Optimized Preparation of CuS@SiO2 Core-Shell Nanoparticles with Strong LSPR Absorption and Excellent Photostability for Highly Efficient Solar-driven Interfacial Water Evaporation

doi:10.1007/s40242-023-3124-z

Chemical Research in Chinese Universities ›› 2023, Vol. 39 ›› Issue (4): 697-704.doi: 10.1007/s40242-023-3124-z

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Optimized Preparation of CuS@SiO₂ Core-Shell Nanoparticles with Strong LSPR Absorption and Excellent Photostability for Highly Efficient Solar-driven Interfacial Water Evaporation

MENG Chenchen¹, HUANG Min^1,2, LI Yunchao¹

1. Key Laboratory of Theoretical and Computational Photochemistry, Ministry of Education, College of Chemistry, Beijing Normal University, Beijing 100875, P.R. China;
2. Key Laboratory of Clean Energy and Carbon Neutrality of Zhejiang Province, Jiaxing Research Institute, Zhejiang University, Jiaxing 314031, P.R. China

Received:2023-05-14 Online:2023-08-01 Published:2023-07-18
Contact: LI Yunchao E-mail:liyc@bnu.edu.cn
Supported by:
This work was supported by the National Natural Science Foundation of China (Nos.21872011, 22272008).

Abstract

Abstract: Covellite copper sulfide nanocrystals(CuS NCs) are typical p-type semiconductors, showing strong optical absorption in the near-infrared(NIR) region thanks to their notable localized surface plasmon resonance(LSPR) properties. However, their LSPR properties and compositions are both highly susceptible to the external environment, which severely limits their practical applications. Until now, it remains a technical challenge to improve the structural and optical stability without sacrificing the LSPR performance of CuS NCs. Herein, to solve such a challenge, CuS@SiO₂ NPs with various silica shell thicknesses(CSNs-X nm) were synthesized in a well-controlled fashion via optimizing reverse microemulsion coating protocol. Compared with the pristine CuS NCs, the as-prepared CuS@SiO₂ NPs exhibited comparable LSPR properties but much higher photostability, enabling resistance to various harsh environments(e.g., high-power irradiation, strong reduction, and oxidation environment). Impressively, when used in solar-driven interfacial water evaporation, all the CuS@SiO₂ NPs exhibited excellent water evaporation performance with efficiencies beyond 70%(as high as 75.2% for CSN-23 nm) after 20 continuous testing cycles. Evidently, this paper is greatly helpful in better designing and fabricating high-performance plasmonic materials for practical photoelectrical, photothermal, and photocatalytic applications.

Key words: CuS nanocrystal, Localized surface plasmon resonance (LSPR), Silica coating, LSPR optical stability, Photothermal conversion, Solar-driven interfacial water evaporation

MENG Chenchen, HUANG Min, LI Yunchao. Optimized Preparation of CuS@SiO₂ Core-Shell Nanoparticles with Strong LSPR Absorption and Excellent Photostability for Highly Efficient Solar-driven Interfacial Water Evaporation[J]. Chemical Research in Chinese Universities, 2023, 39(4): 697-704.

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Optimized Preparation of CuS@SiO₂ Core-Shell Nanoparticles with Strong LSPR Absorption and Excellent Photostability for Highly Efficient Solar-driven Interfacial Water Evaporation

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