Gas Sensor Properties of ZnO Nanorods Grown by Chemical Bath Deposition

2014 ◽  
Vol 975 ◽  
pp. 189-193 ◽  
Author(s):  
Gisane Gasparotto ◽  
Talita Mazon ◽  
Gisele Gasparotto ◽  
Maria Aparecida Zaghete ◽  
Leinig Antonio Perazolli ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Chemical Bath Deposition ◽  
Gas Sensors ◽  
Au Nanoparticles ◽  
Gas Sensing ◽  
Zno Nanorods ◽  
X Ray Diffraction ◽  
X Ray ◽  
Type Semiconductor ◽  
Sensor Properties

The present work shows a study about the growing of ZnO nanorods by chemical bath deposition (CBD) and its application as gas sensor. It was prepared ZnO nanorods and Au decorated ZnO nanorods and the samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and gas sensing response measurements. The results obtained by XRD show the growth of ZnO phase. It was possible to observe the formation of uniform dense well-aligned ZnO nanorods. The results obtained also revealed that Ag nanoparticles have decorated the surface of ZnO nanorods successfully. Au nanoparticles with diameter of a few nanometers were distributed over the ZnO surface nanorods. The gas sensing response measurements showed a behavior of n type semiconductor. Furthermore, the Au-functionalized ZnO nanorods gas sensors showed a considerably enhanced response at 250 and 300 °C.

scholarly journals CH3SH and H2S Sensing Properties of V2O5/WO3/TiO2 Gas Sensor

Chemosensors ◽  
2021 ◽  
Vol 9 (5) ◽  
pp. 113
Author(s):  
Takafumi Akamatsu ◽  
Toshio Itoh ◽  
Akihiro Tsuruta ◽  
Yoshitake Masuda
Keyword(s):  
Hydrogen Sulfide ◽  
Vanadium Oxide ◽  
Gas Sensor ◽  
Gas Sensors ◽  
Oxide Content ◽  
Methyl Mercaptan ◽  
X Ray Diffraction ◽  
X Ray ◽  
Pt Electrodes ◽  
Type Semiconductor

Resistive-type semiconductor-based gas sensors were fabricated for the detection of methyl mercaptan and hydrogen sulfide. To fabricate these sensors, V2O5/WO3/TiO2 (VWT) particles were deposited on interdigitated Pt electrodes. The vanadium oxide content of the utilized VWT was 1.5, 3, or 10 wt.%. The structural properties of the VWT particles were investigated by X-ray diffraction and scanning electron microscopy analyses. The resistance of the VWT gas sensor decreased with increasing methyl mercaptan and hydrogen sulfide gas concentrations in the range of 50 to 500 ppb. The VWT gas sensor with 3 wt.% vanadium oxide showed high methyl mercaptan and hydrogen sulfide responses and good gas selectivity against hydrogen at 300 °C.

A Novel Tungsten Trioxide Based Gas Sensor for Indoor Formaldehyde Detection

2021 ◽  
Vol 16 (3) ◽  
pp. 363-367
Author(s):  
Gaoqi Zhang ◽  
Fan Zhang ◽  
Kaifang Wang ◽  
Tao Tian ◽  
Shanyu Liu ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Gas Sensor ◽  
Indoor Air ◽  
Gas Sensing ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sensing Material ◽  
Transmission Electron ◽  
Gas Sensing Properties ◽  
Gas Response

Accurate and real-time detection of formaldehyde (HCHO) in indoor air is urgently needed for human health. In this work, a ceramic material (WO3·H2O) with unique structure was successfully prepared using an efficient hydrothermal method. The crystallinity, morphology and microstructure of the as-prepared sensing material were analyzed by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM) as well as transmission electron microscope (TEM). The characterization results suggest that the as-prepared sample is composed of square-like nanoplates with uneven surface. Formaldehyde vapor is utilized as the target gas to investigate gas sensing properties of the synthesized novel nanoplates. The testing results indicate that the as-fabricated gas sensor exhibit high gas response and excellent repeatability to HCHO gas. The response value (Ra/Rg) is 24.5 towards 70 ppm HCHO gas at 350 °C. Besides, the gas sensing mechanism was described.

