Modified Sol-Gel Processing of NiCr2O4 Nanoparticles; Structural Analysis and Optical Band Gap

AbstractNickel Chromite nanoparticles were successfully synthesized via a modified sol-gel method using nickel acetate and ammonium dichromate in melted stearic acid as a complexing agent. The diffractograms of the nanoparticles confirmed a pure formation of NiCr2O4 spinel without any minor phase. The coordination structure of as prepared nanoparticles shows a series of absorption bands below 1,000 cm−1 were evidenced the M-O (Cr-O, Ni-O) bond in the sample. Optical band gap, magnetic properties and color parameters (L*.a*.b*) indicates that the final nanoparticles are optically and magnetically active. The particle size of NiCr2O4 was calculated using Scherrer equation at about 24 nm. Optical band gap obtained at 1.7 eV indicating that NiCr2O4 nanoparticles are semiconductor material and can be used in electrical devices.

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Morphology and Optical Studies of (1-x)ZnAl2O4 – xSiO2 Thin Films Prepared by Sol-Gel Method

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.895.63 ◽

2014 ◽

Vol 895 ◽

pp. 63-68 ◽

Cited By ~ 2

Author(s):

Mohd Syafiq Zulfakar ◽

Huda Abdullah ◽

Wan Nasarudin Wan Jalal ◽

Sahbudin Shaari ◽

Zainuddin Zalita

Keyword(s):

Thin Film ◽

Particle Size ◽

Band Gap ◽

Optical Band Gap ◽

Sol Gel ◽

Average Particle Size ◽

Average Crystallite Size ◽

Average Particle ◽

Gel Method ◽

Sol Gel Method

The effect of morphological structures and optical band gap of (1-x)ZnAl2O4xSiO2samples with compositions ofx= 0.00, 0.05, 0.10 and 0.15 were prepared by sol-gel method. Spin coating technique was used to deposited the (1-x)ZnAl2O4xSiO2as a thin film and to investigate the structural and optical band gap. The produced thin film samples were annealed at 450 °C for 1h. Field emission scanning electron microscope (FESEM) was used to investigate the surface morphology of the samples. The average particle size for (1-x)ZnAl2O4xSiO2is about 331.23 nm. The particle size are tend to increase as the composition of SiO2increased. XRD analysis shows the formation of cubic structure phase and dominant peak has been observed with Miller Indices (311) plane. The average crystallite size,Dwas calculated with average size about 8 13 nm. The optical band gap was calculated for (1-x)ZnAl2O4xSiO2samples and it was found within range of 3.34 to 3.94 eV.

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Correlation of film thickness to optical band gap of Sol-gel derived Ba0.9Gd0.1TiO3 thin films for optoelectronic applications

EPJ Web of Conferences ◽

10.1051/epjconf/201716201042 ◽

2017 ◽

Vol 162 ◽

pp. 01042

Author(s):

Yen Chin Teh ◽

Ala’eddin A. Saif ◽

Zul Azhar Zahid Jamal ◽

Prabakaran Poopalan

Keyword(s):

Thin Films ◽

Film Thickness ◽

Band Gap ◽

Optical Band Gap ◽

Sol Gel ◽

Optoelectronic Applications

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Synthesis of ZnO and CuO nanoparticles via Sol gel method and Its Characterization by using XRD and FT-IR Analysis

10.21203/rs.3.rs-1234162/v1 ◽

2022 ◽

Author(s):

Monika Patel ◽

Sunita Mishra ◽

Ruchi Verma ◽

Deep Shikha

Keyword(s):

Particle Size ◽

Zno Nanoparticles ◽

Sol Gel ◽

Broad Band ◽

Zinc Nitrate ◽

Zno Nanoparticle ◽

Absorption Bands ◽

Characteristic Absorption ◽

Sol Gel Process ◽

Ft Ir

Abstract Nanotechnology is a completely unique branch of technology that offers with substances in a very small size between (1-100 nm) with various crystal shapes which include spherical nanoparticles, flower shaped, Nano rods, Nano ribbons, and Nano platelets. Metals have ability to produce large number of oxides. These metal oxides play an major role in many areas of chemistry, physics, material science and food science. In this research, Zinc Oxide (ZnO) and Copper (II) oxide nanoparticles were synthesized via sol-gel process using zinc nitrate and copper (II) nitrate as precursor respectively. The characterization of CuO and ZnO nanoparticles was done by using various techniques. X-ray Diffraction (XRD) indicates the crystallinity and crystal size of CuO and ZnO nanoparticle. Fourier transform infrared spectroscopy (FT-IR) was used to get the infrared spectrum of the sample indicating composition of the sample which contains various functional groups. XRD result shows the particle size of CuO at highest peak 29.40140 was 61.25 nm and the particle size of ZnO at highest peak 36.24760 was 21.82 nm. FT-IR spectra peak at 594.56 cm-1 indicated characteristic absorption bands of ZnO nanoparticles and the broad band peak at 3506.9 cm-1 can be attributed to the characteristic absorption of O-H group. The analysis of FT-IR spectrum of CuO shows peaks at 602.09, 678.39, and 730.19cm−1 which refer to the formation of CuO. A broad absorption peak noticed at 3308.2 cm−1 attributed to O–H stretching of the moisture content.

