Aspect ratio-controlled ZnO nanorods for highly sensitive wireless ultraviolet sensor applications

2017 ◽  
Vol 5 (46) ◽  
pp. 12256-12263 ◽  
Author(s):  
Teahoon Park ◽  
Kang Eun Lee ◽  
Nari Kim ◽  
Youngseok Oh ◽  
Jung-Keun Yoo ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Aspect Ratio ◽  
Zno Nanorods ◽  
Sensor Applications ◽  
Highly Sensitive ◽  
Ultraviolet Sensor

Structurally controlled zinc oxide (ZnO) nanorods (NRs) were synthesized for ultraviolet (UV) sensing.

Hydrothermal Growth of Zinc Oxide (ZnO) Nanorods (NRs), Structural, and Chemical Composition Studies for pH Measurement Sensor Applications

2018 ◽  
Vol 88 (1) ◽  
pp. 437-447 ◽  
Author(s):  
S K Naveen Kumar ◽  
A Akshaya Kumar ◽  
Almaw Ayele Aniley ◽  
Shekhar Bhansali ◽  
Renny E Fernandez
Keyword(s):  
Zinc Oxide ◽  
Chemical Composition ◽  
Composition Studies ◽  
Zno Nanorods ◽  
Hydrothermal Growth ◽  
Ph Measurement ◽  
Measurement Sensor ◽  
Sensor Applications

scholarly journals The Role of ALD-ZnO Seed Layers in the Growth of ZnO Nanorods for Hydrogen Sensing

Micromachines ◽  
2019 ◽  
Vol 10 (7) ◽  
pp. 491 ◽  
Author(s):  
Yangming Lu ◽  
Chiafen Hsieh ◽  
Guanci Su
Keyword(s):  
Zinc Oxide ◽  
Surface Area ◽  
Gas Sensing ◽  
Zno Nanorods ◽  
Clean Energy ◽  
Hydrogen Sensor ◽  
Zno Films ◽  
Hydrogen Sensing ◽  
Highly Sensitive ◽  
Seed Layers

Hydrogen is one of the most important clean energy sources of the future. Because of its flammability, explosiveness, and flammability, it is important to develop a highly sensitive hydrogen sensor. Among many gas sensing materials, zinc oxide has excellent sensing properties and is therefore attracting attention. Effectively reducing the resistance of sensing materials and increasing the surface area of materials is an important issue to increase the sensitivity of gas sensing. Zinc oxide seed layers were prepared by atomic layer deposition (ALD) to facilitate the subsequent hydrothermal growth of ZnO nanorods. The nanorods are used as highly sensitive materials for sensing hydrogen due to their inherent properties as oxide semiconductors and their very high surface areas. The low resistance value of ALD-ZnO helps to transport electrons when sensing hydrogen gas and improves the sensitivity of hydrogen sensors. The large surface area of ZnO nanorods also provides lots of sites of gas adsorption which also increases the sensitivity of the hydrogen sensor. Our experimental results show that perfect crystallinity helped to reduce the electrical resistance of ALD-ZnO films. High areal nucleation density and sufficient inter-rod space were determining factors for efficient hydrogen sensing. The sensitivity increased with increasing hydrogen temperature, from 1.03 at 225 °C, to 1.32 at 380 °C after sensing 100 s in 10,000 ppm of hydrogen. We discuss in detail the properties of electrical conductivity, point defects, and crystal quality of ALD-ZnO films and their probable effects on the sensitivity of hydrogen sensing.

scholarly journals Single-mode Fiber Coated with Zinc Oxide (ZnO) Nanorods for H2 Gas Sensor Applications

2019 ◽  
Author(s):  
Norazlina Saidin ◽  
Nur Farahi Idris ◽  
Mohd Hanif Yaacob ◽  
Sulaiman Wadi Harun ◽  
Aliza Aini Md Ralib ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Gas Sensor ◽  
Zno Nanorods ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Sensor Applications

scholarly journals Factorial Design of Experiments for Optimization of Photocatalytic Degradation of Tartrazine by Zinc Oxide (ZnO) Nanorods with Different Aspect Ratios

