Gavara-Edo Miguel, Córdoba Rosa, Valverde-Muñoz Francisco Javier, Herrero-Martín Javier, Real José Antonio, Coronado Eugenio
Institute of Molecular Science, University of Valencia, Catedrático José Beltrán 2, Paterna, 46980, Spain.
CELLS-ALBA Synchrotron, Carrer de la Llum 2-26, Cerdanyola del Vallès, 08290, Spain.
Adv Mater. 2022 Aug;34(33):e2202551. doi: 10.1002/adma.202202551. Epub 2022 Jul 10.
Hybrid devices based on spin-crossover (SCO)/2D heterostructures grant a highly sensitive platform to detect the spin transition in the molecular SCO component and tune the properties of the 2D material. However, the fragility of the SCO materials upon thermal treatment, light irradiation, or contact with surfaces and the methodologies used for their processing have limited their applicability. Here, an easily processable and robust SCO/2D hybrid device with outstanding performance based on the sublimable SCO [Fe(Pyrz) ] molecule deposited over chemical vapor deposition (CVD) graphene is reported, which is fully compatible with electronics industry protocols. Thus, a novel methodology based on growing an elusive polymorph of [Fe(Pyrz) ] (tetragonal phase) over graphene is developed that allows a fast and effective light-induced spin transition in the devices (≈50% yield in 5 min) to be detected electrically. Such performance can be enhanced even more when a flexible polymeric layer of poly(methyl methacrylate) is inserted in between the two active components in a contactless configuration, reaching a ≈100% yield in 5 min.
基于自旋交叉（SCO）/二维异质结构的混合器件为检测分子SCO组件中的自旋转变以及调节二维材料的性能提供了一个高灵敏度平台。然而，SCO材料在热处理、光照或与表面接触时的脆弱性以及用于其加工的方法限制了它们的适用性。在此，报道了一种基于化学气相沉积（CVD）石墨烯上沉积的可升华SCO [Fe(Pyrz) ]分子的易于加工且性能出色的坚固SCO/二维混合器件，它与电子工业协议完全兼容。因此，开发了一种基于在石墨烯上生长难以捉摸的[Fe(Pyrz) ]多晶型物（四方相）的新方法，该方法能够通过电学方式检测器件中快速有效的光致自旋转变（5分钟内产率约为50%）。当在两个活性组件之间以非接触配置插入一层柔性聚甲基丙烯酸甲酯聚合物层时，这种性能甚至可以进一步提高，在5分钟内产率达到约100%。
