摘要
过去研究表明，当金属纳米粒子被有机配体修饰形成界面共轭的“金属-配体”共价键时，会出现特殊的粒子内电子离域现象，然而对于不同金属对此现象的影响却缺少系统研究．本文介绍了合成了乙基苯乙炔修饰的d区元素（包括4d的钌、铑和钯，5d的铱、铂和金纳米粒子的方法，并通过对比研究其光电性质，阐明了金属元素d电子对其粒子内电子离域现象的影响．博里叶转换红外光谱和光致发光光谱测量结果均表明，在同一周期的金属元素中，随着d电子数的增加，粒子内电子离域现象逐渐增强．然而钯却表现异常，这可能与其异常低的电子亲和能相关．
Intraparticle charge delocalization occurs when metal nanoparticles are functionalized with organic capping ligands through conjugated rnetal-ligand interfacial bonds. In this study, metal nanoparticles of 5d metals （Ir, Pt, and Au） and 4d metals （Ru, Rh, and Pd） were prepared and capped with ethynylphenylacetylene and the impacts of the number of metal d electrons on the nanoparticle optoelectronic properties were examined. Both FTIR and photoluminescence measurements indicate that intraparticle charge delocalization was en- hanced with the increase of the number of d electrons in the same period with palladium being an exception.
作者
彭益
Eduardo Y.Hirata
潘万章
陈丽梅
吕家恩
陈少伟
Yi Peng;EduardoY.Hirata;WanzhangPan;Limei Chen;Jia En Lu;Shaowei Chen(Department of Chemistry and Biochemistry,University of California,Santa Cruz,California 95054,US)
基金
supported,in part,by the National Science Foundation(DMR-1409396 and CHE-1710408)
carried out at the National Center for Electron Microscopy and Molecular Foundry of Lawrence Berkeley National Laboratory,which is supported by the US Department of Energy
关键词
纳米颗粒
d电子
炔基
界面键
粒子内电子离域
Nanoparticle
d Electron
Acetylene
Interracial bond
Intraparticle charge delocalization
