期刊
ADVANCED MATERIALS INTERFACES
卷 9, 期 9, 页码 -出版社
WILEY
DOI: 10.1002/admi.202102107
关键词
conductometric gas sensing; dual monitoring of toluene vapor; microporous-oxide-wrapped Au nanoparticles; monitoring of hazardous gases; surface-enhanced Raman spectroscopy
资金
- National Natural Science Foundation of China [11974352, 51771182, 52001305]
- China Postdoctoral Science Foundation [2019M662211, 2021T140675]
- Special Research Assistant Project of Chinese Academy of Sciences
This work proposes a novel and simple method for synthesizing microporous-ceria-wrapped gold nanoparticles. The method involves stacking ultrafine CeO2 particles on pre-prepared gold nanoparticles. The resulting nanoparticles have a uniform size and microporous CeO2 shells with adjustable thickness. The as-prepared Au@mp-CeO2 nanoparticles show excellent performance in accurately monitoring toluene vapor and other hazardous gases at room temperature.
This work proposes a novel and simple synthesis method for microporous-ceria-wrapped gold (Au@mp-CeO2) nanoparticles (NPs) based on linker molecule-induced stacking of ultrafine CeO2 particles (or beads) on the surface of pre-prepared gold NPs. The resulting NPs have a uniform size and microporous CeO2 shells with a mean thickness of 28 nm and porosity of 42%. The shell is highly tunable from about 4 to 30 nm thick. This method is universal and suitable for other metal@mp-oxide nanoarchitectures (such as Au@mp-CuO NPs, Au@mp-Cr2O3 NPs, Ag@mp-CeO2 NPs, and Ag@mp-CeO2 nanowires) simply via changing the pre-prepared metal cores or shell precursors. Most significantly, the as-prepared Au@mp-CeO2 NPs can be used for accurate monitoring of toluene vapor (10 ppm level) at room temperature based on their conductometric and surface-enhanced Raman spectroscopy (SERS) dual response. Moreover, these NPs can be also used for other hazardous gases, such as chlorobenzene, hydrogen sulfide, and 1-dodecanethiol. This excellent performance benefits from the micropore-enhanced interaction between CeO2 and gas molecules. This work not only provides new and controllable preparation for metal@mp-oxide nanoarchitectures, but also demonstrates the great potential applications of these materials in real-time and identifiable monitoring of hazardous gases.
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