NiO/Fe_(2)O_(3)复合材料制备与气敏性综合实验设计  

Comprehensive experimental design about preparation and gas sensing properties of NiO/Fe_(2)O_(3) composites

作　　者：宋学志 童光耀 张旭 王治宇 王小风 SONG Xuezhi;TONG Guangyao;ZHANG Xu;WANG Zhiyu;WANG Xiaofeng(School of Chemical Engineering,Dalian University of Technology(Panjin Campus),Panjin 124221,China;School of Chemical Engineering,Dalian University of Technology,Dalian 116024,China;School of Physics,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学(盘锦校区)化工学院,辽宁盘锦124221 [2]大连理工大学化工学院,辽宁大连116024 [3]大连理工大学物理学院,辽宁大连116024

出　　处：《实验技术与管理》2024年第2期250-255,共6页Experimental Technology and Management

基　　金：大连理工大学教学改革一般项目(YB2023016)。

摘　　要：该综合实验通过煅烧金属有机框架材料制备中空NiO/Fe_(2)O_(3)纳米材料,并对材料的形貌、物相进行了结构表征。通过调整Ni和Fe的含量,对比了不同材料对正丙醇等气体的气敏性能,并提出可能的气敏机理。此实验将科研成果与实验教学相融合,旨在激发学生的科研兴趣,培养创新型、复合型和应用型高素质人才。[Objective]Gas sensors are pivotal in intelligent detection systems and have broad applications in medicine,indoor and outdoor air quality monitoring systems,environmental science,the automotive industry,and the military.In particular,semiconductive metal oxides have become the main choice for designing advanced gas sensors with high sensitivity,high stability,and low cost owing to their inherent physical and chemical properties.Compared with single-component materials,heterostructured bimetallic oxides offer superior features such as fast electron transfer,high carrier concentration,and low grain boundary potential barriers.These advantages often result in enhanced gas sensing performance.In addition,hollow structures with an inner cavity provide a more accessible surface and shorten the diffusion distance of target molecules,enabling effective surface reactions.Consequently,the integration of heterostructure and hollow structure serves as an effective strategy for enhancing gas sensing performance.[Methods]This paper proposes the preparation of an advanced hollow heterostructure for gas sensing using a metal–organic precursor.A primitive metal–organic precursor assembly was selected,using Ni^(2+)ions,anionic ligand(H_(2)BDC),and neutral ligand(DABCO).Another metallic Fe element,with varying content,was introduced using the impregnation method to form bimetallic precursors(HXR-Fe).Following thermal annealing in air,bimetallic NiO/Fe_(2)O_(3)-1∶1,NiO/Fe_(2)O_(3)-1∶2,and NiO/Fe_(2)O_(3)-1∶4 heterostructures were obtained and further employed as sensing materials.The sensing devices were fabricated by coating the sensing materials on the outer surfaces of alumina ceramic tubes.The sensing devices were then placed in a sealed gas box with a controllable working temperature and alternating gases,i.e.,air and target gas,for gas sensing measurement.[Results]The experimental results from both the materials synthesis and characterization revealed that the HXR-Fe sample exhibits hexagonal nanorods,with lateral d

关 键 词：气敏材料 综合实验 正丙醇 科教融合 

分 类 号：TB33[一般工业技术—材料科学与工程] G642.1[文化科学—高等教育学]