Nanocomposites of PAn-DBSA/γ-Fe 2O 3 with electrical and ferromagnetic behavior(σ= 2.18×10 -3-5.00×10 -5 S/cm, M s=3.7-16.6 m 2·A/kg, H c=8 805.2-9 133.1 A/m) were prepared by a chemical modification-...Nanocomposites of PAn-DBSA/γ-Fe 2O 3 with electrical and ferromagnetic behavior(σ= 2.18×10 -3-5.00×10 -5 S/cm, M s=3.7-16.6 m 2·A/kg, H c=8 805.2-9 133.1 A/m) were prepared by a chemical modification-redoping method in a neutral medium. The products were characterized by TEM, XRD, UV-Vis, four-probe method, and magnetometer. The results indicate that the electrical and magnetic properties of the nanocomposites strongly depend on γ-Fe 2O 3 content. With the increase of γ-Fe 2O 3 content, the electrical conductivity is decreased and saturation magnetization is increased.展开更多
以FeSO_4·7H_2O为铁源,CTAB为表面分散剂,采用便利的水热合成法成功制备了高性能α-Fe_2O_3单晶纳米片。利用X射线衍射、扫描电镜和恒流充放电测试等手段对材料的物相、微观形貌和电化学性能进行表征。结果表明,在200 m A/g电流密...以FeSO_4·7H_2O为铁源,CTAB为表面分散剂,采用便利的水热合成法成功制备了高性能α-Fe_2O_3单晶纳米片。利用X射线衍射、扫描电镜和恒流充放电测试等手段对材料的物相、微观形貌和电化学性能进行表征。结果表明,在200 m A/g电流密度下,α-Fe_2O_3单晶纳米片的起始不可逆容量损失较小;在100次循环后,α-Fe_2O_3单晶纳米片仍然约有875 m Ah/g的充放电比容量,库伦效率保持在98%以上;在2000 m A/g的大倍率条件下,材料的充放电比容量依旧可达643 m Ah/g左右,表现出十分良好的循环稳定性和可逆性能。展开更多
Four different hematite (-Fe2O3) nanopowders with various morphologi es have been synthesized in the presence of surfactant (HPC) via hydrothermal ro ute at 180 ℃, using four kinds of iron salts, Fe2(SO4)3, FeC2O4, F...Four different hematite (-Fe2O3) nanopowders with various morphologi es have been synthesized in the presence of surfactant (HPC) via hydrothermal ro ute at 180 ℃, using four kinds of iron salts, Fe2(SO4)3, FeC2O4, FeSO4 and (NH4 )3Fe(C2O4)3, as precursor materials. The products were characterized by means of X-ray diffraction (XRD), transmission electron micrograph (TEM), Fourier transf orm infrared spectroscopy (FTIR) and magnetization measurements. The hysteresis measurements show that the products exhibit weak ferromagnetic property at room temperature. It is concluded that the different precursor materials and the pres ence of the surfactant are important factors that exert significant effects on t he morphologies and magnetic properties of the products.展开更多
文摘Nanocomposites of PAn-DBSA/γ-Fe 2O 3 with electrical and ferromagnetic behavior(σ= 2.18×10 -3-5.00×10 -5 S/cm, M s=3.7-16.6 m 2·A/kg, H c=8 805.2-9 133.1 A/m) were prepared by a chemical modification-redoping method in a neutral medium. The products were characterized by TEM, XRD, UV-Vis, four-probe method, and magnetometer. The results indicate that the electrical and magnetic properties of the nanocomposites strongly depend on γ-Fe 2O 3 content. With the increase of γ-Fe 2O 3 content, the electrical conductivity is decreased and saturation magnetization is increased.
文摘以FeSO_4·7H_2O为铁源,CTAB为表面分散剂,采用便利的水热合成法成功制备了高性能α-Fe_2O_3单晶纳米片。利用X射线衍射、扫描电镜和恒流充放电测试等手段对材料的物相、微观形貌和电化学性能进行表征。结果表明,在200 m A/g电流密度下,α-Fe_2O_3单晶纳米片的起始不可逆容量损失较小;在100次循环后,α-Fe_2O_3单晶纳米片仍然约有875 m Ah/g的充放电比容量,库伦效率保持在98%以上;在2000 m A/g的大倍率条件下,材料的充放电比容量依旧可达643 m Ah/g左右,表现出十分良好的循环稳定性和可逆性能。
文摘Four different hematite (-Fe2O3) nanopowders with various morphologi es have been synthesized in the presence of surfactant (HPC) via hydrothermal ro ute at 180 ℃, using four kinds of iron salts, Fe2(SO4)3, FeC2O4, FeSO4 and (NH4 )3Fe(C2O4)3, as precursor materials. The products were characterized by means of X-ray diffraction (XRD), transmission electron micrograph (TEM), Fourier transf orm infrared spectroscopy (FTIR) and magnetization measurements. The hysteresis measurements show that the products exhibit weak ferromagnetic property at room temperature. It is concluded that the different precursor materials and the pres ence of the surfactant are important factors that exert significant effects on t he morphologies and magnetic properties of the products.
