Synthesis and characterization of 3D Cu0.45Mn0.55O2 nanoflowers with novel photoluminescence and magnetic properties

In this paper, three-dimensional (3D) Cu 0.45 Mn 0.55 O 2 nanoflowers self-assembled by interconnecting dense stacked single-crystalline nanoplates have been prepared using the template-free hydrothermal growth method. The morphology, phase structure and composition of the as-prepared nanomaterial were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM) with selected area electron diffraction (SAED) and energy-dispersive X-ray spectroscopy (EDX). FESEM and TEM analyses show that the size of 3D Cu 0.45 Mn 0.55 O 2 nanoflowers is in the range of 1–1.5 μm and the thickness of interconnected nanoplates is about 40 nm on the average. The photoluminescence (PL) spectra of the as-prepared Cu 0.45 Mn 0.55 O 2 nanostructures at room temperature exhibits prominent emission bands located in red–violet spectral region. Moreover, magnetic investigations revealed the weak ferromagnetic behavior of the as-prepared Cu 0.45 Mn 0.55 O 2 nanoflowers and reported for the first time using vibrating sample magnetometer (VSM).

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Quartz Crystallite Size and Moganite Content as Indicators of the Mineralogical Maturity of the Carboniferous Chert: The Case of Cherts from Eastern Asturias (Spain)

Minerals ◽

10.3390/min11060611 ◽

2021 ◽

Vol 11 (6) ◽

pp. 611

Author(s):

Celia Marcos ◽

María de Uribe-Zorita ◽

Pedro Álvarez-Lloret ◽

Alaa Adawy ◽

Patricia Fernández ◽

...

Keyword(s):

Electron Microscopy ◽

Transmission Electron Microscopy ◽

Crystallite Size ◽

Archaeological Sites ◽

X Ray Diffraction ◽

X Ray ◽

Transmission Electron ◽

Infrared And Raman Spectroscopy ◽

First Time ◽

Geological Formations

Chert samples from different coastal and inland outcrops in the Eastern Asturias (Spain) were mineralogically investigated for the first time for archaeological purposes. X-ray diffraction, X-ray fluorescence, transmission electron microscopy, infrared and Raman spectroscopy and total organic carbon techniques were used. The low content of moganite, since its detection by X-ray diffraction is practically imperceptible, and the crystallite size (over 1000 Å) of the quartz in these cherts would be indicative of its maturity and could potentially be used for dating chert-tools recovered from archaeological sites. Also, this information can constitute essential data to differentiate the cherts and compare them with those used in archaeological tools. However, neither composition nor crystallite size would allow distinguishing between coastal and inland chert outcrops belonging to the same geological formations.

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Boron Nitride Nanotubes: Nanoparticles Functionalization and Junction Fabrication

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2007.120 ◽

2007 ◽

Vol 7 (2) ◽

pp. 530-534 ◽

Cited By ~ 16

Author(s):

Chunyi Zhi ◽

Yoshio Bando ◽

Guozhen Shen ◽

Chengchun Tang ◽

Dmitri Golberg

Keyword(s):

Electron Microscopy ◽

Transmission Electron Microscopy ◽

Boron Nitride ◽

Boron Nitride Nanotubes ◽

X Ray Diffraction ◽

Carbon Nanostructure ◽

Wet Chemistry ◽

X Ray ◽

Transmission Electron ◽

First Time

Adopting a wet chemistry method, Au and Fe3O4 nanoparticles were functionalized on boron nitride nanotubes (BNNTs) successfully for the first time. X-ray diffraction pattern and transmission electron microscopy were used to characterize the resultant products. Subsequently, a method was proposed to fabricate heterojunction structures based on the particle-functionalized BNNTs. As a demonstration, BNNT-carbon nanostructure, BNNT-ZnO and BNNT-Ga2O3 junctions were successfully fabricated using the functionalized particles as catalysts.

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On the destruction of kaolinite and gibbsite by phenylphosphonic, phenylphosphinic and phenylarsonic acids: evidence for the formation of new Al compounds

Clay Minerals ◽

10.1180/0009855043940142 ◽

2004 ◽

Vol 39 (4) ◽

pp. 391-404 ◽

Cited By ~ 8

Author(s):

J. E. F. C. Gardolinski ◽

G. Lagaly ◽

M. Czank

Keyword(s):

Electron Microscopy ◽

Thermal Analysis ◽

Transmission Electron Microscopy ◽

Fourier Transform ◽

Linear Chain ◽

X Ray Diffraction ◽

Phenylphosphonic Acid ◽

X Ray ◽

Selected Area Electron Diffraction ◽

Transmission Electron

AbstractKaolinite and synthetic γ-Al(OH)3 (gibbsite or hydrargillite) were reacted with phenylphosphonic, phenylphosphinic and 2-nitrophenol-4-arsonic acids. The products were studied by powder X-ray diffraction, transmission electron microscopy/selected area electron diffraction/ energy dispersive X-ray/Fourier transform infrared and simultaneous thermogravimetric/differential thermal analysis. The acids were not intercalated but, instead, easily destroyed the structure of the minerals. Lamellar Al phenylphosphonate and aluminium phenylphosphinate and phenylarsonate with polymeric linear-chain structures were formed from kaolinite. The reaction between gibbsite and the same acids yielded almost identical products. No evidence of formation of grafted kaolinite derivatives after the reaction with phenylphosphonic acid was found.