Fabrication and Material Analysis of Zinc Oxide Nanorods Grown on Gallium Nitride Substrate

2016 ◽  
Vol 19 (4) ◽  
pp. 181-183 ◽  
Author(s):  
Tzu-Yi Yu ◽  
Yi Cian Chen ◽  
Wang Ting Chiu ◽  
Yang Luo ◽  
Sheng Shin Wang ◽  
...  
Keyword(s):  
Au Nanoparticles ◽  
Zno Nanorods ◽  
Nano Particles ◽  
Zinc Oxide Nanorods ◽  
X Ray Diffraction ◽  
Thermal Methods ◽  
X Ray ◽  
Oxide Nanorods ◽  
Different Temperatures ◽  
Multiple Material

In this study, we address process how the ZnO nanorods were deposited on GaN substrates with spin-coating by using the hydro-thermal methods. After ZnO was spin coated, the samples were annealed with different temperatures to incorporate with Au nano particles. Multiple material analyses, such as the field emission scanning electron microscopy (FESEM), the energy dispersive X-ray spectroscopy (EDX) and the X-ray diffraction (XRD) analyses were carried out to characterize the Au nanoparticles/ZnO nanorods/GaN nanocomposites.

scholarly journals Effect of Growth Temperature and Time on Morphology and Gas Sensitivity of Cu2O/Cu Microstructures

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Ling Wu ◽  
Lun Zhang ◽  
Zhipeng Xun ◽  
Guili Yu ◽  
Liwei Shi
Keyword(s):  
Electron Microscopy ◽  
Gas Sensors ◽  
Gas Sensing ◽  
Spherical Particles ◽  
X Ray Diffraction ◽  
Gas Sensitivity ◽  
X Ray ◽  
Transmission Electron ◽  
Wide Range ◽  
Gas Response

A facile hydrothermal synthesis with CuSO4as the copper source was used to prepare micro/nano-Cu2O. The obtained samples have been characterized by X-ray diffraction, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). With increasing the reaction temperature and time, the final products were successively Cu2O octahedron microcrystals, Cu2O/Cu composite particles, and a wide range of Cu spherical particles. The gas sensitivity of products towards ethanol and acetone gases was studied. The results showed that sensors prepared with Cu2O/Cu composites synthesized at 65°C for 15 min exhibited optimal gas sensitivity. The gas sensing mechanism and the effect of Cu in the enhanced gas response were also elaborated. The excellent gas sensitivity indicates that Cu2O/Cu composites have potential application as gas sensors.

Ethanol Gas Sensor Fabrication Based on ZnO Flower Like Nanorods

2020 ◽  
Vol 38 (3B) ◽  
pp. 85-97
Author(s):  
Abdulqader D. Faisal ◽  
Mofeed A. Jaleel ◽  
Fahad Z. Kamal
Keyword(s):  
Gas Sensor ◽  
Seed Layer ◽  
Room Temperature ◽  
Gas Sensing ◽  
Average Crystallite Size ◽  
X Ray Diffraction ◽  
X Ray ◽  
Atomic Force ◽  
Sensor Fabrication ◽  
Synthesized Materials

Zinc oxide flower-like nanorods (ZnO NRs) was successfully synthesized via the hydrothermal method. The growth process was conducted with seed layer concentrations of 20mM. The as-synthesized nanostructures were characterized by x-ray diffraction (XRD), scanning electron microscope (SEM), atomic force microscope (AFM), and ultraviolet-visible (UV-VIS) spectrophotometer. The analysis results revealed a pure Wurtzite ZnO hexagonal nanostructures with preferred orientation (002) along the c-direction. The calculated band gap of average crystallite size is 3.2eV and 25 nm respectively. New designed, constructed and successfully calibrated for ethanol gas sensing was found. The ethanol gas sensor was fabricated at room temperature based on the ZnO NRs film. The synthesized materials proved to be a good candidate for the ethanol gas sensor. The optimum results of the gas sensor measurements of the synthesized gas sensor are as follows, the sensitivity, response time, and recovery time at 25 °C are 60%, 80 Seconds and 80 seconds respectively, and at 200 °C are 70%, 60 seconds and 50 seconds respectively.

