scholarly journals ZnO Nanorods for Gas Sensors

2020 ◽  
Author(s):  
Yanmin Wang
Keyword(s):  
Gas Sensors ◽  
Zno Nanorods

Characteristics of ZnO nanorods-based ammonia gas sensors with a cross-linked configuration

2015 ◽  
Vol 221 ◽  
pp. 491-498 ◽  
Author(s):  
Tai-You Chen ◽  
Huey-Ing Chen ◽  
Chi-Shiang Hsu ◽  
Chien-Chang Huang ◽  
Jian-Sheng Wu ◽  
...  
Keyword(s):  
Gas Sensors ◽  
Zno Nanorods ◽  
Ammonia Gas ◽  
Ammonia Gas Sensors

ZnO-Based Gas Sensors Prepared by EPD and Hydrothermal Growth

2015 ◽  
Vol 654 ◽  
pp. 94-98 ◽  
Author(s):  
Roman Yatskiv ◽  
María Verde ◽  
Jan Grym
Keyword(s):  
Gas Sensors ◽  
Room Temperature ◽  
Gas Sensing ◽  
Low Cost ◽  
Zno Nanorods ◽  
Zno Films ◽  
Nanorod Arrays ◽  
Zno Nanorod Arrays ◽  
Current Voltage ◽  
Gas Sensing Properties

Arrays of vertically well aligned ZnO nanorods (NRs) were prepared on nanostructured ZnO films using a low temperature hydrothermal method. We propose the use of the low cost, environmentally friendly electrophoretic deposition technique (EPD) as seeding procedure, which allows the obtaining of homogeneous, well oriented nanostructured ZnO thin films. ZnO nanorod arrays were covered with graphite in order to prepare graphite/ZnO NRs junctions. These nanostructured junctions showed promising current-voltage rectifying characteristics and gas sensing properties at room temperature.

Ce-doped ZnO nanorods based low operation temperature NO2 gas sensors

2014 ◽  
Vol 40 (7) ◽  
pp. 10867-10875 ◽  
Author(s):  
Chi-Jung Chang ◽  
Chang-Yi Lin ◽  
Jem-Kun Chen ◽  
Mu-Hsiang Hsu
Keyword(s):  
Gas Sensors ◽  
Zno Nanorods ◽  
Operation Temperature ◽  
Doped Zno ◽  
No2 Gas Sensors

Diffusion-Driven Al-Doping of ZnO Nanorods and Stretchable Gas Sensors Made of Doped ZnO Nanorods/Ag Nanowires Bilayers

2018 ◽  
Vol 11 (1) ◽  
pp. 1411-1419 ◽  
Author(s):  
Gitae Namgung ◽  
Qui Thanh Hoai Ta ◽  
Woochul Yang ◽  
Jin-Seo Noh
Keyword(s):  
Gas Sensors ◽  
Zno Nanorods ◽  
Al Doping ◽  
Ag Nanowires ◽  
Doped Zno

A MEMS-Based Ionization Gas Sensor with ZnO Nanorods Coated Distributed Micro-Discharge Structure

2014 ◽  
Vol 551 ◽  
pp. 460-465
Author(s):  
Mao Bo Fang ◽  
Xiao Lin Zhao ◽  
Jian Hua Li ◽  
Zi Wang ◽  
Yan Fang Wang ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Gas Sensors ◽  
Zno Nanorods ◽  
Polarization Structure ◽  
Sensor Device ◽  
Discharge Structure ◽  
Mems Technology ◽  
Anode Electrode ◽  
Good Repeatability ◽  
Structure Array

A kind of ionization gas sensor based on the polarization structure was designed and manufactured by MEMS technology. The gas sensor device consists of 3 main parts: the anode electrode, the cathode and the distributed polarization structure array which lie between the former two parts. All parts were coated with ZnO nanorods by a two-step hydrothermal method. Different concentration acetone gas was tested using the device. The results support that the ionization gas sensors exhibit reasonable sensitivity and good repeatability at the applied voltages lower than 4V.

