LaFeO3纳米粒子的制备及乙醇敏感性能

doi:10.16085/j.issn.1000-6613.2017.03.033

化工进展 ›› 2017, Vol. 36 ›› Issue (03): 1012-1017.DOI: 10.16085/j.issn.1000-6613.2017.03.033

LaFeO₃纳米粒子的制备及乙醇敏感性能

唐永军^1,2, 刘海峰¹, 张行泉¹, 聂川昊^1,2

1 西南科技大学分析测试中心, 四川绵阳 621010;
2 西南科技大学材料科学与工程学院, 四川绵阳 621010

收稿日期:2016-07-06 修回日期:2016-10-07 出版日期:2017-03-05 发布日期:2017-03-05
通讯作者: 刘海峰,博士,讲师,主要研究方向为晶体结构与功能材料。
作者简介:唐永军(1994-),男,硕士研究生,主要研究方向为功能材料。E-mail:1679913866@qq.com。
基金资助:
国家自然科学基金（51502249）、四川省教育厅重点项目（16ZA0133）、西南科技大学大学生创新基金（CX15-070）及西南科技大学博士研究基金（15zx7105）项目。

Preparation and the ethanol sensing properties of LaFeO₃ nanoparticles

TANG Yongjun^1,2, LIU Haifeng¹, ZHANG Xingquan¹, NIE Chuanhao^1,2

1 Analytical and Testing Center, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China;
2 School of Materials Science and Engineering, Mianyang 621010, Sichuan, China

Received:2016-07-06 Revised:2016-10-07 Online:2017-03-05 Published:2017-03-05

摘要/Abstract

摘要：

以FeNO₃·9H₂O、LaNO₃·xH₂O、柠檬酸、丙烯酰胺为原料，采用溶胶-凝胶法制备了钙钛矿结构的LaFeO₃纳米粒子。利用热分析（TG-DTA）、X射线衍射（XRD）、扫描电子显微镜（SEM）等手段研究了热处理温度、A位Y掺杂对LaFeO₃成相、晶体结构、形貌等的影响，发现溶胶-凝胶法制备LaFeO₃纳米粒子的成相温度低于500℃，A位Y掺杂增大了LaFeO₃晶粒的生长活化能、抑制了晶粒生长。以LaFeO₃纳米粒子为敏感材料制备了旁热式气敏元件，通过元件的乙醇敏感性能测试，结果表明，250℃时LaFeO₃气敏元件对不同浓度乙醇具有良好的气敏性；随着乙醇浓度的增大，元件的灵敏度近线性增长；700℃热处理获得未掺杂LaFeO₃的乙醇敏感性能最佳，其对100×10^-6乙醇的灵敏度可达54；A位Y掺杂量为10%（摩尔比）时，元件对乙醇的灵敏度更好，其对100×10^-6乙醇的灵敏度可达163。

关键词: LaFeO₃, 纳米粒子, 气敏, 乙醇, 吸附

Abstract:

LaFeO₃ nanoparticles with perovskite structure were prepared by sol-gel method using FeNO₃·9H₂O,LaNO₃·xH₂O,citric acid and acrylamide as raw materials. The effect of heat treatment temperature and doped Y on the crystal formation,crystal structure and micro morphology were investigated by thermal analysis(TG-DTA),X-ray diffraction(XRD) and scanning electron microscope (SEM). The results indicate that LaFeO₃ with perovskite structure can be prepared lower than 500℃ by sol-gel method. Doping of Y on A sites suppresses the increase of the average grain size of LaFeO₃ by increasing the activation energy of grain growth. The ethanol sensing properties of the sensors produced using LaFeO₃ nanoparticles were also tested. It indicates that LaFeO₃ nanoparticles show a significant response to ethanol solutions with different concentrations. With the increase of ethanol concentration,the sensitivities of these sensors are almost linearly increased. For LaFeO₃ without doping while treated at different heat treatment temperatures,the sample treated at 700℃ has the best ethanol sensing sensitivity, about 54 to ethanol concentration of 100×10^-6. When the amount of doped Y is 10%(molar ratio),the sensitivity of the gas sensors to ethanol is even better,reached 163 to ethanol concentration of 100×10^-6.

Key words: LaFeO₃, nanoparticles, sensing properties, ethanol, adsorption

中图分类号:

TP212.2

唐永军, 刘海峰, 张行泉, 聂川昊. LaFeO₃纳米粒子的制备及乙醇敏感性能[J]. 化工进展, 2017, 36(03): 1012-1017.

TANG Yongjun, LIU Haifeng, ZHANG Xingquan, NIE Chuanhao. Preparation and the ethanol sensing properties of LaFeO₃ nanoparticles[J]. Chemical Industry and Engineering Progress, 2017, 36(03): 1012-1017.

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LaFeO₃纳米粒子的制备及乙醇敏感性能

Preparation and the ethanol sensing properties of LaFeO₃ nanoparticles

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