Solid-State Reaction and Gas Sensor Properties of Porous SnO2-In2O3 Composites

2012 ◽  
Vol 512-515 ◽  
pp. 1268-1272
Author(s):  
Yu Cao ◽  
Xiao Long Zhou ◽  
Jian Chun Cao ◽  
Yuan Yuan Peng ◽  
Jing Chao Chen ◽  
...  
Keyword(s):  
Composite Materials ◽  
Solid State ◽  
Solid State Reaction ◽  
Gas Sensing ◽  
Solid State Reaction Method ◽  
Testing System ◽  
X Ray Diffraction ◽  
X Ray ◽  
Gas Sensing Properties ◽  
Sensor Properties

Mixtures of ITO and SnO2 powders were prepared by a solid-state reaction method in order to produce porous composite materials. X-ray diffraction, scanning electron microscope and gas sensing testing system have been used to analyze the microstructure and properties of it .It has been concluded that when the sintering temperature is 1573K,it has better gas-sensing properties. The pore structure and CO gas sensing property of porous SnO2-In2O3 composite materials can be improved with the increase of SnO2 contents.

scholarly journals Synthesis and Characterization of a Nano (CdO)0.94:(In2O3) 0.06 / Si gas Sensor

2021 ◽  
pp. 3858-3870
Author(s):  
M. F. A. Alias ◽  
H. A. Abdulrahman
Keyword(s):  
Thin Film ◽  
Gas Sensor ◽  
Morphological Properties ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Atomic Force ◽  
Q Switching ◽  
Sensor Properties

In this work, a (CdO)0.94:(In2O3)0.06 film was developed on a glass substrate using Q- switching pulse laser beam (Nd:YAG; wavelength 1064 nm). The quantitative elemental analysis of the (CdO)0.94:(In2O3)0.06 thin film was achieved using energy dispersive X- ray diffraction (EDX). The topological and morphological properties of the deposited thin film were investigated using atomic force microscope (AFM) and field emission scan electron microscopy (FESEM). The I-V characteristic and Hall effect of (CdO)0.94 :(In2O3)0.06 thin films were used  to  study the electrical properties. The gas sensor properties of the film prepared on n-Si were investigated for oxidization and reduction gases.

Functionalization of Au Nanoparticles on ZnO Nanorods through Low-Temperature Synthesis

2016 ◽  
Vol 675-676 ◽  
pp. 45-48 ◽  
Author(s):  
Sukon Kalasung ◽  
A. Kopwitthaya ◽  
M. Horprathum ◽  
J. Kaewkhao ◽  
S. Tuscharoen ◽  
...  
Keyword(s):  
Silicon Wafer ◽  
Au Nanoparticles ◽  
Hydrothermal Reaction ◽  
Zno Nanorods ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Au Nps ◽  
X Ray ◽  
Wafer Substrate ◽  
The Difference

Hybrid nanomaterials exhibit multi-functionalities, which is synergy or enhanced physical and optical properties over their single components with promising potentials for various applications in dye-sensitized solar cell and photocatalytic materials. In this present research, the Au nanoparticles were prepared at HAuCl4 concentration of 0.5 mM on ZnO nanorod templates and silicon wafer substrate by hydrothermal reaction process. The prepared samples were investigated the crystal structure, chemical composition and morphologies by X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS) and field-emission scanning electron microscopy (FESEM), respectively. The XRD results shown that ZnO was preferred orientation along the c-axis (002). The FE-SEM images indicated to the difference of size-Au NPs decorated on ZnO nanorods and silicon wafer. The relationship between the surface area and the size of Au NPs of the prepared samples was investigated and possible growing mechanism of Au NPs on ZnO nanorods templates will be discussed.

