Paramagnetic Nanocrystals: Remarkable Lanthanide-Doped Nanoparticles with Varied Shape, Size, and Composition

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• 作者：Rebecca J. Holmberg ; Tomoko Aharen ; Muralee Murugesu
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2012
• 出版时间：December 20, 2012
• 年：2012
• 卷：3
• 期：24
• 页码：3721-3733
• 全文大小：871K
• 年卷期：v.3,no.24(December 20, 2012)
• ISSN：1948-7185

文摘

Magnetic nanoparticles have been developed in recent years with applications in unique and crucial areas such as biomedicine, data storage, environmental remediation, catalysis, and so forth. NaYF₄ nanoparticles were synthesized and isolated with lanthanide dopant percentages, confirmed by ICP-OES measurements, of Er, Yb, Tb, Gd, and Dy that were in agreement with the targeted ratios. SEM images showed a distinct variation in particle size and shape with dopant type and percentage. HRTEM and XRD studies confirmed the particles to be crystalline, possessing both 伪 and 尾 phases. Magnetic measurements determined that all of the nanoparticles were paramagnetic and did not exhibit a blocking temperature from 2 to 300 K. The multifunctional properties of these nanoparticles make them suitable for many applications, such as multimodal imaging probes, up-conversion fluorescent markers, as well as MRI contrast agents.