scholarly journals Synthesis and Optical Enhancement of Amorphous Carbon Nanotubes/Silver Nanohybrids via Chemical Route at Low Temperature

2014 ◽  
Vol 2014 ◽  
pp. 1-10
Author(s):  
Tan Kim Han ◽  
Leo Bey Fen ◽  
Ng Meng Nee ◽  
Mohd Rafie Johan
Keyword(s):  
Carbon Nanotubes ◽  
Low Temperature ◽  
Amorphous Carbon ◽  
X Ray Diffraction ◽  
Chemical Route ◽  
Xrd Pattern ◽  
Transmission Electron ◽  
Amorphous Nature ◽  
Simple Chemical ◽  
Uv Visible

We report the synthesis of amorphous carbon nanotubes/silver (αCNTs/Ag) nanohybrids via simple chemical route without additional reactant and surfactant at low temperature. Field emission scanning microscope (FESEM) and transmission electron microscope (TEM) confirmed formation of CNTs. X-ray diffraction (XRD) pattern confirmed the amorphous phase of carbon and the formation of Ag nanoparticles crystalline phase. Raman spectra revealed the amorphous nature ofαCNTs. UV-visible spectroscopy showed enhancement of optical properties ofαCNTs/Ag nanohybrids.

scholarly journals ATTAPULGITE CLAY OF THE VENTZIA BASIN, WESTERN MACEDONIA, GREECE, AS TEMPLATE IN SYNTHESIZING AMORPHOUS CARBON NANOTUBES

2017 ◽  
Vol 50 (4) ◽  
pp. 1895
Author(s):  
P. Koukakis ◽  
P. Tsakiridis ◽  
A. Ntziouni ◽  
K. Kordatos ◽  
M. Perraki
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Carbon Source ◽  
Ethylene Glycol ◽  
Amorphous Carbon ◽  
Furfuryl Alcohol ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Morphology And Structure ◽  
Amorphous Nature

Attapulgite from the Ventzia Basin, Western Macedonia, Greece, was used as a template for preparing amorphous carbon nanotubes by vapor deposition polymerization (VDP) method and two different alcohols, furfuryl alcohol and ethylene glycol, as carbon source. The morphology and structure of the as prepared carbon nanotubes were investigated by means of scanning electron microscopy and a transmission electron microscopy. X-ray diffraction and Raman spectroscopy were additionally employed. The amorphous nature of the carbon nanotubes has been confirmed by the XRD and the SAED pattern, as well as the Raman spectrum. No noticeable difference was observed in the morphology and structure of the as prepared carbon nanotubes regarding the type of alcohol used as carbon source. However, a difference in the quantity of the produced carbon nanotubes was noticed, with the furfuryl alcohol, as carbon source, producing a larger amount of carbon nanotubes than the ethylene glycol.

Luminescence Emission in Borotellurite Glass Containing Manganese Nanoparticles Doped Eu3+ Ions

2017 ◽  
Vol 268 ◽  
pp. 106-110
Author(s):  
Siti Maisarah Aziz ◽  
Md Rahim Sahar
Keyword(s):  
Emission Spectra ◽  
Average Diameter ◽  
Excitation Wavelength ◽  
X Ray Diffraction ◽  
Xrd Pattern ◽  
X Ray ◽  
Transmission Electron ◽  
Amorphous Nature ◽  
Schematic Energy Level Diagram ◽  
Manganese Nanoparticles

A series of europium doped magnesium borotellurite glasses embedded with manganese nanoparticles (Mn3O4 NPs) of composition (59-x)TeO2-30B2O3-10MgO-x1Eu2O3-1Mn3O4 with 0.5 ≤ x ≤ 1.5 mol % are prepared using melt quenching technique. The existence of broad hump in X-ray diffraction (XRD) pattern verifies the amorphous nature of glasses. The presence of Mn3O4 NPs with average diameter of ~11 nm and (1 0 3) lattice plane having 0.276 nm spacing in the glass matrix is confirmed by high resolution transmission electron microscope (HRTEM) image. The glass samples are excited under 390 nm excitation wavelength and the emission spectra are found to consist of four emission peaks centred at 587 nm, 610 nm, 651 nm and 700 nm assigned to the transition from 5D0 →7FJ (J = 1, 2, 3, 4) states. The schematic energy level diagram is proposed. All results will be discussed with respect to the composition of Eu3+ ion.

