scholarly journals Highly Porous NiO Nanoflower-based Humidity Sensor Grown on Seedless Glass Substrate via One-Step Simplistic Immersion Method

2019 ◽  
Vol 9 (1) ◽  
pp. 5718-5722
Keyword(s):  
Humidity Sensor ◽  
Average Crystallite Size ◽  
Bandgap Energy ◽  
Voltage Measurement ◽  
X Ray Diffraction ◽  
Immersion Method ◽  
Glass Substrates ◽  
Response And Recovery ◽  
One Step ◽  
Highly Porous

A highly porous nickel oxide (NiO) nanoflower was deposited directly onto glass substrates by the simplistic immersion method. The nanostructural property of the NiO was studied by X-ray diffraction pattern and obtained high crystal quality after annealing at 500 °Ϲ with an average crystallite size of 15.5 nm. The optical characterization was measured by ultraviolet-visible spectroscopy, with an average transmittance of 58 %. The value of 3.63 eV was estimated and confirmed as NiO bandgap energy. The current-voltage measurement result indicates that the NiO nanoflower has good electrical properties with resistance, resistivity, and conductivity value of 2.31 MΩ, 2.12 Ω.cm, and 4.71 × 10-1 S.cm-1 , respectively. The NiO is capable of performing satisfactorily as humidity sensor with a sensitivity of 138 with the response and recovery time were estimated at 389 s and 172 s, respectively. Besides, this sensor has stability at a humidity level of 40 - 90% relative humidity.

Chemical synthesis and study of structural and optoelectronic properties of CdS thin films: Effect of SILAR growth cycles

2015 ◽  
Vol 9 (3) ◽  
pp. 2461-2469
Author(s):  
S. R. Gosavi ◽  
K. B. Chaudhari
Keyword(s):  
Thin Films ◽  
Average Crystallite Size ◽  
X Ray Diffraction ◽  
Silar Method ◽  
Growth Cycles ◽  
Glass Substrates ◽  
Layer Adsorption ◽  
Cds Thin Films ◽  
Structural And Optoelectronic Properties ◽  
Deposited Film

CdS thin films were deposited on glass substrates by using successive ionic layer adsorption and reaction (SILAR) method at room temperature. The effect of SILAR growth cycles on structural, morphological, optical and electrical properties of the films has been studied.  The thickness of the deposited film is measured by employing weight difference method. The X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM) studies showed that all the films exhibit polycrystalline nature and are covered well with glass substrates. The values of average crystallite size were found to be 53 nm, 58 nm, 63 nm and 71 nm corresponding to the thin films deposited with 30, 40, 50 and 60 SILAR growth cycles respectively. From the UV–VIS spectra of the deposited thin films, it was seen that both the absorption properties and energy bandgap of the films changes with increasing number of SILAR growth cycles. A decrease of electrical resistivity has been observed with increasing SILAR growth cycle. 

Structural, Morphological, Magnetic and Self-Heating Studies of One-Step Polyol Synthesized Manganese Ferrite (MnFe2O4) Nanoparticles

2019 ◽  
Vol 19 (01) ◽  
pp. 1950003
Author(s):  
P. R. Ghutepatil ◽  
S. H. Pawar
Keyword(s):  
Room Temperature ◽  
Synthesis Method ◽  
Average Crystallite Size ◽  
Superparamagnetic Nanoparticles ◽  
Polyol Synthesis ◽  
X Ray Diffraction ◽  
Self Heating ◽  
Transmission Electron ◽  
One Step ◽  
Mnfe2o4 Nanoparticles

In this paper, uniform and superparamagnetic nanoparticles have been prepared using one-step polyol synthesis method. Structural, morphological and magnetic properties of obtained MnFe2O4 nanoparticles have been investigated by using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscope (FE-SEM), transmission electron microscopy (TEM), vibrating sample magnetometry (VSM) and thermogravimetric analysis (TGA) techniques. Structural investigation showed that the average crystallite size of obtained nanoparticles was about 10[Formula: see text]nm. Magnetic study revealed that the nanoparticles were superparamagnetic at room temperature with magnetization 67[Formula: see text]emu/g at room temperature. The self-heating characteristics of synthesized MnFe2O4 nanoparticles were studied by applying external AC magnetic field of 167.6 to 335.2[Formula: see text]Oe at a fixed frequency of 265[Formula: see text]kHz. The SAR values of MnFe2O4 nanoparticles were calculated for 2, 5, 10[Formula: see text]mg[Formula: see text]mL[Formula: see text] concentrations and it is observed that the threshold hyperthermia temperature is achieved for all concentrations.

