摘要
利用水热法合成了花状SnO_2微米材料,并以它作为基体,对其进行Au纳米颗粒修饰,得到了花状Au-SnO_2复合材料。利用X射线衍射(XRD)、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)分析等表征手段对所制备的Au-SnO_2复合材料进行了表征分析,结果表明,这种花状结构的材料是由厚度为30 nm^60 nm的SnO_2纳米片自组装而成,其尺寸为1μm^2μm。同时,我们用花状SnO_2和Au修饰的花状SnO_2复合材料对1×10^(-6)~500×10^(-6)的甲醛进行了气敏性能测试。结果表明,通过Au修饰,花状SnO_2对甲醛的气敏性能有了极大的提高。当甲醛浓度为200×10^(-6)时,其灵敏度(Ra/Rg)约为120,是花状SnO_2敏感材料的8倍,表现出很高的响应。另外,由Au修饰的花状SnO_2复合材料制成的敏感元件对甲醛表现出良好的选择性。这可能归因于Au纳米颗粒高效的催化活性促进了甲醛气体的扩散和O2的吸附,从而使其表现出更加优异的气敏性能。
Flower-like SnO_2 micro-nanomaterials were successfully synthesized using hydrothermal method and with it as substrates,then Au nanoparticles to decorated,getting a flower-like Au-SnO_2 composite sensitivematerial. The assynthesized flower-like Au-SnO_2 composite materialwere characterized by X-ray power diffraction( XRD),scanning electron microscopy( SEM),and X-ray photoelectron spectra( XPS),and the results showed that the flower-like structure material is self-assembled by SnO_2 nanoplates with thickness of 30 nm ~ 60 nm,the size is 1 μm ~ 2 μm. Subsequently,the sensitivity of SnO_2 and Au-decorated SnO_2 samples toward formaldehyde( 1×10-6~ 500×10-6) was investigated. It was shown that the flower-like SnO_2 decorated with Au exhibited very high responses towards 200 × 10-6formaldehyde( Ra/Rg= 120),which is eight times of the undecorated flower-like SnO_2. In addition,Au-decorated flower-like SnO_2 sensitive element showed good selectivity towards formaldehyde. This may ascribe to the catalytic activity of the Au nanoparticle which makes it easier for the diffusion of the formaldehyde gas and the adsorption of O_2.
出处
《传感技术学报》
CAS
CSCD
北大核心
2017年第8期1158-1162,共5页
Chinese Journal of Sensors and Actuators
基金
国家自然科学基金项目(21471120)
湖北省自然科学基金项目(2012IHA00201)
关键词
气体传感器
Au修饰
水热法
甲醛
气敏性能
gas sensor
Au decorated
hydrothermal method
formaldehyde
gas-sensing property
