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首页> 外文会议>Nanotechnology 2009 : Technical proceedings >Enhancement of Photocatalytic Cancer Cell-Killing Activity by Using Ag@TiO_2 Core-Shell Composite Nanoclusters
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Enhancement of Photocatalytic Cancer Cell-Killing Activity by Using Ag@TiO_2 Core-Shell Composite Nanoclusters

机译：Ag @ TiO_2核壳复合纳米团簇增强光催化癌细胞杀伤活性

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摘要

The photocatalytic cancer cell-killing activity of the Ag metal core-TiO_2 shell (Ag@TiO_2) composite colloidal nanoclusters has been investigated on HeLa cells under the UV-visible light irradiation. The Ag@TiO_2 composite nanocluster photocatalyst with the uniform size and shape was successfully synthesized by a simple citrate reduction method. The photocatalytic cell-killing activity of the Ag@TiO_2 nanoclusters was found to vary with the molar ratio of Ag to TiO_2. The direct involvement of the metal particles in mediating the electron transfer from the photoexcited TiO_2 under the band gap excitation is considered to carry out the efficient photocatalytic reaction on the cells. The charge separation and the interfacial charge-transfer promote the photocatalytie cancer-cell killing more than the TiO_2 semiconductor alone. It was found that the Ag@TiO_2 nanoclusters under the low concentrations kill HeLa cells by 100%, whereas TiO_2 nanoparticles alone kill only ca. 25% under the same concentrations.
机译：研究了Ag金属核-TiO_2壳（Ag @ TiO_2）复合胶体纳米团簇在紫外可见光照射下对HeLa细胞的光催化杀癌细胞活性。通过简单的柠檬酸盐还原法成功地合成了尺寸和形状均一的Ag @ TiO_2复合纳米团簇光催化剂。发现Ag @ TiO_2纳米团簇的光催化杀死细胞的活性随Ag与TiO_2的摩尔比而变化。在带隙激发下，金属颗粒直接参与介导光激发的TiO_2的电子转移被认为对细胞进行了有效的光催化反应。电荷分离和界面电荷转移比单独使用TiO_2半导体更能促进光催化癌细胞的杀伤。发现在低浓度下，Ag @ TiO_2纳米团簇可杀死HeLa细胞100％，而单独的TiO_2纳米颗粒仅可杀死约20％。在相同浓度下为25％。

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  • 会议地点 Houston TX(US);Houston TX(US);Houston TX(US);Houston TX(US);Houston TX(US);Houston TX(US);Houston TX(US);Houston TX(US);Houston TX(US);Houston TX(US);Houston TX(US);Houston TX(US);Houston
  • 作者

    Md. Abdulla-Al-Mamun; Hailong Yang; Bashir Ahmmad; Yoshihumi Kusumoto;

  • 作者单位

    Kagoshima University, Faculty of Science Department of Chemistry and Bioscience, 1-21-35 Korimoto, Kagoshima 890-0065, Japan;

    Kagoshima University, Faculty of Science Department of Chemistry and Bioscience, 1-21-35 Korimoto, Kagoshima 890-0065, Japan;

    Kagoshima University, Faculty of Science Department of Chemistry and Bioscience, 1-21-35 Korimoto, Kagoshima 890-0065, Japan;

    Kagoshima University, Faculty of Science Department of Chemistry and Bioscience, 1-21-35 Korimoto, Kagoshima 890-0065, Japan;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 特种结构材料;
  • 关键词

    citrate reduction; Ag core-TiO_2 shell; composite nanoclusters; photocatalysis; cancer cell killing;

    机译：柠檬酸盐还原Ag核-TiO_2壳；复合纳米团簇光催化；癌细胞杀伤;

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