Facial synthesis of hexagonal metal oxide nanoparticles for low temperature ammonia gas sensing applications

RSC Advances ◽  
2015 ◽  
Vol 5 (6) ◽  
pp. 4135-4142 ◽  
Author(s):  
Ishpal Rawal
Keyword(s):  
Gas Sensing ◽  
Metal Oxide Nanoparticles ◽  
Hydrothermal Process ◽  
Oxide Nanoparticles ◽  
X Ray Diffraction ◽  
Wurtzite Phase ◽  
Ammonia Gas ◽  
X Ray ◽  
Sensing Applications ◽  
Surfactant Assisted

A surfactant assisted facial hydrothermal process has been employed for the synthesis of rutile and wurtzite phase SnO2 and ZnO nanoparticles, respectively, confirmed by X-ray diffraction studies.

scholarly journals Impact of Nanosized CuO Insertion on Structural and Mechanical Properties of PVA: HPMC Based Polymer Blend Nanocomposites

2021 ◽  
Vol 33 (10) ◽  
pp. 2287-2292
Author(s):  
K. Vijayashree ◽  
K. Sheshappa Rai
Keyword(s):  
Mechanical Properties ◽  
Metal Oxide Nanoparticles ◽  
Hydroxypropyl Methylcellulose ◽  
Cuo Nanoparticles ◽  
Oxide Nanoparticles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Uv Visible ◽  
Blend Nanocomposites ◽  
Scanning Electron

Insertion of metal-oxide nanoparticles to polymers stipulate the modification of physical properties of polymers over and above the accomplishment of new features in the polymer matrix. In the current study, an attempt was made to disperse the CuO nanoparticles in the polyvinyl alcohol and hydroxypropyl methylcellulose (HPMC) blend to investigate the structural, mechanical and optical properties of the nanocomposite. Blend was prepared in different ratios using PVA and HPMC, viz. 25:50, 50:50 and 75:25 wt%. The CuO nanoparticles were added to the 75:25 PVA:HPMC blend in different percentage like 0.5,1 and 1.5%. The polymer with and without CuO incorporation were subjected to X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, UV-visible spectral analyses and mechanical strength, etc. The results revealed that the incorporation of the CuO nanoparticles enhanced the structural and mechanical properties of the polymer by forming successful nanocomposite.

Mechanochemical Synthesis of Novel Sensor Materials

2009 ◽  
Vol 1226 ◽  
Author(s):  
Monica Sorescu ◽  
Lucian Diamandescu ◽  
Adelina Tomescu
Keyword(s):  
Ball Milling ◽  
Milling Time ◽  
Gas Sensing ◽  
Mechanochemical Activation ◽  
Magnetic Characteristics ◽  
X Ray Diffraction ◽  
Recoilless Fraction ◽  
X Ray ◽  
Immiscible System ◽  
Sensing Applications

AbstractThe xZnO-(1-x)alpha-Fe2O3 and xZrO2-(1-x)alpha-Fe2O3 nanoparticles systems have been obtained by mechanochemical activation for x=0.1, 0.3 and 0.5 and for ball milling times ranging from 2 to 24 hours. Structural and magnetic characteristics of the zinc and zirconium-doped hematite systems were investigated by X-ray diffraction (XRD), Mössbauer spectroscopy and conductivity measurements. Using the dual absorber method, the recoilless fraction was derived as function of ball milling time for each value of the molar concentration involved. As ZnO is not soluble in hematite in the bulk form, the present study clearly illustrates that the solubility limits of an immiscible system can be extended beyond the limits in the solid state by mechanochemical activation. Moreover, this synthetic route allowed us to reach nanometric particle dimensions, which makes these materials very important for gas sensing applications.

Synthesis of Copper Nanospindles and Microflowers via a Surfactant-Assisted Hydrothermal Process

2013 ◽  
Vol 815 ◽  
pp. 469-472
Author(s):  
Jun Jie Jing ◽  
Ji Min Xie ◽  
Gao Yuan Chen ◽  
Wen Hua Li ◽  
Ming Mei Zhang
Keyword(s):  
Cetyltrimethylammonium Bromide ◽  
Growth Process ◽  
Hydrothermal Process ◽  
Solution Phase ◽  
Sodium Ascorbate ◽  
Cu Nanoparticles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cu Nanostructures ◽  
Surfactant Assisted

