A large scale of CuS nano-networks: Catalyst-free morphologically controllable growth and their application as efficient
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ying Zhao School of Science, China University of Geosciences, Beijing 100083, People’s Republic of China
Zhenguang Shen School of Engineering and Technology, China University of Geosciences, Beijing 100083, People’s Republic of China; and State Key Laboratory of Information Photonics and Optical Communications, and School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, People’s Republic of China
Guoliang Zhang and Zhijian Penga) School of Engineering and Technology, China University of Geosciences, Beijing 100083, People’s Republic of China
Xiuli Fub) State Key Laboratory of Information Photonics and Optical Communications, and School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, People’s Republic of China (Received 26 September 2015; accepted 20 November 2015)
Morphologically controllable copper sulfide (CuS) nanoneedle, nanowall, and nanosheet networks on copper substrates have been fabricated by a simple, facile, and fast method based on low-temperature chemical vapor deposition through simply adjusting the reaction conditions such as the temperature and flow rate of argon gas. The compositional and structural analyses indicated that all the obtained nano-networks were single-crystalline. And their growths were possibly controlled by a solid–liquid–solid mechanism. The photocatalytic activities of the different shaped CuS nanostructures have been evaluated by their photodegradation on rhodamine B and methylene blue in aqueous phase, which revealed that in both cases the CuS nanoneedles nano-network exhibited better performance than the other two nanostructures.
I. INTRODUCTION
Contributing Editor: Xiaobo Chen Address all correspondence to these authors. a) e-mail: [email protected] b) e-mail: [email protected] DOI: 10.1557/jmr.2015.373
substances, such as azo and benzol groups, which contribute to an increasing risk in the incidence of bladder cancer among humans.8 To dispose the contaminants in aqueous and/or gas states, especially for the removal of organic compounds, many methods have been proposed, in which the use of photocatalyst has been recognized as a promising technology.1 For instance, it was reported that nanosized CuS materials could function as photocatalysts for the degradation of organic pollutants with preferable catalytic ability.1,8–10 But most of the tests on the photocatalytic activity of CuS nanostructures were carried out under UV light irradiation, although the band gap of nanosized CuS materials is only 1.27–2.22 eV, which implies that CuS nanostructures can, theoretically, assist the photocatalytic mineralization of dye molecules under visible light.8,11 Therefore, in the past few years, much attention has been paid on investigating the photocatalytic activity of various CuS nanomaterials under visible light, because photocatalysts that can utilize natural light (containing only 4% ultraviolet light) instead of UV light obviously show more advantages in environmental protection and energy conservation. Until no
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