【SCI IF:7.233, Ranking:15/146=10.27% (Q1)】
| 論文篇名 | 英文：Magnetism and plasmonic performance of mesoscopic hollow ceria spheres decorated with silver nanoparticles 中文：表面鑲銀奈米粒之氧化鈰中空球磁性與電漿特性表現 |
| 期刊名稱 | Nanoscale |
| 發表年份,卷數,起迄頁數 | 2019 |
| 作者 | Eric Nestor Tseng, Ying-Ting Hsiao, Yi-Che Chen, Shih-Yun Chen*, Alexandre Gloter and Jenn-Ming Song(宋振銘) |
| DOI | doi:10.1039/C8NR09636H |
| 中文摘要 | 本研究調查表面鑲奈米銀粒之氧化鈰中空球磁性與表面電漿共振特性，尤其著重在介面與表面所扮演的角色。以本研究團隊新開發兩步驟法合成之氧化鈰中空球直徑介於100nm至1mm之間，表面銀粒徑則介於5-50nm。控制奈米銀粒子於氧化鈰球表面覆蓋率，光譜與微觀組織特徵確定奈米銀與氧化鈰間介面與表面顯現不同的表面電漿共振模式；該金屬-氧化物複合材亦具有室溫鐵磁性，與氧化鈰表面缺陷有關。STEM與EELS分析結果顯示，奈米銀表面及奈米銀與氧化鈰介面存在“熱點”，介面熱點發生於粒徑大於30nm之奈米銀，與發生於銀表面熱點相較有紅移現象。該複合材具優異表面增強拉曼散射(SERS)效果，以羅丹明6G染料為標的物，其偵測極限可達10-14M。強烈的SERS活性與不同模式熱點及幾何效應(可懸浮中空球與其尺寸分佈)有關。 |
| 英文摘要 | We investigate the role of interfaces and surfaces on the magnetic and surface enhanced Raman spectroscopy (SERS) properties of CeO2 hollow spheres decorated by Ag nanoparticles (H-CeO2@Ag). The composites, H-CeO2@Ag, were synthesized using a newly developed two-step process. The CeO2 hollow sphere diameter ranges from 100 nm to 2 mm and the grafted Ag nanoparticles (NP) size varies from 5 to 50 nm with a controllable coverage ratio. Spectroscopic and microscopic characterization confirms the formation of an interface between the Ag and ceria and shows different charge rearrangements occurring at both the interface and surface. Room temperature ferromagnetism was observed in all composites and is associated mostly with ceria surface defects. Strong SERS effect was reported with a detection limit down to 10-14 M for rhodamine 6G analytes. Scanning transmission electron microscopy and electron energy loss spectroscopy investigation reveals that hot-spots are associated with the silver NPs surfaces and also with Ag/ CeO2 interface. This interfacial hot spot occurs for metallic particles above 30 nm and is strongly red shifted with respect to the Ag surface plasmon. The strong SERS activity is then attributed to the presences of several types of hot-spots and the geometrical features (buoyant hollow sphere, size dispersion) of the composite. |
