Polymer/Perovskite-Type Nanoparticle Multilayers with Multielectric Properties Prepared from Ligand Addition-Induced Layer-by-Layer Assembly
- Authors
- Kim, Younghoon; Kook, Kyungyun; Hwang, Sun Kak; Park, Cheolmin; Cho, Jinhan
- Issue Date
- 3월-2014
- Publisher
- AMER CHEMICAL SOC
- Keywords
- layer-by-layer assembly; multilayers; BaTiO3 nanoparticle; ferroelectric; nonvolatile memory
- Citation
- ACS NANO, v.8, no.3, pp.2419 - 2430
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS NANO
- Volume
- 8
- Number
- 3
- Start Page
- 2419
- End Page
- 2430
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/99118
- DOI
- 10.1021/nn405988d
- ISSN
- 1936-0851
- Abstract
- We introduce an adsorption mechanism for a layer-by-layer (LbL) assembly (i.e., a ligand addition-induced Lbt assembly) and demonstrate that the (polymer/perovskite nanoparticle (NP))(n) nanocomposite films based on the ligand addition LbL exhibit ferroelectric and resistive switching properties. Oleic acid (OA)-stabilized BaTiO3 NPs (OA-BTO NPs) with a size of approximately 8 nm were LbL-assembled with amine-functionalized dendrimers (NH2-dendrimers) using the high affinity between NH2 moieties and Ti ions. The ferroelectric properties of the (NH2-dendrimer/OA-BTO NP)(n) multilayers were generated by the Ti disorder in the OA-BTO NP unit cell despite the use of sub-10 nm OA-BTO NPs (i.e., OA-BTO NPs), which are near the critical size for ferroelectric properties. Additionally, the (NH2-dendrimer/OA-BTO NP)(n) multilayers sandwiched between the bottom (platinum) and top (silver or tungsten) electrodes exhibited a resistive switching memory at a relatively low operating voltage below 2 V with a switching speed of approximately 100 ns and an ON/OFF current ratio of approximately 10(4). Furthermore, the ferroelectric and resistive switching properties could be further improved by controlling the bilayer number (n). We believe that our approach can provide a basis for designing and exploiting multifunctional memory electronics based on a variety of perovskite NPs with ferroelectric properties.
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