scholarly journals Tin DioxideNanostructure Gas Sensor for Acetone and Methanol Detection

2017 ◽  
Vol 27 (4) ◽  
Author(s):  
Osama Abdul Azeez Dakhil ◽  
Raad S. Sabry ◽  
Safaa Farhood Madlul
Keyword(s):  
Tin Dioxide ◽  
Low Cost ◽  
Thick Films ◽  
Horizontal Tube ◽  
Visible Range ◽  
High Porosity ◽  
X Ray ◽  
Uv Visible ◽  
Cost Efficient ◽  
Screen Print

Simple and efficient technique were successfully used to prepare Tin dioxide (SnO2) nanostructure by simple evaporation method, using single stage horizontal tube furnace under atmosphere pressure and quartz tube with Argon flow without additive. SnO2 thick films were synthesized using simple, homemade, low-cost efficient screen print technique. The thick films were heated at 500 0Cfor one hour to vanish the organic material and any residual impurities. The prepared thick films were investigated using different techniques and apparatus, X-Ray and FESEM to study the structural and morphology of the films, the X-ray results show that the films are polycrystalline with sharp and high intensity peaks indicating high crystalinity of the product. The FESEM Images show homogenous nanostructure with high porosity the dimension range 40-70 nm, optical properties was studied with photoluminescence emission (PL) and transmittance in UV-Visible range. SnO2 sensor was built up by electroding the thick films and used for Acetone and methanol detection.

Feasibility of screen-printed PZT microceramics for Structural Health Monitoring piezocomposites applications

2013 ◽  
Vol 2013 (CICMT) ◽  
pp. 000020-000025
Author(s):  
Hélène DEBEDA ◽  
Riadh LAKHMI ◽  
Isabelle FAVRE ◽  
Jonathan ARGILLOS ◽  
Mario MAGLIONE ◽  
...  
Keyword(s):  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Sacrificial Layer ◽  
Low Cost ◽  
Thick Films ◽  
Impedance Analysis ◽  
High Porosity ◽  
Structural Health ◽  
Monitoring Applications ◽  
Screen Printing Technology

Using the association of the low-cost screen-printing technology with the sacrificial layer method, the feasibility of totally released piezoelectric thick-films microceramics of gold electroded PZT type is studied. After the deposition of the sacrificial layer on an alumina substrate and subsequent printing and drying of gold, PZT and gold layers, the final firing is performed at low temperature. This is followed by the releasing step of the Au/PZT/Au in diluted acidic solution. Impedance analysis shows that the electrical properties and electromechanical coefficients of poled PZT thick-films are still lower than those of PZT ceramics. This result is correlated to the high porosity rate of the PZT layer. However these piezoelectric microceramics present a good electromechanical behaviour and can be used as sensors when solicited by vibrations or as actuators to generate vibrations in a structure on which they are bonded. Moreover, the successful fabrication associated to a good electromechanical signature on a metallic test structure suggests Structural Health Monitoring applications.

scholarly journals Study of Band Gap of Silver Nanoparticles—Titanium Dioxide Nanocomposites

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
P. Barone ◽  
F. Stranges ◽  
M. Barberio ◽  
D. Renzelli ◽  
A. Bonanno ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Band Gap ◽  
Chemical Properties ◽  
Photoelectrochemical Cells ◽  
Visible Range ◽  
X Ray ◽  
Optical Absorbance ◽  
Laser Ablation Process ◽  
Uv Visible ◽  
And Chemical Properties

The optical and chemical properties of Ag/TiO2nanocomposites were investigated to explore the possibilities of incorporating these new materials in Gratzel photoelectrochemical cells. The nanocomposites were obtained doping TiO2, in both allotropic species anatase and rutile, with silver nanoparticles (grown by laser ablation process). X-ray photoelectron data indicate the absence of Ag-Ti chemical bonds, while measurements of photoluminescence and optical absorbance in UV-visible range show a quench in photoluminescence emission of about 50% and an increase in visible absorbance of about 20%. Measurements of optical band gap, obtained by Tauc’s equation, indicate a variation of about 1.6 eV.

