VLS Synthesis and Characterization of SnO2 Nanowires

2012 ◽  
Vol 1371 ◽  
Author(s):  
Dulce N. Castillo ◽  
Tomás D. Becerril ◽  
Enrique R. Andrés ◽  
Héctor J. Santiesteban ◽  
Godofredo G. Salgado
Keyword(s):  
Tin Dioxide ◽  
Broad Band ◽  
Average Diameter ◽  
Rutile Structure ◽  
1D Nanostructures ◽  
The Core ◽  
Sno2 Nanowires ◽  
Tetragonal Rutile Structure ◽  
20 Nm

ABSTRACTWe have synthesized core-shell 1D nanostructures by the Vapor-Liquid-Solid (VLS) mechanism. Gold (Au) was used as a catalyst and tin oxide (SnO) powder as a precursor; the growth temperature was of 600 °C. These structures were characterized by XRD, SEM, TEM, EDS, and PL. The nanowires have an average diameter of 20 nm and their lengths are of tens of micrometers; the core is tin dioxide (SnO2) with the tetragonal rutile structure and it has an average diameter of 12 nm; the shell is amorphous Sn of 8 nm average thickness. Photoluminescence measurements show a broad band in the 400-800 nm range. On the same growth process, SnO2 nanoparticles and a mixture of SnO2 rods and wires were also obtained, at 400 °C and 800 °C, respectively.

Synthesis and Characterization of SnO2 Nanowires Materials Prepared from Tin Powder

2010 ◽  
Vol 93-94 ◽  
pp. 421-424 ◽  
Author(s):  
P. Inchidjuy ◽  
Ki Seok An ◽  
Supakorn Pukird
Keyword(s):  
Tin Dioxide ◽  
Typical Feature ◽  
Vibration Modes ◽  
X Ray Diffraction ◽  
Rutile Structure ◽  
X Ray ◽  
Sno2 Nanowires ◽  
Tetragonal Rutile Structure ◽  
Xrd Patterns

Tin dioxide (SnO2) materials are prepared by using vapor transport techniques through a vapor-liquid-solid (VLS) mechanism from Tin (Sn) powder. The SnO2 materials are synthesized onto the silicon substrate at temperatures 850 0C. Crystalline structure of SnO2 nanowires was investigated by X-ray diffraction (XRD) spectroscopy. XRD patterns of SnO2 exhibited tetragonal rutile structure with lattice parameters of a = 4.73 oA and c = 3.18 oA. Surface morphology of SnO2 films was characterized by scanning electron microscope (SEM), that SEM micrographs indicate nanowires-like structure. The Raman spectra of single-crystalline rutile SnO2 nanowires were studied, three vibration modes were observed at 475, 635 and 775 cm-1 corresponded to the typical feature of the SnO2 nanowires. A room temperature photoluminescence (PL) spectrum of SnO2 nanowires were in visible emission range.

Preparation and characterization of poly(styrenemethacrylic acid)/MCM-41 core/shell nanocomposite microspheres

e-Polymers ◽  
2009 ◽  
Vol 9 (1) ◽  
Author(s):  
Yansheng Zhao ◽  
Xingji Ma ◽  
Yongmei Liu ◽  
Guangwei Yuan ◽  
Meijuan Guo ◽  
...  
Keyword(s):  
Self Assembly ◽  
Cetyltrimethylammonium Bromide ◽  
Average Diameter ◽  
Molar Ratio ◽  
Core Shell ◽  
Acidic Media ◽  
Assembly Method ◽  
20 Nm ◽  
Mcm 41

AbstractIn acidic media, poly(styrene-methacrylic acid)/MCM-41 [P(St- MAA)/MCM-41] core/shell microspheres were synthesized using monodisperse P(St-MAA) particles contained in soap-free emulsion and cetyltrimethylammonium bromide as co-templates by adsorption self-assembly method. The effects of P(St- MAA) composition on shell structure of the core/shell microspheres were investigated. The morphology and composition of P(St-MAA)/MCM-41 microspheres were characterized by TEM, XRD and FTIR. The results show that the ordering degree of MCM-41 shells increased as the molar ratio of MAA to St increased. When n(MAA)/n(St) is 0.2, the average diameter and the shell thickness of nanocomposite microspheres are about 170 nm and 20 nm, respectively.

