Hydrophobic and Hydrophilic Quantum Dots Embedded in Poly(vinyl pyrrolidone) Fibers with Bright Photoluminescence
Hydrophobic and Hydrophilic Quantum Dots Embedded in Poly(vinyl pyrrolidone) Fibers with Bright Photoluminescence
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DOI：
10.1166/nnl.2015.1911
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发表时间：
2015-02
影响因子：
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通讯作者：
Yunshi Liu;Junpeng Wang;Quande Che;Ping Yang;Y. Yue
中科院分区：
文献类型：
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作者：
Yunshi Liu;Junpeng Wang;Quande Che;Ping Yang;Y. Yue
通过优化制备条件，将亲水性和疏水性量子点（包括油酸（OA）封端的CdSe、硫代二丙酰酸（TDPA）封端的CdSe和巯基乙酸（TGA）封端的CdTe）引入聚乙烯吡咯烷酮（PVP）纤维中，并采用静电纺丝法将其与PVP乙醇溶液进行复合.通过调节量子点的用量，研究了量子点表面态对纤维形貌的影响。量子点在PVP溶液和光纤中保持其光致发光（PL）峰值波长。通过将量子点分散在水中，而疏水量子点先分散在己烷中，制备了含有水溶性CdTe量子点的PVP纤维。随着CdSe量子点含量的增加，光纤的荧光强度逐渐增强。此外，由于棒状形貌和TDPA配体的性质，CdSe纳米棒具有明显的不均匀性和在纤维中的局部富集。纤维表面相当光滑，几乎没有褶皱。
Hydrophilic and hydrophobic quantum dots (QDs) including oleic acid (OA)-capped CdSe, thiodipropioyic acid (TDPA)-capped CdSe, and thioglycollic acid (TGA)-capped CdTe were incorporated into poly(vinyl pyrrolidone) (PVP) fibers via an electrospinning method using a PVP ethanol solution with PVP weight ratio of 8% which was obtained by optimizing preparation conditions. The amounts of the QDs were adjusted to investigate the effect of QD surface state on the morphologies of fibers. The QDs retained their photoluminescence (PL) peak wavelengths in PVP solutions and fibers. The PVP fiber with aqueous CdTe QDs was fabricated by dispersing QDs in water while the hydrophobic ones were firstly dispersed in hexane. With increasing the amount of CdSe QDs, the PL intensity of the fibers was gradually enhanced. In addition, CdSe nanorods were characterized by evident unevenness and local enrichment in the fibers because of rod morphology and properties of TDPA ligand. The fiber surface was rather smooth and it almost had no wrinkles.