Fabrication and Characterization of Polyaniline–ZnO Hybrid Nanocomposite Thin Films

2008 ◽  
Vol 8 (4) ◽  
pp. 1757-1761 ◽  
Author(s):  
Ajeet Kaushik ◽  
Jitendra Kumar ◽  
M. K. Tiwari ◽  
R. Khan ◽  
B. D. Malhotra ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Scanning Electron Microscopy ◽  
Atomic Force Microscopy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force ◽  
Nanocomposite Thin Films ◽  
Scanning Electron

Polyaniline (PANI)–ZnO nanocomposite thin film has been successfully fabricated on glass substrates by using vacuum deposition technique. The as-grown PANI–ZnO nanocomposite thin films have been characterized using X-ray diffraction, Scanning Electron Microscopy, Atomic Force Microscopy, UV-visible spectrophotometer and Fourier Transform Infrared (FTIR) spectroscopy, respectively. X-ray diffraction of as-grown film shows the reflection of ZnO nanoparticles along with a broad peak of PANI. The surface morphology of nanocomposite films has been investigated using scanning electron microscopy and atomic force microscopy. The hypsochromic shift of the UV absorption band corresponding to π–π* transition in polymeric chain of PANI and a band at 504 cm –1 due to ZnO nanoparticles has been observed in the FTIR spectra. The hydrogen bonding between the imine group of PANI and ZnO nanoparticle has been confirmed from the presence of the absorbance band at 1151 cm–1 in the FTIR spectra of the nanocomposite thin films.

Grain Size Effect on Lattice of Ni Nanocrystals Prepared Through Polyol Method

2008 ◽  
Vol 8 (8) ◽  
pp. 4127-4131 ◽  
Author(s):  
G. S. Okram ◽  
Kh. Namrata Devi ◽  
H. Sanatombi ◽  
Ajay Soni ◽  
V. Ganesan ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Atomic Force Microscopy ◽  
Grain Size ◽  
Polyol Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force ◽  
Scanning Electron

Nanocrystalline nickel powders were prepared with grain size 'd' in the range 40–100 nm diameters through polyol method. X-ray diffraction (XRD), scanning electron microscopy (SEM) and atomic force microscopy (AFM) were used for characterization. XRD of the prepared samples consistently matched with standard fcc structure of nickel without any impurity peak. Detailed analysis and calculations using Scherrer equation for (111) peak revealed systematic increase in line width and peak shifting towards lower diffraction 2θ angles with decrease in nickel to ethylene glycol mole ratio. Different values of d estimated from various peaks of each sample suggested associated microstrains in the nanograins. Values of d estimated from X-ray diffraction patterns were compared with those obtained from atomic force microscopy and scanning electron microscopy results, and discussed. Observed lattice expansion is explained, on the basis of a theoretical model of linear elasticity.

scholarly journals SUPERFÍCIES DE TITÂNIO MODIFICADAS POR OXIDAÇÃO À PLASMA EM CÁTODO OCO

2015 ◽  
Author(s):  
Marco Aurélio Medeiros da Silva ◽  
Paulo Victor de Azevedo Guerra ◽  
Ricardo Alexsandro de Medeiros Valentim ◽  
Hélio Roberto Hékis ◽  
Karilany Dantas Coutinho ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Atomic Force Microscopy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force ◽  
Scanning Electron

Uma nova metodologia de oxidação de superfícies de implantes de titânio foi desenvolvida com o intuito de remover previamente os óxidos primários formados espontaneamente durante a usinagem de peças de titânio. Com o objetivo de solucionar esse problema, utilizou-se neste trabalho o plasma como fonte energética tanto na remoção desses óxidos, como na oxidação de superfície de titânio. Nesse sentido, discos de Titânio tiveram seus óxidos previamente removidos por plasma com atmosfera de 50% Ar + 50% H2 seguidos da oxidação pela técnica de descarga por cátodo oco.  A oxidação foi realizada numa mistura de argônio (60%) e oxigênio (40%) até atingir a pressão de 220 Pa durante 60 min a 500°C. Em seguida caracterizou-se as superfícies oxidadas e controle por difração de Rx (X-Ray diffraction), microscopia de força atômica AFM (Atômic Force Microscopy) e microscopia eletrônica de varredura (SEM) (Scanning Electron Microscopy). Resultados obtidos por X-Ray rasante indicou que o processo de remoção dos óxidos foi eficaz, reduzindo TiO2 para Tia.  Com relação ao processo de oxidação, verificou-se que houve um aumento de 61% para 76% na concentração de O2 e a amostra oxidada apresentou-se rica em óxidos como TiO2. Na caracterização por AFM as amostras oxidadas apresentaram defeitos nas superfícies com geometria variada para picos e vales. As diferenças topográficas entre a superfície oxidada e controle são discutidas em termos das dimensões médias dos poros e dos parâmetros de rugosidade Ra, Rp e Rz. Ensaios biológicos foram também realizados com o intuito de observar a adesão e proliferação celular. No SEM observou-se espraiamento celular, uma maior quantidade de projeções de filopódios e diferenças morfológicas nas células das amostras oxidadas em comparação com a amostra controle. Na proliferação celular as células mostraram uma preferência por superfícies oxidadas onde o número de células aderidas foi comparativamente superior, em relação à amostra controle. Concluímos que o processo foi eficiente na remoção dos óxidos primários bem como na oxidação da superfície do titânio.

