摘要
采用简单的FeCl3溶液水热方法,结合焙烧处理合成了α-Fe2O3纳米粉体;以所制备的α-Fe2O3为载体负载Ag纳米粒子,得到Ag/α-Fe2O3复合纳米材料.使用X射线衍射、透射电子显微镜、氮气吸附-脱附和X射线光电子能谱等对样品进行表征,并考察了Ag/α-Fe2O3复合材料在260℃下对甲醇、乙醇、乙醚、丙酮、正丁醇和正己醇等挥发性有机物的气敏行为.结果表明,Ag/α-Fe2O3传感器对这几种挥发性有机物展示了较高的灵敏度和快速、可逆的响应-恢复特性;与纯α-Fe2O3相比,Ag/α-Fe2O3复合材料的气敏性能显著提高,这可能与该复合材料表面独特的多孔结构和活性Ag纳米粒子对敏感反应的催化作用有关.
α-Fe2O3 nanoparticles were synthesized by a simple hydrothermal treatment of FeC13 solution, followed by a calcination process, without templates or pore-directing agents. The as-prepared α-Fe2O3 nanop- articles were further employed as support to obtain Ag/α-Fe2O3 hybrid. The hybrid was characterized by XRD, TEM and XPS techniques and its gas sensing performance was investigated for several volatile organic compounds （VOCs） including methanol, ethanol, ether, acetone, butanol and hexanol at an operating temper- ature of 260 °C. The Ag/α-Fe2O3 sensor presented a high sensitivity and fast response-recovery to these VOCs. Meanwhile, the Ag/α-Fe2O3 sensor exhibited a much higher response than the pure α-Fe2O3 sensor at the operating temperature of 260 °C, which may be related to the unique porous structure on the surface of the Ag/α-Fe2O3 hybrid and the catalytic action of active Ag nanoparticles for the sensing reactions.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2012年第9期1915-1919,共5页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:20977052,21177066)
天津市自然科学基金(批准号:11JCYBJC05100)资助
