珊瑚状镧铁金属氧化物复合材料的制备及其气敏性能研究  

Preparation and gas-sensing properties of coral-like lanthanum-iron metal oxide composites

作　　者：马靖威 孙丽霞[1,2] 叶鑫玲 陈建瑶 廖丹葵 孙建华[1,2] Ma Jingwei;Sun Lixia;Ye Xinling;Chen Jianyao;Liao Dankui;Sun Jianhua(School of Chemistry and Chemical Engineering,Guangxi University,Nanning 530004;Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology,Nanning 530004)

机构地区：[1]广西大学化学化工学院,南宁530004 [2]广西石化资源加工及过程强化技术重点实验室,南宁530004

出　　处：《化工新型材料》2024年第8期136-141,146,共7页New Chemical Materials

基　　金：国家自然科学基金(22165001,52002088);广西自然科学基金面上项目(2018GXNSFAA294001);广西创新驱动发展专项(桂科AA19254022)。

摘　　要：以硝酸镧、硝酸铁为原料,尿素为沉淀剂,十六烷基三甲基溴化铵为分散剂,采用微波-超声辅助法和煅烧工艺,制备珊瑚状镧铁金属氧化物复合材料用于三乙胺检测,考察不同镧铁摩尔比对材料结构和气敏性能的影响。结果表明:当原料中镧铁摩尔比为2∶1时,获得的珊瑚状镧铁金属氧化物复合材料LFO1在工作温度为250℃时对100×10^(-6)g/mL三乙胺气体的灵敏度响应值达到505,检测限为2.8×10^(-6)g/mL,并具有良好的选择性、稳定性以及快速响应特性。这种优异的气敏性能归因于珊瑚状结构所具有的大比表面积为LFO1提供了大量活性位点,从而增强其对三乙胺气体的吸附和扩散能力。The coral-like lanthanum-iron metal oxide composites were prepared for detecting triethylamine using lanthanum nitrate and iron nitrate as raw materials,urea as precipitant and cetyltrimethylammonium bromide as dispersant by microwave-ultrasonic-assisted method and calcination process.The effects of different lanthanum-iron molar ratios on the structure and gas-sensing properties of the materials were investigated.The results showed that when the molar ratio of lanthanum to iron in the raw material was 2∶1,the obtained coral-like lanthanum-iron metal oxide composite LFO1 achieved a sensitivity response value of 505 to 100×10^(-6)g/mL triethylamine gas at an operating temperature of 250℃,and the detection limit of LFO1 was 2.8×10^(-6)g/mL.Meanwhile,LFO1 had good selectivity,stability and fast response characteristics.This excellent gas-sensing performance was attributed to the high specific surface area of the coral-like structure,which provided a large number of active sites for LFO1,thereby enhancing its adsorption and diffusion ability towards triethylamine gas.

关 键 词：微波-超声辅助法 镧铁金属氧化物 三乙胺 气敏性能 气敏机理 

分 类 号：O6494[理学—物理化学]