Surface Investigation on Gd 4 M 8 (M = Zn, Ni) Single Molecule Coolers
Surface Investigation on Gd 4 M 8 (M = Zn, Ni) Single Molecule Coolers
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Gd 4 M 8 (M = Zn, Ni) 单分子冷却器的表面研究
DOI：
10.1002/adfm.201400460
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发表时间：
2014
影响因子：
19
通讯作者：
Corradini V
中科院分区：
文献类型：
--
作者：
Corradini V
在分子尺度上证明功能的保留仍然是一个重大挑战，无论是对合适的衍生物和方案的选择，以及对所采用的实验工具和方法。通过结合使用扫描探针（AFM和STM）和光谱方法（XPS，XAS和XMCD），表明Gd 4 M8衍生物（M = Zn ~（2+），Ni ~（2+））是稳定的分子单元，当沉积在金属表面时，保持了它们的电、磁和热力学性质。即在4 K时，测量了分散在Au（111）表面上的孤立Gd_4Ni_8分子的熵变ΔS= [S（6 T）-S（0 T）]超过8 R（20 J kg− 1 K −1），为在单分子水平上开发大磁热效应提供了一条可行的途径.
Proving the preservation of functionality at the molecular scale is still a major challenge, both for the choice of suitable derivatives and protocols and for the employed experimental tools and methods. By using a combined scanning probe (AFM and STM) and spectroscopic methodology (XPS, XAS and XMCD), it is shown that Gd4M8derivatives (with M = Zn2+, Ni2+) are robust molecular units which preserve their electronic, magnetic, and thermodynamic properties when deposited on a metallic surface. Namely, entropy variation ΔS= [S(6 T) –S(0 T)] exceeding 8 R (20 J kg−1K−1) at 4 K in isolated Gd4Ni8molecules dispersed on Au(111) surface is measured and a viable route to exploit large magnetocaloric effect at single molecule level is shown.