High pressure synthesis of amorphous TiO2 nanotubes

Li, Quanjun; Liu, Ran; Wang, Tianyi; Xu, Ke; Dong, Qing; Liu, Bo; Liu, Jing; Liu, Bingbing

doi:10.1063/1.4930916

Cited by 17 publications

(10 citation statements)

References 29 publications

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“…The enhancement of transition pressure could be affected by the length of the nanowires. Although the anatase irreversibly transforms to an amorphous or other crystalline phases, the morphological feature, such as nanotube, nanowire, and porous structure, can be well maintained. − Second, the compressibility is also strongly affected by NP shape. Park et al compared the compressibility of rod-shaped anatase TiO 2 (3.5 nm × 21 nm, grow along [100]) and rice-shaped NPs (3.8 nm × 5 nm, grow along [001]) NPs (see Figure d) .…”

Section: Pressure Induced Np Atomic Structure Phase Transitionmentioning

confidence: 99%

Pressure Induced Nanoparticle Phase Behavior, Property, and Applications

et al. 2019

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Nanoparticle (NP) high pressure behavior has been extensively studied over the years. In this review, we summarize recent progress on the studies of pressure induced NP phase behavior, property, and applications. This review starts with a brief overview of high pressure characterization techniques, coupled with synchrotron X-ray scattering, Raman, fluorescence, and absorption. Then, we survey the pressure induced phase transition of NP atomic crystal structure including size dependent phase transition, amorphization, and threshold pressures using several typical NP material systems as examples. Next, we discuss the pressure induced phase transition of NP mesoscale structures including topics on pressure induced interparticle separation distance, NP coupling, and NP coalescence. Pressure induced new properties and applications in different NP systems are highlighted. Finally, outlooks with future directions are discussed.

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Section: Pressure Induced Np Atomic Structure Phase Transitionmentioning

confidence: 99%

Pressure Induced Nanoparticle Phase Behavior, Property, and Applications

et al. 2019

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“…To eliminate, or at least reduce, the controversy concerning the compressibility and transformation mechanism, we study the high-pressure behavior of bulk ZnO polycrystalline. In addition, studies have shown that high pressure is an effective method for the synthesis of new materials and a powerful approach to regulating the morphology of materials through the metastabilization of the high-pressure treatment. − Synthesis of ordered amorphous carbon clusters (OACC) with the incompressibility comparable to diamond is a typical example . In this study, the average grain size for the acquired ZnO after full decompression was confirmed to be ∼10 nm.…”

Section: Introductionmentioning

confidence: 58%

Reciprocating Compression of ZnO Probed by X-ray Diffraction: The Size Effect on Structural Properties under High Pressure

Wang

et al. 2018

Inorg. Chem.

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Zinc oxide, ZnO, an important technologically relevant binary compound, was investigated by reciprocating compress the sample in a diamond anvil cell using in situ high-pressure synchrotron X-ray diffraction at room temperature. The starting sample (∼200 nm) was compressed to 20 GPa and then decompressed to ambient condition. The quenched sample, with average grain size ∼10 nm, was recompressed to 20 GPa and then released to ambient condition. The structural stability and compressibility of the initial bulk ZnO and quenched nano ZnO were compared. Results reveal that the grain size and the fractional cell distortion have little effect on the structural stability of ZnO. The bulk modulus of the B4 (hexagonal wurtzites structure) and B1 (cubic rock salt structure) phases for bulk ZnO under hydrostatic compression were estimated as 164(3) and 201(2) GPa, respectively. Importantly, the effect of pressure in atomic positions, bond distances, and bond angles was obtained. On the basis of this information, the B4-to-B1 phase transformation was demonstrated to follow the hexagonal path rather than the tetragonal path. For the first time, the detail of the intermediate hexagonal ZnO, revealing the B4-to-B1 transition mechanism, was detected by experimental method. These findings enrich our knowledge on the diversity of the size influences on the high-pressure behaviors of materials and offer new insights into the mechanism of the B4-to-B1 phase transition that is commonly observed in many other wurzite semiconductor compounds.

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“…[ 15 ] Coupling between planar and nonplanar modes in a CNT resonator resulted in a whirling motion, which can be used as an amplitude limiting mechanism in self‐resonating NEMS oscillators. [ 475,476 ]…”

Section: Fundamental Concepts Of Nano/micromechanical Resonatorsmentioning

confidence: 99%

A Comprehensive Categorization of Micro/Nanomechanical Resonators and Their Practical Applications from an Engineering Perspective: A Review

Ghaemi

Nikoobin

Ashory

2022

Adv Elect Materials

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Micro/nanoelectromechanical systems (M/NEMS), especially micro/nanomechanical resonators, provide an unprecedented platform for investigating a wide range of applications in both fundamental physical phenomena (such as quantum‐level problems) and engineering and applied sciences (like sensing physical quantities and signal processing). In sensing context, these tiny resonators are invaluable tools for detecting weak forces and single molecules. Measuring such small variations in sub‐nanometer amplitudes at high frequencies has created many practical challenges. Therefore, maximizing the responsivity to a specified input parameter and minimizing the responsivity to other inputs such as noise are considered as the optimal design for the excellent performance in nanoresonators. The present review aims to summarize some of the recent progress in this rapidly advancing field. Specifically, more attention is paid to the topics related to the dynamical behaviors of micro/nanoresonator and their practical applications. First, the theory behind micro/nanoresonators is described. Then a summary is presented of the basic concepts in resonant devices. In addition, several commonly dynamical techniques to enhance sensitivity are introduced. Finally, the devices are classified based on linear and nonlinear, single and array, symmetric and asymmetric, and frequency shift‐based and amplitude shift‐based resonators, along with the relative advantages and disadvantages of each one in engineering applications.

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High pressure synthesis of amorphous TiO2 nanotubes

Cited by 17 publications

References 29 publications

Pressure Induced Nanoparticle Phase Behavior, Property, and Applications

Pressure Induced Nanoparticle Phase Behavior, Property, and Applications

Reciprocating Compression of ZnO Probed by X-ray Diffraction: The Size Effect on Structural Properties under High Pressure

A Comprehensive Categorization of Micro/Nanomechanical Resonators and Their Practical Applications from an Engineering Perspective: A Review

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