有序介孔材料合成束状磁性纳米线
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摘要
利用水热法合成有序介孔材料SBA-15,并利用SBA-15为模板合成CoFe_2O_4和NiFe_2O_4磁性纳米线。通过X射线粉末衍射、氮气吸附、场发射扫描电子显微镜和透射电子显微镜对SBA-15、CoFe_2O_4和NiFe_2O_4束状纳米线进行微观结构表征。结果表明,SBA-15具有二维六角直孔道结构,孔径在8nm左右,可作为一维纳米材料硬模板。以SBA-15为模板合成了束状CoFe_2O_4和NiFe_2O_4纳米线,纳米线直径与SBA-15介孔孔道大小接近。通过振动样品磁强计对合成的纳米线磁性能进行表征,结果显示合成的CoFe_2O_4磁性纳米线呈铁磁性,而NiFe_2O_4磁性纳米线则呈现超顺磁性。
Ordered SBA-15 mesoporous materials was synthesized by the hydrothremal method; then CoFe_2O_4 and NiFe_2O_4 magnetic nanowires were prepared using SBA-15 as template through the nano-replication method. Low-angle X-ray diffraction, N2adsorption-desorption, field-emission scanning electron microscopy and transmission electron microscopy were used to characterize the structure and morphology of the as-prepared SBA-15, bundled CoFe_2O_4 and NiFe_2O_4 nanowires. The results demonstrate that SBA-15 possesses the two-dimensional hexagonal straight channel structure with the pore size of about 8 nm, which could be used as the template to synthesize one-dimensional nanomaterials. The diameter of bundled CoFe_2O_4 and NiFe_2O_4 nanowires is similar to that of SBA-15. The magnetic properties of as-synthesized nanowires were characterized with vibrating sample magnetometer. The result indicate that CoFe_2O_4 nanowires present ferromagnetism, while NiFe_2O_4 nanowires possess superparamagnetism.
Ordered SBA-15 mesoporous materials was synthesized by the hydrothremal method; then CoFe_2O_4 and NiFe_2O_4 magnetic nanowires were prepared using SBA-15 as template through the nano-replication method. Low-angle X-ray diffraction, N2adsorption-desorption, field-emission scanning electron microscopy and transmission electron microscopy were used to characterize the structure and morphology of the as-prepared SBA-15, bundled CoFe_2O_4 and NiFe_2O_4 nanowires. The results demonstrate that SBA-15 possesses the two-dimensional hexagonal straight channel structure with the pore size of about 8 nm, which could be used as the template to synthesize one-dimensional nanomaterials. The diameter of bundled CoFe_2O_4 and NiFe_2O_4 nanowires is similar to that of SBA-15. The magnetic properties of as-synthesized nanowires were characterized with vibrating sample magnetometer. The result indicate that CoFe_2O_4 nanowires present ferromagnetism, while NiFe_2O_4 nanowires possess superparamagnetism.
引文
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[3]Jin H X,Li L,Chu N J et al.Mater Chem Phys[J],2008,112(1):112
[4]Zhu S M,Zhou Z Y,Zhang D et al.Micropor Mesopor Mater[J],2007,106(1):56
[5]Jung J S,Choi K H,Jung Y K et al.J Magn Magn Mater[J],2004,272-276(S1):1157
[6]Tajiri T,Deguchi H,Kohiki S et al.J Phys Soc Jpn[J],2006,75(11):1 137 041
[7]Souza K C,Salazar-Alvarez G,Ardisson J D et al.Nanotechnology[J],2008,19(18):185 603
[8]Kockrick E,Krawiec P,Schnelle W et al.Adv Mater[J],2007,19(19):3021
[9]Li S X,Zhang J C,Shen Y S et al.J Mater Sci Technol[J],2006,22(5):659
[10]Du Y,Liu S,Ji Y et al.J Magn Magn Mater[J],2008,320(14):1932
[11]Huang M H,Choudrey A,Yang P.Chem Commun[J],2000,2000(12):1063
[12]Tian B Z,Liu X Y,Yang H F et al.Adv Mater[J],2003,15(16):1370
[13]Tian B Z,Liu X Y,Soloyov L A et al.J Am Chem Soc[J],2004,126(3):865
[14]Cannas C,Gatteschi D,Musinu A et al.J Phys Chem B[J],1998,102(40):7721
[15]Ren Y,Jiao F,Bruce P G.Micropor Mesopor Mater[J],2009,121(1):90
[16]Wang X Q,Ge H L,Jin H X et al.Micropor Mesopor Mater[J],2005,86(3):335
[17]Wang X,Chen M,Li L et al.Mater Lett[J],2010,64(6):708
[18]Li F,Liu J,Evans D G et al.Chem Mater[J],2004,16(8):1579
[19]Jacobs I S,Bean C P.Phys Rev[J],1955,100(195):1060