通过硬质氧化法制备了孔径为150 nm,孔间距为230 nm的氧化铝模板。采用共沉淀法合成了具有超顺磁性的γ-Fe_2O_3纳米颗粒,其平均直径为8 nm。通过自下而上的组装工艺,将聚丙烯酸改性后带负电荷的γ-Fe_2O_3纳米颗粒和带正电荷的阳离子聚电解质聚合物在氧化铝模板的孔洞中组装成γ-Fe_2O_3纳米线阵列,并用SEM观察其形貌。采用振动样品磁强计(VSM)测得所制备的纳米线阵列的剩磁和矫顽力接近于零,说明该纳米线阵列具有超顺磁性。 Alumina templates with pore size of 150 nm and hole spacing of 230 nm were prepared by hard oxidation. The superparamagnetic γ-Fe_2O_3 nanoparticles were synthesized by coprecipitation method and their average diameter was 8 nm. Through the bottom-up assembly process, the polyacrylic acid modified negatively charged γ-Fe 2 O 3 nanoparticles and the positively charged cationic polyelectrolyte polymer are assembled into the γ-Fe 2 O 3 nanowire arrays in the pores of the alumina template, The morphology was observed with SEM. The measured residual magnetization and coercive force of the prepared nanowire arrays with the vibrating sample magnetometer (VSM) are close to zero, indicating that the nanowire arrays have superparamagnetism.