Synthesis and properties of ZnO nanorods as ethanol gas sensors

2012 ◽  
Vol 85 (3) ◽  
pp. 035701 ◽  
Author(s):  
K Mirabbaszadeh ◽  
M Mehrabian
Keyword(s):  
Gas Sensors ◽  
Zno Nanorods

scholarly journals Synthesis of ZnO Hierarchical Structures and Their Gas Sensing Properties

Nanomaterials ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 1277 ◽  
Author(s):  
Chao Fan ◽  
Fazhe Sun ◽  
Xiaomei Wang ◽  
Zuzhen Huang ◽  
Mina Keshvardoostchokami ◽  
...  
Keyword(s):  
Gas Sensors ◽  
Gas Sensing ◽  
Zno Nanorods ◽  
Hierarchical Structures ◽  
Raw Material ◽  
Point Contacts ◽  
Sensing Properties ◽  
Transmission Electron ◽  
Zno Nanofibers ◽  
Hydrothermal Methods

Firecracker-like ZnO hierarchical structures (ZnO HS1) were synthesized by combining electrospinning with hydrothermal methods. Flower-like ZnO hierarchical structures (ZnO HS2) were prepared by a hydrothermal method using ultrasound-treated ZnO nanofibers (ZnO NFs) as raw material which has rarely been reported in previous papers. Scanning electron microscope (SEM) and transmission electron microscope’s (TEM) images clearly indicated the existence of nanoparticles on the ZnO HS2 material. Both gas sensors exhibited high selectivity toward H2S gas over various other gases at 180 °C. The ZnO HS2 gas sensor exhibited higher H2S sensitivity response (50 ppm H2S, 42.298) at 180 °C than ZnO NFs (50 ppm H2S, 9.223) and ZnO HS1 (50 ppm H2S, 17.506) gas sensors. Besides, the ZnO HS2 sensor showed a shorter response time (14 s) compared with the ZnO NFs (25 s) and ZnO HS1 (19 s) gas sensors. The formation diagram of ZnO hierarchical structures and the gas sensing mechanism were evaluated. Apart from the synergistic effect of nanoparticles and nanoflowers, more point–point contacts between flower-like ZnO nanorods were advantageous for the excellent H2S sensing properties of ZnO HS2 material.

scholarly journals Characterization of Al-doped ZnO nanorods grown by chemical bath deposition method

2018 ◽  
Vol 6 (1) ◽  
pp. 1-9
Author(s):  
Sabah M. Ahmed
Keyword(s):  
Metal Oxide ◽  
Gas Sensors ◽  
Zno Nanorods ◽  
Metal Oxide Semiconductors ◽  
Al Doping ◽  
Oxide Semiconductors ◽  
X Ray ◽  
Glass Substrates ◽  
Doped Zno ◽  
Doping Ratio

