CAJ | 학술논문

本文用可控湿化学共沉淀法研制了ZnO-SnO2纳米晶体复合气敏材料并考察其对有毒气体CO和NO2的气敏性质.用TEM、BET和XRD等方法表征了纳米复合物的粒度、形貌、比表面、热稳定性和相稳定性.研究了制备的可控参数,如金属阳离子总浓度、沉淀pH值和老化时间等对复合物气敏性质的影响.研究结果表明,该纳米复合氧化物具有化学均一性,高度热稳定和相稳定性,对CO和NO2具有高的灵敏度和选择性,其气敏性质依赖于复合物组成、焙烧温度和操作温度.通过2wt%金属Cd的掺杂和10wt%Al2O3氧化物的表面包覆大大提高了气体的灵敏度和选择性.用程序升温吸脱附研究了纳米复合物表面对气体的吸脱附性能,并探讨了气敏机理.
본문용가공습화학공침정법연제료ZnO-SnO2납미정체복합기민재료병고찰기대유독기체CO화NO2적기민성질.용TEM、BET화XRD등방법표정료납미복합물적립도、형모、비표면、열은정성화상은정성.연구료제비적가공삼수,여금속양리자총농도、침정pH치화노화시간등대복합물기민성질적영향.연구결과표명,해납미복합양화물구유화학균일성,고도열은정화상은정성,대CO화NO2구유고적령민도화선택성,기기민성질의뢰우복합물조성、배소온도화조작온도.통과2wt%금속Cd적참잡화10wt%Al2O3양화물적표면포복대대제고료기체적령민도화선택성.용정서승온흡탈부연구료납미복합물표면대기체적흡탈부성능,병탐토료기민궤리.
Novel gas sensing materials of ZnO-SnO2 nanocomposites were developed using controlled coprecipitation and their sensitivity and selectivity were tested by the detection of environmentally toxic gases.Through manipulating the reaction conditions, such as the Sn/Zn cation ratio, metal salt total concentration,precipitation pH and aging time etc., the nanocrystalline composites with chemical homogeneity and superior thermal stability were successfully prepared and the optimized synthesis parameters have been established. The results showed that these nanocomposites exhibited high sensitivity and selectivity for the detection of CO and NO2, and the sensitivity was dependent on the composition of nanocomposites, calcination and operating temperatures. The sensing performance was greatly enhanced by the introduction of a small amount of Cd or Al2O3oxide coatings. The gas sensing mechanism of the nanocomposites was also discussed by temperature-programmed desorption (TPD) studies.