Abstract
A series of Cu x O self-assembled mesoporous microspheres (SMMs), with different and controlled morphology (virus-like, urchin-like, spherical), were synthesized by facile liquid phase approach. The morphology of the as-prepared Cu x O SMMs was evolved from spherical to virus-like shape by controlling the ratio of DI water in solution. It can also realize the transformation from loose assembly to dense assembly by extending the reaction time. These Cu x O SMMs exhibited good response to NO2 gas at room temperature, benefiting from their 3D self-assembly structure. Among these the resulting virus-like CuxO SNMMs-based sensor exhibits largely enhanced response to 1 ppm NO2 gas at room temperature. The enhanced response of the virus-like Cu2O SMMsbased sensor can be ascribed to the high surface area, hierarchical 3D nanostructures, micropores for effective gas diffusion, the heterojunctions formed between CuO and Cu2O, and the existence of abundant surface oxygen vacancies.
摘要
本文通过简单液相方法合成了一系列可控的、 不同形貌Cu x O自组装介孔微球(病毒状、 海胆状、 球形). 通过改变N,N二甲基甲酰胺(DMF)溶剂中痕量水的比例, 调控Cu x O微球形貌由球状发展为病毒状; 通过可控的化学动力学过程实现从疏松组装到紧密组装的演变. 由于其三维自组装结构, 这些Cu x O自组装介孔微球在室温下对NO2气体具有优良的响应特性. 结果表明, 病毒状Cu x O自组装介孔微球在 室温下对1 ppm NO2气体具有优异的敏感特性和响应特性. 气敏机理分析发现, 其优异气敏特性来源于病毒状Cu x O自组装介孔微球较高的比表面积、 分级三维纳米结构、 有效的气体扩散孔洞、 表面Cu2O/CuO的纳米异质界面以及表面有效的氧空位缺陷调控.
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Acknowledgements
This work was supported by the National Natural Science Foundation (51501010, 91323301, 51631001, 51372025 and 21643003). Prof. Shaohua Shen’s group from Xi’an Jiaotong University is acknowledged for their support in the electron paramagnetic resonance (EPR) measurements.
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Siyuan Li was born in Henan, China, in 1992. He received his BSc degree in 2016 from Zhengzhou University and is now studying in Beijing Institute of Technology for his MSc degree. His research interest focuses on metal oxide nanostructure and their gas sensor properties.
Mengting Wang was born in Henan, China, in 1990. She received her master degree in 2016 from the School of Materials Science & Engineering of Beijing Institute of Technology. Her research interest focuses on metal oxide nanostructure and their gas sensor properties.
Jiajia Liu received her PhD degree in 2010 from the Department of Chemical & Biomolecular Engineering of National University of Singapore, Singapore. Currently she is an assistant professor in the School of Materials and Engineering, Beijing Institute of Technology, China. Her currently research interests include the development of metal/semiconductor composite nanostructures and their applications in sensor, catalysis, optoelectronics and biology.
Jiatao Zhang was born in 1975. He earned his PhD in 2006 from the Department of Chemistry, Tsinghua University, China. Currently he is Xu Teli Professor in School of Materials and Engineering, Beijing Institute of Technology. He was awarded Excellent Young Scientist foundation of NSFC in 2013. He also serves as the director of Beijing Key Laboratory of Construction-Tailorable Advanced Functional Materials and Green Applications. His current research interests include inorganic chemistry of semiconductor based hybrid nanostructures to possess novel optical, electronic properties for applications in energy conversion and storage, catalysis, optoelectronics and biology.
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CuxO self-assembled mesoporous microspheres with effective surface oxygen vacancy and their room temperature NO2 gas sensing performance
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Li, S., Wang, M., Li, C. et al. Cu x O self-assembled mesoporous microspheres with effective surface oxygen vacancy and their room temperature NO2 gas sensing performance. Sci. China Mater. 61, 1085–1094 (2018). https://doi.org/10.1007/s40843-017-9224-x
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DOI: https://doi.org/10.1007/s40843-017-9224-x