Nucleation-controlled hysteresis in unstrained hydrothermal 
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Clarke, Heidi; Carraway, Bill D.; Sellers, Diane G.; Braham, Erick J.; Banerjee, Sarbajit; Arróyave, Raymundo; Shamberger, Patrick J.

doi:10.1103/physrevmaterials.2.103402

Cited by 11 publications

(36 citation statements)

References 32 publications

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“…The vanadium element in VO 2 is +4 valence; thus, it is easy to be oxidized in the process of preparation and to get mixed VO 2 /V 2 O 5 products with +4 and +5 valences. In recent years, various techniques have been carried out for the growth of VO 2 with a pure phase, such as sputtering, PLD, sol–gel method, CVD, hydrothermal method and electrospinning [ 33 , 37 , 38 , 39 , 40 , 41 , 42 ]. Each method has its features and suits the growth of different structures.…”

Section: Methods For the Growth Of Vo 2 Nanostrmentioning

confidence: 99%

Recent Progress on Vanadium Dioxide Nanostructures and Devices: Fabrication, Properties, Applications and Perspectives

et al. 2021

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Vanadium dioxide (VO2) is a typical metal-insulator transition (MIT) material, which changes from room-temperature monoclinic insulating phase to high-temperature rutile metallic phase. The phase transition of VO2 is accompanied by sudden changes in conductance and optical transmittance. Due to the excellent phase transition characteristics of VO2, it has been widely studied in the applications of electric and optical devices, smart windows, sensors, actuators, etc. In this review, we provide a summary about several phases of VO2 and their corresponding structural features, the typical fabrication methods of VO2 nanostructures (e.g., thin film and low-dimensional structures (LDSs)) and the properties and related applications of VO2. In addition, the challenges and opportunities for VO2 in future studies and applications are also discussed.

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Section: Methods For the Growth Of Vo 2 Nanostrmentioning

confidence: 99%

Recent Progress on Vanadium Dioxide Nanostructures and Devices: Fabrication, Properties, Applications and Perspectives

et al. 2021

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“…Freestanding single-crystalline particles, in contrast, experience rapid transformation with little phase coexistence, possibly caused by its ability to deform easily and limited extended defects to impede domain growth . These freestanding, undoped particles likely utilize different defects to nucleate phases on heating and cooling. , It should be noted that in addition to the M1 and R phases, studies have found that an alternative monoclinic phase (M2) of space group C 2/ m can form under strainfor example, M2 is seen in both elastically clamped particles , and W-doped particles . Additionally, a triple point has been measured at the transition temperature in undoped VO 2 nanobeams, which is subject to much study …”

Section: Introductionmentioning

confidence: 99%

Toward High-Precision Control of Transformation Characteristics in VO₂ through Dopant Modulation of Hysteresis

et al. 2020

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Metal–insulator transition materials such as VO2 have garnered much attention in the field of neuromorphic devices because of their nonlinear behavior and orders of magnitude scale property changes. Of interest is the ability to control their transformation and hysteresis through dopants. However, a deep understanding of the effect of each dopant on the VO2 system remains lacking. Here, we utilize an optical technique to investigate the changes produced by substitutional tungsten and interstitial boron dopants when compared to an undoped VO2 system. Tungsten demonstrates the ability to decrease the transition temperature, reduce hysteresis, and increase the transformation width. Boron also shows small increases to the transformation width but is accompanied by a larger hysteresis and unique relaxation effects. Single-particle imaging demonstrates that broader hysteresis observed in ensemble calorimetry measurements results from variations of dopant incorporation among populations of particles. Additionally, both dopants seem to negate the size effects observed in undoped particles because of their ability to enhance or suppress point defect concentrations and thereby improve the consistency of hysteresis. Both effects are essential for utilizing VO2 in practical applications such as neuromorphic devices requiring precise control of transformation characteristics.

