诸如MoS 2之类的层状过渡金属二硫化碳(TMD)由于其独特的物理和化学特性而作为二维材料引起了人们的极大兴趣。单层或多层TMD纳米片可以通过有机锂化学或电化学通过常规的Li嵌入方法获得。然而,这些方法由于低产率,混合相以及纳米片内部的许多缺陷而受到阻碍。在这里,我们开发了一种新颖的一般策略,即使用AMS 2制备单层TMD纳米片(A = Li,Na,K; M = Mo,Nb,Ta,Ti)晶体是理想的前体。这些化合物的晶体结构确保了坚固的S–M–S层和它们之间的充满碱金属原子,通过化学剥落,可高产量地生产高质量的单层纳米片。出乎意料的是,由LiMoS 2晶体获得的MoS 2纳米片表现出高质量的1T'相,而广泛使用的正丁基锂方法只能制备出具有大量缺陷的相混合(2H,1T,1T')纳米片。所制备的1T'MoS 2纳米片表现出显着的电导率(618 S cm -1),远高于MoS 2纳米片(35.4
Lithium intercalation-deintercalation reactions using matrixes with the sulvanite structure: Dimensionality lowering of the host-structure
作者:A. Golub、N. Allali、D. Guyomard、M. Danot
DOI:10.1016/0025-5408(95)00083-6
日期:1995.8
Abstract Reaction of butyllithium with 3-D Cu 3 NbS 4 leads to redox extraction of copper and formation of 2-D LiNbS 2 . Action of iodine on the intercalated material allows NbS 2 (2H variety) to be obtained. For both Cu 3 NbS 4 and Cu 3 VS 4 , the electrochemical study shows an irreversible multi-phase transformation of the starting material during the first intercalation-deintercalation cycle. Cyclability
作者:Pamela A. Salyer、Marten G. Barker、Alexander J. Blake、Duncan H. Gregory、Claire Wilson
DOI:10.1107/s0108270102021844
日期:2003.1.15
Lithium niobium disulfide, Li0.63NbS2, has been prepared by a metathesis reaction between physically separated solid reactants, i.e. separated reactant metathesis (SRM). Single-crystal data were collected at reduced temperature [150 (2) K], yielding a refined Li content of y=0.63 (6). The Li content in the crystalline samples was also determined analytically by flame photometry. The compound crystallizes in hexagonal space group P6(3)/mmc (No. 194), with Li+ ions situated in octahedral sites between NbS2 layers.
Electrical and electrochemical properties of niobium disulphide
作者:J. Molenda、T. Bak、J. Marzec
DOI:10.1002/pssa.2211560119
日期:1996.7.16
The electrical conductivity and thermoelectric power measurements of NbS2 pure and electrochemically doped with lithium, LixNbS2, were done as a function of temperature (77 to 300 K). The high absolute values of conductivity and their dependence on temperature together with low absolute values of thermoelectric power and their linear increase with temperature indicate metallic properties of niobium disulphide. In case of LixNbS2 the obtained values of electrical conductivity are significantly lower as compared with the starting NbS2. The temperature dependence of the thermoelectric power of intercalated niobium disulphide also indicates that metallic properties get worse as the concentration of lithium increases. The modification of the electronic structure of NbS2 due to lithium intercalation was proposed. The character of the discharge curves in the electrochemical Li/Li+/LixNbS2 systems was correlated with the electronic properties of niobium disulphide.
Intercalation compounds of alkali metals with niobium and tantalum dichalcogenides