Surface functionalization of Co3O4 hollow spheres with ZnO nanoparticles for modulating sensing properties of formaldehyde
Surface functionalization of Co3O4 hollow spheres with ZnO nanoparticles for modulating sensing properties of formaldehyde
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Co3O4 空心球与 ZnO 纳米粒子的表面功能化用于调节甲醛的传感性能
DOI：
10.1016/j.snb.2017.01.102
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发表时间：
2017-06
影响因子：
8.4
通讯作者：
Liu Chung Chiun
中科院分区：
文献类型：
--
作者：
Bai Shouli;Guo Jun;Shu Xin;Xiang Xu;Luo Ruixian;Li Dianqing;Chen Aifan;Liu Chung Chiun
以SiO2球为硬模板，通过简便的沉淀法成功合成了具有3D分级结构的Co3O4空心球。 Co3O4的分级结构由于其稳定的多孔结构以及较大的比表面积，作为一种良好的基底材料可以进一步发挥作用。为了提高Co3O4的气敏性能，引入ZnO纳米颗粒对Co3O4进行改性，形成Co3O4/ZnO复合材料。通过XRD、FESEM、HRTEM和XPS分析对复合材料的结构和性能进行了表征。气敏实验表明，空心Co3O4/ZnO复合材料不仅具有比原始Co3O4高4倍的高灵敏度、快速响应和恢复能力，而且对10 ppm HCHO具有优异的选择性和相对较低的工作温度。如此优异的性能可能归因于中空分层结构和两种氧化物之间界面处p-n异质结的形成。
The Co3O4hollow spheres with 3D hierarchical structure have been synthesized successfully by a facile precipitation method using SiO2spheres as hard template. The hierarchical structure of Co3O4as a good substrate material can be further functioned because of its stable and porous structure as well as large specific surface. To improve the gas sensing properties of Co3O4, ZnO nanoparticles were introduced to modify Co3O4into the Co3O4/ZnO composites. The structure and properties of composite were characterized by XRD, FESEM, HRTEM and XPS analysis. Gas-sensing experiments reveal that the hollow Co3O4/ZnO composite not only exhibits high sensitivity that is 4 times higher than that of pristine Co3O4, rapid response and recovery but also has excellent selectivity and relatively low operating temperature to 10 ppm HCHO. Such excellent performance may be attributed to the hollow hierarchical structure and the formation ofp-nheterojunctions at interface between both oxides.
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