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J Mater Sci: Mater Electron (2014) 25:40244032 DOI 10.1007/s10854-014-2124-7
Janus nanober: a new strategy to achieve simultaneous enhanced magnetic-photoluminescent bifunction
Xue Xi Qianli Ma Ming Yang Xiangting Dong
Jinxian Wang Wensheng Yu Guixia Liu
Received: 9 May 2014 / Accepted: 20 June 2014 / Published online: 27 June 2014 Springer Science+Business Media New York 2014
Abstract Magnetic-photoluminescent bifunctional Janus nanobers have been successfully fabricated by electros-pinning technology using a homemade parallel spinneret. NaYF4:Eu3? and Fe3O4 nanoparticles (NPs) were respectively incorporated into polyvinyl pyrrolidone (PVP) and eleactrospun into Janus nanobers with NaYF4:Eu3?/PVP as one strand nanober and Fe3O4/PVP as another strand nanober. The morphologies, structures, magnetic and photoluminescent properties of the as-prepared samples were investigated in detail by X-ray diffractometry, scanning electron microscopy, transmission electron microscopy, energy dispersive spectrometry, vibrating sample magnetometry and uorescence spectroscopy. The results show Janus nanobers simultaneously possess superior magnetic and luminescent properties due to their special structure, and the luminescent characteristics and saturation magnetizations of the Janus nanobers can be tuned by adding various amounts of NaYF4:Eu3? NPs and Fe3O4
NPs. Compared with Fe3O4/NaYF4:Eu3?/PVP composite nanobers, the magnetic-photoluminescent bifunctional
Janus nanobers provide better performances due to isolating NaYF4:Eu3? NPs from Fe3O4 NPs. The novel magnetic-photoluminescent bifunctional Janus nanobers have potential applications in the elds of new nano-bio-label materials, drug target delivery materials and future nanodevices owing to their excellent magnetic and
luminescent performance. More importantly, the design conception and construction technology are of universal signicance to fabricate other bifunctional Janus nanobers.
1 Introduction
Since magnetic-photoluminescent bifunctional nanomaterials have been applied in medical diagnostics, optical imaging, nanodevice, etc. [1, 2], many researches are focused on their preparations and properties in recent years. In general, Fe3O4, MnFe2O4, CoFe2O4 or NiFe2O4 is adopted as the magnetic core of the magnetic-photo-luminescent bifunctional nanoparticles (NPs), while quantum dot, rare earth (RE) compound or uorescent dye is used as the luminescent shell [38]. Among these photo-luminescent materials, RE quadriuoride is one of the high efcient matrixes for RE ion-doped luminescent materials owing to its bumper 4f energy levels and low vibrational energies. Europium compounds have excellent luminescent properties owing to the ff electron transition of Eu3? ions, and they have received a widespread attention because of their excellent performance [9, 10]. In order to obtain new morphologies...