Mythology Merges with Technology for Majestic Production of Silver Nanoparticles: Rudraksha Enabled

2012 ◽  
Vol 585 ◽  
pp. 144-148
Author(s):  
Poushpi Dwivedi ◽  
S.S. Narvi ◽  
R.P. Tewari
Keyword(s):  
Silver Nanoparticles ◽  
Vital Role ◽  
Environmentally Benign ◽  
Size Analysis ◽  
Visible Spectroscopy ◽  
Efficient Manner ◽  
X Ray ◽  
Transmission Electron ◽  
Uv Visible ◽  
Cost Efficient

In this nanoregime attempts to bring forth nanoparticles and nanomaterials are myriads, with there interesting and demanding applications in almost every field. Today the field of nanoscience has bloomed with the confluence of nanotechnology with material science, biology, biotechnology and medicine and the need for nanotechnology will only increase as miniaturization becomes extremely important in various arrays of life. Since time immemorial silver nanoparticles have been extensively used for hygienic and healing purposes, and even until most recently, it has indispensible vital role especially in the biomedical arena. Thus in an attempt to generate silver nanoparticles employing green, environmentally benign route, we have designed to converge mythology with technology, with the mystical production of silver nanoparticles, enabled by the blueberry beads of the plant Elaeocarpus granitrus Roxb., the Rudraksha. This non-degradable bead does not disintegrate, but retains the potentiality, even after unlimited production of silver nanoparticles, assisting infinite times. The extremely cost-efficient nanoparticles thus developed in a superiorly efficient manner were characterized through different techniques; like UV/visible spectroscopy, PL spectroscopy, transmission electron microscopy, energy dispersive X-ray analysis and nanoparticle size analysis.

scholarly journals BIOSYNTHESIS OF SILVER NANOPARTICLES USING MARINE MICROALGAE ISOCHRYSIS sp.

2017 ◽  
Vol 2 (1) ◽  
pp. 1-12
Author(s):  
Tevan R ◽  
Saravanan Jayakumar ◽  
Nor Haledah Ahmad Sahimi ◽  
Nur Farah Ain Iqbal ◽  
Iffah Zapri ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Metal Nanoparticles ◽  
Low Cost ◽  
Spherical Shape ◽  
Antimicrobial Activities ◽  
Marine Microalgae ◽  
X Ray ◽  
Potential Applications ◽  
Uv Visible ◽  
193 Nm

Biosynthesis of metal nanoparticles has received a remarkable attention due to their eco-friendly and potential applications in pharmaceutical and medical fields. The searches for natural alternatives to replace biosynthetic nanoparticles have resulted in extensive studies of microalgal derived metal nanoparticles. Since there are very limited reports on Isochrysis sp. in synthesising metal nanoparticles, a novel initiative was taken to induce an environmentally friendly and low cost technique to biosynthesise the silver nanoparticles (AgNPs) using marine microalgae, Isochrysis sp. Further, the synthesised silver nanoparticles were screened against human pathogen for antimicrobial effects. The characterisation of nanoparticles were confirmed by UV visible spectroscopy, field emission scanning electron microscopy (FESEM), Fourier transform infrared spectroscopy (FTIR), and X-ray powder diffraction (XRD). The results obtained from characterisations indicate that the AgNPs have an almost spherical shape with a various size of 98.1 to 193 nm. The synthesised nanoparticles exhibited outstanding antioxidant and antimicrobial activities.

scholarly journals Study of Structural and Optical Properties of Fe2+ Doped Tin Oxide Nanoparticles

2019 ◽  
Vol 8 (1) ◽  
pp. 8-12 ◽  
Author(s):  
K Sreekar Reddy ◽  
S. Nithiyanantham ◽  
G. Geetha ◽  
R. Annie Sujatha ◽  
S. Mahalakshmi
Keyword(s):  
Tin Dioxide ◽  
Sol Gel ◽  
Ammonium Hydroxide ◽  
Chemical Compositions ◽  
X Ray Diffraction ◽  
Structural And Optical Properties ◽  
X Ray ◽  
Uv Visible ◽  
Tin Oxide Nanoparticles ◽  
Conduction Properties