A facile solution-phase process has been demonstrated for the selective preparation of single-crystalline Cu nanospindles and microflowers by reducing Cuprous iodide (CuI) with Sodium ascorbate (VCNa) in the presence of Pluronic F-127(F-127) or cetyltrimethylammonium bromide (CTAB). The product was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM). To study the formation process of Cu nanoparticles, samples obtained at various stages of the growth process were studied by XRD. UV-vis spectra of the Cu nanospindles and microflowers were recorded to investigate their optical properties, which indicated that as-prepared Cu nanostructures exhibited morphology-dependant optical property.

scholarly journals Synthesis and Characterization of Nano-Tungsten Oxide Precipitated onto Natural Inorganic Clay for Humidity-Sensing Applications

Ceramics ◽  
2018 ◽  
Vol 1 (1) ◽  
pp. 120-127 ◽  
Author(s):  
Ahmed Afify ◽  
Ahmed Elsayed ◽  
Mohamed Hassan ◽  
Mohamed Ataalla ◽  
Amr Mohamed ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Tungsten Oxide ◽  
Diffraction Field ◽  
Oxide Nanoparticles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sensing Applications ◽  
Transmission Electron ◽  
Tungsten Oxide Nanoparticles ◽  
Inorganic Clay

A wet chemical method was used to obtain tungsten oxide nanoparticles from tungsten tetrachloride and natural microfibrous inorganic clay (sepiolite) as a starting material. Precipitation of tungsten oxide species onto sepiolite under basic conditions and subsequent thermal treatment was investigated, prompted by the abundance of sepiolite in nature and the useful environmental applications that could be attained. Laser granulometry, X-ray diffraction, field emission scanning electron microscopy (FE-SEM), energy dispersive X-ray spectroscopy (EDX), and high-resolution transmission electron microscopy (HR-TEM) techniques were used to study the particle-size distribution, the morphology, and the composition of the prepared sample. Our findings show the presence of tungsten oxide nanoparticles, which are less than 50 nm, on the needles of the modified sepiolite.

Synthesis of Copper Nanohexagons and Microflowers via a Surfactant-Assisted Hydrothermal Process

2013 ◽  
Vol 785-786 ◽  
pp. 420-423
Author(s):  
Jun Jie Jing ◽  
Ji Min Xie ◽  
Gao Yuan Chen ◽  
Wen Hua Li ◽  
Ming Mei Zhang
Keyword(s):  
Hydrothermal Process ◽  
Sodium Ascorbate ◽  
Ammonium Bromide ◽  
Cu Nanoparticles ◽  
X Ray Diffraction ◽  
Cetyltrimethyl Ammonium Bromide ◽  
X Ray ◽  
Cetyltrimethyl Ammonium ◽  
Cu Nanostructures ◽  
Surfactant Assisted

A facile solution-phase process has been demonstrated for the selective preparation of single-crystalline Cu hexagons and flowers by reducing Cuprous iodide (CuI) with Sodium ascorbate (VCNa) in the presence of cetyltrimethyl ammonium chloride (CTAC) or cetyltrimethyl ammonium bromide (CTAB). The product was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM). To study the formation process of Cu nanoparticles, samples obtained at various stages of the growth process were studied by XRD. UV-vis spectra of the Cu hexagons and flowers were recorded to investigate their optical properties, which indicated that as-prepared Cu nanostructures exhibited morphology-dependant optical property.

scholarly journals Characterization of CuO thin films for gas sensing applications

2019 ◽  
Vol 14 (31) ◽  
pp. 1-12
Author(s):  
Jamal M. Rzaij
Keyword(s):  
Room Temperature ◽  
Gas Sensing ◽  
Cupric Oxide ◽  
Laser Pulses ◽  
X Ray Diffraction ◽  
Energy Increase ◽  
Nano Structure ◽  
X Ray ◽  
Sensing Applications

Nanostructural cupric oxide (CuO) films were prepared on Si and glass substrate by pulsed laser deposition technique (PLD) using laser Nd:YAG, using different laser pulses energies from 200 to 600 mJ. The X-ray diffraction pattern (XRD) of the films showed a polycrystalline structure with a monoclinic symmetry and preferred orientation toward (111) plane with nano structure. The crystallite size was increasing with increasing of laser pulse energy. Optical properties was characterized by using UV–vis spectrometer in the wave lengthrange (200-1100) nm at room temperature. The results showed that the transmission spectrum decreases with the laser pulses energy increase. Sensitivity of NO2 gas at different operating temperatures, (50°C, 100°C, 150°C and 200°C) was calculated.

scholarly journals Mg-doped and chemo-thermally treated ZnO nanoflowers for ethanol sensing