Introduction: In recent years a metal oxide semiconductors have been paid attention due to their excellent chemical and physical properties. ZnO (Zinc oxide) is considered as one of the most attractive semiconductor materials for implementation in photo-detectors, gas sensors, photonic crystals, light emitting diodes, photodiodes, and solar cells, due to its novel electrical and optoelectronic properties. There are different uses of metal oxide semiconductors such us, UV photodetectors which are useful in space research’s, missile warning systems, high flame detectors, air quality spotting, gas sensors, and precisely calculated radiation for the treatment of UV-irradiated skin. ZnO is a metal oxide semiconductors and it is used as a transparent conducting oxide thin film because it has the best higher thermal stability, best resistance against the damage of hydrogen plasma processing and relatively cheaper if one compares it with ITO. Materials and Methods: On glass substrates, Al-doped ZnO (AZO) nanorods have been grown by a low -cost chemical bath deposition (CBD) method at low temperature. The seed layer of ZnO was coated on glass substrates. The effect of the Al-doping on the aligned, surface morphology, density, distribution, orientation and structure of ZnO nanorods are investigated. The Al-doping ratios are 0%, 0.2%, 0.8% and 2%. The Aluminum Nitrate Nonahydrate (Al (NO3)3.9H2O) was added to the growth solution, which is used as a source of the aluminum dopant element. The morphology and structure of the Al-doped ZnO nanorods are characterized by field emission scanning electron microscopy (FESEM) and high-resolution X-ray diffractometer (XRD). using the radio RF (Radio frequency) magnetron technique. Results and Discussion: The results show that the Al-doping have remarkable effects on the topography parameters such as diameter, distribution, alignment, density and nanostructure shape of the ZnO nanorods. These topography parameters have proportionally effective with increases of the Al-doping ratio. Also, X-ray diffraction results show that the Al-doping ratio has a good playing role on the nanostructure orientation of the ZnO nanorods. Conclusions: The Aluminum Nitride Nanohydrate considered as a good Aluminum source for doping ZnONR.  It is clear from FESEM results that the Al-doping of ZnONR has a remarkable effect on the surface topography of nanorods for all aluminum doping ratios. From XRD patterns, it concludes that as the Al-doping ratio increases, the reorientation of the nanostructure of ZnO increases towards [100] direction. The results obtained also have shown that the average diameter of a nanorod is increased with increasing the ratio of Al-doping.

scholarly journals An easy method of preparing ozone gas sensors based on ZnO nanorods

RSC Advances ◽  
2015 ◽  
Vol 5 (25) ◽  
pp. 19528-19533 ◽  
Author(s):  
Ariadne C. Catto ◽  
Luís F. da Silva ◽  
Caue Ribeiro ◽  
Sandrine Bernardini ◽  
Khalifa Aguir ◽  
...  
Keyword(s):  
Hydrothermal Method ◽  
Gas Sensor ◽  
Gas Sensors ◽  
Zno Nanorods ◽  
Zno Nanorod ◽  
Easy Method ◽  
One Dimensional

One-dimensional (1D) ZnO nanorod-like structures were successfully grown via a hydrothermal method to be used as an ozone gas sensor.

Flat-Type Gas Sensors Based on ZnO Nanorod Arrays

2020 ◽  
Vol 20 (12) ◽  
pp. 7800-7807
Author(s):  
Yue-Wu Pan ◽  
Shuang-Jiao Peng ◽  
Ya-Lei Ma ◽  
Pei-Jiang CaO ◽  
Feng Hu
Keyword(s):  
Gas Sensors ◽  
Zno Nanorods ◽  
Areal Density ◽  
Zno Nanorod ◽  
Nanorod Arrays ◽  
Zno Nanorod Arrays ◽  
Gas Sensitivity ◽  
Axis Orientation ◽  
Vacancy Defects ◽  
Flat Type

ZnO seed layers were deposited on silicon and sapphire substrates by the pulsed laser deposition (PLD) method, and ZnO nanorod arrays with different orientation degrees were grown using the chemical vapor deposition (CVD) method. Flat-type gas sensors based on the ZnO nanorod arrays were fabricated, and their gas sensitivity properties were studied. The ZnO seed layer with a thickness of approximately 450 nm exhibits high c-axis orientation and possesses few defects. The ZnO nanorods fabricated on both of the substrates grow along the [0001] direction and contain a large number of oxygen vacancy defects. These nanorods have lengths of 8~10 μm and diameters of 200~500 nm. The ZnO nanorods grown on the silicon substrate are perpendicular to the surface of the substrate, and their areal density is approximately 3.0×108/cm2, while those grown on the sapphire substrate exhibit a lower orientation degree, and their areal density is approximately 0.9×108/cm2. The largest response of the gas sensor for gaseous alcohol reaches 48.2, and the optimal operating temperature for all of the sensors is approximately 280 °C. The gas sensitivity property of the silicon-based sensor is superior to that of the sapphire-based sensor, and the corresponding sensing mechanism is discussed.

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