Possible role of hydroxyl group on local structure and phase transition of KNbO3 and KTaO3 nanocrystals

Yun, B.K.; Koo, Y. S.; Jung, Jong Hoon; Song, Min Jong; Yoon, Seokhyun

doi:10.1016/j.physb.2010.09.022

Cited by 15 publications

(6 citation statements)

References 26 publications

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“…We note a slight experimental difference of the lattice cell parameters. Due to the hydrolysis nature of hydrothermal processes, some hydroxyl groups remain inside in the KN compounds [14]. To investigate the impurity of hydrothermally synthesized KN FT-IR and TG measurements were performed (Fig.…”

Section: Methodsmentioning

confidence: 99%

Characterization of KNbO3 nanoplates synthesized by a stirred hydrothermal process

et al. 2015

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Section: Methodsmentioning

confidence: 99%

Characterization of KNbO3 nanoplates synthesized by a stirred hydrothermal process

et al. 2015

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“…17,18 Therefore, KN nanowires and nanoparticles have been synthesized for various applications, and their structural and electrical properties have been investigated. 5,[19][20][21][22][23][24] Moreover, NGs were synthesized using KN nanowires and PDMS (K-P) composites, and these NGs showed an output voltage of 3.2 V and an output current of 67.5 nA. 5 However, detailed studies to determine the optimum amount of KN nanowires and to investigate the effect of process conditions on the output energy of KN NGs have not been carried out.…”

Section: Introductionmentioning

confidence: 99%

Piezoelectric nanogenerators synthesized using KNbO₃nanowires with various crystal structures

Joung

Seo

et al. 2014

J. Mater. Chem. A

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KNbO 3 (KN) nanowires having a tetragonal structure or a polymorphic phase boundary (PPB) structure, which contains both tetragonal (P4mm) and orthorhombic (Amm2) structures, are formed at low temperatures. The presence of tetragonal and PPB KN nanowires is attributed to the existence of OH À and H 2 O defects. Further, the tetragonal and PPB KN nanowires change to orthorhombic KN nanowires in the temperature range between 300 and 400 C owing to desorption of the lattice hydroxyl group. A composite consisting of polydimethylsiloxane (PDMS) and KN nanowires having a PPB structure shows large dielectric constant and low dielectric loss values of 9.2 and 0.5%, respectively, at 100 kHz.Moreover, a nanogenerator (NG) synthesized using the PPB KN nanowires exhibits the largest output voltage and current among NGs synthesized using the tetragonal or orthorhombic KN nanowires. In particular, the NG containing 0.7 g of PPB KN nanowires shows an output voltage of 10.5 V and an output current of 1.3 mA; these values are among the highest ever reported for NGs synthesized using a lead-free composite. In addition, this NG exhibited the maximum output power and energy conversion efficiency, which were 4.5 mW and 0.9%, respectively, for an external load of 1.0 MU.

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“…The results presented show how not only does the surface phase and composition play a role in the growth of nanoparticles but also how chemisorption and surface energy can affect the growth morphology of nanoparticles. The role of hydroxyl groups on the synthesis and properties of KNO and KTO nanoparticles have been studied previously; ,,, however, the effect of hydroxyl groups on the surface has not been as extensively explored. In this case, the chemisorption of water had little effect on the Ta-rich surfaces but had a significant role in decreasing the surface energy of the Nb-rich surfaces.…”

Section: Resultsmentioning

confidence: 99%

Chemisorption-Driven Roughening of Hydrothermally Grown KTa_1–xNb_xO₃ Nanoparticles

Wen

Marks

2020

J. Phys. Chem. C

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The chemical and physical properties of nanoparticle surfaces have significant effects on their growth processes and the resulting morphology. Hydrothermally grown KNbO3, KTaO3, and KTa1–x Nb x O3 were studied to examine the complex relationships between surface composition, phase, chemistry, and energetics and how these may be used to model and thereby control nanoparticle growth mechanisms. Two different composition-dependent growth modes were identified, where one type formed smooth surface facets, while the other resulted in roughened nanoparticle morphologies. Electron microscopy characterization, density functional theory calculations, and mathematical growth models were used to illuminate the role of surface properties and chemisorption on the nanoparticle growth morphology. Surface energy reduction by chemisorption can increase the rate of terrace nucleation, driving the roughening of these lower energy nanoparticle surfaces.

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Possible role of hydroxyl group on local structure and phase transition of KNbO3 and KTaO3 nanocrystals

Cited by 15 publications

References 26 publications

Characterization of KNbO3 nanoplates synthesized by a stirred hydrothermal process

Characterization of KNbO3 nanoplates synthesized by a stirred hydrothermal process

Piezoelectric nanogenerators synthesized using KNbO₃nanowires with various crystal structures

Chemisorption-Driven Roughening of Hydrothermally Grown KTa_1–xNb_xO₃ Nanoparticles

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Possible role of hydroxyl group on local structure and phase transition of KNbO3 and KTaO3 nanocrystals

Cited by 15 publications

References 26 publications

Characterization of KNbO3 nanoplates synthesized by a stirred hydrothermal process

Characterization of KNbO3 nanoplates synthesized by a stirred hydrothermal process

Piezoelectric nanogenerators synthesized using KNbO3nanowires with various crystal structures

Chemisorption-Driven Roughening of Hydrothermally Grown KTa1–xNbxO3 Nanoparticles

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Product

Resources

About

Piezoelectric nanogenerators synthesized using KNbO₃nanowires with various crystal structures

Chemisorption-Driven Roughening of Hydrothermally Grown KTa_1–xNb_xO₃ Nanoparticles