nanoelectronics applications because of their outstanding physical and chemical properties, as well as atomic-scale thickness, light weight, transparency, and flexibility. [1][2][3][4][5][6][7][8][9][10] With this material versatility and superiority, various electronic and optical device applications exploiting 2D materials have been extensively suggested and demonstrated, including transistors, [2] memory, [3] synaptic devices, [4] sensors, [5] supercapacitors, [6] and photodetectors. [7] In addition, based on their chemical functionality and unique structural properties, they can be utilized for particular materials and structures such as photocatalysts, [8] catalytic supports, [9] and membranes for gas separation. [10] Among these, 2D layered double hydroxide (LDH)-based materials can have unique morphological and chemical properties that originate from a stacked 2D nanosheet composed of a positively charged metal hydroxide layer and intercalated charge-balancing anions. [11,12] This stacked 2D nanosheet exhibited excellent charge transferability as a natural ion carrier and good material durability. [13] In particular, LDH-based films can be uniformly grown on a large-scale substrate through a simple and well-controlled hydrothermal process, regardless of the type of substrate, without requiring a high-temperature process. [14][15][16] Furthermore, in addition to the energy bandgap, the morphology of LDH materials can also be adjusted according to the type of metal cation used during the synthesis, thereby providing electrical and morphological versatility. [17][18][19] Based on these merits, they have been widely studied as functional nanomaterials for diverse electrical and chemical applications, including luminescence sources, [20] nanocomposite hydrogels, [21] catalysts, [22] energy storage, [23] anion-exchangers, [24] and chemical nanocontainers. [25] However, despite their excellent charged ion storage, charge trapping, and transfer ability, their potential in switching device applications has rarely been demonstrated as compared with other 2D materials. Recently, Yang et al. reported the bipolar resistive switching behavior of the Ag/ZnAl-LDH/Al foil junction. [26] However, the LDH in this type of junction only plays the role of a solid electrolyte material, not a switching active material.
Layered double hydroxide (LDH)‐based materials, which are 2D materials, have received considerable attention because of their structural diversity and electronic functionality. In article number 2001990, Jingon Jang, Gunuk Wang, and co‐workers have reported a new type of transparent and unipolar nonvolatile memory that is developed based on a two‐terminal Pt/ZnAl‐LDH/FTO junction, where its switching filament is formed through the self‐organized vertical stacked ZnAl‐LDH structure.
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