ZnO Nanostructures for Gas Sensing Applications: From Tetrapods-Based Chemoresistive Devices to Carbon Fiber Integration

AbstractRecent results in the use of Zinc Oxide (ZnO) nano/submicron crystals in fields as diverse as sensors, UV lasers, solar cells, piezoelectric nanogenerators and light emitting devices have reinvigorated the interest of the scientific community in this material. To fully exploit the wide range of properties offered by ZnO, a good understanding of the crystal growth mechanism and related defects chemistry is necessary. However, a full picture of the interrelation between defects, processing and properties has not yet been completed, especially for the ZnO nanostructures that are now being synthesized. Furthermore, achieving good control in the shape of the crystal is also a very desirable feature based on the strong correlation there is between shape and properties in nanoscale materials. In this paper, the synthesis of ZnO nanostructures via two alternative aqueous solution methods - sonochemical and hydrothermal - will be presented, together with the influence that the addition of citric anions or variations in the concentration of the initial reactants have on the ZnO crystals shape. Foreseen applications might be in the field of sensors, transparent conductors and large area electronics possibly via ink-jet printing techniques or self-assembly methods.

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Gas sensing applications of 1D-nanostructured zinc oxide: Insights from density functional theory calculations

Progress in Materials Science ◽

10.1016/j.pmatsci.2011.06.001 ◽

2012 ◽

Vol 57 (3) ◽

pp. 437-486 ◽

Cited By ~ 155

Author(s):

Michelle J.S. Spencer

Keyword(s):

Density Functional Theory ◽

Zinc Oxide ◽

Density Functional ◽

Gas Sensing ◽

Density Functional Theory Calculations ◽

Functional Theory ◽

Sensing Applications ◽

Nanostructured Zinc Oxide

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Zinc Oxide and Copper Oxide Nanostructures: Fundamentals and Applications

MRS Proceedings ◽

10.1557/opl.2012.65 ◽

2012 ◽

Vol 1406 ◽

Cited By ~ 1

Author(s):

Magnus Willander ◽

Omer Nur ◽

Gul Amin ◽

A. Zainelabdin ◽

S. Zaman

Keyword(s):

Zinc Oxide ◽

Copper Oxide ◽

Light Emitting Diodes ◽

Zno Nanorods ◽

Superior Performance ◽

Zno Nanostructures ◽

Large Area ◽

Light Emitting ◽

Sensing Applications ◽

Quality Material

ABSTRACTCopper oxide (CuO) and zinc oxide (ZnO) nanostructures complement each other since CuO is unintentional p-type and ZnO unintentional n-type. Using the low temperature chemical growth approach, the effect on morphology of varying the pH of the grown ZnO nanostructures and CuO micro structures is monitored. For both materials the variation of the pH was found to lead to a large variation on the morphology achieved. The grown ZnO NRs and CuO micro flowers material were used to fabricate devices. We demonstrate results from ZnO nanorods (NRs)/polymer p-n hybrid heterojunctions chemically grown on paper and using a process on paper for light emitting diodes (LEDs) applications as well as some large area light emitting diodes LEDs. The growth of CuO micro flowers indicated good quality material for sensing applications. The grown CuO micro flowers were employed as pH sensors. The results indicated a superior performance as expect due to the catalytic properties of this material.

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Mg-doped and chemo-thermally treated ZnO nanoflowers for ethanol sensing

10.21203/rs.3.rs-164155/v1 ◽

2021 ◽

Author(s):

Santanu Maity ◽

P.P Sahu ◽

Tiju Thomas

Keyword(s):

Gas Sensing ◽

Morphological Properties ◽

X Ray Diffraction ◽

X Ray ◽

Sensing Applications ◽

Wide Range ◽

Doped Zno ◽

Ethanol Sensing ◽

Better Than ◽

Mg Doped

Abstract ZnO nanostructures are promising for a wide range of applications, including gas sensors. Ethanol sensing using ZnO remains unexplored though. In this paper, we report ethanol-sensing using un-doped ZnO nano flowers and Mg doped ZnO nano flowers. These are grown using a rather simple chemo-thermal process, making this a plausibly scalable technology. To study the structural and morphological properties of undoped ZnO and Mg doped ZnO nanoflowers, Raman spectroscopy, Fourier Transform Infrared Spectroscopy (FTIR), x-ray diffraction and Field Emission Scanning Electron Microscopy (FESEM) are carried out. Ethanol sensing properties of undoped ZnO and Mg doped ZnO nanoflower devices are investigated toward different ethanol concentration (concentration range of 1–600 ppm at 100°C–200°C). Our findings show that 15% Mg doped ZnO nano flower is better than ZnO nano flower for ethanol gas-sensing applications.

