Gas sensing properties of ZnO nanostructures (flowers/rods) synthesized by hydrothermal method

Agarwal, Sunita; Rai, Prabhakar; Gatell, Eric Navarrete; Llobet, Eduard; Güell, Frank; Kumar, Manoj; Awasthi, Kamlendra

doi:10.1016/j.snb.2019.04.083

Cited by 249 publications

(90 citation statements)

References 49 publications

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“…The listing of all of them lies beyond the scope and ability of this paper, however one of the most commercially successful are the low-voltage phosphors [179] and some of the most currently researched ones include gas sensors, photocatalytic degradation and biological-oriented applications. Gas sensors that use ZnO nanostructures make use of the above described mechanism and try to find the optimal morphologies or crystallite shapes for specific and fast responses [180][181][182] (see Figure 11). Likewise, in photocatalytic applications, ZnO nanostructures are researched for breakdown of waterborne pollutants, in particular persistent organic pollutants, that are not removable by traditional treatment processes [183].…”

Section: Nanostructuresmentioning

confidence: 99%

ZnO as a Functional Material, a Review

2019

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Zinc oxide (ZnO) is a fascinating wide band gap semiconductor material with many properties that make it widely studied in the material science, physics, chemistry, biochemistry, and solid-state electronics communities. Its transparency, possibility of bandgap engineering, the possibility to dope it into high electron concentrations, or with many transition or rare earth metals, as well as the many structures it can form, all explain the intensive interest and broad applications. This review aims to showcase ZnO as a very versatile material lending itself both to bottom-up and top-down fabrication, with a focus on the many devices it enables, based on epitaxial structures, thin films, thick films, and nanostructures, but also with a significant number of unresolved issues, such as the challenge of efficient p-type doping. The aim of this article is to provide a wide-ranging cross-section of the current state of ZnO structures and technologies, with the main development directions underlined, serving as an introduction, a reference, and an inspiration for future research.

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Section: Nanostructuresmentioning

confidence: 99%

ZnO as a Functional Material, a Review

2019

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“…An important category of materials for the field of sensors is metal oxide semiconductors. These are versatile materials, used in many fields: domestic electronics, medicine, construction materials, sensors for detection of toxic, flammable and explosive gases [ 14 , 24 , 84 , 85 ], etc.…”

Section: Sensitive Materials Used In Gas Detectionmentioning

confidence: 99%

“…ZnO is an n-type II-IV, wide and direct band gap semiconductor of about 3.37 eV with a large excitation binding energy (60 meV) and with high electron mobility; it is one of the most promising materials in the field of sensors and optoelectronics [ 1 , 6 , 73 , 76 , 77 , 78 , 79 , 84 ]. In addition to the advantages listed above, ZnO is also characterized by a relatively simple synthesis process that allows the control of morphology and leads to oxygen vacancies, which are advantages in the field of sensors for gas molecule adsorption [ 126 ].…”

Section: Zno In Saw Sensorsmentioning

confidence: 99%

“…ZnO has also attracted attention for its low cost, ease of preparation, very good chemical stability, suitability to doping, non-toxicity, and ease of processing, for example in the form of thin films [ 84 , 128 ]. This is a material that can be easily synthesized in various types of nanostructures, such as nanorods ( Figure 2 a) [ 122 ], nanosheets ( Figure 2 b) [ 132 ], nanotubes ( Figure 2 c) [ 133 ], nanoflowers ( Figure 2 d) [ 1 ], microspheres ( Figure 2 e) [ 134 ], nanoplates ( Figure 2 f) [ 113 ], nanoflakes ( Figure 2 g) [ 135 ], nanowires ( Figure 2 h) [ 136 ], and nanofibers ( Figure 2 i) [ 137 ].…”

Section: Zno In Saw Sensorsmentioning

confidence: 99%

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ZnO Metal Oxide Semiconductor in Surface Acoustic Wave Sensors: A Review

Constantinoiu

Viespe

2020

Sensors

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Surface acoustic wave (SAW) gas sensors are of continuous development interest to researchers due to their sensitivity, short detection time, and reliability. Among the most used materials to achieve the sensitive film of SAW sensors are metal oxide semiconductors, which are highlighted by thermal and chemical stability, by the presence on their surface of free electrons and also by the possibility of being used in different morphologies. For different types of gases, certain metal oxide semiconductors are used, and ZnO is an important representative for this category of materials in the field of sensors. Having a great potential for the development of SAW sensors, the discussion related to the development of the sensitivity of metal oxide semiconductors, especially ZnO, by the synthesis method or by obtaining new materials, is suitable and necessary to have an overview of the latest results in this domain.

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“…Despite the potential doping of these elements, Cu is selected as dopant for the present investigations as it shows many interesting applications as uorescent sensor, acetone and ethanol gas sensor, H 2 S gas sensing, CO gas sensor, resistive random access memory, and diluted magnetic semiconductors [5]. Different synthesis methods like auto-combustion [6], ball milling [7], co precipitation [8], sol gel [9], hydrothermal [10] etc. are used for the preparation of transition metal doped ZnO nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Effect of Milling Time, Doping Concentration and Temperature on the Structural, Microstructural and Optical Properties of Cu Doped ZnO Nanoceramics

Das

Parashar

et al. 2020

Preprint

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In this work, high energy ball milling (HEBM) technique has been employed to successfully synthesize a series of Cu-doped ZnO nanoceramics (Zn 1-x Cu x O) with Cu concentration x = 0, 0.01, 0.02, 0.03 and 0.04. The synthesized nanoceramic was analysed by XRD, FESEM, TEM, Uv-Vis-DRS. The structural, microstructural and optical properties of the synthesized sample with different duration of milling, doping concentration and temperature has been investigated. X-ray diffraction result indicates that the samples are wurtzite structure with single phase. A decrease in peak intensity was observed with increase in milling time. 10h milled Cu doped ZnO sample shows single phase. After calcination at 900 ºC in x = 0.04 few peaks related to CuO was observed indicating the solubility limit of Cu in ZnO is 3 atomic%. With increase in milling time crystallite decreases where as strain increases however after calcination crystallite increases where as strain decreases. After calcination peak intensity increases. The specific surface area of ZnO increases after Cu doping but decreases after calcination. Bond length decreases after calcination but lattice distortion increases. FESEM micrograph shows particle growth after calcination. The average particle size decreases with increase in Cu concentration(30 nm to 20 nm) whereas increases after calcination and sintering (488 nm-2706 nm).The band gap decreases with increasing in milling time also with increase in Cu concentration and after calcination. Cu doping in ZnO shows red shift indicating Cu doped ZnO samples are suitable for optoelectronic device applications.

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Gas sensing properties of ZnO nanostructures (flowers/rods) synthesized by hydrothermal method

Cited by 249 publications

References 49 publications

ZnO as a Functional Material, a Review

ZnO as a Functional Material, a Review

ZnO Metal Oxide Semiconductor in Surface Acoustic Wave Sensors: A Review

Effect of Milling Time, Doping Concentration and Temperature on the Structural, Microstructural and Optical Properties of Cu Doped ZnO Nanoceramics

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