Synthesis and Characterization of Fluorine-Doped Tin Oxide Nanocrystals Prepared by Sol-Gel Method

2014 ◽  
Vol 977 ◽  
pp. 59-62 ◽  
Author(s):  
Jun Qing Tian ◽  
Hai Ying Shi ◽  
Wei Zheng
Keyword(s):  
Tin Dioxide ◽  
Sol Gel ◽  
Molar Ratio ◽  
X Ray Diffraction ◽  
Gel Method ◽  
Sol Gel Method ◽  
Hall Effect Sensor ◽  
Precursor Material ◽  
20 Nm

Fluorine-doped tin dioxide (FTO) nanocrystals were prepared with sol–gel method using SnCl4·5H2O and NH4F as precursor material. The FTO was characterized with X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Differential Thermal Analysis and Thermal Grativity (DTA-TG) and Infrared Radiation (IR) respectively. The electrical property was measured with Hall Effect Sensor. The result of XRD and SEM shows that FTO nanocrystal size is about 20 nm and the dimension of the grain is about 300 nm. IR spectrum analysis proves fluorine doping. The crystal phase transformation was discussed with DTA-TG curve. When the sintering temperature is 450°C, the sintering time is 60 min, and the molar ratio of F to Sn is 2:10, the sheet resistance of FTO film is 107Ω/□.

scholarly journals Production and characterization of lipid microparticles produced by spray cooling encapsulating a low molar mass hydrophilic compound

2010 ◽  
Vol 30 (1) ◽  
pp. 276-281 ◽  
Author(s):  
Alda Jusceline Leonel ◽  
Hulda Noemi Mamani Chambi ◽  
Daniel Barrera-Arellano ◽  
Heloise Oliveira Pastore ◽  
Carlos Raimundo Ferreira Grosso
Keyword(s):  
Glucose Solution ◽  
Spherical Shape ◽  
Average Diameter ◽  
Solution Concentration ◽  
Spray Cooling ◽  
The Core ◽  
Lipid Mixtures ◽  
Continuous Surface ◽  
Lipid Microparticles

The objective of this research was to produce and characterize lipid particles (MpLs) that may be used as carriers of high amounts of hydrophilic core and evaluate the influence of the core amount on the performance of lipid microparticles. The MpLs were produced by spray cooling from solid and liquid lipid mixtures (stearic and oleic fatty acids and partly hydrogenated vegetable fat) containing glucose solution as core and soy lecithin as surfactant. The performance of MpLs was evaluated by means of the effective amount of encapsulated core, the core amount present on the surface of MpLs (superficial glucose) and the core release profile in aqueous solution. Morphological observations showed that MpLs presented spherical shape and a rugged and continuous surface, and an average diameter between 25 and 32 µm. The effective amount of encapsulated core was greater than 78% for all formulations evaluated. Larger amounts of superficial glucose were found in formulations in which more concentrated glucose solutions were used, regardless of the glucose lipid-solution ratio. The release results showed that core retention was significantly influenced by the glucose solution concentration, whereas release modulation was influenced by the glucose lipid-solution ratio.

Synthesis of Hydroxyapatite Nanoparticle from Tutut (Bellamya javanica) Shells by Using Precipitation Method for Artificial Bone Engineering

2014 ◽  
Vol 896 ◽  
pp. 284-287 ◽  
Author(s):  
Lenita Herawaty ◽  
Eti Rohaeti ◽  
Charlena ◽  
Sulistioso Giat Sukaryo
Keyword(s):  
Average Diameter ◽  
Deposition Process ◽  
Hexagonal Structure ◽  
Precipitation Method ◽  
Artificial Bone ◽  
X Ray Diffraction ◽  
Bone Engineering ◽  
Diffraction Patterns ◽  
20 Nm