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MODELLING THE GROWTH OF ZINC OXIDE NANOSTRUCTURES

The ANZIAM Journal ◽

10.1017/s1446181109000157 ◽

2009 ◽

Vol 50 (3) ◽

pp. 395-406

Author(s):

JADE R. MACKAY ◽

STEPHEN P. WHITE ◽

SHAUN C. HENDY

Keyword(s):

Zinc Oxide ◽

Two Dimensions ◽

Zno Nanostructures ◽

Zinc Oxide Nanostructures ◽

Tight Control ◽

Oxide Nanostructures ◽

Deposition Parameters ◽

Wide Range ◽

Model Predictions ◽

Deposition Techniques

AbstractZinc oxide is known to produce a wide variety of nanostructures that show promise for a number of applications. The use of electrochemical deposition techniques for growing ZnO nanostructures can allow tight control of the morphology of ZnO through the wide range of deposition parameters available. Here we model the growth of the rods under typical electrochemical conditions, using the Nernst–Planck equations in two dimensions to predict the growth rate and morphology of the nanostructures as a function of time. Generally good quantitative and qualitative agreement is found between the model predictions and recent experimental results.

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Flame-Spray-Made Undoped Zinc Oxide Films for Gas Sensing Applications

Sensors ◽

10.3390/s100807863 ◽

2010 ◽

Vol 10 (8) ◽

pp. 7863-7873 ◽

Cited By ~ 33

Author(s):

Nittaya Tamaekong ◽

Chaikarn Liewhiran ◽

Anurat Wisitsoraat ◽

Sukon Phanichphant

Keyword(s):

Zinc Oxide ◽

Gas Sensing ◽

Oxide Films ◽

Flame Spray ◽

Zinc Oxide Films ◽

Sensing Applications

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Growth of Zinc Oxide Nanowires and Nanobelts for Gas Sensing Applications

Journal of Metastable and Nanocrystalline Materials ◽

10.4028/www.scientific.net/jmnm.23.27 ◽

2005 ◽

Vol 23 ◽

pp. 27-30 ◽

Cited By ~ 54

Author(s):

M.K. Hossain ◽

S.C. Ghosh ◽

Y. Boontongkong ◽

Chanchana Thanachayanont ◽

Joydeep Dutta

Keyword(s):

Zinc Oxide ◽

Electrical Resistance ◽

Gas Sensing ◽

Electrical Conductance ◽

Analyte Molecule ◽

Sensor Material ◽

Surface And Interface ◽

Sensing Applications ◽

Sensing Material ◽

Specific Material

Zinc Oxide (ZnO) is a very useful as a solid state gas sensor material. In chemical sensing the surface and interface interactions between the analyte molecules and the sensing material is all but important that is read through the changes in electrical conductance. In that sense, nano-objects with a large surface atom/bulk atom ratio, like nanoparticles and nanowires, are potentially the best chemical sensors. The mechanism envisioned involves the adsorption (and eventually diffusion) of the analyte molecule at the surface that induces a change in the electrical resistance of the nano-object. The most convenient way to measure changes in electrical resistance in such devices is to obtain the specific material as nanowires or as connected nanoparticles. Here, we will discuss about a low-temperature wet-chemical process of synthesizing ZnO nanoparticles, nanowires and nanobelts for application as gas sensors.

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Fiber Optic Gas Sensors Based on Lossy Mode Resonances and Sensing Materials Used Therefor: A Comprehensive Review

Sensors ◽

10.3390/s21030731 ◽

2021 ◽

Vol 21 (3) ◽

pp. 731

Author(s):

Ignacio Vitoria ◽

Carlos Ruiz Zamarreño ◽

Aritz Ozcariz ◽

Ignacio R. Matias

Keyword(s):

Optical Fiber ◽

Gas Sensors ◽

Gas Sensing ◽

Optical Fiber Sensors ◽

Industrial Sector ◽

Fiber Sensors ◽

Sensing Applications ◽

Wide Range ◽

Materials Used ◽

Diagnostic Applications

Pollution in cities induces harmful effects on human health, which continuously increases the global demand of gas sensors for air quality control and monitoring. In the same manner, the industrial sector requests new gas sensors for their productive processes. Moreover, the association between exhaled gases and a wide range of diseases or health conditions opens the door for new diagnostic applications. The large number of applications for gas sensors has permitted the development of multiple sensing technologies. Among them, optical fiber gas sensors enable their utilization in remote locations, confined spaces or hostile environments as well as corrosive or explosive atmospheres. Particularly, Lossy Mode Resonance (LMR)-based optical fiber sensors employ the traditional metal oxides used for gas sensing purposes for the generation of the resonances. Some research has been conducted on the development of LMR-based optical fiber gas sensors; however, they have not been fully exploited yet and offer optimal possibilities for improvement. This review gives the reader a complete overview of the works focused on the utilization of LMR-based optical fiber sensors for gas sensing applications, summarizing the materials used for the development of these sensors as well as the fabrication procedures and the performance of these devices.

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