Retarding oxidation of copper nanoparticles without electrical isolation and the size dependence of work function.
Retarding oxidation of copper nanoparticles without electrical isolation and the size dependence of work function.
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DOI：
10.1038/s41467-017-01735-6
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发表时间：
2017-12-01
影响因子：
16.6
通讯作者：
Hatton RA
中科院分区：
文献类型：
--
作者：
Dabera GDMR;Walker M;Sanchez AM;Pereira HJ;Beanland R;Hatton RA
铜纳米粒子（cups）作为一种低成本的替代金和银的类似物在许多应用中都很有吸引力，尽管由于它们在空气中更容易氧化，它们的潜力几乎没有被探索。在这里，我们展示了意想不到的结果，研究了CuNPs的空气稳定性与硫酸盐盖层配体结构之间的关系；在筛选的8种不同的配体中，具有最短烷基链、- (CH2)2 -和亲水羧酸端基的配体在空气中延缓氧化的效果最好。我们还表明，碳纳米管不会像以前报道的那样被硫醇溶液蚀刻，并解决了小支撑金属颗粒的功函数如何随粒径变化的重要基本问题。总之，这些发现为在新兴的电子应用中更大程度地利用cunp奠定了基础。铜纳米颗粒在空气中容易氧化，这限制了它们的应用。在这里，作者揭示了铜纳米颗粒的稳定性与其钝化配体的结构之间的相关性，发现短链硫醇比长链硫醇更有效地延缓氧化。
Copper nanoparticles (CuNPs) are attractive as a low-cost alternative to their gold and silver analogues for numerous applications, although their potential has hardly been explored due to their higher susceptibility to oxidation in air. Here we show the unexpected findings of an investigation into the correlation between the air-stability of CuNPs and the structure of the thiolate capping ligand; of the eight different ligands screened, those with the shortest alkyl chain, –(CH2)2–, and a hydrophilic carboxylic acid end group are found to be the most effective at retarding oxidation in air. We also show that CuNPs are not etched by thiol solutions as previously reported, and address the important fundamental question of how the work function of small supported metal particles scales with particle size. Together these findings set the stage for greater utility of CuNPs for emerging electronic applications. Copper nanoparticles are susceptible to oxidation in air, which limits their applications. Here, the authors reveal correlations between the stability of a Cu nanoparticle and the structure of its passivating ligand, finding that short chain thiols are surprisingly more effective at retarding oxidation than longer chain ones.
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