Photodegradation of Mercaptopropionic Acid- and Thioglycollic Acid-Capped CdTe Quantum Dots in Buffer Solutions

被引:11
|
作者
Miao, Yanping [1 ]
Yang, Ping [1 ]
Zhao, Jie [1 ]
Du, Yingying [1 ]
He, Haiyan [1 ]
Liu, Yunshi [1 ]
机构
[1] Univ Jinan, Sch Mat Sci & Engn, Jinan 250022, Peoples R China
基金
中国国家自然科学基金;
关键词
Quantum Dots; Photodegradation; CdTe; Buffer Solution; IN-VIVO; NANOCRYSTALS; CELLS;
D O I
10.1166/jnn.2015.9800
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
CdTe quantum dots (QDs) were synthesized by 3-mercaptopropionic acid (MPA) and thioglycollic acid (TGA) as capping agents. It is confirmed that TGA and MPA molecules were attached on the surface of the QDs using Fourier transform infrared (FT-IA) spectra. The movement of the QDs in agarose gel electrophoresis indicated that MPA-capped CdTe QDs had small hydrodynamic diameter. The photoluminescence (PL) intensity of TGA-capped QDs is higher than that of MPAcapped QDs at same QD concentration because of the surface passivation of TGA. To systemically investigate the photodegradation, CdTe QDs with various PL peak wavelengths were dispersed in phosphate buffered saline (PBS) and Tris-borate-ethylenediaminetetraacetic acid (TBE) buffer solutions. It was found that the PL intensity of the QDs in PBS decreased with time. The PL peak wavelengths of the QDs in PBS solutions remained unchanged. As for TGA-capped CdTe QDs, the results of PL peak wavelengths in TBE buffer solutions indicated that S2- released by TGA attached to Cd2+ and formed CdS-like clusters layer on the surface of aqueous CdTe QDs. In addition, the number of TGA on the CdTe QDs surface was more than that of MPA. When the QDs were added to buffer solutions, agents were removed from the surface of CdTe QDs, which decreased the passivation of agents thus resulted in photodegradation of CdTe QDs in buffer solutions.
引用
收藏
页码:4462 / 4469
页数:8
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