期刊
LANGMUIR
卷 36, 期 13, 页码 3386-3392出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.langmuir.0c00382
关键词
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资金
- Hokkaido University [18H01820, 19K22094, 17K14072]
- JSPS, Japan [18KK0159]
- Nanotechnology Platform program of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
- Tanigawa Fund Promotion of Thermal Technology
- Hosokawa Powder Technology Foundation
- Iwatani Naoji Foundation
- Cooperative Research Program of the Network Joint Research Center for Materials and Devices [20181111, 20191100]
- JSPS A3 Foresight Program Organic/Inorganic Nanohybrid Platforms for Precision Tumor Imaging and Therapy
- Hokkaido University
- Grants-in-Aid for Scientific Research [18KK0159] Funding Source: KAKEN
Metal@semiconductor core-shell nanoparticles (NPs) are widely used in photocatalysts, sensors, and optical applications owing to their unique metal-semiconductor interface and the integration of the properties from both core and shell materials. Although many efforts have been made toward the precise synthesis of Au@Cu2O core-shell structures, the chemical stability of Au@Cu2O aqueous suspensions, which is of great significance in many related applications, is not mentioned in any published research. Herein we report the synthesis of Au@Cu2O core-shell NPs with small shell thickness from 2 to 40 nm through a wet-chemistry method. The UV-vis absorption properties are found to be tunable with Cu2O thickness in the range of 2-40 nm. Furthermore, the chemical stability of Au@Cu2O core-shell nanoparticle suspensions in water/ethanol mixed solvents is investigated. It is found that water/ethanol mixed solvents with a larger amount of water are more likely to deteriorate the stability of Au@Cu2O NPs by oxidizing Cu2O to CuO. The results from this work may provide useful information for the preparation of metal@Cu2O water-based suspensions that are expected to be used for SERS, photocatalyst, or photothermal applications.
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