The β-FeOOH nanorods and α-Fe₂O₃ hollows are successfully fabricated via hydrothermal method. The TEM and XRD analysis indicated that the morphology and size of β-FeOOH nanorods or α-Fe₂O₃ hollow structure are tuned by multifactorial parameters in preparation process. The water bath temperature, urea concentrations and hydrothermal temperature promotes the diversity on the size of β-FeOOH nanorods, while hydrothermal times beneficial to the different morphologies of β-FeOOH. The calcination treatment helps the phase transformation to α-Fe₂O₃ and the construction of α-Fe₂O₃ hollow structure. However, a mature and regular α-Fe₂O₃ nanohollow must couple the individual roles of above reaction parameters.

β型的FeOOH纳米棒和的α-Fe ₂ ö ₃中空部经由水热法成功地制备。的TEM和XRD分析表明，β-的FeOOH纳米棒或α-Fe的形态和尺寸₂ ö ₃中空结构是通过在制备过程中多因素的参数调整。水浴温度，尿素浓度和水热温度促进了β-FeOOH纳米棒尺寸的多样性，而水热时间有利于β-FeOOH的不同形态。焙烧处理有助于相转变的α-Fe ₂ ö ₃和α-Fe的结构₂ ö ₃中空结构。然而，成熟而规则的α-Fe₂ O ₃纳米空心必须耦合上述反应参数的各个作用。