Electrodeposition and Properties of CuInS2 Thin Films

2013 ◽  
Vol 690-693 ◽  
pp. 1659-1663
Author(s):  
Hai Fang Zhou ◽  
Xiao Hu Chen
Keyword(s):  
Thin Films ◽  
Photocurrent Density ◽  
Enhancement Effect ◽  
X Ray Diffraction ◽  
X Ray ◽  
Glass Substrates ◽  
Ito Glass ◽  
Type Semiconductor ◽  
One Step ◽  
P Type

The preparation and characterization of CuInS2 thin films on ITO glass substrates prepared by one-step electrodeposition have been reported. Samples were characterized using X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX) and scanning electron microscopy (SEM). The results indicate that CuInS2 is the major phase for the film deposited at -1.0 V, after annealing at 550°C in sulfur atmosphere, and the sample is Cu-rich and p-type semiconductor. Additionally, the energy band gap and carrier concentration for the sample were found to be 1.43 eV and 4.20×1017 cm−3, respectively. Furthermore, the maximum photocurrent density of the sample was found to be -1.15 mA/cm2 under 255 lx illumination, the sample shows the photo-enhancement effect.

scholarly journals Humidity Sensing and Photodetection Based on Tin Disulfide Nanosheets

Crystals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1028
Author(s):  
Der-Yuh Lin ◽  
Hung-Pin Hsu ◽  
Han-Sheng Hu ◽  
Yu-Cheng Yang ◽  
Chia-Feng Lin ◽  
...  
Keyword(s):  
Humidity Sensor ◽  
Electrode Spacing ◽  
X Ray Diffraction ◽  
Humidity Sensing ◽  
X Ray ◽  
Tin Disulfide ◽  
Human Respiration ◽  
Response And Recovery ◽  
H2o2 Oxidation ◽  
Measured Response

Tin disulfide has substantial importance for two-dimensional material-based optoelectronics and sensors due to its unique optoelectrical properties. In this report, we fabricate SnS2 nanosheets using the low-pressure thermal sulfurization process, whose crystal structure and surface morphology are confirmed by X-ray diffraction (XRD) and scanning electron microscope (SEM) measurements. From photoconductivity measurement and photocurrent mapping, we observe smaller electrode spacing of SnS2 thin films can enhance photodetection. Then, by the H2O2 oxidation processing, we transform SnS2 to SnO2 to detect humidity. The measured response and recovery time can be optimized to 5.6 and 1.0 s, respectively, shorter than those of commercial DHT11 humidity sensor of 32 and 34 s. At suitable bias, humidity sensor can detect human respiration properly at room temperature. Our results show that SnS2 nanosheets exhibit reasonable performance for emergent photodetector applications and humidity sensing.

Synthesis and Characterization of Tin Oxide Nanoparticle for Humidity Sensor Applications

2009 ◽  
Vol 4 ◽  
pp. 91-101 ◽  
Author(s):  
T. Krishnakumar ◽  
R. Jayaprakash ◽  
V.N. Singh ◽  
B.R. Mehta ◽  
A.R. Phani
Keyword(s):  
Tin Oxide ◽  
Humidity Sensor ◽  
X Ray Diffraction ◽  
Sensor Applications ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
Response And Recovery ◽  
Ft Ir ◽  
Oxide Nanoparticle

Tin oxide nanoparticle was successfully prepared by the chemical digestion method from the starting material as SnCl2. The SnO2 material was characterized by X-Ray Diffraction (XRD), Transmission Electron Microscope (TEM) and Selected Area Electron Diffraction (SAED). The SnO2 was an n-type material preferred to humidity sensing property towards the moisture. The response and recovery time of sensor was calculated as 129sec and 206sec respectively. It has exhibited better efficiency compared with the bulk SnO2 material. Additional Weight loss, EDS, FT-IR and resistivity measurements were also presented.