Tin dioxide nanoparticles (SnO2) were synthesized by a sol-gel method. And tin tetra chloride (SnCl4) and ammonium hydroxide (NH4OH) were used as the precursor. NH4OH maintain the homogeneity and stoichiometry of solution through pH. The obtained powder subjected to calcination about 110oC. The obtained samples are characterized by X-ray diffraction, Scanning electron microscope, Fourier transform infrared spectroscope and UV-Visible spectroscopy. From the characterizations it is confirmed that the tetragonal structure and the particles are small and nanosizes, The O-H stretching and C=C bending stretching with chemical compositions are analyzed. The improved conduction properties through lower bandgap and the results are further interpreted and discussed.

Application of Acacia modesta and Dalbergia sissoo gums as green matrix for silver nanoparticle binding

2016 ◽  
Vol 5 (1) ◽  
Author(s):  
Hira Munir ◽  
Muhammad Shahid ◽  
Fozia Anjum ◽  
Muhammad Nadeem Akhtar ◽  
Sayed M. Badawy ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Low Cost ◽  
Dalbergia Sissoo ◽  
Visible Spectroscopy ◽  
Green Matrix ◽  
Gram Negative ◽  
Gram Positive Bacteria ◽  
Uv Visible ◽  
Cost Efficient

AbstractA low-cost, efficient, and ecofriendly method for the synthesis of silver nanoparticles (AgNPs) using gums as reducing agent was performed. The obtained nanoparticles were characterized by UV-visible spectroscopy. The antibacterial activity of the prepared nanoparticles was tested against Gram-negative and Gram-positive bacteria. The

An electrochemical cell for operando bench-top X-ray diffraction

2019 ◽  
Vol 52 (2) ◽  
pp. 485-490 ◽  
Author(s):  
Jonas Sottmann ◽  
Valérie Pralong ◽  
Nicolas Barrier ◽  
Christine Martin
Keyword(s):  
Electrochemical Cell ◽  
Low Cost ◽  
Lithium Ion ◽  
X Ray Diffraction ◽  
Two Phase ◽  
X Ray ◽  
Cost Efficient ◽  
Battery Technology ◽  
Solution Behaviour

An X-ray transparent electrochemical cell for operando bench-top X-ray diffraction in reflection geometry is presented. Dense glassy carbon (Sigradur-G) is used as an X-ray transparent window. The cell and dedicated sample holder are easy to handle and cost efficient thanks to their simple designs. To demonstrate the performance of this new Swagelok-type operando cell, diffractograms were collected during cycling of the cathode material Li x Mn2O4 (x ≤ 1) in a lithium-ion battery. During charging/delithiation, three spinel phases with evolving lattice parameters were found. This observation confirms the expected mixed two-phase and solid-solution behaviour and thereby validates our experimental setup. The presented low-cost setup may enable further battery research units to access operando X-ray diffraction data for characterization of structural phenomena during battery cycling and degradation mechanisms during prolonged cycling, which will lead to improvement of the battery technology.

Study of microstructural, morphological and optical properties of sprayed vanadium doped ZnO nanoparticles

2019 ◽  
Vol 87 (1) ◽  
pp. 10301 ◽  
Author(s):  
Hajar Ftouhi ◽  
Zouhair El Jouad ◽  
Mohammed Jbilou ◽  
Mustafa Diani ◽  
Mohammed Addou
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Low Cost ◽  
Band Gap Energy ◽  
Visible Range ◽  
Sem Images ◽  
Optical Window ◽  
X Ray ◽  
Glass Substrates ◽  
Average Transmittance

