硅酸盐学报

离子液体辅助合成α-Fe2O3纳米棒及其气敏性能

作者：潘帅1 贺蒙1 王旭1 解丽丽1 2 朱志刚1 2 郑嘹赢3

单位：(1. 上海第二工业大学工学部环境与材料工程学院上海 201209 2. 上海第二工业大学资源循环科学与工程中心上海 201209 3中国科学院上海硅酸盐研究所上海 200050)

分类号：0649

出版年,卷(期):页码：2019,47(3):0-0

DOI：

摘要：

采用水热合成法和热生长法，以六水氯化铁(FeCl3•6H2O)为铁源、氢氧化钠(NaOH)为沉淀剂、离子液体1-丁基-3-甲基咪唑氯化物([Bmim]Cl)为表面活性剂，两步合成了α-Fe2O3纳米棒，研究了沉淀剂NaOH和[Bmim]Cl添加量对产物形貌结构的影响，并且研究不同[Bmim]Cl添加量合成的α-Fe2O3纳米棒的气敏性能，结合能带理论分析了传感器的气敏响应机理。结果表明：当添加0.541 g FeCl3•6H2O和0.8 g NaOH，[Bmim]Cl的量为1 mmol时可以生成形貌均匀，分散性好，比表面积大的纯相α-Fe2O3纳米棒。气敏测试结果表明，其在工作温度为200 ℃下对5 μL•L–1的硫化氢气体的灵敏度达到8.4，检测范围达到0.1 ~ 20 μL•L–1，并且具有良好的稳定性和选择性，有望应用于工业和生活中低浓度的硫化氢气体检测。

α-Fe2O3 nanorods were synthesized via hydrothermal synthesis and thermal growth with ferric chloride hexahydrate (FeCl3•6H2O) as an iron source, sodium hydroxide(NaOH) as a precipitating agent and 1-butyl-3-methylimidazolium chloride ([Bmim]Cl) as a surfactant. The influence of concentration of NaOH/[Bmim]Cl on the morphology of the specimens was investigated. The gas sensitivity and response mechanism of α-Fe2O3 nanorods synthesized at different amounts of ionic liquids were analyzed based on the band theory. The results show that pure α-Fe2O3 nanorods with uniform morphology, good dispersibility and large specific surface area can be formed when 0.541 g FeCl3•6H2O and 0.8 g NaOH are added and the amount of [Bmim]Cl is 1 mmol. The sensitivity to 5 μL•L–1 hydrogen sulfide gas is 8.4, and the detection range is 0.1–20 μL•L–1, operating at 200 ℃. The α-Fe2O3 nanorods as a sensor have a good stability and a selectivity for hydrogen sulfide detection at low concentrations.

基金项目：

国家自然科学基金(61471233)；中国科学院无机功能材料与器件重点实验室开放课题(KLIFMD201602)；上海市高原学科-环境科学与工程(资源循环科学与工程)资助。

作者简介：

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