A facile one-pot method to synthesize ultrasmall core-shell superparamagnetic and upconversion nanoparticles

详细信息    查看全文

• 作者：Qian Cheng^a ; Hongxuan Guo^a ; Yu Li^b ; Shouxin Liu^a ; ^{liushouxin@126.com" class="auth_mail" title="E-mail the corresponding author} ; Jiehe Sui^c ; ^{suijiehe@hit.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Wei Cai^c
• 关键词：Bifunctional nanoparticles ; Luminescence ; Magnetic materials ; Multimodal imaging
• 刊名：Journal of Colloid and Interface Science
• 出版年：2016
• 出版时间：1 August 2016
• 年：2016
• 卷：475
• 期：Complete
• 页码：1-7
• 全文大小：1954 K

文摘

Ultrasmall core-shell Fe₃O₄@NaYF₄:Yb³⁺/Er³⁺ nanoparticles with bifunctional properties have been successfully synthesized via one pot thermolysis method using oleylamine as both solvent and stabilizer. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), upconversion (UC) luminescence spectra and the physical properties measurement system (PPMS) were used to characterize the resulting samples. The synthesized samples have uniform morphology with a mean size of 14.5 nm and excellent dispersibility. Moreover, these nanoparticles exhibit superparamagnetic behaviour with saturation magnetization of 8.45 emμ/g and efficient up-conversion emission with a two-photon induced process when excited by a 980 nm laser. These results suggest that the synthesized ultrasmall bifunctional nanoparticles may find many biomedical applications, such as clinical diagnosis and treatment of cancers.