scholarly journals Synthesis and Characterization of Si Oxide Coated Nano Ceria by Hydrolysis, and Hydrothermal Treatment at Low Temperature

2017 ◽  
Vol 62 (2) ◽  
pp. 1125-1129
Author(s):  
M. Kong ◽  
H.W. Kim
Keyword(s):  
Electron Microscopy ◽  
Low Temperature ◽  
Silicon Oxide ◽  
X Ray Diffraction ◽  
Oxide Coatings ◽  
Transmission Electron ◽  
Amorphous Nature ◽  
Simple Growth ◽  
Solution Aggregation

AbstractThe purpose of this work was to the application of Si oxide coatings. This study deals with the preparation of ceria (CeO2) nanoparticles coating with SiO2by water glass and hydrolysis reaction. First, the low temperature hydro-reactions were carried out at 30~100°C. Second, Silicon oxide-coated Nano compounds were obtained by the catalyzing synthesis. CeO2Nano-powders have been successfully synthesized by means of the hydrothermal method, in a low temperature range of 100~200°C. In order to investigate the structure and morphology of the Nano-powders, scanning electron microscopy (SEM) and X-ray diffraction (XRD) were employed. The XRD results revealed the amorphous nature of silica nanoparticles. To analyze the quantity and properties of the compounds coated with Si oxide, transmission electron microscopy (TEM) in conjunction with electron dispersive spectroscopy was used. Finally, it is suggested that the simple growth process is more favorable mechanism than the solution/aggregation process.

CHARACTERIZATION AND PHOTOCATALYTIC ACTIVITY OF Zn2SnO4 NANOSTRUCTURES SYNTHESIZED VIA HYDROTHERMAL METHOD

2009 ◽  
Vol 23 (06n07) ◽  
pp. 1086-1092 ◽  
Author(s):  
YU-SHIANG WU ◽  
YUAN-HAUN LEE ◽  
CHUN-LIANG FENG
Keyword(s):  
Photocatalytic Activity ◽  
Hydrothermal Method ◽  
Light Absorption ◽  
Raman Shift ◽  
X Ray Diffraction ◽  
Absorption Properties ◽  
Xrd Pattern ◽  
Transmission Electron ◽  
Uv Visible ◽  
The Relationship

Nanosized zinc stannate Zn 2 SnO 4 ( ZTO ) was synthesized via a simple hydrothermal method using sodium hydroxide NaOH as a mineralizer. Hydrothermally treated at 150, 200, and 250°C for 24 h and 48 h, the X-ray diffraction (XRD) pattern showed that highly crystalline ZTO nanostructures could be formed at 200 and 250°C. Transmission electron microscopy (TEM) images showed that ZTO nanocubes were formed at 250°C, and a sheet-like structure was found at 200°C. Raman spectra revealed that ZTO had a spinel structure and there were two Raman shift peaks at approximately 668 and 535 cm-1, which were similar to the peaks of ZTO nanowires. Furthermore, the photocatalytic activity of the ZTO samples was assessed utilizing methylene blue (MB) under ultraviolet irradiation, and the UV-Visible light absorption spectra was investigated to interpret the relationship between photocatalytic properties and light absorptivity. The sheet-like ZTO nanostructures exhibited better photocatalytic activity due to their excellent light absorption properties.

