scholarly journals Negative Effects of Annealed Seed Layer on the Performance of ZnO-Nanorods Based Nitric Oxide Gas Sensor

Sensors ◽  
2022 ◽  
Vol 22 (1) ◽  
pp. 390
Author(s):  
Pragya Singh ◽  
Firman Mangasa Simanjuntak ◽  
Li-Lun Hu ◽  
Tseung-Yuen Tseng ◽  
Hsiao-Wen Zan ◽  
...  

Nitric oxide (NO) is a toxic gas, which is dangerous for human health and causes many respiratory infections, poisoning, and lung damage. In this work, we have successfully grown ZnO nanorod film on annealed ZnO seed layer in different ambient temperatures, and the morphology of the nanorods sensing layer that affects the gas sensing response to nitric oxide (NO) gas were investigated. To acknowledge the effect of annealing treatment, the devices were fabricated with annealed seed layers in air and argon ambient at 300 °C and 500 °C for 1 h. To simulate a vertical device structure, a silver nanowire electrode covered in ZnO nanorod film was placed onto the hydrothermal grown ZnO nanorod film. We found that annealing treatment changes the seed layer’s grain size and defect concentration and is responsible for this phenomenon. The I–V and gas sensing characteristics were dependent on the oxygen defects concentration and porosity of nanorods to react with the target gas. The resulting as-deposited ZnO seed layer shows better sensing response than that annealed in an air and argon environment due to the nanorod morphology and variation in oxygen defect concentration. At room temperature, the devices show good sensing response to NO concentration of 10 ppb and up to 100 ppb. Shortly, these results can be beneficial in the NO breath detection for patients with chronic inflammatory airway disease, such as asthma.

RSC Advances ◽  
2014 ◽  
Vol 4 (84) ◽  
pp. 44452-44456 ◽  
Author(s):  
Y. Yin ◽  
Y. Sun ◽  
M. Yu ◽  
X. Liu ◽  
B. Yang ◽  
...  

Annealing or plasma pre-treating the ZnO seed layer influences the nucleation and hydrothermal growth of ZnO nanorods and their photoluminescence.


2019 ◽  
Vol 2019 ◽  
pp. 1-7 ◽  
Author(s):  
Jian Shang ◽  
Ye Sun ◽  
Teng Zhang ◽  
Zhen Liu ◽  
Hong Zhang

Silver (Ag) has broad-spectrum antibacterial properties and is widely used in various fields, including in antibacterial coatings for orthopedic implants. For reasons of cost and cytotoxicity, improvement of the antibacterial efficiency of Ag is necessary. The scientific community has also shown a strong enthusiasm in this research area. In this paper, ZnO nanorod arrays were prepared on a titanium (Ti) substrate by seed-assisted hydrothermal method and Ag nanoparticles were deposited by magnetron sputtering to obtain Ag nanoparticle-decorated ZnO nanorod arrays (ZnO nanorods/Ag nanoparticles). The antibacterial properties of ZnO nanorods/Ag nanoparticles against Pseudomonas aeruginosa were systematically studied by agar diffusion method and were compared with other samples such as ZnO nanorod arrays and ZnO seed layer/Ag nanoparticles. The experimental results showed that ZnO nanorods/Ag nanoparticles displayed significantly higher antibacterial properties against Pseudomonas aeruginosa than other samples, including ZnO nanorod arrays and ZnO seed layer/Ag nanoparticles. These superior antibacterial properties originated predominantly from the morphological structure of ZnO nanorods, which optimized the particle size and distribution of Ag nanoparticles, greatly improving their antimicrobial efficiency. The synergistic antibacterial properties of Ag nanoparticles and ZnO nanorods make Ag nanoparticle-decorated ZnO nanorod arrays a promising candidate for antibacterial coating of orthopedic implants.


2014 ◽  
Vol 24 (3) ◽  
pp. 736-742 ◽  
Author(s):  
Jian-jiao ZHANG ◽  
Er-jun GUO ◽  
Li-ping WANG ◽  
Hong-yan YUE ◽  
Guo-jian CAO ◽  
...  

2016 ◽  
Vol 675-676 ◽  
pp. 130-133
Author(s):  
Wissawat Sakulsaknimitr ◽  
Kanyakorn Teanchai ◽  
Mati Horprathum ◽  
Chanunthorn Chananonnawathorn ◽  
Saksorn Limwichean ◽  
...  

