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首页> 外文期刊>Journal of nanomaterials >New Thiophene Monolayer-Protected Copper Nanoparticles: Synthesis and Chemical-Physical Characterization
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New Thiophene Monolayer-Protected Copper Nanoparticles: Synthesis and Chemical-Physical Characterization

机译：新型噻吩单层保护的铜纳米颗粒：合成和化学物理表征

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For the first time copper 3-(6-mercaptohexyl)thiophene-protected nanoparticles (Cu T6SH) have been synthesized by a one-phase system, utilizing anNaBH4/LiCl mixture in diglyme as the reducing reagent and avoiding water medium dissolving copper salts. The prepared nanoclusters, characterized by transmission electron microscopy (TEM), have shown a constant spherical morphology with a size dimension of 5-6 nm in diameter. After their synthesis, no morphological evolution and irreversible aggregation process has been observed after a storage inCH2Cl2at low temperature for a period up to six months long. Cu T6SH nanoparticles have been investigated by UV-Visible (UV-Vis) and Fourier transmission infrared (FTIR) spectroscopes to characterize the alkylthiophenes monolayer conformations and the particles optoelectronic properties. The UV-Vis reveals the lack of the surface plasmonic band, previously observed in Cu-nanosized clusters at about 556–570 nm, and shows a wide-band centered at 293 nm, probably due to the high-conformational surface ordering of thiophene rings on the Cu core. The results highlight the importance of the modifications ported to the well-known one-phase synthetic reactions to obtain a clear lack, even after a storage of six months, of any irreversible aggregation that has always characterized chain thiophene-protected metallic nanoparticles.
机译：首次通过单相系统合成了3-（6-巯基己基）噻吩铜保护的纳米粒子（Cu T6SH），利用二甘醇二甲醚中的NaBH4 / LiCl混合物作为还原剂，避免了水介质溶解铜盐。制备的纳米团簇，通过透射电子显微镜（TEM）表征，显示出恒定的球形形态，其直径尺寸为5-6 nm。它们合成后，在低温下在CH2Cl2中储存长达六个月的时间后，未观察到任何形态演变和不可逆的聚集过程。 Cu T6SH纳米粒子已通过紫外可见（UV-Vis）和傅立叶透射红外（FTIR）光谱仪进行了研究，以表征烷基噻吩单层构象和粒子的光电性能。 UV-Vis揭示了先前在556-570 nm的铜纳米簇中观察不到的表面等离子体带，并显示了一个以293 nm为中心的宽带，这可能是由于噻吩环的高构象表面有序在铜芯上。结果强调了进行众所周知的单相合成反应的修饰的重要性，即使在储存六个月后，也显然缺乏任何一直以链噻吩保护的金属纳米颗粒为特征的不可逆聚集。

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