Fabrication of high-demensional nano-structures by laser ablation in liquids

通过在液体中激光烧蚀制造高维纳米结构

• 批准号: 16510088
• 负责人: TSUJI Takeshi
• 金额: $ 2.56万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16510088/
• 关键词: nanoparticles; metal; laser; laser ablation in liquids; structural control; prism; rod; 液相レーザーアブレーション; 銀コロイド; ナノワイヤー; ナノシート; レーザーアブレーション; 液相

Laser irradiation onto metal nanoparticles is one of a essential technique to modify the shape of the nanoparticles. While former studies using nanoparticles obtained by chemical synthesis have shown that only size-decreased or -increased spherical nanoparticle were obtained, we revealed that nanowires were obtained by laser irradiation onto silver nanoparticles prepared by laser irradiation in pure water.In this study, the formation mechanisms of the nanowires have been explored. First, we have investigated the influence of the irradiation intensity on the shape of products, and have revealed that nanowires and sheets were produced at high irradiation intensity. This finding indicates that nanowires will be produced via fusion of silver nanoparticles. In addition, nanoprisms and nanorods were found to be produced at low laser intensity, indicating that another type of shape conversion presents.Second, we have investigated influences of ions contained as impurities on the formation of nanowires. The formation efficiency and size of wire-like particles increased with increase in the concentration of NaCl. This finding can be explained in terms of the ion-mediated self-assembly of metal nanoparticles. In addition, it was found that the formation of nanoprisms and nanorods were enhanced by addition of NaCl. This finding was explained in terms of the oxidative etching effect by chloride ions on silver nanoparticles followed by photo-reduction.In the future study, we will carry out further investigation on the formation mechanism of nanoprisms and nanorods.

激光辐照金属纳米粒子是改变纳米粒子形状的重要手段之一。虽然以前的研究表明，使用化学合成得到的纳米粒子，只有尺寸减小或增加的球形纳米粒子，我们发现，纳米线是通过激光照射到银纳米粒子制备在纯水中，在本研究中，纳米线的形成机制进行了探讨。首先，我们研究了辐射强度对产物形状的影响，并揭示了在高辐射强度下产生纳米线和片。这一发现表明，纳米线将通过银纳米粒子的融合产生。此外，在低激光强度下也可以产生纳米棱柱和纳米棒，表明存在另一种形状转换。其次，我们研究了杂质离子对纳米线形成的影响。随着NaCl浓度的增加，线状粒子的形成效率和尺寸增加。这一发现可以用离子介导的金属纳米粒子自组装来解释。此外，研究发现，加入NaCl可以促进纳米棱柱和纳米棒的形成。这一发现可以从氯离子对银纳米粒子的氧化刻蚀作用以及随后的光还原反应来解释。在未来的研究中，我们将对纳米棱柱和纳米棒的形成机理进行进一步的研究。

项目成果

Laser-induced morphology changes of silver colloids prepared by laser ablation in water. -Enhancement of anisotropic shape conversions by chloride ions-

水中激光烧蚀制备的银胶体的激光诱导形态变化。

• 发表时间: 2006
• 期刊: Journal of Photochemistry and Photobiology A (印刷中)
• 作者: Takeshi Tsuji;Yuuki Okazaki;Takanori Higuchi;Masaharu Tsuji
• 通讯作者: Masaharu Tsuji

Laser-induced Structural Conversions of Silver Nanoparticles in Pure Water

纯水中银纳米颗粒的激光诱导结构转变

• 发表时间: 2005
• 期刊: Chemistry Letters 34・4
• 作者: Takeshi Tsuji;Takanori Higuchi;Masaharu Tsuji
• 通讯作者: Masaharu Tsuji

レーザーアブレーションによる溶液中金属微粒子形成の研究

激光烧蚀溶液中金属颗粒形成的研究

• 发表时间: 2005
• 期刊: 九州大学超高圧電子顕微鏡室研究報告 第29号
• 作者: 辻 剛志;樋口貴則;辻 正治
• 通讯作者: 辻 正治

Fabrication of metal nanoparticles by using laser ablation in water

在水中使用激光烧蚀制造金属纳米粒子

• 发表时间: 2005
• 期刊: Laser Kenkyu 33(10)
• 作者: T.Tsuji;M.Tsuji
• 通讯作者: M.Tsuji

Study on the formation of metal nano-particles with laser ablation in solution

溶液中激光烧蚀形成金属纳米粒子的研究

• 发表时间: 2006
• 期刊: Annual Reports.HEVEM LAB. (Kyushu Univ.) 29
• 作者: T.Tsuji;T.Higuchi;M.Tsuji
• 通讯作者: M.Tsuji