The synthesis and characterization of both structural and microstructure of hydroxyapatite (HAp) nanoparticles by using precipitation method have been performed. Orthophosphoric acid solution (H3PO4) 0.3 M was dropped into the suspension of Ca(OH)2 from tutut (Bellamya javanica) shells at pH 10 and added by NH4OH 1 M at the final deposition process. The precipitate was filtered and then heated in a furnace at temperature of 1000 °C for 3 hours. The result of elemental analysis showed that the Ca/P ratio of HAp sample was 1.71. X-ray diffraction patterns showed that the sample was a single phase of Ca10(PO4)6(OH)2 with hexagonal structure (P63/m) and lattice parameters of a = b = 9.418(3) Å, c = 6.885(2) Å, a = b = 90o, g = 120o, V = 528.9(4) Å3, and r = 3.084 g cm-3. The as-synthesized HAp has crystallite and particle sizes of 16.1055 and 89.15 nm, respectively. The TEM image revealed that the HAp particles have spherical-polygonal shape with an average diameter particles of around 10-20 nm. It was concluded that the synthesis of HAp nanoparticles from tutut (Bellamya javanica) shells by using a wet precipitation method has been successfully carried out and the as-synthesized HAp was potential to be applied as materials for artificial bone engineering.

SnO2 Nanowires with Branched Structures Synthesized by Thermal Evaporation of Sn Powders

2007 ◽  
Vol 336-338 ◽  
pp. 2160-2162
Author(s):  
Hyoun Woo Kim ◽  
S.H. Shim
Keyword(s):  
Visible Light ◽  
Thermal Evaporation ◽  
Light Emission ◽  
Sem Images ◽  
Rutile Structure ◽  
Sno2 Nanowires ◽  
Tetragonal Rutile Structure ◽  
Branched Structures ◽  
Pl Spectrum ◽  
Visible Light Emission

Branched SnO2 nanowires were prepared by heating Sn powders. SEM images indicated that the single branched nanowires had diameters in the range 50-300 nm. XRD and SAED analysis revealed that the SnO2 nanowires were crystalline with tetragonal rutile structure. PL spectrum showed visible light emission.

Characterization of Iron and Its Nitride Nanoparticles Prepared by CVC Process without Using a Chiller

2005 ◽  
Vol 486-487 ◽  
pp. 518-521 ◽  
Author(s):  
D.W. Lee ◽  
Tae Suk Jang ◽  
Dae Hoon Lee ◽  
Byoung Kee Kim
Keyword(s):  
Reaction Temperature ◽  
Iron Nanoparticles ◽  
Amorphous Layer ◽  
Iron Nitride ◽  
Core Shell ◽  
Iron Particles ◽  
The Core ◽  
20 Nm ◽  
Work Chamber

Iron and its nitride (e-Fe3N) nanoparticles were fabricated by the CVC using Fe(CO)5 precursor without the aid of LN2 chiller. The iron particles synthesized at 400 oC were a mixture of amorphous and crystalline a-Fe. Fully crystallized iron particles were then obtained above 600 oC. Iron-nitride particles that were easily formed at 500 oC at 1 atm., however, were not fully developed in vacuum unless the reaction temperature reached 850 oC. Nevertheless, the work chamber needed to be maintained in vacuum to obtain finer iron-nitride particles. The synthesized particles possessing the core-shell type structure were all nearly spherical and enclosed with Fe3O4 or Fe3O4-related amorphous layer. The iron nanoparticles (~20 nm) synthesized at 600 oC at 760 torr exhibited iHc ~ 1.0 kOe and Ms ~ 170 emu/g, whereas the iron-nitride particles (~20 nm) synthesized at 850 oC at 0.01 torr exhibited iHc ~ 0.45 kOe and Ms ~ 115 emu/g.

Synthesis and Gas Sensitivity of SnO2 Nanoparticles

2011 ◽  
Vol 279 ◽  
pp. 93-96
Author(s):  
Zi Feng Ni ◽  
Guo Mei Chen ◽  
Peng Zhan Ying
Keyword(s):  
Tin Dioxide ◽  
Gas Sensing ◽  
High Sensitivity ◽  
Xrd Analysis ◽  
Sem Analysis ◽  
Gas Sensitivity ◽  
Rutile Structure ◽  
X Ray ◽  
Tetragonal Rutile Structure ◽  
Sensitivity And Selectivity

Tin dioxide (SnO2) nanoparticles have been synthesized in bulk quantity by thermal evaporation of SnO powder. The x-ray powder diffraction (XRD) analysis indicates that the nanoparticles are the tetragonal rutile structure of SnO2. Scanning electron microscopy (SEM) analysis shows that the size of the synthesized SnO2 nanoparticles is relatively homogeneous with diameter of about 10 nm. Gas-sensing components have been manufactured with the SiO2 nanoparticles. Their performances indicate that it has high sensitivity and selectivity to LPG, and the max sensitivity appears at 280°C, compared with C2H5OH, H2, CO and CH4.

