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Investigation on the stability of water-soluble ZnO quantum dots in KB cells by X-ray fluorescence and absorption methods |
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| Authors: | P. LuH. Zhang T. SatohT. Ohkubo A. YamazakiK. Takano T. KamiyaL. Zhu Y. HuangZ. Jiang Yi ZhengM. Yang Y. MiQ. Ren H. Shen |
| Affiliation: | a Institute of Modern Physics, Fudan University, 220 Handan Road, Shanghai 200433, China b Research Center for Analysis and Measurement, Fudan University, Shanghai 200433, China c Department of Advanced Radiation Technology, Japan Atomic Energy Agency (JAEA), 1233 Watanuki-machi, Takasaki, Gunma 370-1292, Japan d Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China |
| Abstract: | The structural stability of water-soluble ZnO quantum dots (QDs) in oral epidermoid carcinoma (KB) cells was studied by the External Micro Proton Induced X-ray Emission (External Micro-PIXE) technique and the X-ray absorption fine structure (XAFS) measurement. The External Micro-PIXE and XAFS experiments were respectively performed at the JAEA and the Shanghai Synchrotron Radiation Facility. The elements’ distributions were detected by the External Micro-PIXE technique. The XAFS method was applied to obtain information about zinc (Zn) K-edge spectra. The fits of the XAFS data showed that the Zn-O bond structure of water-soluble ZnO QDs was stable after being absorbed by KB cells. Its local structural parameters were almost identical with those of the standard wurtzite structure. Water-soluble ZnO QDs had good structural stability in KB cells. |
| Keywords: | Water-soluble ZnO Quantum dots Structural stability External Micro-PIXE XAFS |
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