio of Ag to Au, the shell thickness and thus the size of bimetallic particles could be controlled in convenient way. The formation of core-shell structure was proved by UV-Vis spectra, transmission electron microscopy(TEM), etc.. The core-shell particles showed a more narrow size distribution than Ag colloid prepared without Au core. The SERS activity of the core-shell particles was investigated by using 2,4-dimethylpyridine as the probe, which strongly indicated their potential application in SERS substrate materials.