Biopolymers with Medical Applications Optimized method for obtaining chitosan-based delivery systems

2018 ◽  
Vol 69 (7) ◽  
pp. 1756-1759 ◽  
Author(s):  
Luminita Confederat ◽  
Iuliana Motrescu ◽  
Sandra Constantin ◽  
Florentina Lupascu ◽  
Lenuta Profire
Keyword(s):  
Drug Delivery ◽  
Drug Delivery Systems ◽  
Average Diameter ◽  
Delivery Systems ◽  
Cross Linking ◽  
Low Molecular Weight ◽  
Polymeric Systems ◽  
Chitosan Microparticles ◽  
Degree Of Swelling

The aim of this study was to optimize the method used for obtaining microparticles based on chitosan � a biocompatible, biodegradable, and nontoxic polymer, and to characterize the developed systems. Chitosan microparticles, as drug delivery systems were obtained by inotropic gelation method using pentasodiumtripolyphosphate (TPP) as cross-linking agent. Chitosan with low molecular weight (CSLMW) in concentration which ranged between 0.5 and 5 %, was used while the concentration of cross-linking agent ranged between 1 and 5%. The characterization of the microparticles in terms of shape, uniformity and adhesion was performed in solution and dried state. The size of the microparticles and the degree of swelling were also determined. The structure and the morphology of the developed polymeric systems were analyzed by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM).The average diameter of the chitosan microparticles was around 522 �m. The most stable microparticles were obtained using CSLMW 1% and TPP 2% or CSLMW 0.75%and TPP 1%. The micropaticles were spherical, uniform and without flattening. Using CSLMW in concentration of 0.5 % poorly cross-linked and crushed microparticles have been obtained at all TPP concentrations. By optimization of the method, stable chitosan-based micropaticles were obtained which will be used to develop controlled release systems for drug delivery.

Isolasi Dan Karakterisasi Bentonit Alam Menjadi Nanopartikel Monmorillonit

2018 ◽  
Vol 3 (1) ◽  
pp. 12 ◽  
Author(s):  
Zaimahwati Zaimahwati ◽  
Yuniati Yuniati ◽  
Ramzi Jalal ◽  
Syahman Zhafiri ◽  
Yuli Yetri
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Particle Size ◽  
Surface Morphology ◽  
Average Diameter ◽  
Particle Size Analyzer ◽  
Ft Ir ◽  
Scanning Electron ◽  
Sedimentation Processes

<p>Pada penelitian ini telah dilakukan isolasi dan karakterisasi bentonit alam menjadi nanopartikel montmorillonit. Bentonit alam yang digunakan diambil dari desa Blangdalam, Kecamatan Nisam Kabupaten Aceh Utara.  Proses isolasi meliputi proses pelarutan dengan aquades, ultrasonic dan proses sedimentasi. Untuk mengetahui karakterisasi montmorillonit dilakukan uji FT-IR, X-RD dan uji morfologi permukaan dengan Scanning Electron Microscopy (SEM). Partikel size analyzer untuk menganalisis dan menentukan ukuran nanopartikel dari isolasi bentonit alam. Dari hasil penelitian didapat ukuran nanopartikel montmorillonit hasil isolasi dari bentonit alam diperoleh berdiameter rata-rata 82,15 nm.</p><p><em>In this research we have isolated and characterized natural bentonite into montmorillonite nanoparticles. Natural bentonite used was taken from Blangdalam village, Nisam sub-district, North Aceh district. The isolation process includes dissolving process with aquades, ultrasonic and sedimentation processes.  The characterization of montmorillonite, FT-IR, X-RD and surface morphology test by Scanning Electron Microscopy (SEM). Particle size analyzer to analyze and determine the size of nanoparticles from natural bentonite insulation. From the research results obtained the size of montmorillonite nanoparticles isolated from natural bentonite obtained an average diameter of 82.15 nm.</em></p>

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