scholarly journals Influence of annealing temperature on the sensitivity of nickel oxide nanosheet films in humidity sensing applications

2020 ◽  
Vol 18 (1) ◽  
pp. 284
Author(s):  
N. Parimon ◽  
M. H. Mamat ◽  
A. S. Ismail ◽  
I. B. Shameem Banu ◽  
M. K. Ahmad ◽  
...  
Keyword(s):  
Nickel Oxide ◽  
Annealing Temperature ◽  
Sol Gel ◽  
Visible Region ◽  
Annealed Film ◽  
Band Gap Energy ◽  
Humidity Sensing ◽  
Glass Substrates ◽  
Sensing Applications ◽  
Vis Spectroscopy

Nickel oxide (NiO) nanosheet films were successfully grown onto NiO seed-coated glass substrates at different annealing temperatures for humidity sensing applications. NiO seed layers and NiO nanosheet films were prepared using a sol-gel spin coating and sonicated sol-gel immersion techniques, respectively. The properties of NiO nanosheet films at as-deposited, 300 ℃, and 500 ℃-annealed were examined by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), ultraviolet-visible (UV-vis) spectroscopy, and humidity sensor measurement system. The XRD patterns demonstrate that the grown NiO films have crystalline cubic structures at temperature of 300 ℃ and 500 ℃. The FESEM images show that the large porous nanosheet network spread over the layers as the annealing temperature increased. The UV-vis spectra revealed that all the nanosheet films have the average transmittance below than 50% in the visible region, with absorption edges ~ 350 nm. The optical band gap energy was evaluated in ranges of 3.39 to 3.61 eV. From the obtained humidity sensing results, it shows that 500 ℃-annealed film exhibited the best sensitivity of 257, as well as the slowest response time, and the fastest recovery time compared with others.

scholarly journals Annealing temperature dependency of structural, optical and electrical characteristics of manganese-doped nickel oxide nanosheet array films for humidity sensing applications

2021 ◽  
Vol 11 ◽  
pp. 184798042098278
Author(s):  
N Parimon ◽  
MH Mamat ◽  
IB Shameem Banu ◽  
N Vasimalai ◽  
MK Ahmad ◽  
...  
Keyword(s):  
Nickel Oxide ◽  
Measurement System ◽  
Annealing Temperature ◽  
Visible Region ◽  
Immersion Method ◽  
Humidity Sensing ◽  
X Ray ◽  
Nanosheet Array ◽  
Sensing Applications ◽  
Sensing Performance

Manganese-doped nickel oxide nanosheet array films are successfully prepared on a nickel oxide seed-coated glass substrate by an immersion method. Various annealing temperatures between 300°C and 500°C are applied to the manganese-doped nickel oxide nanosheet array films to study their effect on the properties of nickel oxide, including humidity sensing performance. Field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), ultraviolet–visible (UV–vis) spectrophotometry, a two-probe current–voltage ( I- V) measurement system and a humidity measurement system are used to characterise the heat-treated manganese-doped nickel oxide samples. The effect of annealing temperature can be clearly observed for the different surface morphologies and diffraction patterns. The samples exhibit average crystallite size increases of 0.63–10.13 nm with increasing annealing temperature. The dislocation density, interplanar spacing, lattice parameter, unit cell volume and stress/strain are also determined from the XRD data. The average transmittances in the visible region for all samples show low percentages with the highest transparency of 50.7% recorded for manganese-doped nickel oxide annealed at 500°C. The optical band gap shows a decreasing trend with increasing annealing temperature. The I- V measurement results reveal that manganese-doped nickel oxide displays improved conductivity values with increasing annealing temperature. The sensitivity of the humidity sensors shows an ascending curve with increasing temperature. The optimal device performance is obtained with annealing at 500°C, with the highest sensitivity of 270 and the fastest response and recovery times. In contrast, the sample for annealing at 300°C shows poor sensing performance.

scholarly journals THE DETERMINATION OF BARIUM STRONTIUM TITANATE THIN FILM BAND GAP ENERGY Ba0,15Sr0,85TiO3 USING ULTRAVIOLET-VISIBLE SPECTROSCOPY