In this paper, transparent conducting thin films based on both undoped and vanadium (V) doped zinc oxide Zn1−xVx O (x = 3, 5, 7 at.%), were studied. The thin films were prepared using a simple low cost deposition technique called spray pyrolysis (SP). The layers were deposited onto preheated glass substrates at 450 °C. The effect of vanadium on the microstructural, the morphological and the optical properties of ZnO material was carried out using X-ray diffractometer (XRD), micro Raman spectroscope, scanning electron microscope (SEM), energy dispersive analysis by X-ray (EDX) and UV-Vis-NIR spectrophotometer. We have demonstrated that doping with 3 at.% of V enhances the crystallinity of the films by estimating the grain size value, the dislocation density and the residual stress. Also, the SEM images have demonstrated that the vanadium concentrations do effect in the thin films morphology, from hexagonal-shaped grains to rounded crystals for higher doping concentrations. The optical analysis revealed that doping with 3 at.% of vanadium shows a remarkable enhancement in the average transmittance in the visible range 89% and in the band gap energy (3.3 eV). Moreover, the disorder inside the samples was estimated using Urbach equation. Therefore, the microstructural, the morphological and the optical results approve that doping with 3 at.% of V in ZnO lattices gives interesting results for the optical window material for solar cells application.

Electrophoretic Deposition of Ferroelectric Composites for Applications in Electronic Scanning Systems

2000 ◽  
Vol 655 ◽  
Author(s):  
E. Ngo ◽  
P.C. Joshi ◽  
M. W. Cole ◽  
C. W. Hubbard
Keyword(s):  
Electrophoretic Deposition ◽  
Dispersive Medium ◽  
Low Cost ◽  
Thick Films ◽  
Low Frequency ◽  
X Ray Diffraction ◽  
X Ray ◽  
Barium Strontium ◽  
Conformal Method ◽  
Scanning Systems

AbstractWe have investigated the electrophoretic deposition (EPD) as a low cost and conformal method of fabricating barium strontium titanium (BST) based composite thick films. The films were deposited at a controlled rate on platinum substrate in acetone-based slurry under electric bias. Acetone-aerosol OTS surfactant dispersion was used as dispersive medium. Conformal BST based thick films of 10-80 μm were obtained. The dielectric constant and dielectric loss factor of Ba0.60Sr0.40TiO3 and Ba0.60Sr0.40TiO3 – 20wt% compositions were 603.3 and 0.029 and 327.0 and 0.002, respectively. The low frequency electronic properties of the electrophoretic films were also compared with those of the bulk BST ceramics. In addition, the optical and the structural properties of the films are also discussed. The various techniques employed include x-ray diffraction, SEM and surface profilometer.

Synthesis of Epoxy-Functionalized Micro-Zone Plates by UV-Initiated Copolymerization

2014 ◽  
Vol 618 ◽  
pp. 125-130
Author(s):  
Li Li ◽  
He Ye Wang
Keyword(s):  
Low Cost ◽  
Wet Etching ◽  
Visible Range ◽  
Regulatory Requirement ◽  
X Ray ◽  
Zone Plates ◽  
Fabrication Procedure ◽  
Group Reaction ◽  
Facile Fabrication ◽  
Epoxy Groups

As microfluidic systems transition from research tools to disposable clinical devices, new substrate materials are need to meet both the regulatory requirement as well as the economics of disposable devices. In this paper, a commercial ultraviolet (UV)-curiable material (bisphenol A based epoxy acrylate, BABEA) was introduced as a new manufacturing material for facile fabrication of epoxy-functionalized microfluidic devices by UV-initiated copolymerization. X-ray photoelectron spectroscope (XPS) results indicated the existence of epoxy groups on the surface of poly (BABEA-co-GMA), which allowed for binding protein through an epoxy-amino group reaction. Poly (BABEA-co-GMA) is highly transparent in visible range, and of high replication fidelity. A fabrication procedure was proposed for manufacturing BABEA based epoxy-functionalized micro-zone plates. The fabrication procedure was very simple; obviating the need of micromachining equipments, wet etching or imprinting techniques. To evaluate the BABEA based epoxy-functionalized micro-zone plates, α-fetoprotein (AFP) antibody was immobilized onto the capture zone for chemiluminescent (CL) detection in a non-competitive immune response format. The proposed AFP immunoaffinity micro-zone plate was demonstrated as a low cost, flexible, homogeneous and stable assay for AFP.

Sign in / Sign up

Export Citation Format

Share Document