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Nanosized platinum particles by sol-gel processing of tethered metal complexes: influence of the precursors and the organic group removal method on the particle size

New Journal of Chemistry ◽

10.1039/a709224e ◽

1998 ◽

Vol 22 (7) ◽

pp. 721-724 ◽

Cited By ~ 22

Author(s):

Christian Lembacher ◽

Ulrich Schubert

Keyword(s):

Particle Size ◽

Metal Complexes ◽

Sol Gel ◽

Organic Group ◽

Removal Method ◽

Platinum Particles ◽

Gel Processing

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Spectroscopic, Structural, and Morphology of Nickel Oxide Nanoparticles Prepared Using Physalis angulata Leaf Extract

Materials Science Forum ◽

10.4028/www.scientific.net/msf.917.167 ◽

2018 ◽

Vol 917 ◽

pp. 167-171 ◽

Cited By ~ 9

Author(s):

Najmawati Sulaiman ◽

Yoki Yulizar

Keyword(s):

Electron Microscopy ◽

Particle Size ◽

Nickel Oxide ◽

Band Gap ◽

Leaf Extract ◽

Optical Band Gap ◽

Oxide Nanoparticles ◽

Nickel Oxide Nanoparticles ◽

Microscopic Studies ◽

Nio Nps

Green synthesis of nickel oxide nanoparticles (NiO NPs) usingPhysalisangulataleaf extract (PALE) as weak base sources and stabilizing agents has been reported. Chemical bonding and vibration spectroscopy, crystallographic structure, optical band gap, particle size and microscopic studies of NiO NPs were also investigated. Ni-O vibration modes of NiO NPs were analyzed by FTIR and Raman instrument at ~400 and ~900 cm-1wavenumber. XRD pattern of NiO NPs confirmed cubic crystal structure with space groupFm-3m.Optical band gap of NiO NPs determined by using Tauc plot method was about 3.42 eV. Particle size analyzer showed size distribution of NiO NPs was 64.13 nm which confirm NiO formed in nanoscale. Electron microscopic studies of NiO NPs were observed by using scanning electron microscopy and transmission electron microscopy.

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Estimation of band gap and particle size of TiO2 nanoparticle synthesized using sol gel technique

2014 International Conference on Advances in Communication and Computing Technologies (ICACACT 2014) ◽

10.1109/eic.2015.7230747 ◽

2014 ◽

Cited By ~ 3

Author(s):

Manasi Manoj Karkare

Keyword(s):

Particle Size ◽

Band Gap ◽

Sol Gel ◽

Tio2 Nanoparticle ◽

Gel Technique

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INFLUENCE OF ANNEALING TEMPERATURE ON THE CHARACTERISTICS OF NANOCRYSTALLINE SnO2 THIN FILMS PRODUCED BY Sol–Gel AND CHEMICAL BATH DEPOSITION FOR GAS SENSOR APPLICATIONS

Surface Review and Letters ◽

10.1142/s0218625x17501049 ◽

2017 ◽

Vol 24 (07) ◽

pp. 1750104 ◽

Cited By ~ 10

Author(s):

SELMA M. H. AL-JAWAD ◽

ABDULHUSSAIN K. ELTTAYF ◽

AMEL S. SABER

Keyword(s):

Band Gap ◽

Gas Sensor ◽

Chemical Bath Deposition ◽

Annealing Temperature ◽

Optical Band Gap ◽

Sol Gel ◽

Dip Coating ◽

Rutile Structure ◽

Sensor Applications ◽

Average Grain Size

Pure nanocrystalline SnO2 films were grown on a clean glass substrate by using sol–gel dip coating and chemical bath deposition (CBD) techniques for gas sensor applications. The films were annealed in air at 300[Formula: see text]C, 400[Formula: see text]C, and 500[Formula: see text]C for 60[Formula: see text]min. The deposited films with a thickness of approximately 300 [Formula: see text] 20 nm were analyzed through X-ray diffraction, scanning electron microscopy (SEM), atomic force microscopy (AFM), and optical absorption spectroscopy. Results revealed that the films produced by dip coating exhibited a tetragonal rutile structure and those produced by CBD showed a tetragonal rutile and orthorhombic structure. The crystalline sizes of the films produced by dip coating annealed at 300[Formula: see text]C, 400[Formula: see text]C, and 500[Formula: see text]C were 8, 14, and 22.34 nm and those for CBD films at these temperatures were 10, 15, and 22 nm, respectively. AFM and SEM results indicated that the average grain size increased as annealing temperature increased. The transmittance and absorbance spectra were then recorded at wavelengths ranging from 300[Formula: see text]nm to 1000[Formula: see text]nm. The films produced by both the methods yielded high transmission at visible regions. The optical band gap energy of dip-coated films also increased as annealing temperature increased. In particular, their optical band gap energies were 3.5, 3.75, and 3.87[Formula: see text]eV at 300[Formula: see text]C, 400[Formula: see text]C, and 500[Formula: see text]C, respectively. By comparison, the energy band gap of CBD-prepared films decreased as annealing temperature increased, and their corresponding band gaps were 3.95, 3.85, and 3.8[Formula: see text]eV at the specified annealing temperatures. The films were further investigated in terms of their sensing abilities for carbon monoxide (CO) gas at 50 ppm by measuring their sensitivity to this gas at different times and temperatures. Our results demonstrated that dip-coated and CBD-prepared films were highly sensitive to CO at 200[Formula: see text]C and 250[Formula: see text]C, respectively.

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