Ferromagnetic ZnO bicrystal nanobelts fabricated in low temperature

Xu, Congkang; Chun, Jang H.; Rho, Keehan; Jeong, Yoon Hee; Kim, Dong-Eon; Chon, Bonghwan; Hong, Sungchul; Joo, Taiha

doi:10.1063/1.2339048

Cited by 20 publications

(31 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…ZnO-based bicrystals in the form of belts exhibit excellent optical, magnetic, and electrical properties. 152,167 The photoluminescence properties, especially green emission observed at 535 nm, are found to orginate from ZnS nanobelts containing line/planar defects. 150 Two-dimensional nanostructures of noble metal platelets are of great importance for the application of biosensors, 7 photoluminescence, 138 biodiagnostics, 168 surface-enhanced Raman scattering, and IR-absorbing optical coatings.…”

Section: Two-dimensional Nanostructuresmentioning

confidence: 97%

Mechanistic Aspects of Shape Selection and Symmetry Breaking during Nanostructure Growth by Wet Chemical Methods

et al. 2009

View full text Add to dashboard Cite

The control of shapes of nanocrystals is crucial for using them as building blocks for various applications. In this paper, we present a critical overview of the issues involved in shape-controlled synthesis of nanostructures. In particular, we focus on the mechanisms by which anisotropic structures of high-symmetry materials (fcc crystals, for instance) could be realized. Such structures require a symmetry-breaking mechanism to be operative that typically leads to selection of one of the facets/directions for growth over all the other symmetry-equivalent crystallographic facets. We show how this selection could arise for the growth of one-dimensional structures leading to ultrafine metal nanowires and for the case of two-dimensional nanostructures where the layer-bylayer growth takes place at low driving forces leading to plate-shaped structures. We illustrate morphology diagrams to predict the formation of two-dimensional structures during wet chemical synthesis. We show the generality of the method by extending it to predict the growth of plate-shaped inorganics produced by a precipitation reaction. Finally, we present the growth of crystals under high driving forces that can lead to the formation of porous structures with large surface areas.

show abstract

Section: Two-dimensional Nanostructuresmentioning

confidence: 97%

Mechanistic Aspects of Shape Selection and Symmetry Breaking during Nanostructure Growth by Wet Chemical Methods

et al. 2009

View full text Add to dashboard Cite

show abstract

“…Following these successful fabrications, other belt‐like nanostructures have also been fabricated by various methods 4–23. The as‐synthesized oxide or non‐oxide semiconductor nanobelts are pure, structurally uniform, and single crystalline, and most of them are free of defects such as vacancies and dislocations unless consciously doped 1–23. They have a rectangle‐like cross‐section with typical widths of several hundred nanometers, width‐to‐thickness ratios of 5–10, and lengths of hundreds of micrometers.…”

Section: Introductionmentioning

confidence: 99%

“…The belt‐like nanostructures have been expected to be important building blocks for nanodevices and to offer exciting opportunities for both fundamental research and technological applications. Some of their physical properties have been investigated experimentally 11–23. Some nanobelts are ferromagnetic (FM) and the Curie point can even be above room temperature 15–22.…”

Section: Introductionmentioning

confidence: 99%

Theoretical investigations of magnetic properties of ferromagnetic single‐layered nanobelts

Wang

Zhou

2010

Physica Status Solidi (b)

View full text Add to dashboard Cite

The magnetic properties of ferromagnetic (FM) single-layered nanobelts are investigated if there exists a single-ion anisotropy. The magnetic quantities as functions of belt width and temperature are calculated. The spontaneous magnetization, area of the hysteresis loop, and energy level extension increase with belt width, and decrease with temperature. The Curie temperature increases with belt width. The energy spectra are calculated. When the belt width is fixed, a higher temperature leads to lower energy spectra. The spin-wave energy, as well as the energy level extension, drops with temperature rising, and becomes zero as the temperature reaches the Curie temperature. The results are compared with those of FM single-walled nanotubes. The Curie point T C of a nanobelt is always smaller than that of a nanotube, when the width of the former and the perimeter of the latter are equal, and the reason is analyzed.

show abstract

“…Recently, ZnO-based nanostructures have attracted attention due to their potential applications in ultraviolet (UV) to violet light-emitting and other optoelectronic devices. Several kinds of ZnO material nanostructures have been fabricated such as nanowires [3,4], nanobelts [5,6], nanorods [7,8], nanodisks and quantum dots (QD) [9,10]. In the absence of an electric field, optical absorption in ZnO QD has been investigated experimentally in recent papers [11,12], which shows that the threshold energy and strength of optical absorption decreases when the quantum size increases in ZnO QD.…”

Section: Introductionmentioning

confidence: 99%