Kichijo Ryota, Miyajima Naoya, Ogawa Daisuke, Sugimori Hirokazu, Wang Ke-Hsuan, Imura Yoshiro, Kawai Takeshi
Faculty of Engineering, Tokyo University of Science 6-3-1 Niijuku, Katsushika-ku 125-8585 Tokyo Japan
Tokyo Metropolitan Industrial Technology Research Institute (TIRI) 2-4-10 Aomi, Koto-ku 135-0064 Tokyo Japan.
RSC Adv. 2022 Oct 11;12(45):28937-28943. doi: 10.1039/d2ra05496e.
Metal nanowires (NWs) with a diameter of a few nanometers have attracted considerable attention as a promising one-dimensional nanomaterial due to their inherent flexibility and conductive properties and their weak plasmon absorption in the visible region. In a previous paper, we reported the synthesis of ultrathin 1.8 nm-diameter Au NWs using toluene-solubilized aqueous solutions of a long-chain amidoamine derivative (C18AA). This study investigates the effect of different organic solvents solubilized in C18AA aqueous solutions on the morphology of the Au products and demonstrates that solubilizing methylcyclohexane yields thick 2.7 nm-diameter Au NWs and 3.3 nm-diameter Au-Ag alloy NWs. Further, the surface-enhanced Raman scattering sensitivity of ultrathin Au NWs, thick Au NWs, and thick Au-Ag alloy NWs were assessed using 4-mercaptopyridine and found that their enhancement factors are 10-10 and the order is Au-Ag NWs > thick Au NWs > ultrathin Au NWs.
直径为几纳米的金属纳米线（NWs）作为一种有前途的一维纳米材料，因其固有的柔韧性、导电性能以及在可见光区域较弱的等离子体吸收而备受关注。在之前的一篇论文中，我们报道了使用长链酰胺胺衍生物（C18AA）的甲苯增溶水溶液合成直径为1.8 nm的超薄金纳米线。本研究考察了溶解在C18AA水溶液中的不同有机溶剂对金产物形态的影响，并证明增溶甲基环己烷可生成直径为2.7 nm的粗金纳米线和直径为3.3 nm的金 - 银合金纳米线。此外，使用4 - 巯基吡啶评估了超薄金纳米线、粗金纳米线和粗金 - 银合金纳米线的表面增强拉曼散射灵敏度，发现它们的增强因子为10 - 10，且顺序为金 - 银纳米线＞粗金纳米线＞超薄金纳米线。