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Fabrication of boron carbonitride (BCN) nanotubes and giant fullerene cages

Canadian Journal of Chemistry ◽

10.1139/v10-146 ◽

2010 ◽

Vol 88 (12) ◽

pp. 1256-1261 ◽

Cited By ~ 4

Author(s):

Guifang Sun ◽

Faming Gao ◽

Li Hou

Keyword(s):

Electron Microscopy ◽

Transmission Electron Microscopy ◽

The Novel ◽

X Ray Diffraction ◽

Boron Carbonitride ◽

X Ray ◽

Transmission Electron ◽

New Form ◽

First Time ◽

Electron Energy Loss

Boron carbonitride (BCN) nanotubes have been successfully prepared using NH4Cl, KBH4, and ZnBr2 as the reactants at 480 °C for 12 h by a new benzene-thermal approach in a N2 atmosphere. As its by-product, a new form of carbon regular hexagonal nanocages are observed. The samples are characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, transmission electron microscopy (TEM), transmission electron diffraction (TED), electron energy loss spectroscopy (EELS), and high-resolution transmission electron microscopy (HRTEM). The prepared nanotubes have uniform outer diameters in the range of 150 to 500 nm and a length of up to several micrometerss. The novel carbon hexagonal nanocages have a typical size ranging from 100 nm to 1.5 µm, which could be the giant fullerene cages of [Formula: see text] (N = 17∼148). So, high fullerenes are observed for the first time. The influences of reaction temperature and ZnBr2 on products and the formation mechanism of BCN nanotubes are discussed.

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FABRICATION AND CHARACTERISTICS OF ALN NANOWIRES

Modern Physics Letters B ◽

10.1142/s0217984901003068 ◽

2001 ◽

Vol 15 (30) ◽

pp. 1455-1458 ◽

Cited By ~ 8

Author(s):

H. CHEN ◽

X. K. LU ◽

S. Q. ZHOU ◽

X. H. HAO ◽

Z. X. WANG

Keyword(s):

Crystal Structure ◽

Electron Microscopy ◽

Transmission Electron Microscopy ◽

Single Phase ◽

X Ray Diffraction ◽

X Ray ◽

Selected Area Electron Diffraction ◽

Transmission Electron ◽

Sublimation Method ◽

Scanning Electron

Single phase AlN nanowires are fabricated by a sublimation method. They were characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), typical selected area electron diffraction (SAED) and high-resolution transmission electron microscopy (HRTEM). The SEM and TEM images show that most of the nanowires have diameters of about 10–60 nm. The crystal structure of AlN nanowires revealed by XRD, SAED and HRTEM shows the AlN nanowires have a wurtzite structure.

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PHOTOLUMINESCENCE SPECTRA AND MAGNETIC PROPERTIES OF HYDROTHERMALLY SYNTHESIZED MnO2 NANORODS

Modern Physics Letters B ◽

10.1142/s0217984913502114 ◽

2013 ◽

Vol 27 (29) ◽

pp. 1350211 ◽

Cited By ~ 6

Author(s):

ARBAB MOHAMMAD TOUFIQ ◽

FENGPING WANG ◽

QURAT-UL-AIN JAVED ◽

QUANSHUI LI ◽

YAN LI

Keyword(s):

Electron Microscopy ◽

Transmission Electron Microscopy ◽

Room Temperature ◽

Blue Emission ◽

Green Emission ◽

X Ray Diffraction ◽

X Ray ◽

Selected Area Electron Diffraction ◽

Uv Emission ◽

Transmission Electron

In this paper, single crystalline tetragonal MnO 2 nanorods have been synthesized by a simple hydrothermal method using MnSO 4⋅ H 2 O and Na 2 S 2 O 8 as precursors. The crystalline phase, morphology, particle sizes and component of the as-prepared nanomaterial were characterized by employing X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED) and energy-dispersive X-ray spectroscopy (EDS). The photoluminescence (PL) emission spectrum of MnO 2 nanorods at room temperature exhibited a strong ultraviolet (UV) emission band at 380 nm, a prominent blue emission peak at 453 nm as well as a weak defect related green emission at 553 nm. Magnetization (M) as a function of applied magnetic field (H) curve showed that MnO 2 nanowires exhibited a superparamagnetic behavior at room temperature which shows the promise of synthesized MnO 2 nanorods for applications in ferrofluids and the contrast agents for magnetic resonance imaging. The magnetization versus temperature curve of the as-obtained MnO 2 nanorods shows that the Néel transition temperature is 94 K.

