SYNTHESIS OF HIGHLY STABLE SILVER-LOADED VERTICAL ZnO NANOWIRES ARRAY AND ITS ACETYLENE SENSING PROPERTIES

A silver-loaded one-dimensional (1D) vertical ZnO nanowires (NWs) array synthesized by a facile seed mediated hydrothermal-RF magnetron sputtering method has been investigated for the fabrication of a highly stable and reproducible acetylene (C2H2) gas sensor. Successful immobilization of silver nanoparticles (NPs) as a sensitizer on the ZnO NWs array significantly enhanced the C2H2 sensing properties and showed a stable sensing performance. The grown structure exhibited high response magnitude (30.8 at 1000[Formula: see text]ppm), short response time (43[Formula: see text]s) and excellent selectivity at 220[Formula: see text]C. The enhanced performance can probably be accounted for the effect of combining the highly orientated ZnO NWs and catalytically active silver-based network. The superior sensing features toward C2H2 along with broad detection range (1–1000[Formula: see text]ppm), outstanding stability and excellent reproducibility indicate that the sensor is a promising candidate for practical applications.

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The 1,2-propanediol-sensing properties of one-dimension Tb2O3-modified ZnO nanowires synthesized by water-glycerol binary thermal route

Analytica Chimica Acta ◽

10.1016/j.aca.2021.338454 ◽

2021 ◽

Vol 1160 ◽

pp. 338454

Author(s):

Wanyi Ling ◽

Wang Jian ◽

Niu Gao ◽

Dachuan Zhu

Keyword(s):

Zno Nanowires ◽

One Dimension ◽

Sensing Properties ◽

Water Glycerol

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Effects of rare earth elements doping on gas sensing properties of ZnO nanowires

Ceramics International ◽

10.1016/j.ceramint.2021.05.133 ◽

2021 ◽

Author(s):

Sikai Zhao ◽

Yanbai Shen ◽

Ang Li ◽

Yunshuang Chen ◽

Shuling Gao ◽

...

Keyword(s):

Rare Earth ◽

Rare Earth Elements ◽

Gas Sensing ◽

Zno Nanowires ◽

Sensing Properties ◽

Gas Sensing Properties

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Process-Induced Nanostructures on Anatase Single Crystals via Pulsed-Pressure MOCVD

Materials ◽

10.3390/ma13071668 ◽

2020 ◽

Vol 13 (7) ◽

pp. 1668 ◽

Cited By ~ 1

Author(s):

Rukmini Gorthy ◽

Susan Krumdieck ◽

Catherine Bishop

Keyword(s):

Metalorganic Chemical Vapor Deposition ◽

Crystal Size ◽

Chemical Vapor ◽

Competitive Growth ◽

Promising Candidate ◽

Columnar Crystal ◽

Practical Applications ◽

Global Pandemic ◽

Crystal Diameter ◽

Plate Width

The recent global pandemic of COVID-19 highlights the urgent need for practical applications of anti-microbial coatings on touch-surfaces. Nanostructured TiO2 is a promising candidate for the passive reduction of transmission when applied to handles, push-plates and switches in hospitals. Here we report control of the nanostructure dimension of the mille-feuille crystal plates in anatase columnar crystals as a function of the coating thickness. This nanoplate thickness is key to achieving the large aspect ratio of surface area to migration path length. TiO2 solid coatings were prepared by pulsed-pressure metalorganic chemical vapor deposition (pp-MOCVD) under the same deposition temperature and mass flux, with thickness ranging from 1.3–16 μm, by varying the number of precursor pulses. SEM and STEM were used to measure the mille-feuille plate width which is believed to be a key functional nano-dimension for photocatalytic activity. Competitive growth produces a larger columnar crystal diameter with thickness. The question is if the nano-dimension also increases with columnar crystal size. We report that the nano-dimension increases with the film thickness, ranging from 17–42 nm. The results of this study can be used to design a coating which has co-optimized thickness for durability and nano-dimension for enhanced photocatalytic properties.

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Effect of Heterointerface on NO2 Sensing Properties of In-Situ Formed TiO2 QDs-Decorated NiO Nanosheets

Nanomaterials ◽

10.3390/nano9111628 ◽

2019 ◽

Vol 9 (11) ◽

pp. 1628 ◽

Cited By ~ 2

Author(s):

Congyi Wu ◽

Jian Zhang ◽

Xiaoxia Wang ◽

Changsheng Xie ◽

Songxin Shi ◽

...

Keyword(s):

Charge Transfer ◽

Gas Sensing ◽

Tio2 Particle ◽

Sensing Properties ◽

Practical Applications ◽

Enhanced Sensitivity ◽

Peak Fitting ◽

Two Phases ◽

Nio Nanosheets

In this work, TiO2 QDs-modified NiO nanosheets were employed to improve the room temperature NO2 sensing properties of NiO. The gas sensing studies showed that the response of nanocomposites with the optimal ratio to 60 ppm NO2 was nearly 10 times larger than that of bare NiO, exhibiting a potential application in gas sensing. Considering the commonly reported immature mechanism that the effective charge transfer between two phases contributes to an enhanced sensitivity, the QDs sensitization mechanism was further detailed by designing a series of contrast experiments. First, the important role of the QDs size effect was revealed by comparing the little enhanced sensitivity of TiO2 particle-modified NiO with the largely enhanced sensitivity of TiO2 QDs-NiO. Second, and more importantly, direct evidence of the heterointerface charge transfer efficiency was detailed by the extracted interface bond (Ti-O-Ni) using XPS peak fitting. This work can thus provide guidelines to design more QDs-modified nanocomposites with higher sensitivity for practical applications.

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The Preparation of the Highly Preferred Orientation of AlN Thin Films on ZnO Substrates

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.669.181 ◽

2013 ◽

Vol 669 ◽

pp. 181-184

Author(s):

Nan Ding ◽

Li Ming Xu ◽

Bao Jia Wu ◽

Guang Rui Gu

Keyword(s):

Thin Films ◽

Film Surface ◽

Rf Magnetron Sputtering ◽

Zno Films ◽

X Ray Diffraction ◽

Zno Film ◽

Promising Candidate ◽

Si Substrates ◽

Good Crystallinity ◽

Crystallite Structure

Zinc oxide (ZnO) films were prepared on Si substrates and then aluminum nitride (AlN) films were deposited on ZnO films by radio frequency (RF) magnetron sputtering. The crystal orientation, crystallite structure and surface morphology of AlN/ZnO films were characterized by X-ray diffraction (XRD), Raman spectrum and scanning electron microscopy (SEM). It was indicated that the AlN films were closely deposited on the ZnO film and had good crystallinity. Moreover, about 1μm-sized crystal particles with high c-axial orientation distributed uniformly on the AlN/ZnO film surface. It was indicated that ZnO could be a promising candidate as buffer layer for preparation of AlN thin films.

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