Guo Yabin, Chen Qiao, Nie Anmin, Yang Huan, Wang Wenbin, Su Jianwei, Wang Shuzhe, Liu Youwen, Wang Shun, Li Huiqiao, Liu Zhongyuan, Zhai Tianyou
State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering , Huazhong University of Science and Technology , Wuhan 430074 , People's Republic of China.
MOE Key Laboratory of Fundamental Physical Quantities Measurement & Hubei Key Laboratory of Gravitation and Quantum Physics, PGMF and School of Physics , Huazhong University of Science and Technology , Wuhan 430074 , People's Republic of China.
ACS Nano. 2020 Feb 25;14(2):1635-1644. doi: 10.1021/acsnano.9b06943. Epub 2020 Feb 6.
A molecule-confined two-dimensional (2D) hybrid superlattice is emerging for uncovering the chemical properties as well as distinctive physical phenomenon arising from the interface electronic states. An efficient and convenient synthetic method represents an important precondition to implementing the superlattice in terminal applications and functional devices. Herein, we develop an approach of spontaneous molecular intercalation to obtain a TaS-NH hybrid superlattice through simple solution immersion processing at room temperature. A cross-sectional high-angle annular dark field image verifies that the NH molecules intercalate into the TaS lattice, and the interlayer spacing expands approximately 1.5 times. Combining electrical transport testing and theoretical calculations, electron transfer from NH to the S-Ta-S lattice induces enhanced superconductivity and the suppression of the order of charge density waves. Moreover, electrical and Kelvin probe force microscope measurements reveal that intercalary NH molecules ensure that the superlattice has higher conductivity and a lower surface work function at room temperature. A 2D hybrid superlattice-based on-chip electrocatalytic microdevice was fabricated through molecular intercalation to directly evaluate the catalytic performance. Benefiting from electronic state regulation, the hybrid superlattice is more active. The presented intercalation method would aid in exploring efficient catalysts and discovering fundamental 2D physics.
一种分子受限的二维（2D）混合超晶格正在兴起，用于揭示由界面电子态产生的化学性质以及独特的物理现象。一种高效便捷的合成方法是在终端应用和功能器件中实现超晶格的重要前提。在此，我们开发了一种自发分子插层方法，通过在室温下简单的溶液浸泡处理来获得TaS-NH混合超晶格。横截面高角度环形暗场图像证实NH分子插入到TaS晶格中，层间距扩大了约1.5倍。结合电输运测试和理论计算，电子从NH转移到S-Ta-S晶格会诱导超导电性增强以及电荷密度波序的抑制。此外，电学和开尔文探针力显微镜测量表明，插入的NH分子确保超晶格在室温下具有更高的导电性和更低的表面功函数。通过分子插层制备了一种基于2D混合超晶格的片上电催化微器件，以直接评估催化性能。受益于电子态调控，混合超晶格更具活性。所提出的插层方法将有助于探索高效催化剂并发现基本的二维物理学。
