Highly Sensitive Ethanol Gas Sensor Using Pyramid-Shaped ZnO Particles with (0001) Basal Plane

Saito, Noriko; Watanabe, Ken; Haneda, Hajime; Sakaguchi, Isao; Shimanoe, Kengo

doi:10.1021/acs.jpcc.8b01936

Cited by 48 publications

(25 citation statements)

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“…ZnO generally crystallizes into three main structures, i.e., hexagonal wurtzite, cubic rocksalt, and cubic zinc blende structures, among which the wurtzite crystal structure is the most common since it is thermodynamically stable under ambient conditions [52]. ZnO can be present in a wide diversity of shapes, such as nanocombs, nanorings, nanohelixes/nanosprings, nanobelts, nanowires, and nanocages [53]; needle-like, flower-like, rod-like, flake-shaped, and spherical nanodiscs [28]; crushed stone-like, cylinder-shaped, and bullet-like structures; sheets, polyhedra, and ellipsoids [2]; hexagonal plate-like structures [54,55]; rod-shaped particles [54,56]; pyramid-shaped structures [57]; multispheres [58]; doughnut-shaped structures [59][60][61]; nanosheets [62]; dumbbell-shaped structures [34]; nanoleaves [63]; nanobows [64]; and star, multi-pod and spike-shaped structures [65].…”

Section: Characteristics Of Znomentioning

confidence: 99%

Zinc Oxide for Functional Textile Coatings: Recent Advances

2019

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The use of ZnO for the functionalization of textile substrates is growing rapidly, since it can provide unique multifunctional properties, such as photocatalytic self-cleaning, antimicrobial activity, UV protection, flame retardancy, thermal insulation and moisture management, hydrophobicity, and electrical conductivity. This paper aims to review the recent progress in the fabrication of ZnO-functionalized textiles, with an emphasis on understanding the specificity and mechanisms of ZnO action that impart individual properties to the textile fibers. The most common synthesis and application processes of ZnO to textile substrates are summarized. The influence of ZnO concentration, particle size and shape on ZnO functionality is presented. The importance of doping and coupling procedures to enhance ZnO performance is highlighted. The need to use binding and seeding agents to increase the durability of ZnO coatings is expressed. In addition to functional properties, the cytotoxicity of ZnO coatings is also discussed. Future directions in the use of ZnO for textile functionalization are identified as well.

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Section: Characteristics Of Znomentioning

confidence: 99%

Zinc Oxide for Functional Textile Coatings: Recent Advances

2019

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“…The random deposition of pyramid particles on the c (−)-surface would be the same as precipitation of pyramid particles under agitation, 29 as shown in Scheme 1 c. In both cases, there is no guide to the oriented attachments as with the c (+)-surface substrate and the spheres. Ostwald ripening occurs easily and results in a pyramidal shape as the particles are in contact with the solution.…”

Section: Resultsmentioning

confidence: 99%

Selective Homoepitaxial Growth of ZnO Layers on c(+)-Surface by Solvothermal Reaction in Water–Ethylene Glycol Solvent

2020

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Solvothermal deposition of ZnO layers on the c (±)-surfaces of ZnO single crystal substrates in a water–ethylene glycol solvent was investigated. Homoepitaxial growth of nanoparticulate layers was observed on the c (+)-surface. The manner of nanoparticle deposition on the c (+)-surface was similar to that of spherical particles precipitated in the solution, in that both grew through the oriented attachment of small particles during the early growth stage. The growth of the nanoparticulate film on the c (−)-surface was much slower than that on the c (+)-surface. After aging, the top surface of the film on the c (+)-surface transformed into a layer of pyramid-like particles so that the base of the pyramids was directed toward the surface. In contrast, randomly oriented pyramidal particles covered the c (−)-surface. Ostwald ripening through dissolution–recrystallization transformed the nanoparticles into pyramid-shaped particles in the latter stage when they were in contact with the solution. The faster growth on the c (+)-surface than on the c (−)-surface and the pyramidal shape of the particles with c (+)-basal plane deposited on the c (±)-surfaces after aging confirmed that the growth of the c (+)-plane was promoted, whereas the growth of {101̅0} and c (−)-planes was inhibited in this solution.

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“…The electrical resistance was measured under gas flow at 100 sccm of synthetic air and 1-50 ppm ethanol gas. The size of the chamber was about 500 cm 3 . The device was heated with an external furnace.…”

Section: Methodsmentioning

confidence: 99%

“…The pyramid particles showed an extremely high sensor response to ethanol gas [3]. Figure 3 shows the dynamic response to ethanol gas in air (1, 5, and 50 ppm) measured at 320ºC.…”

Section: Fig 3 Dynamic Response Of Pyramid Shaped Znomentioning

confidence: 99%