One-pot Preparation of YF3:Yb3+-Er3+/PNIPAm-co-PAA Thermosensitive Fluorescent Nanogels

doi:10.6023/A13101064

Acta Chimica Sinica ›› 2014, Vol. 72 ›› Issue (1): 89-94.DOI: 10.6023/A13101064 Previous Articles Next Articles

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一锅法制备YF₃：Yb³⁺-Er³⁺纳米晶复合PNIPAm-co-PAA纳凝胶及其荧光温敏行为

宋秋生, 杨森森, 盛锐, 李谭

合肥工业大学化工学院合肥 230009

投稿日期:2013-10-16 发布日期:2013-12-17
通讯作者: 宋秋生，E-mail：sqshfut@126.com E-mail:sqshfut@126.com
基金资助:
项目受安徽省教育厅自然科学研究项目（No. 2009AJZR0137）和合肥工业大学创新基金（No. 2013CXSY340）资助.

One-pot Preparation of YF₃:Yb³⁺-Er³⁺/PNIPAm-co-PAA Thermosensitive Fluorescent Nanogels

Song Qiusheng, Yang Sensen, Sheng Rui, Li Tan

School of Chemical Engineering, Hefei University of Technology, Hefei 230009, China

Received:2013-10-16 Published:2013-12-17
Supported by:
Project supported by the Science Foundation of Educational Department of Anhui Province of China (grant No. 2009AJZR0137) and Innovational Foundation of Hefei University of Technology (grant No. 2013CXSY340).

1. One-pot Preparation of YF₃:Yb³⁺-Er³⁺/PNIPAm-co-PAA Thermosensitive Fluorescent Nanogels.PDF(173KB)

Abstract

Rare-earth nanocrystals are a family of important nanomaterials due to their unique optical and electronic properties, and they are paid more attention for their applications in the areas of solar energy system, molecular imaging, optoelectronics and catalysis fields. The incorporation of rare-earth nanocrystals into smart gels, which combines the PL features of rare-earth nanocrystals with the reversible and stimuli-responsive properties of smart gels, will provide a new generation of fluorescence markers for practical application. In this paper, we report a one-pot method to prepare thermosensitive fluorescent nanogels from rare earth nanocrystals and PNIPAm-co-PAA nanogels. Firstly, using cysteamine, Er(NO₃)₃, Yb(NO₃)₃, Y(NO₃)₃ and NH₄F as raw materials, active YF₃:Yb³⁺-Er³⁺ nanocrystals with-NH₂ groups were synthesized by hydrothermal method. After that, in the present of the as-prepared active YF₃:Yb³⁺-Er³⁺ nanocrystals, N-isopropyl acrylamide (NIPAm) and N,N'-methylene bisacrylamide (BIS) were initiated by K₂S₂O₈.Finally, thermosensitive fluorescent nanogels of YF₃:Yb³⁺-Er³⁺/PNIPAm-co-PAA were fabricated by free radical polymerization and in-situ coupling reactions of 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide (EDC) and N-hydroxysuccinimide (NHS). The microstructure and performance of the as-prepared YF₃:Yb³⁺-Er³⁺ nanocrystals and the complex nanogels were investigated by differential scanning calorimeter (DSC), photoluminescence (PL), Fourier transform infrared (FTIR), X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM). As the evidence from the HRTEM images, active YF₃:Yb³⁺-Er³⁺ nanocrystals show well monodispersity with their size of about 6～10 nm, and the complex nanogels are polydisperse ones with their size of about 100～300 nm. The results of PL spectra at various temperatures suggest that, the active YF₃: Yb³⁺-Er³⁺ nanocrystal present weak double emitting peaks around 483 and 496 nm, which are resulted from the energy level splitting of ⁴F_7/2→⁴I_15/2transition of Er³⁺. As for the complex nanogels, the phenomenon of energy level splitting of Er³⁺ is different from that of the nanocrystals, with increasing ambient temperatures, double emitting peaks around 483 and 496 nm couple into an emitting peak around 489 nm gradually, and their intensity decreases correspondingly.

Key words: YF₃:Yb³⁺-Er³⁺nanocrystals, PNIPAm-co-PAA, thermosensitive, nanogel, PL intensity

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Song Qiusheng, Yang Sensen, Sheng Rui, Li Tan. One-pot Preparation of YF₃:Yb³⁺-Er³⁺/PNIPAm-co-PAA Thermosensitive Fluorescent Nanogels[J]. Acta Chimica Sinica, 2014, 72(1): 89-94.

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一锅法制备YF₃：Yb³⁺-Er³⁺纳米晶复合PNIPAm-co-PAA纳凝胶及其荧光温敏行为

One-pot Preparation of YF₃:Yb³⁺-Er³⁺/PNIPAm-co-PAA Thermosensitive Fluorescent Nanogels

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一锅法制备YF3：Yb3+-Er3+纳米晶复合PNIPAm-co-PAA纳凝胶及其荧光温敏行为