Nanocomposites Obtained by Montmorilonite Clay Additivation in P3 (HB-8%HV)

2014 ◽  
Vol 775-776 ◽  
pp. 465-470
Author(s):  
Emilene Rita Pimental da Silva ◽  
Ruben Jesus Sanchez Rodriguez ◽  
Flavio Costa Miguens ◽  
Djalma Souza ◽  
Sergio Neves Monteiro ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Atomic Force Microscopy ◽  
Biodegradable Polymer ◽  
X Ray Diffraction ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force ◽  
Evaporation Technique ◽  
Scanning Electron

Modified montmorilonite additivated films of poly 3 (hydroxybutyrateco-8%-hydroxyvalerate) were formulated by solvent evaporation technique and then characterized by means of X-ray diffraction, scanning electron microscopy, atomic force microscopy and scanning differential calorimetry. A preliminary characterization using these analyses revealed the formation of nanocomposites with partially exfoliated and interlayered structures. These nanocamposites display changes in the crystalline structure of the precursor biodegradable polymer.

scholarly journals Study of Structural and Optical Properties of Zinc Oxide Rods Grown on Glasses by Chemical Spray Pyrolysis

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Erdal Sonmez ◽  
Serdar Aydin ◽  
Mehmet Yilmaz ◽  
Mustafa Tolga Yurtcan ◽  
Tevhit Karacali ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Atomic Force Microscopy ◽  
Optical Properties ◽  
Spray Pyrolysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force ◽  
Scanning Electron

We have investigated morphological and optical properties of zinc oxide rods. Highly structured ZnO layers comprising with well-shaped hexagonal rods were prepared by spray pyrolysis deposition of zinc chloride aqueous solutions at ~550∘C. The rods were characterized by X-ray diffraction, scanning electron microscopy, atomic force microscopy, photoluminescence, and ultraviolet and visible absorption spectroscopy measurements. The deposition of the 0.1 mol/L solution at ~550∘C resulted in crystals with a diameter of 400–1000 nm and length of 500–2000 nm. Sharp near-band edge emission peaks, centered at 3844 and 3680 Å, dominated the PL spectra of ZnO at 300 K and 6.2 K, respectively. In addition to this, absorption coefficient was determined by absorption measurement. X-ray diffraction, scanning electron microscopy and atomic force microscopy, results suggest that ZnO rods, prepared by spray pyrolysis, have high crystalline quality. This is desirable in nanotechnology applications.

scholarly journals Subcritical hydrothermal synthesis of amorphous molybdenum disulfide spheres

2020 ◽  
Vol 44 (11-12) ◽  
pp. 738-743
Author(s):  
Hanane Akram ◽  
Ouafae Achak ◽  
Tarik Chafik
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Atomic Force Microscopy ◽  
X Ray Diffraction ◽  
Hydrothermal Route ◽  
One Pot ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force ◽  
Scanning Electron

Amorphous MoS2 spheres with diameters ranging from 150 nm to 1.5 μm are successfully prepared following a reliable one-pot hydrothermal route using a homemade autoclave and inexpensive reactants, at a low temperature (160 °C) and a short reaction time (12 h). The obtained material is comprehensively characterized by X-ray diffraction, scanning-electron microscopy, energy-dispersive X-ray spectroscopy, atomic force microscopy, and infrared spectroscopy. The X-ray diffraction pattern reveals the amorphous structure of the prepared sample without stacking layers, whereas scanning-electron microscopy and atomic force microscopy images indicate the formation of spheres with regular shape and morphology.

Electrical and Structural Properties of ZnO/TiO2 Nanocomposite Thin Films by RF Magnetron Co-Sputtering

2013 ◽  
Vol 667 ◽  
pp. 206-212 ◽  
Author(s):  
I. Saurdi ◽  
Mohamad Hafiz Mamat ◽  
Mohamad Rusop
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Scanning Electron Microscopy ◽  
Atomic Force Microscopy ◽  
Field Emission ◽  
Deposition Time ◽  
Force Microscopy ◽  
Atomic Force ◽  
Nanocomposite Thin Films ◽  
Scanning Electron

In this study, the ZnO/TiO2 nanocomposite thin films were prepared by RF Magnetron co-sputtering ZnO and TiO2 targets at different deposition times from 30-75 minutes. The electrical and structural properties ZnO/TiO2 nanocomposite thin films were characterized by I-V measurement, atomic force microscopy (AFM) and field emission scanning electron microscopy (FE-SEM). The electrical characteristics of nanocomposite films revealed that the conductivity of thin films increases as the thickness increase due to the improvement in surface contact between particles as well as photocatalytic activity. High conductivity at 1.67x10-4 S/cm and lowest resistivity about 5.14x104 Ω/cm were obtained for 75 minutes deposition time. Atomic force microscopy (AFM) showed particle size of ZnO/TiO2 thin films varied from 27nm to 51nm with an increasing in deposition time with granular shapes structures were observed from field emission scanning electron microscopy (FE-SEM).

Wettability and Nanotribological Response of Silicon Surfaces Functionalized by Ion Implantation

2012 ◽  
Vol 730-732 ◽  
pp. 257-262
Author(s):  
Bruno Nunes ◽  
Sergio Magalhães ◽  
Nuno Franco ◽  
Eduardo Alves ◽  
Ana Paula Serro ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Ion Implantation ◽  
Silicon Surfaces ◽  
Iron Ions ◽  
X Ray Diffraction ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force ◽  
Scanning Electron

Aiming to improve the nanotribological response of Si-based materials we implanted silicon wafers with different fluences of iron ions (up to 2x1017 cm-2). Implantation was followed by annealing treatments at temperatures from 550°C to 1000°C. The implanted surfaces were analyzed by scanning electron microscopy (SEM), X-ray diffraction (XRD), atomic force microscopy (AFM) and wettability tests. Then, samples were submitted to AFM-based nanowear tests. We observe an increase of both hidrophobicity and and wear resistance of the implanted silicon, indicating that ion implantation of Si can be a route to be deeper explored in what concerns tribomechanical improvement of Si.

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