2020 ◽  
Vol 5 (1) ◽  
pp. 11-20
Author(s):  
Rahmi Dewi ◽  
Krisman Krisman ◽  
Zulkarnaen Zulkarnaen ◽  
Rahmi Afrida Syahraini ◽  
TS Luqman Husein
Keyword(s):  
Thin Film ◽  
Thin Layer ◽  
Strontium Titanate ◽  
Barium Strontium Titanate ◽  
Annealing Temperature ◽  
Sol Gel ◽  
Band Gap Energy ◽  
Barium Strontium ◽  
Vis Spectroscopy ◽  
Bst Thin Film

A thin layer of Barium Strontium Titanate Ba0.15Sr0.85TiO3 (BST) was developed on a glass substrate using a sol-gel method with annealing temperatures and spin coating process at 3500 rpm for 30 seconds. The annealing temperature varied from 600oC, 650oC, and 700oC.  Characterization of optical properties was developed using UV-Vis spectroscopy to determine the energy bandgap. The values of the BST thin layer energy band at the annealing temperature were 3.55 eV, 3.32 eV, and 3.10 eV, respectively. The results indicate that the BST thin film was a semiconductor material.

scholarly journals Effects of Temperature on the Structural and Optical Preperties of AgGaSe2 Thin Films

1970 ◽  
Vol 33 (2) ◽  
pp. 179-188
Author(s):  
MRA Bhuiyan ◽  
DK Saha ◽  
SM Firoz Hasan
Keyword(s):  
Thin Films ◽  
Annealing Temperature ◽  
Visible Region ◽  
Wavelength Region ◽  
Band Gap Energy ◽  
Post Deposition Annealing ◽  
X Ray ◽  
Glass Substrates ◽  
Academy Of Sciences ◽  
Post Deposition

In this study, AgGaSe2 (AGS) thin films were formed onto cleaned glass substrates by using the stacked elemental layer (SEL) deposition technique in vacuum. The films were prepared at the post-deposition annealing temperature from 100 to 350°C for 15 min duration. The atomic composition of the films was measured by energy dispersive analysis of X-ray (EDAX) method. The films ascertain the compositional uniformity. The X-ray diffraction (XRD) has been employed to study the structure of the films. The structures of the films are found to be polycrystalline in nature. The lattice parameters, grain size, strain and dislocation densities of the films were calculated. Optical characteristics of the films were ascertained by spectrophotometer in the photon wavelength ranging between 300 and 2500 nm. The transmittance was found to increase with the increase of annealing temperature. The transmittance falls steeply with decreasing wavelength. It revealed that AGS films have considerable absorption throughout the wavelength region from 400 to 800 nm. The optical band gap energy has been evaluated. Two possible direct allowed and direct forbidden transitions have been observed for all the AGS films in visible region. The former varied from 1.67 to 1.75 eV and the later from 2.05 to 2.08 eV, depending on the post-deposition annealing temperature of the films. DOI: 10.3329/jbas.v33i2.4101 Journal of Bangladesh Academy of Sciences, Vol. 33, No. 2, 179-188, 2009

Optical Studies on the Effect of Different Layers of TiO2 Seeded-Template to the Growth of Nanostructured ZnO

2015 ◽  
Vol 1109 ◽  
pp. 587-592
Author(s):  
N.A.M. Asib ◽  
Aadila Aziz ◽  
A.N. Afaah ◽  
M. Rusop ◽  
Zuraida Khusaimi
Keyword(s):  
Thin Films ◽  
Sol Gel ◽  
Visible Region ◽  
High Ratio ◽  
Structural Defects ◽  
Zno Films ◽  
Zno Nanostructures ◽  
Immersion Method ◽  
Glass Substrates ◽  
Vis Spectroscopy

