CQDs@NiO: An Efficient Tool for CH4 Sensing

Carbone, Marilena

doi:10.3390/app10186251

Cited by 21 publications

(17 citation statements)

References 60 publications

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“…Metal and mixed metal and semiconductor oxides are widely applied in several fields, as supercapacitors [1][2][3], gas sensors based on chemoresistivity [4][5][6][7][8] or dielectric excitation [9,10], heterojunctions [11,12], energy storage in batteries [13][14][15], and electrochemistry [16][17][18]. Their properties can be varied in different ways, by doping [19,20], capping, and controlling the structure, shape, and size with bottom-up and top-down approaches [21][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Room Temperature Syntheses of ZnO and Their Structures

et al. 2021

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ZnO has many technological applications which largely depend on its properties, which can be tuned by controlled synthesis. Ideally, the most convenient ZnO synthesis is carried out at room temperature in an aqueous solvent. However, the correct temperature values are often loosely defined. In the current paper, we performed the synthesis of ZnO in an aqueous solvent by varying the reaction and drying temperatures by 10 °C steps, and we monitored the synthesis products primarily by XRD). We found out that a simple direct synthesis of ZnO, without additional surfactant, pumping, or freezing, required both a reaction (TP) and a drying (TD) temperature of 40 °C. Higher temperatures also afforded ZnO, but lowering any of the TP or TD below the threshold value resulted either in the achievement of Zn(OH)2 or a mixture of Zn(OH)2/ZnO. A more detailed Rietveld analysis of the ZnO samples revealed a density variation of about 4% (5.44 to 5.68 gcm−3) with the synthesis temperature, and an increase of the nanoparticles’ average size, which was also verified by SEM images. The average size of the ZnO synthesized at TP = TD = 40 °C was 42 nm, as estimated by XRD, and 53 ± 10 nm, as estimated by SEM. For higher synthesis temperatures, they vary between 76 nm and 71 nm (XRD estimate) or 65 ± 12 nm and 69 ± 11 nm (SEM estimate) for TP =50 °C, TD = 40 °C, or TP = TD = 60 °C, respectively. At TP = TD = 30 °C, micrometric structures aggregated in foils are obtained, which segregate nanoparticles of ZnO if TD is raised to 40 °C. The optical properties of ZnO obtained by UV-Vis reflectance spectroscopy indicate a red shift of the band gap by ~0.1 eV.

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Section: Introductionmentioning

confidence: 99%

Room Temperature Syntheses of ZnO and Their Structures

et al. 2021

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“…Recently, several gas sensors involving the use of CDs were reported. For instance, El-Shamy designed a CDs-functionalized magnesium oxide (MgO) nano-particle (CDs@MgO) sensor for sensing hydrogen sulfide (H 2 S) gas [282], Ramos-Ramón et al developed a N-CDs based sensor for CO 2 [283], Wang et al fabricated silica aerosol-modified CDs-based gas sensor for NO 2 monitoring [284], and Carbone prepared a CDs-assembled nickel oxide (NiO)-based sensor for methane gas detection [285]. However, most of the CDs-based gas sensors reported to date were developed for environmental monitoring and safety, it is speculated that CDs-based gas sensors will be a promising research area in the near future for serving biomedical applications as well.…”

Section: Cdsmentioning

confidence: 99%

Carbon Dots: Classification, Properties, Synthesis, Characterization, and Applications in Health Care—An Updated Review (2018–2021)

2021

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Carbon dots (CDs) are usually smaller than 10 nm in size, and are meticulously formulated and recently introduced nanomaterials, among the other types of carbon-based nanomaterials. They have gained significant attention and an incredible interest in the field of nanotechnology and biomedical science, which is merely due to their considerable and exclusive attributes; including their enhanced electron transferability, photobleaching and photo-blinking effects, high photoluminescent quantum yield, fluorescence property, resistance to photo-decomposition, increased electrocatalytic activity, good aqueous solubility, excellent biocompatibility, long-term chemical stability, cost-effectiveness, negligible toxicity, and acquaintance of large effective surface area-to-volume ratio. CDs can be readily functionalized owing to the abundant functional groups on their surfaces, and they also exhibit remarkable sensing features such as specific, selective, and multiplex detectability. In addition, the physico-chemical characteristics of CDs can be easily tunable based on their intended usage or application. In this comprehensive review article, we mainly discuss the classification of CDs, their ideal properties, their general synthesis approaches, and primary characterization techniques. More importantly, we update the readers about the recent trends of CDs in health care applications (viz., their substantial and prominent role in the area of electrochemical and optical biosensing, bioimaging, drug/gene delivery, as well as in photodynamic/photothermal therapy).

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“…Their nanoparticles synthesis may be achieved in several, environmentally friendly ways [56][57][58][59][60][61][62][63], with several shapes, arrangements, and super-structures [64]. Depending on the specific size and morphological characteristics, they can be employed in the construction of several types of devices for different purposes, which include chemosensing [65][66][67][68], supercapacitive devices [69][70][71], solar cells [72,73], and resistive memories [74][75][76].…”

Section: Introductionmentioning

confidence: 99%

NiO-Based Electronic Flexible Devices

Carbone

2022

Applied Sciences

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Personal, portable, and wearable electronics have become items of extensive use in daily life. Their fabrication requires flexible electronic components with high storage capability or with continuous power supplies (such as solar cells). In addition, formerly rigid tools such as electrochromic windows find new utilizations if they are fabricated with flexible characteristics. Flexibility and performances are determined by the material composition and fabrication procedures. In this regard, low-cost, easy-to-handle materials and processes are an asset in the overall production processes and items fruition. In the present mini-review, the most recent approaches are described in the production of flexible electronic devices based on NiO as low-cost material enhancing the overall performances. In particular, flexible NiO-based all-solid-state supercapacitors, electrodes electrochromic devices, temperature devices, and ReRAM are discussed, thus showing the potential of NiO as material for future developments in opto-electronic devices.

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CQDs@NiO: An Efficient Tool for CH4 Sensing

Cited by 21 publications

References 60 publications

Room Temperature Syntheses of ZnO and Their Structures

Room Temperature Syntheses of ZnO and Their Structures

Carbon Dots: Classification, Properties, Synthesis, Characterization, and Applications in Health Care—An Updated Review (2018–2021)

NiO-Based Electronic Flexible Devices

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