ZnO sol–gel derived porous film for CO gas sensing

Hasunuma, Ryu; Park, Bo-Seok; Akbar, Sheikh A.; Lee, Woo-Sun; Hong, Kim Jae; Seo, Youn-Jin; Shin, Dongwoo; Park, Jin‐Seong; Choi, Gwang-Pyo

doi:10.1016/j.snb.2003.07.010

Cited by 129 publications

(41 citation statements)

References 10 publications

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“…The sensing properties of ZnO nanostructures are usually based on the highly active surface properties and the selective response to certain gases. Several studies have been carried out so far to monitor gas sensing properties of ZnO nanostructures with different morphologies showing that the ZnO nanostructures are very reactive for the gases such as CO [4], H 2 [5], CH 4 [6] , benzene [7] and volatiles like ethanol and acetone [8]. Apart from gas and vapor sensing, humidity monitoring is also very important for human life, industries, and scientific applications.…”

Section: Introductionmentioning

confidence: 99%

Humidity sensing properties of ZnO nanoparticles synthesized by sol–gel process

Erol

Okur

Comba

et al. 2010

Sensors and Actuators B: Chemical

142

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a b s t r a c tZnO nanoparticles have been synthesized by the sol-gel method with approximately 10 nm diameter and the humidity adsorption and desorption kinetics of ZnO nanoparticles were investigated by quartz crystal microbalance (QCM) technique. The morphology and crystal structure of the ZnO nanoparticles have been characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD), respectively. The roughness of the surface has been investigated using atomic force microscope (AFM). The dynamic Langmuir adsorption model was used to determine the kinetic parameters such as adsorption and desorption rates and Gibbs free energy under relative humidity between 45% and 88%. The relative sensitivity of the ZnO nanoparticles-based humidity sensor was determined by electrical resistance measurements. Our reproducible experimental results show that ZnO nanoparticles have a great potential for humidity sensing applications at room temperature operations.

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Section: Introductionmentioning

confidence: 99%

Humidity sensing properties of ZnO nanoparticles synthesized by sol–gel process

Erol

Okur

Comba

et al. 2010

Sensors and Actuators B: Chemical

142

View full text Add to dashboard Cite

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“…In both cases the detection scheme for CO involves the reaction with pre-adsorbed oxygen, and normal CO sensors based on metal oxides work only at high temperature (> 300°C) using its reducing effect [7,13]. However, to the best of our knowledge, oxidizing behavior of CO has not been reported.…”

Section: Introductionmentioning

confidence: 99%

Oxidation behaviour of carbon monoxide at the photostimulated surface of ZnO nanowires

Wang

Kinzer

Youn

et al. 2011

J. Phys. D: Appl. Phys.

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Dear Editor of the Journal of Physics D: Applied Physics:We are very thankful for the advises from the reviewers and the editor. The manuscript (Article ID: D/393066/PAP) has already been revised according to the comments (resubmitted online).Following are the comments and the answers, corresponding the second referee's report: "I find the paper to be well written,…, I recommend this paper for publication." We appreciate your taking time to review the manuscript and your commendation.corresponding the third referee's report: Comment #1: "In the Introduction, the authors should include some references dealing with room temperature sensors based on UV-activation of metal oxide nanowires…" Answer #1: Some references about the UV-activation of nanostructured materials have now been given in the introduction: "Thus, the photostimulated sensor, in particular based on nanostructured materials [15], enables gas detection at room temperature, resulting in a reduced power consumption [16]." Comment #2: "… why is there no particle seed formation on the bare Si in between the Au lines" Answer #2: The growth mechanism has been shortly explained in the text and a literature has been given: "The self-assembled monolayers (SAMs) of MPA, possessing two functional groups, namely, thiol and carboxylic acid, were selectively formed on the gold lines and used to discriminate between Au and Si surface as well as to interact with cationic Zn species in the solution phase. The growth mechanism has been explained in our previous work [14]." Comment #3: "Why is there no Au-supported growth on the metal lines without the particle layer at the high temperatures used. Can it be ruled out" Answer #3: The ZnO nanowires have been grown based not on the vapour-liquid-solid (VLS) but on the vapour-solid (VS) principle. Furthermore, we have not found any Au particles on the top of the ZnO nanowires.Comment #4: "Authors should provide information how the electrical responses are extracted…" Answer #4: The reviewer is right. The information of the electrical measurements is missing. Two sentences have been added in the experimental section: "Two electrical contacts were brought onto the two outer Au-lines. The electrical resistance of the ZnO nanowires between the Au-lines were determined during the sensing experiment, while the UV LED was regularly switched on and off for photostimulation and CO oxidation, respectively." Comment #5: "page 8 line 4 absorbed should read as adsorbed" Answer #5: The word in the text has been changed to be "adsorbed".Comment #6: "The non-equilibrium conditions with desorption of gaseous species at low pressure and inert gases are not close to realistic conditions in the environment. The authors should comment how this technique can lead to an operating room temperature sensor as stated in the manuscript" Answer #6: That's totally right. The measuring conditions described in this work are not close to normal realistic conditions in the environment which contains high concentration oxygen/water vapor as main interfering ...

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“…The sol-gel method was also successfully applied to the preparation of highly porous ZnO films for CO gas sensing applications. By changing the calcination temperature, different morphologies and gas sensing responses were possible, with the best sensing response achieved for a calcination temperature of 500 • C [110]. Hierarchically, 3D porous ZnO structures were obtained by hydrothermal method as well [103].…”

Section: Sol-gel Assisted Methodsmentioning

confidence: 99%

Porous Zinc Oxide Thin Films: Synthesis Approaches and Applications

Laurenti

Cauda

2018

Coatings

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Zinc oxide (ZnO) thin films have been widely investigated due to their multifunctional properties, i.e., catalytic, semiconducting and optical. They have found practical use in a wide number of application fields. However, the presence of a compact micro/nanostructure has often limited the resulting material properties. Moreover, with the advent of low-dimensional ZnO nanostructures featuring unique physical and chemical properties, the interest in studying ZnO thin films diminished more and more. Therefore, the possibility to combine at the same time the advantages of thin-film based synthesis technologies together with a high surface area and a porous structure might represent a powerful solution to prepare ZnO thin films with unprecedented physical and chemical characteristics that may find use in novel application fields. Within this scope, this review offers an overview on the most successful synthesis methods that are able to produce ZnO thin films with both framework and textural porosities. Moreover, we discuss the related applications, mainly focused on photocatalytic degradation of dyes, gas sensor fabrication and photoanodes for dye-sensitized solar cells.

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ZnO sol–gel derived porous film for CO gas sensing

Cited by 129 publications

References 10 publications

Humidity sensing properties of ZnO nanoparticles synthesized by sol–gel process

Humidity sensing properties of ZnO nanoparticles synthesized by sol–gel process

Oxidation behaviour of carbon monoxide at the photostimulated surface of ZnO nanowires

Porous Zinc Oxide Thin Films: Synthesis Approaches and Applications

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