In this study, Zinc oxide (ZnO) nanostructures have been fabricated on glass substrates coated with Titanium dioxide (TiO2) of different layers, which act as seeded-template, by a solution-immersion method. The substrates were coated with TiO2 by using sol-gel spin coating at five different layers of TiO2: 1, 3, 5, 7 and 9. The effects of the layers to the growth of ZnO nanostructures were observed by using Ultraviolet-Visible (UV-Vis) spectroscopy, Raman spectroscopy and Photoluminescence (PL) spectroscopy. UV-vis spectra of films display the increasing of absorbance properties at visible region as the TiO2 layers increase, as well as at UV region. Meanwhile, at visible region the transparency of TiO2: ZnO films reduce as the layers of TiO2 increase from 1 layer to 9 layers. Raman analysis shows the presence of ZnO in all the TiO2 seeded-templates. From the result, it is confirmed the existence of mixed crystalline structure of both materials in these TiO2: ZnO thin films and PL spectra of the films show seeded TiO2 thin films has lower intensity of visible emission and high ratio of IUV/IVIS compared to the non-seeded TiO2 This contributes to the lower structural defects, oxygen vacancies, impurities and has the most improved optical properties.

Investigation of Chelating Agents on Structural and Optical Properties of Mg(Zr0.05Ti0.95)O3 Thin Film on ITO/Glass Substrate

2013 ◽  
Vol 278-280 ◽  
pp. 393-396
Author(s):  
Ching Fang Tseng ◽  
Chih Wen Lee
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Chelating Agents ◽  
Annealing Temperature ◽  
Sol Gel ◽  
Visible Region ◽  
Secondary Phase ◽  
Structural And Optical Properties ◽  
Glass Substrates ◽  
Ito Glass

Optical properties and microstructures of Mg(Zr0.05Ti0.95)O3 thin films prepared by sol-gel method on ITO/glass substrates at different amount of chelating agents and annealing temperatures have been investigated. The relative intensity ratio values of the peak Mg(Zr0.05Ti0.95)O3 thin films, secondary phase of MgTi2O5 and grain growth were depended on the amount of chelating agents and annealing temperature. In the optical transmission spectra, the Mg(Zr0.05Ti0.95)O3 thin films present high transparency (over 60%) in the visible region of the spectrum. The dependence of the optical properties and microstructure characteristics on thermal treatment was also investigated.

Exploring the characteristics of the nickel oxide nanoparticles via Sol - gel method

2020 ◽  
Vol 3 (3) ◽  
Author(s):  
Jothi M ◽  
Sowmiya K
Keyword(s):  
Nickel Oxide ◽  
Ph Value ◽  
Lattice Structure ◽  
Sol Gel ◽  
Systematic Change ◽  
Average Crystalline Size ◽  
Nio Nanoparticles ◽  
Nickel Oxide Nanoparticles ◽  
X Ray ◽  
Vis Spectroscopy

Nickel Oxide (NiO) is an important transition metal oxide with cubic lattice structure. NiO is thermally stable that is suitable for tremendous applications in the field of optic, ceramic,glass, electro-chromic coatings, plastics, textiles, nanowires, nanofibers, electronics,energy technology, bio-medicine, magnetism and so on. In this present study, NiO nanoparticles were successfully synthesized by sol-gel technique. Nano-sols were prepared by dissolving Nickel-Chloride [NiCl2.6H2O] in NaOH solvent and were converted into nano structured gel on precipitation. A systematic change in preparation parameters like calcination temperature, time, pH value has been noticed in order to predict the influence on crystallite size. Then the prepared samples were characterized by the X-ray Diffraction Spectroscopic (XRD), UV-VIS Spectroscopy, Fourier Transform Infra-Red Spectroscopy (FTIR), Energy Dispersive X-ray Spectroscopy (EDX), Scanning Electron Microscopy (SEM) and Particle Size Analyzer (PSA). From XRD, the average crystalline-size has been calculated by Debye-Scherrer Equation and it was found to be 12.17 nm and the band gap energy of Nickel oxide (NiO) from UV studies reveals around 3.85 eV. Further, EDX and FTIR studies, confirm the presences of NiO nanoparticles. The SEM study exhibits the spherical like morphology of Nickel oxide (NiO). Further from PSA, the mean value of NiO nanoparticles has been determined.