ZnO nanorods were grown on magnetron sputtered ultra-thin ZnO seed layers through a hydrothermal method. Before ZnO nanorods growth, the ultra-thin ZnO seed layer has been annealed at temperatures ranging from 100 to 400°C in air. The influence of annealing treatment on the crystalline structure of the ultra-thin ZnO seed layers has been investigated by X-ray diffraction (XRD). The size and density of final prepared ZnO nanorods were investigated by field-emission scanning electron microscopy (FE-SEM). It was found that the length and the aspect ratio of the ZnOnanorods can be readily tuned by control of the ZnO ultra-thin seeds layer which results from the annealing treatment process.


RSC Advances ◽  
2015 ◽  
Vol 5 (114) ◽  
pp. 94222-94226 ◽  
Author(s):  
Giwoong Nam ◽  
Jae-Young Leem

We used a hydrothermal method combined with a graphene oxide (GO)/ZnO seed layer to fabricate a ZnO nanorod based fast-response UV detector.


2012 ◽  
Vol 501 ◽  
pp. 199-203
Author(s):  
Riski Titian Ginting ◽  
Chi Chin Yap ◽  
Muhammad Yahaya ◽  
Muhamad Mat Salleh

Inverted type bulk heterojunction organic solar cell based on ZnO nanorod arrays have been used to overcome the degradation problem of conjugated polymer and low work function electrode. ZnO nanorods and Eosin-Y are widely used to increase the charge mobility and light absorbance, respectively. The effects of Eosin-Y coating temperature (30 – 50 oC) on the performance of organic solar cells based on a blend of poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEHPPV) as donor and (6,6)-phenyl-C61 butyric acid methyl ester (PC61BM) as acceptor with a structure of fluorine-doped tin oxide (FTO)/Eosin-Y coated ZnO nanorod arrays/MEHPPV:PCBM/Ag were investigated. By using FTO as a substrate, sol-gel and spin coating method was used to deposit ZnO seed layer on FTO surface. The ZnO nanorods were then grown on the ZnO seed layer by chemical bath deposition method and coated with dye by immersing the substrates into Eosin-Y solution at different temperatures. The result shows that absorption of Eosin-Y coated ZnO nanorods increased with dye coating temperature. The optimum power conversion efficiency of η = 1.24 × 10-2 % was achieved at dye coating temperature 50 oC under 100 mW/cm2 simulated AM 1.5 G sunlight.


RSC Advances ◽  
2015 ◽  
Vol 5 (74) ◽  
pp. 59823-59829 ◽  
Author(s):  
Seong-Ho Baek ◽  
Gwang-Hee Nam ◽  
Il-Kyu Park

Morphological evolution of ZnAl-based hybrid nanostructures from ZnAl layered double hydroxide to ZnO nanorods grown by a hydrothermal method depending on the thickness of the Al2O3/ZnO double seed layer.


2019 ◽  
Vol 18 (03n04) ◽  
pp. 1940056
Author(s):  
V. Srivastava ◽  
S. B. Eadi ◽  
S.-K. Hong

The effect of Al doping on the morphology and sensing properties of ZnO nanorods have been shown. Undoped and Al-doped well-aligned ZnO nanorods have been grown on sputtered ZnO/SiO2/Si (100) pre-grown seed layer substrate by the hydrothermal method. The molar ratio of dopant (aluminum nitrate) in the solution, [Al/Zn], was varied from 0.1% to 3%. The prepared ZnO nanorods showed preferred orientation [Formula: see text]0001[Formula: see text] and were well aligned vertically. We observed that for 0.5% Al doping the diameter and resistivity of the nanorods became the least, carrier concentration became large. Sensing behavior of the doped samples tested for H2 gas shows the sensitivity of [Formula: see text] at [Formula: see text]C and [Formula: see text] at [Formula: see text]C, respectively.


RSC Advances ◽  
2016 ◽  
Vol 6 (51) ◽  
pp. 45660-45663 ◽  
Author(s):  
Gaocan Qi ◽  
Xiaodan Lu ◽  
Zhihao Yuan

The decoration of nano-porous SiO2 thin film prevents the poisoning phenomenon of ZnO nanorod in H2S detection.


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