Anatase TiO2 nanocomposites for antimicrobial coatings
Anatase TiO2 nanocomposites for antimicrobial coatings
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DOI：
10.1021/jp0502196
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发表时间：
2005-05-12
影响因子：
3.3
通讯作者：
Lin, CT
中科院分区：
文献类型：
--
作者：
Fu, GF;Vary, PS;Lin, CT
使用溶胶-凝胶化学方法来制造锐钛矿形式的 TiO2 纳米颗粒。结果表明，颗粒尺寸对使用 HClO4 或 HNO3 作为酸催化剂很敏感。通过化学还原或光还原方法在 TiO2 纳米粒子表面还原金来制备金修饰的 TiO2 纳米复合材料。成功制备了不同比例的钒掺杂TiO2纳米颗粒，将TiO2吸收波长从紫外区扩展到可见光区。通过 XRD、TEM、AFM 和 UV-vis 光谱表征，合成的纳米复合材料具有约 12-18 nm 的尺寸和锐钛矿相。 TiO2 纳米复合涂层已应用于载玻片基底上。对TiO2纳米复合材料的抗菌活性进行了定性和定量研究。实验过程中使用了两种细菌：大肠杆菌 (DH 5 α) 和巨大芽孢杆菌 (QMB1551)。观察并目视证明良好的抑制结果。大肠杆菌细菌活性的定量检查是通过根据在营养琼脂平板上形成菌落的活细胞数量计算的存活率来估计的。说明并讨论了抗菌效率和抑制机制。
A sol-gel chemistry approach was used to fabricate nanoparticles of TiO2 in its anatase form. The particle size is shown to be sensitive to the use of HClO4 or HNO3 as acid catalyst. The gold-capped TiO2 nanocomposites were processed by the reduction of gold on the surface of the TiO2 nanoparticles via a chemical reduction or a photoreduction method. Different percentages of vanadium-doped TiO2 nanoparticles, which extended the TiO2 absorption wavelength from the ultraviolet to the visible region, were successfully prepared. The synthesized nanocomposites have a size of about 12-18 nm and an anatase phase as characterized by XRD, TEM, AFM, and UV-vis spectroscopy. The TiO2 nanocomposite coatings have been applied on glass slide substrates. The antibacterial activity of TiO2 nanocomposites was investigated qualitatively and quantitatively. Two types of bacteria, Escherichia coli (DH 5 alpha) and Bacillus megaterium (QM B1551), were used during the experiments. Good inhibition results were observed and demonstrated visually. The quantitative examination of bacterial activity for E. coli was estimated by the survival ratio as calculated from the number of viable cells, which form colonies on the nutrient agar plates. The antimicrobial efficiency and inhibition mechanisms are illustrated and discussed.