Size-Dependent Structural, Optical and Vibrational Properties of ZnTe Nanoparticle

2020 ◽  
Vol 19 (05) ◽  
pp. 1950038
Author(s):  
Sayantani Das ◽  
Md Sariful Sheikh ◽  
Rajesh Mukherjee ◽  
Alo Dutta ◽  
T. P. Sinha
Keyword(s):  
Vibrational Modes ◽  
X Ray Diffraction ◽  
Chemical Route ◽  
Visible Absorption ◽  
Structural Investigations ◽  
Size Dependent ◽  
Tauc Plot ◽  
Transmission Electron ◽  
Crystallite Sizes ◽  
Uv Visible

ZnTe semiconductor nanoparticles have been prepared by soft chemical route using mercaptoethanol as capping agent to arrest the agglomeration. The structural investigations performed by X-ray diffraction technique show that the prepared samples have cubic structure. Average crystallite sizes of the prepared nanomaterial are estimated by Debye–Scherrer’s equation. The particle size of the synthesized material is estimated by transmission electron microscope (TEM). UV-visible absorption spectra gives the idea of the band gap of the sample using Tauc plot. The Raman spectroscopy measurements are performed to know the different vibrational modes of ZnTe. The impedance spectroscopy is applied to investigate the room temperature dielectric relaxation of the prepared samples in the frequency range from 100[Formula: see text]Hz to 1.1[Formula: see text]MHz.

Thermal Conductivity Analysis and Characterization of Copper Oxide Nanofluids through Different Techniques

2016 ◽  
Vol 40 ◽  
pp. 105-112 ◽  
Author(s):  
S. Nallusamy
Keyword(s):  
Thermal Conductivity ◽  
Copper Oxide ◽  
Average Crystallite Size ◽  
X Ray Diffraction ◽  
Visible Absorption ◽  
Xrd Pattern ◽  
Transmission Electron ◽  
Wet Chemical ◽  
Uv Visible

The aim of this research is to analyse the thermal conductivity of copper oxide (CuO) nanofluids. In the present study CuO nanofluids were prepared using a new method of wet chemical method and the testing was carried out by various techniques. X-Ray Diffraction (XRD) pattern was used to determine the crystal structure and the average crystallite size of the CuO nanofluids. Scanning Electron Microscope (SEM) and Transmission Electron Microscopy (TEM) were used to study the morphology and the particle size. Similarly Dynamic Light Scattering (DLS) was used to estimate the size of the CuO nanofluids. Finally UV-Visible absorption spectrum was used to measure the optical property of the CuO nanofluids. The thermal conductivity of CuO nanofluids was analyzed using KD2 Pro thermal property analyzer and concludes that the thermal conductivity is increased with the increase of particle loading.

Magnetic and dielectric properties of BiFeO3 nanoparticles

2015 ◽  
Vol 7 (2) ◽  
pp. 1393-1403
Author(s):  
Dr R.P VIJAYALAKSHMI ◽  
N. Manjula ◽  
S. Ramu ◽  
Amaranatha Reddy
Keyword(s):  
Diffuse Reflectance Spectrum ◽  
Precipitation Method ◽  
Secondary Phases ◽  
X Ray Diffraction ◽  
Bifeo3 Nanoparticles ◽  
Transmission Electron ◽  
Multiferroic Bifeo3 ◽  
Pure Phase ◽  
Simple Chemical ◽  
Co Precipitation

Single crystalline nano-sized multiferroic BiFeO3 (BFO) powders were synthesized through simple chemical co-precipitation method using polyethylene glycol (PEG) as capping agent. We obtained pure phase BiFeO3 powder by controlling pHand calcination temperature. From X-ray diffraction studies the nanoparticles were unambiguously identified to have a rhombohedrally distorted perovskite structure belonging to the space group of R3c. No secondary phases were detected. It indicates single phase structure. EDX spectra indicated the appearance of three elements Bi, Fe, O in 1:1:3. From the UV-Vis diffuse reflectance spectrum, the absorption cut-off wavelength of the BFO sample is around 558nm corresponding to the energy band gap of 2.2 eV. The size (60-70 nm) and morphology of the nanoparticles have been analyzed using transmission electron microscopy (TEM).   Linear M−H behaviour and slight hysteresis at lower magnetic field is observed for BiFeO3 nanoparticles from Vibrating sample magnetometer studies. It indicates weak ferromagnetic behaviour at room temperature. From dielectric studies, the conductivity value is calculated from the relation s = L/RbA Sm-1 and it is around 7.2 x 10-9 S/m.

