CAJ | 학술논문

以钛酸四丁酯、硝酸铬为原料,采用sol-gel法制备了w(Cr_2O_3)为0～30%的Cr_2O_3-TiO_2纳米粉体.利用XRD、TEM等测试手段分析了粉体的微观结构,采用静态配气法测试了由所制粉体制成的气敏元件对乙醇、CO、NO_2等气体的气敏性能.结果表明:用该法得到的粉体材料颗粒粒径小,且均匀;工作电压为4.0 V时,由w(Cr_2O_3)为20%的粉体在800 ℃烧结制得的气敏元件对体积分数为30×10~(-6)的乙醇的灵敏度最高可达282,且具有较好的响应-恢复特性,响应时间和恢复时间分别是10 s和24 s.
이태산사정지、초산락위원료,채용sol-gel법제비료w(Cr_2O_3)위0～30%적Cr_2O_3-TiO_2납미분체.이용XRD、TEM등측시수단분석료분체적미관결구,채용정태배기법측시료유소제분체제성적기민원건대을순、CO、NO_2등기체적기민성능.결과표명:용해법득도적분체재료과립립경소,차균균;공작전압위4.0 V시,유w(Cr_2O_3)위20%적분체재800 ℃소결제득적기민원건대체적분수위30×10~(-6)적을순적령민도최고가체282,차구유교호적향응-회복특성,향응시간화회복시간분별시10 s화24 s.
Cr_2O_3-doped TiO_2 nanopowders containing 0～30% Cr_2O_3 were prepared from Ti(OC_4H_9)_4 and Cr(NO)_3·9H_2O by the sol-gel method,and their microstructure was characterized by XRD and TEM.Gas sensors were fabricated from the prepared nanopowders,and the sensitivity of them to alcohol、CO、NO_2 were measured via the static volumetric method.The results indicate that the particle size of obtained nanopowders is small and constant.For sensors fabricated from nanopowders containing 20% Cr_2O_3 under a sintering temperature of 800 ℃,the maximum sensitivity to ethanol (volume fraction:30×10~(-6)) reaches 282 at a working voltage of 4 V; Moreover,such sensors exhibit superior response-recovery characteristics,and their response time and recovery time are 10 s and 24 s,respectively.