| 室温研磨固相反应法制备γ-Fe2O3纳米粉体及其气敏性能研究 |
| Preparation and Gas Sensing Properties of γ-Fe2O3 Nanopowders by Solid-state Grinding Method at Room Temperature |
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| 摘要: 本文首次以硝酸铁Fe(NO3)3·9H2O、氢氧化钠NaOH和聚乙二醇(PEG-200)为反应物，采用室温研磨固相反应法合成了γ-Fe2O3纳米粉体，并用红外光谱(FTIR)、X射线粉末衍射(XRD)、透射电镜(TEM)和气敏元件测试系统对产物的结构、表观形貌及气敏性能进行表征。结果表明，FeOOH在300~500 ℃热处理1 h均为γ-Fe2O3晶相，粒径为4~10 nm；600 ℃热处理1 h后转化为α-Fe2O3晶相。300 ℃焙烧后获得的γ-Fe2O3纳米粉体制成的气敏元件对乙醇有较高的灵敏度和较好的选择性。另外，以FeCl3为铁源时仅能得到纯α-Fe2O3纳米粉体，表明不同的铁源和PEG碳链的长短对产物的形成具有至关重要的影响。 |
| 关键词: γ-Fe2O3纳米粉体 研磨固相反应法 气敏性能 聚乙二醇 |
| 基金项目: |
| Abstract: γ-Fe2O3 nanopowders have been synthesized by solid-state grinding method using
Fe(NO3)3·9H2O, NaOH and polyethylene glycol (PEG-200) as the starting material. The products have been characterized by FTIR, XRD, TEM and gas sensor measuring system. The result suggests that γ-Fe2O3 with particle size about 4~10 nm has been obtained when FeOOH calcined at 300~500 ℃ for 1 h, while α-Fe2O3 can be obtained calcined at 600 ℃ for 1 h. At the same time, the sensor has high sensitivity and good selectivity to ethanol gas. Besides, α-Fe2O3 nanopowders can be produced when
FeCl3 and polyethylene glycol (PEG-200) as the starting materials, indicating that different iron salt precursors and carbon chain length of polyglycol can evidently affect the final products. |
| Keywords: γ-Fe2O3 nanopowders solid-state grinding method gas sensing properties polyethylene glycol |
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| 景志红,吴世华.室温研磨固相反应法制备γ-Fe2O3纳米粉体及其气敏性能研究[J].无机化学学报,2006,22(3):483-487. |
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