Low Temperature Large Scale CVD Synthesis of Nano Onion-Like Fullerenes

2012 ◽  
Vol 490-495 ◽  
pp. 3211-3214 ◽  
Author(s):  
Lei Shan Chen ◽  
Cun Jing Wang
Keyword(s):  
Electron Microscopy ◽  
Low Temperature ◽  
Aluminum Hydroxide ◽  
Large Scale ◽  
Iron Catalyst ◽  
Chemical Vapor ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Naoh Solution ◽  
Synthesis Reactions

Synthesis reactions were carried out by chemical vapor deposition using iron catalyst supported on aluminum hydroxide at 400 °C and 420 °C, in the presence of argon as carrier gas and acetylene as carbon source. The aluminum hydroxide support was separated by refluxing the samples in 40% NaOH solution for 2 h and 36% HCl solution for 24 h, respectively. The samples were characterized by field-emission scanning electron microscopy, energy dispersive spectroscopy, high-resolution transmission electron microscopy and X-ray diffraction. The results show that carbon nanotubes were the main products at 420 °C, while large scale high purity nano onion-like fullerenes encapsulating Fe3C, with almost uniform sizes ranging from 10-50 nm, were obtained at the low temperature of 400 °C.

Polyaniline/SnO2 Nanocomposite Sensor for NO2 Gas Sensing at Low Operating Temperature

2015 ◽  
Vol 14 (04) ◽  
pp. 1550011 ◽  
Author(s):  
A. Sharma ◽  
M. Tomar ◽  
V. Gupta ◽  
A. Badola ◽  
N. Goswami
Keyword(s):  
Thin Films ◽  
Gas Sensing ◽  
High Sensitivity ◽  
Morphological Properties ◽  
X Ray Diffraction ◽  
Chemical Route ◽  
Sensing Properties ◽  
Response Recovery ◽  
Transmission Electron ◽  
Gas Sensing Properties

In this paper gas sensing properties of 0.5–3% polyaniline (PAni) doped SnO 2 thin films sensors prepared by chemical route have been studied towards the trace level detection of NO 2 gas. The structural, optical and surface morphological properties of the PAni doped SnO 2 thin films were investigated by performing X-ray diffraction (XRD), Transmission electron microscopy (TEM) and Raman spectroscopy measurements. A good correlation has been identified between the microstructural and gas sensing properties of these prepared sensors. Out of these films, 1% PAni doped SnO 2 sensor showed high sensitivity towards NO 2 gas along with a sensitivity of 3.01 × 102 at 40°C for 10 ppm of gas. On exposure to NO 2 gas, resistance of all sensors increased to a large extent, even greater than three orders of magnitude. These changes in resistance upon removal of NO 2 gas are found to be reversible in nature and the prepared composite film sensors showed good sensitivity with relatively faster response/recovery speeds.

Thermal conversion of CBD grown ZnS thin films to ZnO

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Kooliyankal Naseema ◽  
Kaniyamkandy Ribin ◽  
Nidiyanga Navya ◽  
Prasoon Prasannan
Keyword(s):  
Thin Films ◽  
Low Cost ◽  
Thermal Conversion ◽  
X Ray Diffraction ◽  
Xrd Pattern ◽  
Glass Substrates ◽  
Anion Substitution ◽  
Nano Crystalline ◽  
Before And After ◽  
Uv Visible

AbstractNano crystalline zinc sulfide thin films were deposited onto glass substrates by chemical bath deposition method. One of the samples was annealed at 300 °C for 2 h in air using a muffle furnace. The prepared thin films were investigated by X-ray diffraction (XRD), UV–visible spectroscopy (UV–vis), photoluminescence spectroscopy (PL), scanning electron microscopy (SEM) and Raman spectroscopy (FT-R) studies before and after annealing. The analysis confirmed the thermal-induced anion substitution and conversion of ZnS crystal to ZnO wurtzite crystal. XRD pattern showed that these films were phase pure and polycrystalline in nature. Optical band gap was found to be 3.86 eV for ZnS and 3.21 eV for ZnO. The films prepared by this simple, low-cost technique are suitable for photovoltaic and optoelectronic applications.

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