CAJ | 학술논문

以低温水热法制备了TiO2-SnO2复合纳米晶粒,采用提拉法涂敷于带有金电极的氧化铝陶瓷管表面形成敏感薄膜,设计了一种新型薄膜式臭氧传感器。采用 X 射线衍射仪、热场发射扫描电子显微镜、能量色散X 射线谱仪和紫外-可见光谱能谱仪,表征了TiO2-SnO2纳米晶粒的晶体结构和微观形貌。采用紫外-可见吸收光谱法和电化学方法,讨论了TiO2-SnO2纳米晶粒对臭氧敏感机理与光电化学特性。在气体传感器静态测试系统上,采用XEDWS-60A型气敏元件分析仪测试了紫外光下臭氧传感器敏感特性、动态响应、抗干扰和稳定性。结果表明,以Ti与Sn摩尔比为6的TiO2-SnO2纳米晶粒为敏感薄膜的臭氧传感器,在相对湿度为40%和温度为25℃条件下,臭氧浓度为0.1~1.8μg/L时,有、无紫外光照射的臭氧传感器线性度分别为97.5%和78.5%,动态响应分别为2和9 s,恢复时间分别为5.5和15 s。此传感器对CO、NOx、甲醛、丙酮、丁醇和甲醇等气体具有良好的抗干扰性能。在汽车上连续使用12个月后,响应衰减了4.7%,响应正常时间为8.5个月。
이저온수열법제비료TiO2-SnO2복합납미정립,채용제랍법도부우대유금전겁적양화려도자관표면형성민감박막,설계료일충신형박막식취양전감기。채용 X 사선연사의、열장발사소묘전자현미경、능량색산X 사선보의화자외-가견광보능보의,표정료TiO2-SnO2납미정립적정체결구화미관형모。채용자외-가견흡수광보법화전화학방법,토론료TiO2-SnO2납미정립대취양민감궤리여광전화학특성。재기체전감기정태측시계통상,채용XEDWS-60A형기민원건분석의측시료자외광하취양전감기민감특성、동태향응、항간우화은정성。결과표명,이Ti여Sn마이비위6적TiO2-SnO2납미정립위민감박막적취양전감기,재상대습도위40%화온도위25℃조건하,취양농도위0.1~1.8μg/L시,유、무자외광조사적취양전감기선성도분별위97.5%화78.5%,동태향응분별위2화9 s,회복시간분별위5.5화15 s。차전감기대CO、NOx、갑철、병동、정순화갑순등기체구유량호적항간우성능。재기차상련속사용12개월후,향응쇠감료4.7%,향응정상시간위8.5개월。
TiO2-SnO2 composite nanocrystalline was prepared by the low temperature hydrothermal method. A new film-type ozone sensor was developed by using TiO2-SnO2 composite nanocrystallines transferred onto an alumina ceramic tube with Au electrodes by dip-coating method. The crystalline phase and microstructure of TiO2-SnO2 nanocrystallines were characterized by X-ray diffraction ( XRD) , field emission scanning electron microscope ( FE-SEM) , energy dispersive X-ray analysis ( EDAX) and ultraviolet-visible spectrometry ( UV-Vis) . The ozone sensitive mechanism and photoelectrochemical properties of TiO2-SnO2 nanocrystallines were analyzed by using ultraviolet-visible spectrometry and electrochemical method. These characteristic tests of ozone sensor were carried out on the traits of sensitive performance, dynamic response, interference and stability under ultraviolet-visible illumination by the XEDWS-60 A type multifunction analyzer in gas sensor static test system. the conclusion demonstrates that when the ozone sensor based on TiO2-SnO2 composite nanocrystalline ( molar ratio of Ti and Sn is 6 ) was under conditions of 40% relative humidity and 25 ℃operating temperature, when ozone concentration was increased from 0. 1 to 1. 8 μg/L, the best linearity of ozone sensor upon ultraviolet illumination and visible illumination were 97 . 5% and 78 . 5%, the dynamic response time was 2 s and 9 s, the recovery time was 5. 5 s and 15 s. This kind of sensor showed good anti-disturbance to the gases, such as CO, NOx , formaldehyde, acetone, butanol and methanol. The response value of ozone sensor was attenuated about 4 . 7%, when ozone sensor was applied continually on the automobile about 12 months, and its normal time was 8. 5 months.