Resistive Switching of Sub-10 nm TiO2 Nanoparticle Self-Assembled Monolayers

Schmidt, Dirk Oliver; Raab, Nicolas; Noyong, Michael; Santhanam, Venugopal; Dittmann, Ralf W.; Simon, Ulrich

doi:10.3390/nano7110370

Cited by 15 publications

(10 citation statements)

References 43 publications

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“…Nanoparticle (NP) assemblies are formidable materials that can solve a variety of technological problems, such as overcoming speed and bandwidth limitations of modern electronic devices [ 1 , 2 ], surpassing current limits of solar energy harvesting devices [ 3 ], retrieving waste heat energy from thermal engines [ 4 ], preparing cloaking materials [ 5 ], or flat lenses construction [ 6 ]. What makes NP assemblies attractive for such wide range of applications are collective phenomena observed when nanocrystals are brought close together.…”

Section: Introductionmentioning

confidence: 99%

Modifying Thermal Switchability of Liquid Crystalline Nanoparticles by Alkyl Ligands Variation

et al. 2018

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By coating plasmonic nanoparticles (NPs) with thermally responsive liquid crystals (LCs) it is possible to prepare reversibly reconfigurable plasmonic nanomaterials with prospective applications in optoelectronic devices. However, simple and versatile methods to precisely tailor properties of liquid-crystalline nanoparticles (LC NPs) are still required. Here, we report a new method for tuning structural properties of assemblies of nanoparticles grafted with a mixture of promesogenic and alkyl thiols, by varying design of the latter. As a model system, we used Ag and Au nanoparticles that were coated with three-ring promesogenic molecules and dodecanethiol ligand. These LC NPs self-assemble into switchable lamellar (Ag NPs) or tetragonal (Au NPs) aggregates, as determined with small angle X-ray diffraction and transmission electron microscopy. Reconfigurable assemblies of Au NPs with different unit cell symmetry (orthorombic) are formed if hexadecanethiol and 1H,1H,2H,2H-perfluorodecanethiol were used in the place of dodecanethiol; in the case of Ag NPs the use of 11-hydroxyundecanethiol promotes formation of a lamellar structure as in the reference system, although with substantially broader range of thermal stability (140 vs. 90 °C). Our results underline the importance of alkyl ligand functionalities in determining structural properties of liquid-crystalline nanoparticles, and, more generally, broaden the scope of synthetic tools available for tailoring properties of reversibly reconfigurable plasmonic nanomaterials.

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Section: Introductionmentioning

confidence: 99%

Modifying Thermal Switchability of Liquid Crystalline Nanoparticles by Alkyl Ligands Variation

et al. 2018

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“…Additional control over the size and shape of TiO 2 particles can be achieved by means of a solvothermal approach (Dinh et al, 2009 ). Recently, this method has been successfully applied to obtain sub-10 nm TiO 2 nanoparticles that are capable of forming self-assembled monolayers and that possess resistive switching properties (Schmidt et al, 2017 ).…”

Section: Synthesis and Fabricationmentioning

confidence: 99%

Memristive TiO2: Synthesis, Technologies, and Applications

et al. 2020

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Titanium dioxide (TiO 2 ) is one of the most widely used materials in resistive switching applications, including random-access memory, neuromorphic computing, biohybrid interfaces, and sensors. Most of these applications are still at an early stage of development and have technological challenges and a lack of fundamental comprehension. Furthermore, the functional memristive properties of TiO 2 thin films are heavily dependent on their processing methods, including the synthesis, fabrication, and post-fabrication treatment. Here, we outline and summarize the key milestone achievements, recent advances, and challenges related to the synthesis, technology, and applications of memristive TiO 2 . Following a brief introduction, we provide an overview of the major areas of application of TiO 2 -based memristive devices and discuss their synthesis, fabrication, and post-fabrication processing, as well as their functional properties.

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“…Measurements of the electrical conductivity of individual nanometer-scaled particles in a highly flexible manner can be obtained by using a nanorobotics setup in a scanning electron microscope (SEM), which has been successfully applied to different classes of materials and morphologies [30,31,32,33]. By using this setup, we recently performed local electrical transport measurements on single Fe-, Ti-doped and Ru-, Ti-doped LNMO spinel crystals and demonstrated a change in the electrical conductivity depending on the dopant, which was consistent with IS measurements on pressed pellets of the corresponding materials [34].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical and Electronic Charge Transport Properties of Ni-Doped LiMn2O4 Spinel Obtained from Polyol-Mediated Synthesis

et al. 2018

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LiNi0.5Mn1.5O4 (LNMO) spinel has been extensively investigated as one of the most promising high-voltage cathode candidates for lithium-ion batteries. The electrochemical performance of LNMO, especially its rate performance, seems to be governed by its crystallographic structure, which is strongly influenced by the preparation methods. Conventionally, LNMO materials are prepared via solid-state reactions, which typically lead to microscaled particles with only limited control over the particle size and morphology. In this work, we prepared Ni-doped LiMn2O4 (LMO) spinel via the polyol method. The cycling stability and rate capability of the synthesized material are found to be comparable to the ones reported in literature. Furthermore, its electronic charge transport properties were investigated by local electrical transport measurements on individual particles by means of a nanorobotics setup in a scanning electron microscope, as well as by performing DFT calculations. We found that the scarcity of Mn3+ in the LNMO leads to a significant decrease in electronic conductivity as compared to undoped LMO, which had no obvious effect on the rate capability of the two materials. Our results suggest that the rate capability of LNMO and LMO materials is not limited by the electronic conductivity of the fully lithiated materials.

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Resistive Switching of Sub-10 nm TiO2 Nanoparticle Self-Assembled Monolayers

Cited by 15 publications

References 43 publications

Modifying Thermal Switchability of Liquid Crystalline Nanoparticles by Alkyl Ligands Variation

Modifying Thermal Switchability of Liquid Crystalline Nanoparticles by Alkyl Ligands Variation

Memristive TiO2: Synthesis, Technologies, and Applications

Electrochemical and Electronic Charge Transport Properties of Ni-Doped LiMn2O4 Spinel Obtained from Polyol-Mediated Synthesis

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