scholarly journals Synthesis and acetone sensing properties of ZnFe2O4/rGO gas sensors

2019 ◽  
Vol 10 ◽  
pp. 2516-2526 ◽  
Author(s):  
Kaidi Wu ◽  
Yifan Luo ◽  
Ying Li ◽  
Chao Zhang
Keyword(s):  
Electron Microscopy ◽  
Gas Sensors ◽  
Gas Sensing ◽  
Hollow Spheres ◽  
High Sensitivity ◽  
Inert Atmosphere ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Reduced Graphene

Hollow spheres of pure ZnFe2O4 and of composites of ZnFe2O4 and reduced graphene oxide (rGO) with different rGO content were prepared via a simple solvothermal method followed by a high-temperature annealing process in an inert atmosphere. The X-ray diffraction analysis confirmed that the introduction of rGO had no effect on the spinel structure of ZnFe2O4. In addition, the results of field-emission scanning electron microscopy and (high-resolution) transmission electron microscopy indicated that the synthesized samples had the structure of hollow spheres distributed uniformly onto rGO nanosheets. The diameters of the spheres were determined as about 600–1000 nm. The gas sensing test revealed that the introduction of rGO improved the performance of the sensing of acetone to low concentration, and the ZnFe2O4/rGO composite gas sensor containing 0.5 wt % of rGO exhibited a high sensitivity in sensing test using 0.8–100 ppm acetone at 200 °C. The response of the 0.5 wt % ZnFe2O4/rGO sensor to 0.8 ppm acetone was 1.50, and its response to 10 ppm acetone was 8.18, which is around 2.6 times more pronounced than the response of pure ZnFe2O4 (10 ppm, 3.20). Moreover, the sensor showed a wide linear range and good selectivity.

Tungsten Sulfide Nanoflakes: Synthesis by Electrospinning and Their Gas Sensing Properties

2017 ◽  
Vol 72 (4) ◽  
pp. 375-381 ◽  
Author(s):  
Ke Wang ◽  
Wen-Lin Feng ◽  
Xiang Qin ◽  
Da-Shen Deng ◽  
Xu Feng ◽  
...  
Keyword(s):  
Gas Sensors ◽  
Gas Sensing ◽  
Threshold Value ◽  
Group Symmetry ◽  
X Ray Diffraction ◽  
Tungsten Sulfide ◽  
X Ray ◽  
Surface Control ◽  
Gas Sensing Properties ◽  
Calcination Method

AbstractTungsten sulfide (WS2) nanoflakes were successfully prepared via electrospinning with polyvinylpyrrolidone (PVP) as organic solvent. In addition, Ag-deposited WS2 (Ag-WS2) was obtained by chemical blending/calcination method. The structure and morphology of as-prepared materials were characterised by powder X-ray diffraction (XRD) and scanning electron microscope (SEM), respectively. The XRD result shows that the prepared WS2 has a graphene-like structure with P63/mmc space group symmetry. The SEM illuminates that the sensing samples have nanoflake appearance. Furthermore, heater-type gas sensors were fabricated based on WS2 and Ag-WS2 nanomaterials. The sensing responses of WS2 and Ag-WS2 on the ammonia (NH3), ethanol (C2H5OH), and acetone (C3H6O) were investigated at about 220°C. The results indicate that gas sensor based on WS2 and Ag-WS2 nanoflakes has 60 ppm sensing threshold value for ammonia. One possible gas sensing mechanism of WS2 and Ag-WS2 gas sensors is surface control via charge transfer.

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