A “green methodology” approach to the synthesis of HfO2 nanoparticles

Quintero-García, J.S.; Puente-Urbina, Bertha; Garcı́a-Cerda, L.A.; Rodríguez‐Fernández, Oliverio; Mendoza‐Mendoza, Esmeralda

doi:10.1016/j.matlet.2015.07.014

Cited by 21 publications

(10 citation statements)

References 20 publications

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“…The Raman spectra of hafnia-containing catalysts are presented in Figure 8.a-c. The spectrum of fresh hafnia represents a typical spectrum observed for monoclinic hafnia [45,46]. After vanadia impregnation, a new band appears at 992 cm -1 , which is the same than that observed for zirconia.…”

supporting

confidence: 60%

Activity, selectivity, and stability of vanadium catalysts in formaldehyde production from emissionsof volatile organic compounds

Laitinen

Ojala

Cousin

et al. 2020

Journal of Industrial and Engineering Chemistry

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supporting

confidence: 60%

Activity, selectivity, and stability of vanadium catalysts in formaldehyde production from emissionsof volatile organic compounds

Laitinen

Ojala

Cousin

et al. 2020

Journal of Industrial and Engineering Chemistry

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“…Since APCs are tiny in size and cannot be easily observed in oxygen anion-dominated resistive switching devices, the Pt/HfO x / ITO device was programmed to highly conductive states with potentially stronger conductive filaments for the ease of experimental observation. [46] After the device was electroformed with a high compliance current of 0.01 A ( Figure S7, Supporting Information), both partially and fully electroformed conductive nano filaments are observed. [46] After the device was electroformed with a high compliance current of 0.01 A ( Figure S7, Supporting Information), both partially and fully electroformed conductive nano filaments are observed.…”

Section: Resultsmentioning

confidence: 99%

Controllable and Stable Quantized Conductance States in a Pt/HfO_x/ITO Memristor

Xue

Liu

et al. 2019

Adv Elect Materials

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computation-in-memory paradigm with new electronic devices when handling data-intensive tasks. [1,2] One important attempt is the recently well explored memristor, [3][4][5] in which the nonlinear dynamics of the device allows on demand modulation of the conductance for direct logic operation while the capability of memorizing the new conductance state enables data storage at exactly the same physical location. [6,7] Eliminating the frequent data fetching and movement between the separated memory and processing units, memristors with the simplicity of a resistor structure can lead to extremely compact crossbar array for highly efficient hardware systems. [8,9] In particular, the elaborate evolution of the conductive filament via local ion motion and electrochemistry including foreign cations (such as Ag + and Cu 2+ injected from electrochemically active metal electrodes) and native oxygen anions or vacancies (O 2− or V O ) are widely used to construct atomic point contacts (APCs) with quantized conductance features. [10][11][12][13][14] The stepwise development of device conductance in the unit of conductance quantum G 0 = 2e 2 /h = 77.5 µS (where e is the elemental charge of electrons and h is the Planck's constant), [10] associated with the continuous yet precise atomic Quantum-level manipulation of atomic configuration offers a excellent platform for the construction of exotic nanostructures that exhibit unusual solid-state physics and electronic properties. One particular example is the memristor, in which the elaborate evolution of atomic point contact via local ionic processes and consequent stepwise device conductance quantization enable bottom-up design of in-memory computing with greatly increased data storage density and more efficient multi-value logic algorithm. In-depth understanding on the physics of atomic reconfiguration is achieved through comprehensive consideration of the thermodynamics and kinetics of nanoionics in memristors, based on which a general protocol of constructing atomic point contact structure with desired quantized conductance is established. Through energy-driven single-atom level oxygen manipulation in the reset process of a Pt/HfO x /ITO structure, up to 32 consecutive quantized conductance states with an interval of half conductance quantum that can be sustained for over 7000 s and tuned 500 times are demonstrated for the first time, not only allowing the physical implementation of ternary logic-inmemory functions, but also providing a universal methodology for building next-generation quantum electronic devices.

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“…developed a method combining mechanically assisted metathesis and molten salts (LiCl/KCl) for the synthesis of c-HfO 2 at 380 °C. This method produced c-HfO 2 nanoparticles with m-HfO 2 impurities 25 . Thus, it remains imperative to develop a novel facile route to prepare cubic- and tetragonal-phase HfO 2 nanostructures at low temperatures and to study the unique shapes and size-dependent properties of these nanostructures, which may permit novel applications.…”

Section: Introductionmentioning

confidence: 99%

A novel approach to low-temperature synthesis of cubic HfO2 nanostructures and their cytotoxicity

Kumar

George

Abrahamse

et al. 2017

Sci Rep

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The development of a strategy to stabilise the cubic phase of HfO2 at lower temperatures is necessary for the emergence of unique properties that are not realised in the thermodynamically stable monoclinic phase. A very high temperature (>2600 °C) is required to produce the cubic phase of HfO2, whereas the monoclinic phase is stable at low temperature. Here, a novel rapid synthesis strategy was designed to develop highly crystalline, pure cubic-phase HfO2 nanoparticles (size <10 nm) using microwave irradiation. Furthermore, the as-prepared nanoparticles were converted to different morphologies (spherical nanoparticles and nanoplates) without compromising the cubic phase by employing a post-hydrothermal treatment in the presence of surface modifiers. The cytotoxicities and proliferative profiles of the synthesised cubic HfO2 nanostructures were investigated over the MCF-7 breast cancer cell line, along with caspase-3/7 activities. The low-temperature phase stabilisation was significantly attributed to surface imperfections (defects and deformations) induced in the crystal lattice by the desirable presence of Na2S·xH2O and NaOH. Our work provides unprecedented insight into the stabilisation of nanoscale cubic-phase HfO2 in ambient environments; the method could be extended to other challenging phases of nanomaterials.

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A “green methodology” approach to the synthesis of HfO2 nanoparticles

Cited by 21 publications

References 20 publications

Activity, selectivity, and stability of vanadium catalysts in formaldehyde production from emissionsof volatile organic compounds

Activity, selectivity, and stability of vanadium catalysts in formaldehyde production from emissionsof volatile organic compounds

Controllable and Stable Quantized Conductance States in a Pt/HfO_x/ITO Memristor

A novel approach to low-temperature synthesis of cubic HfO2 nanostructures and their cytotoxicity

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A “green methodology” approach to the synthesis of HfO2 nanoparticles

Cited by 21 publications

References 20 publications

Activity, selectivity, and stability of vanadium catalysts in formaldehyde production from emissionsof volatile organic compounds

Activity, selectivity, and stability of vanadium catalysts in formaldehyde production from emissionsof volatile organic compounds

Controllable and Stable Quantized Conductance States in a Pt/HfOx/ITO Memristor

A novel approach to low-temperature synthesis of cubic HfO2 nanostructures and their cytotoxicity

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Controllable and Stable Quantized Conductance States in a Pt/HfO_x/ITO Memristor