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“…This results in negligible substrate‐particle elastic coupling compared to VO 2 grown under high‐temperature conditions using chemical vapor deposition. [ 2,35 ]…”

Section: Methodsmentioning

confidence: 99%

“…Vanadium dioxide has a characteristic temperature‐driven metal–insulator transition (MIT) in which the material transforms from a low‐temperature insulating monoclinic (M1) phase to a high‐temperature metallic rutile (R) phase at approximately 67 °C. [ 1 ] In single crystal VO 2 particles, temperature‐driven phase transitions are nucleation‐limited, [ 2,3 ] resulting in an interphase boundary that rapidly moves through the volume of the particle and a transition that progresses to completion over a narrow temperature range. [ 2,4,5 ] Importantly, characteristic transformation temperatures of the phase transition can be modulated by adjusting the chemical equilibrium of the two phases, most commonly by incorporating chemical dopants.…”

Section: Introductionmentioning

confidence: 99%

“…[ 1 ] In single crystal VO 2 particles, temperature‐driven phase transitions are nucleation‐limited, [ 2,3 ] resulting in an interphase boundary that rapidly moves through the volume of the particle and a transition that progresses to completion over a narrow temperature range. [ 2,4,5 ] Importantly, characteristic transformation temperatures of the phase transition can be modulated by adjusting the chemical equilibrium of the two phases, most commonly by incorporating chemical dopants. [ 6–9 ] Of particular interest, doping single crystal VO 2 particles with boron has previously been shown to depress MIT temperatures while causing a dynamic relaxation effect that results in a shift in the M1 → R transformation temperature with time upon cooling to the monoclinic phase.…”

Section: Introductionmentioning

confidence: 99%

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Probing Relaxation Dynamics and Stepped Domain Switching in Boron‐Alloyed VO₂

Bradicich¹,

Clarke²,

Braham³

et al. 2021

Adv Elect Materials

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The characteristic metal–insulator phase transition (MIT) in vanadium dioxide results in nonlinear electrical transport behavior, allowing VO2 devices to imitate the complex functions of neurological behavior. Chemical doping is an established method for varying the properties of the MIT, and interstitial dopant boron has been shown to generate a unique dynamic relaxation effect in individual B‐VO2 particles. This paper describes the first demonstration of an electrically stimulated B‐VO2 proto‐device which manifests a time‐dependent critical transformation temperature and switching voltage derived from the coupling of dopant diffusion dynamics and the metal–insulator transition of VO2. During quasi‐steady current‐driven transitions, the electrical responses of B‐VO2 proto‐devices show a step‐by‐step progression through the phase transformation, evidencing domain transformations within individual particles. The dynamic relaxation effect is shown to increase the critical switching voltage by up to 41% (ΔVcrit = 0.13 V) and also to increase the resistivity of the M1 phase of B‐VO2 by 14%, imbuing a memristive response derived from intrinsic material properties. These observations demonstrate the dynamic relaxation effect in B‐VO2 proto‐devices whose electrical transport responses can be adjusted by electronic phase transitions triggered by temperature but also by time as a result of intrinsic dynamics of interstitial dopants.

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Nucleation-controlled hysteresis in unstrained hydrothermal VO2 particles

Cited by 11 publications

References 32 publications

Recent Progress on Vanadium Dioxide Nanostructures and Devices: Fabrication, Properties, Applications and Perspectives

Recent Progress on Vanadium Dioxide Nanostructures and Devices: Fabrication, Properties, Applications and Perspectives

Toward High-Precision Control of Transformation Characteristics in VO₂ through Dopant Modulation of Hysteresis

Probing Relaxation Dynamics and Stepped Domain Switching in Boron‐Alloyed VO₂

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Nucleation-controlled hysteresis in unstrained hydrothermal VO2 particles

Cited by 11 publications

References 32 publications

Recent Progress on Vanadium Dioxide Nanostructures and Devices: Fabrication, Properties, Applications and Perspectives

Recent Progress on Vanadium Dioxide Nanostructures and Devices: Fabrication, Properties, Applications and Perspectives

Toward High-Precision Control of Transformation Characteristics in VO2 through Dopant Modulation of Hysteresis

Probing Relaxation Dynamics and Stepped Domain Switching in Boron‐Alloyed VO2

Contact Info

Product

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About

Toward High-Precision Control of Transformation Characteristics in VO₂ through Dopant Modulation of Hysteresis

Probing Relaxation Dynamics and Stepped Domain Switching in Boron‐Alloyed VO₂