Nickel nanocrystals encapsulated in carbon shells were prepared by the large body knowledge developed for the growth of carbon nanotubes (CNTs), i.e. chemical vapor deposition. The products were characterized by trans...Nickel nanocrystals encapsulated in carbon shells were prepared by the large body knowledge developed for the growth of carbon nanotubes (CNTs), i.e. chemical vapor deposition. The products were characterized by transmission electron microscopy, XRD and FTIR. The results showed that the oxidization of CNT surface made it possible to interreact with nickel ions in solution. Ni-impregnated CNTs transformed into monocrystalline nickel nanoparticles supported on CNTs at 600 ℃ in nitrogen atmosphere. Subsequently, they would be covered with graphene layers during reaction with acetylene at 600 ℃. The formation mechanism has been preliminarily discussed on experimental results.展开更多
The europium p-chlorobenzoate complex with 1, 10-phenanthroline was synthesizd in the ethanol solution. The crystal structure of the complex, Eu (p-ClBA)3·phen (p-ClBA: p-chlorobenzoate, phen:1,10-phenanthroline)...The europium p-chlorobenzoate complex with 1, 10-phenanthroline was synthesizd in the ethanol solution. The crystal structure of the complex, Eu (p-ClBA)3·phen (p-ClBA: p-chlorobenzoate, phen:1,10-phenanthroline), was determined by the X-ray diffraction. The complex crystalizes in triclinic,space group Pl with a=1. 0054 (2), b=1.1858(3), c=1.4349 (7) nm,α=110. 52(3), β=96. 52(3), γ= 101. 95(2)°, V=1. 5348(8) nm3, z=1, Dx=1. 729 g/cm3,Mr=1597. 72, T= 299±1 K. The coordination number of the europium ion is eight. The coordination geometry of the Eu3+ ion is a distorted square antiprism. In the 7F→5Do excitation spectrum of the complex, there is one sharp peak at 580. 04 nm. This shows that the complex has one Eu3+ site only. 5Do→7Fj(j=1￣4) luminescence spectra have been obtained by the selectively excited 5Do level of the complex, which indicates that Eu3+ ions in the complex have equally chemical environments. Raman spectrum shows more than one coordination modes for the carboxylate groups in the complex. This is in agreement with the results of the structure determination.展开更多
文摘Nickel nanocrystals encapsulated in carbon shells were prepared by the large body knowledge developed for the growth of carbon nanotubes (CNTs), i.e. chemical vapor deposition. The products were characterized by transmission electron microscopy, XRD and FTIR. The results showed that the oxidization of CNT surface made it possible to interreact with nickel ions in solution. Ni-impregnated CNTs transformed into monocrystalline nickel nanoparticles supported on CNTs at 600 ℃ in nitrogen atmosphere. Subsequently, they would be covered with graphene layers during reaction with acetylene at 600 ℃. The formation mechanism has been preliminarily discussed on experimental results.
文摘The europium p-chlorobenzoate complex with 1, 10-phenanthroline was synthesizd in the ethanol solution. The crystal structure of the complex, Eu (p-ClBA)3·phen (p-ClBA: p-chlorobenzoate, phen:1,10-phenanthroline), was determined by the X-ray diffraction. The complex crystalizes in triclinic,space group Pl with a=1. 0054 (2), b=1.1858(3), c=1.4349 (7) nm,α=110. 52(3), β=96. 52(3), γ= 101. 95(2)°, V=1. 5348(8) nm3, z=1, Dx=1. 729 g/cm3,Mr=1597. 72, T= 299±1 K. The coordination number of the europium ion is eight. The coordination geometry of the Eu3+ ion is a distorted square antiprism. In the 7F→5Do excitation spectrum of the complex, there is one sharp peak at 580. 04 nm. This shows that the complex has one Eu3+ site only. 5Do→7Fj(j=1￣4) luminescence spectra have been obtained by the selectively excited 5Do level of the complex, which indicates that Eu3+ ions in the complex have equally chemical environments. Raman spectrum shows more than one coordination modes for the carboxylate groups in the complex. This is in agreement with the results of the structure determination.