scholarly journals HUMIDITY SENSOR USING CuO NANORICES THIN FILM

Anales AFA ◽  
2021 ◽  
Vol 32 (3) ◽  
pp. 76-82
Author(s):  
P.M. Perillo ◽  
◽  
D.F. Rodríguez ◽  
Keyword(s):  
Thin Film ◽  
Humidity Sensor ◽  
Low Cost ◽  
Complex Impedance ◽  
X Ray Diffraction ◽  
Silar Method ◽  
Practical Applications ◽  
Layer Adsorption ◽  
Response And Recovery ◽  
New Generation

In this paper, a humidity sensor based on CuO has been successfully fabricated. Thin-film of CuO nanorices were synthesized by Successive Ionic Layer Adsorption and Reaction (SILAR) method on silicon wafer with Si3N4thinlayer as a substrate. The microstructure and morphology of the samples were investigated using X-ray diffraction(XRD) and scanning electron microscopy (SEM). Humidity sensing properties of the thin films have been studied. The sensing response has been measured in the relative humidity (RH) range from 20 up to 80 % at room temperature. It was found that impedance of the system decreases as the RH was increased. The prepared sensor revealed good reversibility with response and recovery time of 130 s and 320 s respectively. The complex impedance spectra were analyzed in the range of 0.1 to 1 kHz. This type of humidity sensor can be used as a new generation of ecological sensors with low cost and good stability. It makes the sensor a candidate for practical applications.

scholarly journals Fabrication of Cr2O3: ZnO Nanostructure Thin Film Prepared by PLD Technique as NH3 Gas Sensor

2021 ◽  
pp. 2176-2187
Author(s):  
S.M. AbdulKareem ◽  
M.H. Suhail ◽  
I. K. Adehmash
Keyword(s):  
Response Time ◽  
Operating Temperature ◽  
Average Crystallite Size ◽  
X Ray Diffraction ◽  
Gas Sensitivity ◽  
Force Microscopy ◽  
Zno Nanostructure ◽  
Atomic Force ◽  
Recovery Times ◽  
Response And Recovery

     Chromium oxide (Cr2O3) doped ZnO nanoparticles were prepared by pulsed laser deposition (PLD) technique at different concentration ratios (0, 3, 5, 7 and 9 wt %) of ZnO on glass substrate. The effects of ZnO dopant on the average crystallite size of the synthesized nanoparticles was examined By X-ray diffraction. The morphological features were detected using atomic force microscopy (AFM). The optical band gap value was observed to range between 2.78 to 2.50 eV by UV-Vis absorption spectroscopy, with longer wavelength shifted in comparison with that of the bulk Cr2O3 (~3eV). Gas sensitivity, response, and recovery times of the sensor in the presence of NH3 gas were studied and discussed. In the present work, we found that the sensitivity was increased upon increasing the concentration ratio from 3 to 5%wt of ZnO, whereas it was decreased again over that value. Also, we found that the sensitivity was increased when increasing operating temperature, while the response time was decreased. The optimum concentrations ratio for NH3 gas sensitivity at 5%wt ZnO revealed sensitivity of 66.67% and response time of 14s at operating temperature of 300oC and 700mJ PLD energy.

Fabrication and Characterization of CIASSe Thin Film Photovoltaic Absorbers Using CIAS Nanocrystals

2012 ◽  
Vol 512-515 ◽  
pp. 39-42
Author(s):  
Bei Zhu ◽  
Cheng Jun Zhu ◽  
Shan Chang ◽  
Yong Wen Zhang ◽  
Chao Zheng Wang
Keyword(s):  
Thin Film ◽  
Hall Effect Measurement ◽  
Optical Absorption Coefficient ◽  
X Ray Diffraction ◽  
Glass Substrates ◽  
One Step ◽  
Diffraction Peaks ◽  
P Type ◽  
Selenization Temperature