Sol-gel growth of Ni doped CdS on glass substrates: effect of spin coating speed and dopant concentration

2020 ◽  
Vol 10 ◽  
Author(s):  
Atefeh Nazari Setayesh ◽  
Hassan Sedghi
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Spin Coating ◽  
Optical Band Gap ◽  
Dopant Concentration ◽  
Rotation Speed ◽  
Sol Gel ◽  
Band Gap Energy ◽  
Gap Energy ◽  
Glass Substrates

Background: In this work, CdS thin films were synthesized by sol-gel method (spin coating technique) on glass substrates to investigate the optical behavior of the film. Methods: Different substrate spin coating speeds of 2400, 3000, 3600 rpm and different Ni dopant concentrations of 0 wt.%, 2.5 wt.%, 5 wt.%) were investigated. The optical properties of thin films such as refraction index, extinction coefficient, dielectric constant and optical band gap energy of the layers were discussed using spectroscopic ellipsometry method in the wavelength range of 300 to 900 nm. Results: It can be deduced that substrate rotation speed and dopant concentration has influenced the optical properties of thin films. By decreasing rotation speed of the substrate which results in films with more thicknesses, more optical interferences were appeared in the results. Conclusion: The samples doped with Ni comparing to pure ones have had more optical band gap energy.

Preparation and characterization of V2O5 doped SiO2-TiO2 thin films

2012 ◽  
Vol 2 (1) ◽  
Author(s):  
Marek Nocuń ◽  
Sławomir Kwaśny
Keyword(s):  
Thin Films ◽  
Band Gap ◽  
Photoelectron Spectroscopy ◽  
Sol Gel ◽  
Dip Coating ◽  
Band Gap Energy ◽  
Tio2 Thin Films ◽  
Glass Substrates ◽  
Gel Technique

AbstractIn our investigation, V doped SiO2/TiO2 thin films were prepared on glass substrates by dip coating sol-gel technique. Chemical composition of the samples was studied by X-ray photoelectron spectroscopy (XPS). Transmittance of the samples was characterized using UV-VIS spectrophotometry. Subsequently band-gap energy (Eg) was estimated for these films. Powders obtained from sols were characterized by FTIR spectroscopy. It was found that vanadium decreases optical band gap of SSiO2/TiO2 films.

Effect of vacuum annealing on the properties of one step thermally evaporated Sb2S3 thin films for photovoltaic applications

2021 ◽  
Author(s):  
Emna Gnenna ◽  
Naoufel Khemiri ◽  
Minghua Kong ◽  
Maria Isabel Alonso ◽  
Mounir Kanzari
Keyword(s):  
Thin Films ◽  
Annealing Temperature ◽  
Vacuum Annealing ◽  
Xrd Analysis ◽  
Band Gap Energy ◽  
Chemical Compositions ◽  
Optical Parameters ◽  
X Ray ◽  
Vis Spectroscopy ◽  
One Step

Sb2S3 powder was successfully synthesized by solid state reaction technique using high-purity elemental antimony and sulfur. Sb2S3 thin films were deposited on unheated glass substrates by one step thermal evaporation and annealed under vacuum atmosphere for 2 hours at different temperatures 150, 200 and 250 °C. Different characterization techniques were used to better understand the behavior of the Sb2S3 material. X-ray diffraction (XRD) and Raman spectroscopy confirmed the formation of pure Sb2S3 powder with lattice parameters a = 11.07 Å, b = 11.08 Å and c = 3.81 Å. The effect of vacuum annealing temperature on the properties of the films was studied. XRD analysis revealed that as-deposited and annealed films at 150ºC were amorphous in nature whereas those annealed at T ≥ 200°C were polycrystalline with a preferred orientation along (201) plane. The crystallite size of the polycrystalline films showed a decrease from 75.8 to 62.9 nm with the increase of the annealing temperature from 200 to 250 °C. The Raman analysis showed several peaks corresponding to the stibnite Sb2S3 phase. The surface morphology of the films was examined by atomic force microscopy (AFM). The surface roughness decreases slightly as the transformation from the amorphous to the crystalline phase occurs. The chemical compositions of Sb2S3 films were analyzed by energy dispersive X-ray spectroscopy (EDS), revealing that all films were Sb-rich. The optical parameters were estimated from the transmittance and reflectance spectra recorded by UV-Vis spectroscopy. A reduction in the direct band gap energy from 2.12 to 1.70 eV with the increase of annealing temperature was also found.

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