Chemical Sensing Applications of ZnO Nanomaterials

Chaudhary, Savita; Umar, Ahmad; Bhasin, K. K.; Baskoutas, Sotirios

doi:10.3390/ma11020287

Cited by 200 publications

(72 citation statements)

References 107 publications

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“…In this regard, thin films of TiO 2 and ZnO build-up with the sputtering technique can also be considered as sensorial layers. These films proved to be efficient for the detection of molecules with phenolic rings and they presented high mechanical stability under pH fluctuations [36][37][38]. This study aimed to achieve a customized e-tongue device to follow real-time degradation and quantification of TCS and its derivative by-products in an electrochemical flow reactor (EFR) treatment.…”

Section: Introductionmentioning

confidence: 99%

Electronic Tongue Coupled to an Electrochemical Flow Reactor for Emerging Organic Contaminants Real Time Monitoring

Magro

Mateus

Paz‐Garcia

et al. 2019

Sensors

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Triclosan, which is a bacteriostatic used in household items, has raised health concerns, because it might lead to antimicrobial resistance and endocrine disorders in organisms. The detection, identification, and monitoring of triclosan and its by-products (methyl triclosan, 2,4-Dichlorophenol and 2,4,6-Trichlorophenol) are a growing need in order to update current water treatments and enable the continuous supervision of the contamination plume. This work presents a customized electronic tongue prototype coupled to an electrochemical flow reactor, which aims to access the monitoring of triclosan and its derivative by-products in a real secondary effluent. An electronic tongue device, based on impedance measurements and polyethylenimine/poly(sodium 4-styrenesulfonate) layer-by-layer and TiO2, ZnO and TiO2/ZnO sputtering thin films, was developed and tested to track analyte degradation and allow for analyte detection and semi-quantification. A degradation pathway trend was observable by means of principal component analysis, being the sample separation, according to sampling time, explained by 77% the total variance in the first two components. A semi-quantitative electronic tongue was attained for triclosan and methyl-triclosan. For 2,4-Dichlorophenol and 2,4,6-Trichlorophenol, the best results were achieved with only a single sensor. Finally, working as multi-analyte quantification devices, the electronic tongues could provide information regarding the degradation kinetic and concentrations ranges in a dynamic removal treatment.

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Section: Introductionmentioning

confidence: 99%

Electronic Tongue Coupled to an Electrochemical Flow Reactor for Emerging Organic Contaminants Real Time Monitoring

Magro

Mateus

Paz‐Garcia

et al. 2019

Sensors

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“…[7][8][9]. Article a II-VI semiconductor, are among the most important semiconductor nanomaterials as they possess wide-band gap (3.37 eV at room temperature), high-exciton binding energy (60 meV) and visible optical transmittance (above 80%), thermal and chemical stability, non-toxicity, and so on [10][11][12][13]. Because of their significant use in electronics, sensors (gas, chemical and bio), optical devices, photocatalysis, energy devices (solar cells, supercapacitors, batteries, hydrogen energy, etc.…”

Section: Introductionmentioning

confidence: 99%

Growth of n-Ga doped ZnO nanowires interconnected with disks over p-Si substrate and their heterojunction diode application

Al‒Hadeethi¹,

Badran²,

Umar³

et al. 2020

mat express

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In this paper, the heterojunction diode based on n-Ga doped ZnO nanowires interconnected with disks/p-Si assembly was fabricated and their low-temperature electrical properties were examined. The Ga-doped ZnO nanowires interconnected with disks were grown over p-Si substrate and studied by numerous techniques to understand the structural, compositional and morphological characteristics. Electrical properties, at lowtemperatures ranging from 77 K-295 K, were examined for the fabricated heterojunction diode assembly both in reverse and forward biased conditions which exhibited an excellent stability over all the temperature range. The detailed electrical characterizations revealed that the current decreases gradually from 1.9 A, to 0.87 A to 0.84 A when temperature increases from 77 K, 100 K to 150 K and then increases gradually from 1.86 A-3.36 A and to 9.95 A when temperature increases from 200 K-250 K and to 295 K, respectively. Both the highest rectifying ratio at 100 K and the lowest one at 295 K occur in the voltage range of 2-5 V.

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“…It has been also reported that the co-presence of hierarchical ZnO nanostructures and noble metal nanoparticles can be advantageous for many applications (i.e., catalytic/photocatalytic, electric charge capacity, and sensing property) [22,23], due to the strong surface plasmon resonance and to the charge separation efficiency given by the noble metal nanoparticles. Further study is needed for the knowledge of the process that is occurring in the vapor-solid process and of the role of Au/Pt nanoparticles in affecting the shape and size of ZnO particles, as well as their effectiveness in increasing quantities and homogeneity of the samples.…”

Section: Morphology From Sem and Afm Imagesmentioning

confidence: 99%

Zinc Oxide Nanostructures: From Chestnut Husk-Like Structures to Hollow Nanocages, Synthesis and Structure

et al. 2018

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Tailor-made nanostructured ZnO cages have been catalytically grown on Au and Pt films covering silicon substrates, by a controlled evaporation process, which means an accurate choice of temperatures, times, gas flows (He in the heating, He/air during the synthesis), and Au/Pt film thickness. The effect of the process parameters affecting the morphology and the structure of the obtained materials has been investigated by XRD analysis, scanning electron microscopy (SEM) and atomic force microscopy (AFM) microscopies, and FTIR spectroscopies. In particular, the role of the synthesis temperature in affecting the size and shape of the obtained ZnO cages has been highlighted. It will be shown that by adopting higher temperatures, the protruding nanowhiskers several microns in length, covering the cages and exhibiting both basal and prismatic faces, change into very thin and narrow structures, with extended prismatic faces, prevailing with respect to the basal ones. At an even higher process temperature, the building up of Au particles aggregates inside and/or anchored to the walls of the hollow cages, without any evidence of elongated ZnO nanostructures will be highlighted. From FTIR spectra information on lattice modes of the investigated ZnO, materials have been obtained.

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Chemical Sensing Applications of ZnO Nanomaterials

Cited by 200 publications

References 107 publications

Electronic Tongue Coupled to an Electrochemical Flow Reactor for Emerging Organic Contaminants Real Time Monitoring

Electronic Tongue Coupled to an Electrochemical Flow Reactor for Emerging Organic Contaminants Real Time Monitoring

Growth of n-Ga doped ZnO nanowires interconnected with disks over p-Si substrate and their heterojunction diode application

Zinc Oxide Nanostructures: From Chestnut Husk-Like Structures to Hollow Nanocages, Synthesis and Structure

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