Cu(In0.8Al0.2)(SSe)2 (CIASSe) absorber layers of thin film solar cell were prepared by selenization of Cu(In0.8Al0.2)S2(CIAS) nanocrystals. The CIAS nanocrystals were synthesized by a new solution-based technique and successfully deposited on Mo-coated glass substrates in a one-step process. The phase structure, optical and electrical properties of CIASSe thin films were characterized by power X-ray diffraction (XRD), ultraviolet-visible (UV-Vis) spectrophotometer and the Hall Effect Measurement system. The results showed that single-phase CIASSe solid solution was successfully obtained for a selenization temperature of above 400oC. And the diffraction peaks shifted to the lower angle with an increase in selenization time and selenization temperature. The films selenized at 500oC were found to be p-type and the resistivity was only 0.9484×10-4Ω cm. The optical band gap of the films is 1.508eV and the optical absorption coefficient is over 104cm-1.

scholarly journals Preparation and physical properties of functional barium carbonate nanostructures by a facile composite-hydroxide-mediated route

2018 ◽  
Vol 8 ◽  
pp. 184798041876177 ◽  
Author(s):  
Tauseef Shahid ◽  
Muhammad Arfan ◽  
Aurang Zeb ◽  
Tayyaba BiBi ◽  
Taj Muhammad Khan
Keyword(s):  
Barium Carbonate ◽  
Transition Element ◽  
Average Crystallite Size ◽  
Diagnostic Methods ◽  
Synthesis Process ◽  
Bandgap Energy ◽  
X Ray Diffraction ◽  
Structural And Optical Properties ◽  
Sensor Applications ◽  
Flower Type

Recently, barium carbonate nanomaterial has been shown to be a proven versatile candidate for the catalysis and sensor applications. The catalytic and sensing efficiency can be improved by making barium carbonate composite with a suitable transition element. In this regard, the preparation of barium carbonate and its composite with nickel during the synthesis process is presented with the composite-hydroxide-mediated method, an effective, feasible, and low-temperature synthesis route. The nanomaterial produced is monitored for the structural and optical properties with various diagnostic methods. The X-ray diffraction results show the presence of orthorhombic structure of barium carbonate in both pure and 5% nickel samples. A mixed structure is formed with the phases of barium carbonate, Ba(NO3)2, and Ni(NO3)2 for the sample with 15% nickel. The average crystallite size estimated is in the range of 14–22 nm. The scanning electron microscope pictures captured on silicon (Si) covered with the product material reveal interesting rods, needle, and flower-type morphological features. The bandgap energy obtained by diffused reflectance spectroscopy is in the expected range of 5.48–5.71 eV. The proposed method seems effective to provide a feasible route for the synthesis of a broad range of nanomaterials for research purposes.

Sensing Characteristics of PVA-ZnO/SnO2 Nanocube Humidity Sensor Prepared by Sol-Gel Immersion Technique

2013 ◽  
Vol 832 ◽  
pp. 466-470
Author(s):  
Nor Diyana Md Sin ◽  
M.H. Mamat ◽  
M. Rusop
Keyword(s):  
Room Temperature ◽  
Humidity Sensor ◽  
Sol Gel ◽  
Blue Shift ◽  
Immersion Method ◽  
Current Voltage ◽  
Recovery Times ◽  
Humidity Chamber ◽  
Response And Recovery ◽  
Sensing Characteristics

The effects of polyvinyl alcohol (PVA) loading in ZnO/SnO2 sol-gel immersion method were investigated. The sensor characteristic of in ZnO/SnO2 nanocube was also been tested. The images of sample were carrying out by field emission scanning electron microscopy (FESEM) (JEOL JSM 6700F). The optical properties were characterized using photoluminescent (PL). The thin films were characterized using two point current-voltage (I-V) measurement (Keithley 2400) for electrical properties. The sensor was characterized using I-V measurement in a humidity chamber (ESPEC SH-261) and the chamber has been set at room temperature at 25°C relative humidity (RH %) is varied in the range of 40% to 90 %RH. The FESEM indicate the agglomeration and porous increase as the insertion of PVA into in ZnO/SnO2 nanocube (PVA-ZnO/SnO2 nanocube) compare with the as prepared in ZnO/SnO2 nanocube. PL measurement of PVA-ZnO/SnO2 nanocube describe blue shift behaviour after mixed the PVA. The sensitivity of the sensor of PVA-ZnO/SnO2 nanocube and ZnO/SnO2 nanocube were ratio of current 3.24 times and 12.7 times. While the response and recovery times of PVA-ZnO/SnO2 nanocube higher response and recovery times as compare with ZnO/SnO2 nanocube.

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