2020 ◽  
Author(s):  
Andrew Skinner ◽  
Anthony DiBernardo ◽  
Arvid Masud ◽  
Nirupam Aich ◽  
Alexandre Pinto
Keyword(s):  
Zinc Oxide ◽  
Aspect Ratio ◽  
Photocatalytic Degradation ◽  
Factorial Design ◽  
Removal Efficiency ◽  
Rate Constant ◽  
Zno Nanorods ◽  
Order Rate Constant ◽  
Order Rate ◽  
Initial Ph

The photocatalytic degradation of the azo dye tartrazine using zinc oxide (ZnO) as photocatalyst under ultraviolet light was investigated using a 2<sup>4</sup> factorial design. The variables studied were the aspect ratio of ZnO nanorods, the ZnO load, the initial pH of tartrazine solution, and the H<sub>2</sub>O<sub>2</sub> volume. These variables were studied aiming to maximize the tartrazine removal efficiency and the pseudo-1<sup>st</sup>-order rate constant of the removal process. The ZnO aspect ratio was tuned by varying the Lewis base during the synthesis, hexamethylenetetramine (HMTA) was used to prepare ZnO with low aspect ratio (ZnO_LowAR), and NaOH was used to prepare ZnO with high aspect ratio (ZnO_HighAR). The microstructural characterizations indicated that ZnO_LowAR and ZnO_HighAR nanorods have similar structural, textural and optical properties. The only exception was the dimensions of the nanorods obtained, which could result in differences in the facets exposed on each type of nanorod surface. The factorial design revealed that ZnO aspect ratio, the initial pH of tartrazine solution, and the H<sub>2</sub>O<sub>2</sub> volume all have primary significant effects, whereas the ZnO load is not significant neither in the tartrazine removal efficiency nor in the pseudo-1<sup>st</sup>-order rate constant. Statistical models considering the coefficients of the significant interactions were obtained, leading to reasonable predicted results in comparison to the results experimentally obtained. The conditions leading to highest removal efficiency (~92%) and pseudo-1<sup>st</sup>-order rate constant (3.81 x 10<sup>-2</sup> min<sup>-1</sup>) were carried out with ZnO_HighAR, initial pH 7, and without H<sub>2</sub>O<sub>2</sub>, which outperformed the TiO<sub>2</sub> P-25 under the same conditions.

Growth of Zinc Oxide Nanorods in Alocohol Solution

2003 ◽  
Vol 775 ◽  
Author(s):  
Richard D. Yang ◽  
Yuntao Li ◽  
Hung-Jue Sue
Keyword(s):  
Zinc Oxide ◽  
Aspect Ratio ◽  
Absorption Spectroscopy ◽  
Growth Kinetics ◽  
Zno Nanorods ◽  
Methanol Solution ◽  
Zinc Oxide Nanorods ◽  
Anisotropic Growth ◽  
Oxide Nanorods ◽  
Ligand Adsorption

AbstractZinc oxide (ZnO) nanorods have been grown by hydrolyzing Zn(OAc)2•2H2O in methanol solution. Nanoparticles in sizes ranging from 2 to 4 nm were first obtained at low concentration. The growth kinetics was monitored by UV-vis absorption spectroscopy. The precursor was then concentrated by 10 folds and refluxed at 60°C for 24 hours to form ZnO nanorods with an aspect ratio of 12. Ligand adsorption growth model was proposed to explain the anisotropic growth.

scholarly journals Factorial Design of Experiments for Optimization of Photocatalytic Degradation of Tartrazine by Zinc Oxide (ZnO) Nanorods with Different Aspect Ratios