2021 ◽  
Author(s):  
Santanu Maity ◽  
P.P Sahu ◽  
Tiju Thomas
Keyword(s):  
Gas Sensing ◽  
Morphological Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sensing Applications ◽  
Wide Range ◽  
Doped Zno ◽  
Ethanol Sensing ◽  
Better Than ◽  
Mg Doped

Abstract ZnO nanostructures are promising for a wide range of applications, including gas sensors. Ethanol sensing using ZnO remains unexplored though. In this paper, we report ethanol-sensing using un-doped ZnO nano flowers and Mg doped ZnO nano flowers. These are grown using a rather simple chemo-thermal process, making this a plausibly scalable technology. To study the structural and morphological properties of undoped ZnO and Mg doped ZnO nanoflowers, Raman spectroscopy, Fourier Transform Infrared Spectroscopy (FTIR), x-ray diffraction and Field Emission Scanning Electron Microscopy (FESEM) are carried out. Ethanol sensing properties of undoped ZnO and Mg doped ZnO nanoflower devices are investigated toward different ethanol concentration (concentration range of 1–600 ppm at 100°C–200°C). Our findings show that 15% Mg doped ZnO nano flower is better than ZnO nano flower for ethanol gas-sensing applications.

W–Ti–O layers for gas-sensing applications: Structure, morphology, and electrical properties

1998 ◽  
Vol 13 (6) ◽  
pp. 1568-1575 ◽  
Author(s):  
L. Sangaletti ◽  
E. Bontempi ◽  
L. E. Depero ◽  
R. Salari ◽  
M. Zocchi ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Gas Sensing ◽  
Phase Segregation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sensing Applications ◽  
Structure Morphology ◽  
Structural And Electrical Properties ◽  
Kinetics Of ◽  
Structurally Stable

The kinetics of phase transitions and phase segregation induced by annealing temperature on the Ti–W–O gas-sensing layer was studied by x-ray diffraction, Raman spectroscopy, and scanning electron microscopy. The main goal was to identify, on the basis of kinetics studies, structurally stable Ti–WO3 thin film phases and compare their response to polluting gases in order to determine possible correlations between structural and electrical properties of the sensing layers.

scholarly journals Structural and morphological tuning of Cu-based metal oxide nanoparticles by a facile chemical method and highly electrochemical sensing of sulphite

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Velayutham Sudha ◽  
Govindhasamy Murugadoss ◽  
Rangasamy Thangamuthu
Keyword(s):  
Crystal Structures ◽  
Chemical Method ◽  
Metal Oxide Nanoparticles ◽  
Modified Electrodes ◽  
Electrochemical Sensing ◽  
Oxide Nanoparticles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
One Step

AbstractA facile one-step chemical method is introduced for the successful synthesis of Cu2O, CuO and CuNa2(OH)4 crystal structures and their electrochemical properties were also investigated. X-ray diffraction studies revealed that these copper-based oxide nanoparticles display different crystal structures such as cubic (Cu2O), monoclinic (CuO) and orthorhombic [CuNa2(OH)4]. The microstructural information of nanoparticles was investigated by transmission electron microscopy. It shows attractive morphologies of different orientation such as rod like structure, nanobeads and well-aligned uniform nanorod for Cu2O, CuO and CuNa2(OH)4, respectively. Electrochemical sensing of sulphite (SO32−) on these three copper-based oxide modified electrodes was investigated. Among the three different crystal structures, CuO shows promising electrocatalytic activity towards oxidation of sulphite. A linear variation in peak current was obtained for SO32− oxidation from 0.2 to 15 mM under the optimum experimental condition. The sensitivity and detection limit were in the order of 48.5 µA cm−2 mM−1 and 1.8 µM, respectively. Finally, practical utility of CuO modified electrode was demonstrated for the estimation of sulphite in commercial wine samples.

Multiwall Carbon Nanotubes Decorated with Metal Oxide Nanoparticles for Gas Sensing Applications

2019 ◽  
Vol 23 (1) ◽  
pp. 237-242 ◽  
Author(s):  
Rogerio V. Gelamo ◽  
Ali Abbaspourrad ◽  
C. Verissimoa ◽  
Alfredo R. Vaz ◽  
F. P. Rouxinol ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Metal Oxide ◽  
Gas Sensing ◽  
Metal Oxide Nanoparticles ◽  
Multiwall Carbon Nanotubes ◽  
Oxide Nanoparticles ◽  
Sensing Applications ◽  
Multiwall Carbon
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