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首页> 外文期刊>Crystal growth & design >Impact of Temperature on the Fusion Growth of Bimetallic Au-Pt Nanoparticles from Each Nanocluster Conjugated with a Thermoresponsive Polymer
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Impact of Temperature on the Fusion Growth of Bimetallic Au-Pt Nanoparticles from Each Nanocluster Conjugated with a Thermoresponsive Polymer

机译：温度对来自热响应性聚合物缀合的每种纳米光刻的二氧化硅Au-Pt纳米粒子融合生长的影响

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摘要

Fusion growth from each nanocluster applying the random coil-globule transition of a thermoresponsive polymer was explored for alloy nanoparticle (NP) formation for the first time. The fusion growth of bimetallic Au-Pt alloy NPs was examined at 100, 150, and 200 degrees C via the structural collapse caused by the transition of a thermoresponsive polymer, poly(N-isopropylacrylamide). A significant temperature dependence was revealed in the formation path, even in the narrow range of reaction temperatures studied here. Structural investigations for the products were performed using transmission electron microscopy, energy-dispersive X-ray spectrometry, elemental mapping, X-ray absorption fine structure, and X-ray diffraction. At 100 degrees C, Au NPs slightly alloyed with Pt atoms rather than form neat Au NPs. The element ratio was determined to be Au:Pt = 12:1 or less of Pt atoms. Small Pt particles coated the surface of the central NPs. A nonmetallic component of Pt atoms was mainly detected in the product solution on the basis of the number of unoccupied Pt 5d orbitals. Aggregates comprising small particles several nanometers in size and void parts were generated at 150 degrees C. All of the characterization results indicate that the hydrothermal condition at 200 degrees C led to the production of Au-Pt alloy NPs having a solid-solution-type structure. The reaction path of the fusion growth of the bimetallic NPs is discussed on the basis of the effect of the temperature applied during the reaction.
机译：从每种纳米光栅施用热料聚合物的随机线圈球转变的融合增长是第一次用于合金纳米颗粒（NP）的形成。通过热响应聚合物的转变，聚合物（N-异丙基丙烯酰胺）引起的结构塌陷，在100,150和200摄氏度下检查二氧化硅AU-PT合金NPS的融合生长。即使在这里研究的反应温度范围内，在形成路径中揭示了显着的温度依赖性。使用透射电子显微镜，能量分散X射线光谱法，元素映射，X射线吸收细结构和X射线衍射进行制备产品的结构研究。在100摄氏度下，Au nps略微合金合金，而不是形成整齐的au nps。将元素比确定为au：pt = 12：1或更低的Pt原子。小Pt颗粒涂覆中央NPS的表面。 Pt原子的非金属组分主要在产品溶液中基于未占用的Pt 5d轨道的数量检测。包含小颗粒的聚集体在150℃下产生几纳米和空隙部件。所有表征结果表明，200摄氏度的水热条件导致具有固溶式结构的Au-Pt合金NPS的水热条件。基于在反应期间施加的温度的影响，讨论了双金属NP的融合生长的反应路径。

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  • 来源
    《Crystal growth & design》 |2019年第11期|共8页
  • 作者

    Morita Takeshi; Suzuki Takuya; Itoh Yoshimi; Konishi Takehisa; Haneishi Chikara; Sonoda Natsumi; Itoh Tsutomu; Masu Hyuma; Okajima Toshihiro; Setoyama Hiroyuki; Uehara Nobuo;

  • 作者单位

    Chiba Univ Grad Sch Sci Dept Chem Chiba Chiba 2638522 Japan;

    Chiba Univ Grad Sch Sci Dept Chem Chiba Chiba 2638522 Japan;

    Chiba Univ Grad Sch Sci Dept Chem Chiba Chiba 2638522 Japan;

    Chiba Univ Grad Sch Sci Dept Chem Chiba Chiba 2638522 Japan;

    Utsunomiya Univ Grad Sch Engn Dept Mat &

    Environm Chem Utsunomiya Tochigi 3218585 Japan;

    Utsunomiya Univ Grad Sch Engn Dept Mat &

    Environm Chem Utsunomiya Tochigi 3218585 Japan;

    Chiba Univ Ctr Analyt Instrumentat Chiba Chiba 2638522 Japan;

    Chiba Univ Ctr Analyt Instrumentat Chiba Chiba 2638522 Japan;

    Kyushu Synchrotron Light Res Ctr SAGA Light Source Tosu Saga 8410005 Japan;

    Kyushu Synchrotron Light Res Ctr SAGA Light Source Tosu Saga 8410005 Japan;

    Utsunomiya Univ Grad Sch Engn Dept Mat &

    Environm Chem Utsunomiya Tochigi 3218585 Japan;

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