2020 ◽  
Author(s):  
Andrew Skinner ◽  
Anthony DiBernardo ◽  
Arvid Masud ◽  
Nirupam Aich ◽  
Alexandre Pinto
Keyword(s):  
Zinc Oxide ◽  
Aspect Ratio ◽  
Photocatalytic Degradation ◽  
Factorial Design ◽  
Removal Efficiency ◽  
Rate Constant ◽  
Zno Nanorods ◽  
Order Rate Constant ◽  
Order Rate ◽  
Initial Ph

The photocatalytic degradation of the azo dye tartrazine using zinc oxide (ZnO) as photocatalyst under ultraviolet light was investigated using a 2<sup>4</sup> factorial design. The variables studied were the aspect ratio of ZnO nanorods, the ZnO load, the initial pH of tartrazine solution, and the H<sub>2</sub>O<sub>2</sub> volume. These variables were studied aiming to maximize the tartrazine removal efficiency and the pseudo-1<sup>st</sup>-order rate constant of the removal process. The ZnO aspect ratio was tuned by varying the Lewis base during the synthesis, hexamethylenetetramine (HMTA) was used to prepare ZnO with low aspect ratio (ZnO_LowAR), and NaOH was used to prepare ZnO with high aspect ratio (ZnO_HighAR). The microstructural characterizations indicated that ZnO_LowAR and ZnO_HighAR nanorods have similar structural, textural and optical properties. The only exception was the dimensions of the nanorods obtained, which could result in differences in the facets exposed on each type of nanorod surface. The factorial design revealed that ZnO aspect ratio, the initial pH of tartrazine solution, and the H<sub>2</sub>O<sub>2</sub> volume all have primary significant effects, whereas the ZnO load is not significant neither in the tartrazine removal efficiency nor in the pseudo-1<sup>st</sup>-order rate constant. Statistical models considering the coefficients of the significant interactions were obtained, leading to reasonable predicted results in comparison to the results experimentally obtained. The conditions leading to highest removal efficiency (~92%) and pseudo-1<sup>st</sup>-order rate constant (3.81 x 10<sup>-2</sup> min<sup>-1</sup>) were carried out with ZnO_HighAR, initial pH 7, and without H<sub>2</sub>O<sub>2</sub>, which outperformed the TiO<sub>2</sub> P-25 under the same conditions.

Fabrication and characterization of a highly sensitive hydroquinone chemical sensor based on iron-doped ZnO nanorods

2015 ◽  
Vol 44 (48) ◽  
pp. 21081-21087 ◽  
Author(s):  
Ahmad Umar ◽  
Ali Al-Hajry ◽  
Rafiq Ahmad ◽  
S. G. Ansari ◽  
Mohammed Sultan Al-Assiri ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Chemical Sensor ◽  
Zno Nanorods ◽  
Screen Printed Electrode ◽  
Highly Sensitive ◽  
Iron Doped ◽  
Doped Zno ◽  
Fabrication And Characterization ◽  
Screen Printed

Herein, we report the development of a simple and highly sensitive hydroquinone (HQ) chemical sensor based on an electrochemically activated iron-doped zinc oxide nanorod modified screen-printed electrode.

Highly sensitive uric acid biosensor based on vertically arranged ZnO nanorods on ZnO nanoparticles seeded electrode

2021 ◽  
Author(s):  
Vandana Nagal ◽  
VIRENDRA KUMAR ◽  
Marya Khan ◽  
Suliman Alomar ◽  
Nirmalya Tripathy ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Uric Acid ◽  
Zno Nanoparticles ◽  
Zno Nanorods ◽  
Diagnosis And Treatment ◽  
Renal Disorder ◽  
Highly Sensitive ◽  
Uric Acid Biosensor

Uric acid (UA) level quantification is crucial for the diagnosis and treatment of cardiovascular, arthritis, renal disorder, and preeclampsia diseases. We report solvent-assisted synthesis of zinc oxide (ZnO) nanoparticles (NPs)...

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