State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University , 2699 Qianjin Street, Changchun 130012, People's Republic of China.
Institute of Physical Chemistry, University of Tuebingen , Auf der Morgenstelle 15, 72076 Tuebingen, Germany.
ACS Appl Mater Interfaces. 2018 Feb 14;10(6):5835-5844. doi: 10.1021/acsami.7b19641. Epub 2018 Feb 2.
The design of semiconductor metal oxides (SMOs) with well-ordered porous structure has attracted tremendous attention owing to their larger specific surface area. Herein, three-dimensional inverse opal InO microspheres (3D-IO InO MSs) were fabricated through one-step ultrasonic spray pyrolysis (USP) which employed self-assembly sulfonated polystyrene (S-PS) spheres as a sacrificial template. The spherical pores observed in the 3D-IO InO MSs had diameters of about 4 and 80 nm. Subsequently, the catalytic palladium oxide nanoparticles (PdO NPs) were loaded on 3D-IO InO MSs via a simple impregnation method, and their gas sensing properties were investigated. In a comparison with pristine 3D-IO InO MSs, the 3D-IO PdO@InO MSs exhibited a 3.9 times higher response (R/R = 50.9) to 100 ppm acetone at 250 °C and a good acetone selectivity. The detection limit for acetone could extend down to ppb level. Furthermore, the 3D-IO PdO@InO MSs-based sensor also possess good long-term stability. The extraordinary sensing performance can be attributed to the novel 3D periodic porous structure, highly three-dimensional interconnection, larger specific surface area, size-tunable (meso- and macroscale) bimodal pores, and PdO NP catalysts.
具有有序多孔结构的半导体金属氧化物（SMOs）的设计由于其较大的比表面积而受到极大关注。在此，通过一步超声喷雾热解法（USP）制备了具有三维有序大孔结构的氧化铟微球（3D-IO InO MSs），该方法采用自组装磺化聚苯乙烯（S-PS）球作为牺牲模板。在 3D-IO InO MSs 中观察到的球形孔的直径约为 4nm 和 80nm。随后，通过简单的浸渍法将催化氧化钯纳米粒子（PdO NPs）负载在 3D-IO InO MSs 上，并研究了其气敏性能。与原始的 3D-IO InO MSs 相比，3D-IO PdO@InO MSs 在 250°C 时对 100ppm 丙酮的响应（R/R = 50.9）提高了 3.9 倍，并且具有良好的丙酮选择性。丙酮的检测限可以延伸到 ppb 水平。此外，基于 3D-IO PdO@InO MSs 的传感器还具有良好的长期稳定性。卓越的传感性能归因于新颖的 3D 周期性多孔结构、高度的三维互联、较大的比表面积、尺寸可调（中孔和大孔）双模态孔以及 PdO NP 催化剂。
