Preparation of MoS2-Polyvinylpyrrolidone Nanocomposites for Flexible Nonvolatile Rewritable Memory Devices with Reduced Graphene Oxide Electrodes

A facile method for exfoliation and dispersion of molybdenum disulfide (MoS2) with the aid of polyvinylpyrrolidone (PVP) is proposed. The resultant PVP‐coated MoS2 nanosheets, i.e., MoS2‐PVP nanocomposites, are well dispersed in the low‐boiling ethanol solvent, facilitating their thin film preparati...

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Bibliographic Details
Published in:Small (Weinheim an der Bergstrasse, Germany) Germany), 2012-11, Vol.8 (22), p.3517-3522
Main Authors: Liu, Juqing, Zeng, Zhiyuan, Cao, Xiehong, Lu, Gang, Wang, Lian-Hui, Fan, Qu-Li, Huang, Wei, Zhang, Hua
Format: Article
Language:English
Subjects:
flash
memory device
MoS2
Nanocomposites
Nanotechnology
R&D
reduced graphene oxide
Research & development
Studies
two-dimensional nanomaterial
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Summary:A facile method for exfoliation and dispersion of molybdenum disulfide (MoS2) with the aid of polyvinylpyrrolidone (PVP) is proposed. The resultant PVP‐coated MoS2 nanosheets, i.e., MoS2‐PVP nanocomposites, are well dispersed in the low‐boiling ethanol solvent, facilitating their thin film preparation and the device fabrication by solution processing technique. As a proof of concept, a flexible memory diode with the configuration of reduced graphene oxide (rGO)/MoS2‐PVP/Al exhibited a typical bistable electrical switching and nonvolatile rewritable memory effect with the function of flash. These experimental results prove that the electrical transition is due to the charge trapping and detrapping behavior of MoS2 in the PVP dielectric material. This study paves a way of employing two‐dimensional nanomaterials as both functional materials and conducting electrodes for the future flexible data storage. Few‐layer molybdenum disulfide (MoS2) nanosheets dispersed in low‐boiling ethanol solvent are prepared via the polyvinylpyrrolidone (PVP) enhanced exfoliation. The obtained MoS2‐PVP nanocomposites sandwiched between reduced graphene oxide film and Al electrode exhibite the electrically bistable behavior with the function of nonvolatile rewritable memory. This study paves a way of employing two‐dimensional nanomaterials as both functional materials and conducting electrodes for the future flexible data storage.
ISSN:1613-6810
1613-6829
DOI:10.1002/smll.201200999