Adsorption/combustion-type gas sensors employing mesoporous γ-alumina loaded with core(Au)/shell(Pd) nanoparticles synthesized by sonochemical reduction
Adsorption/combustion-type gas sensors employing mesoporous γ-alumina loaded with core(Au)/shell(Pd) nanoparticles synthesized by sonochemical reduction
复制标题
采用声化学还原法合成的负载核（Au）/壳（Pd）纳米颗粒的介孔γ-氧化铝的吸附/燃烧型气体传感器
DOI：
10.1016/j.snb.2014.06.016
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发表时间：
2014
影响因子：
8.4
通讯作者：
Y. Shimizu
中科院分区：
文献类型：
--
作者：
T. Hyodo;Yasunari Yuzuriha;O. Nakagoe;Takahiko Sasahara;S. Tanabe;Y. Shimizu
采用声化学还原法合成的负载有核（Au）/壳（Pd）纳米颗粒的介孔γ-氧化铝（mp-Al2O3）粉末的吸附/燃烧型气体传感器（n（Au/Pd）/mp-Al2O3，n：Au/Pd纳米颗粒的负载量，（0.1–1.0wt％），Au：Pd=1：4重量）已经制造并传感已在空气中研究了乙醇、甲苯和正己烷的性质。然后(Au/Pd)/mp-Al2O3传感器在较低温度下对这些目标气体表现出比通过一般浸渍技术负载Au和Pd的mp-Al2O3粉末制造的传感器(n(Au-Pd)/mp-Al2O3传感器，Au:Pd = 1:4重量)更大的响应，特别是当负载到mp-Al2O3粉末上的Au和Pd量减少时（≤0.5 重量%）。这些传感特性似乎很大程度上取决于 γ-氧化铝表面负载的金和钯的形态和成分特征。此外，(Au/Pd)/mp-Al2O3传感器对乙醇的响应比对甲苯和正己烷的响应大得多，这可能是因为它们分子的极性(偶极矩和介电常数)大小不同。然而，传感器显然可以检测到偶极矩和介电常数极低的 10 ppmn-己烷。这些结果表明 then(Au/Pd)/mp-Al2O3 传感器可以检测较低浓度的这些气体以及其他 VOC。
Adsorption/combustion-type gas sensors employing mesoporous γ-alumina (mp-Al2O3) powders loaded with core(Au)/shell(Pd) nanoparticles, which were synthesized by sonochemical reduction, (n(Au/Pd)/mp-Al2O3,n: the amount of Au/Pd nanoparticles loaded, (0.1–1.0 wt%), Au:Pd = 1:4 in weight) have been fabricated and their sensing properties to ethanol, toluene andn-hexane have been investigated in air. Then(Au/Pd)/mp-Al2O3sensors showed larger responses to these target gases at lower temperatures than those of sensors fabricated with mp-Al2O3powders loaded with Au and Pd by general impregnation technique (n(Au-Pd)/mp-Al2O3sensors, Au:Pd = 1:4 in weight), especially when the amount of Au and Pd loaded onto the mp-Al2O3powders was reduced (≤0.5 wt%). These sensing properties seem to be largely dependent on the morphological and compositional characteristics of Au and Pd loaded on the γ-alumina surface. In addition, then(Au/Pd)/mp-Al2O3sensors showed much larger response to ethanol than those to toluene andn-hexane, probably because of the difference in the magnitude of polarity (dipole moment and dielectric constant) of their molecules. However, the sensors obviously detected even 10 ppmn-hexane with the extremely low dipole moment and dielectric constant. These results promise that then(Au/Pd)/mp-Al2O3sensors can detect the lower concentration of these gases as well as other VOCs.