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Microcavity Effects in The Luminescence of GaAs Microcrystals

MRS Proceedings ◽

10.1557/proc-283-801 ◽

1992 ◽

Vol 283 ◽

Author(s):

S. Juen ◽

K. F. Lamprecht ◽

R. Rodrigues ◽

R. A. Höpfel

Keyword(s):

Electron Microscopy ◽

Transmission Electron Microscopy ◽

Electron Diffraction ◽

Three Dimensional ◽

Photoluminescence Spectra ◽

X Ray Diffraction ◽

Bulk Gaas ◽

X Ray ◽

Transmission Electron ◽

Spectral Enhancement

ABSTRACTExperimental photoluminescence spectra of GaAs microcrystals show pronounced variations compared to the luminescence of bulk GaAs. The observed spectra are explained by spectral enhancement and inhibition of spontaneous emission in a three-dimensional optical resonator formed by a dielectrically confined semiconductor microcrystal. The crystals were produced by pulverization of bulk GaAs, size-separated by sedimentation techniques, and characterized by transmission electron microscopy, electron diffraction and x-ray diffraction.

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Synthesis Of Highly Ordered Macroporous Minerals: Extension of the Synthetic Method to Other Metal Oxides and Organic-Inorganic Composites

MRS Proceedings ◽

10.1557/proc-549-61 ◽

1998 ◽

Vol 549 ◽

Cited By ~ 8

Author(s):

C.F. Blanford ◽

T.N. Do ◽

B.T. Holland ◽

A. Stein

Keyword(s):

Electron Microscopy ◽

Metal Oxides ◽

Three Dimensional ◽

X Ray Diffraction ◽

X Ray ◽

Selected Area Electron Diffraction ◽

Transmission Electron ◽

Wide Range ◽

Ordered Macroporous ◽

Lower Temperature

AbstractThe facile synthesis of three-dimensional macroporous arrays of titania, zirconia and alumina was recently reported [1]. The synthesis of these materials has now been extended to the oxides of iron, tungsten, and antimony, as well as a mixed yttrium-zirconium system and organically modi- fied silicates. These materials were characterized by Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected area electron diffraction (SAED), X-ray energy dispersive spectrometry (EDS), and powder X-ray diffraction (XRD). Ordered structures of iron, tungsten, and antimony were formed from alkoxide precursors as in the originally reported synthesis, but the template was removed at a lower temperature. Samples of vinyl- and 2-cyanoethyl-modified silicates were formed from a mixture of organotrialkoxysilane and tetraalkoxysilane precursors; the polystyrene template was removed by extraction with a THF/acetone mixture. These results show the ease of extending the original syn- thesis to a wide range of systems. Also, the ability to form homogenous mixed-metal oxides will be important for tailoring the dielectric and photonic properties of these materials.

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SONOCHEMICAL SYNTHESIS AND MICROSTRUCTURE CHARACTERIZATION OF Fe3O4 AND ZnFe2O4 NANOCRYSTALLINES

International Journal of Modern Physics B ◽

10.1142/s0217979205031237 ◽

2005 ◽

Vol 19 (15n17) ◽

pp. 2508-2513 ◽

Cited By ~ 1

Author(s):

JIANMIN ZHU ◽

SHISONG HUANG ◽

GUOBIN MA ◽

NAIBEN MING

Keyword(s):

Electron Microscopy ◽

Transmission Electron Microscopy ◽

High Resolution ◽

Sonochemical Method ◽

X Ray Diffraction ◽

Sonochemical Synthesis ◽

X Ray ◽

Selected Area Electron Diffraction ◽

Transmission Electron

By means of sonochemical method, Fe 3 O 4 and ZnFe 2 O 4 nanocrystallines can be synthesized from FeCl 2/ urea and ZnCl 2/ FeCl 2/ urea in water. The products were characterized by powder X-ray diffraction (XRD) and transmission electron microscopy (TEM) as well as selected area electron diffraction (SAED). Special attention was paid to the microstructure of the nanocrystallines using high-resolution transmission electron microscopy (HREM). Probable mechanisms for the sonochemical formation of Fe 3 O 4 and ZnFe 2 O 4 nanocrystallines are discussed.

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CARBON NANOTUBES/GRAPHENE THREE-DIMENSIONAL NETWORKS ARCHITECTURE LOADING WITH Ni AND ITS ADSORPTION PROPERTIES

NANO ◽

10.1142/s1793292014500192 ◽

2014 ◽

Vol 09 (02) ◽

pp. 1450019 ◽

Cited By ~ 2

Author(s):

BIN ZENG ◽

YOUXIN LUO ◽

QIYUAN LIU ◽

WUJUN ZENG

Keyword(s):

Electron Microscopy ◽

Carbon Nanotubes ◽

Three Dimensional ◽

Ni Nanoparticles ◽

X Ray Diffraction ◽

High Adsorption ◽

X Ray ◽

Transmission Electron ◽

3D Network ◽

First Time

The composite of carbon nanotubes/graphene networks loaded- Ni (CNTs/GR- Ni ) were successfully synthesized by spray drying and post-calcinating method for the first time. The synthesized products were systematically studied by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The result showed the hybrid of CNTs and graphene composed the 3D network structure and Ni nanoparticles were attaching on their surface. Adsorption performance evidenced that the obtained nanocomposite possessed high adsorption efficiency and excellent separation property.

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