Effect of reaction time on the particle size of ZnO and ZnO:Ce obtained by a sol–gel method

Flor, Juliana; Lima, Sergio A. M.; Davolos, Marian Rosaly

doi:10.1007/b97093

Cited by 10 publications

(7 citation statements)

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“…For the synthesis of CuS nanocrystals, different synthetic techniques have also been used [ 39 , 40 , 41 , 42 ] to produce nanoparticles with varying morphologies such as nanotubes [ 43 ], nanowires [ 44 ], and nanoplatelets [ 45 ], among others [ 46 , 47 ]. Among nanocrystal synthetic methods, the single-source precursor technique produces nanocrystals with reasonable monodispersity [ 48 ], and studies have indicated that the sizes and shapes of the resulting nanocrystals are influenced by the precursor concentration [ 49 ], reaction time [ 50 ], and temperature [ 51 ]. As a result of nanocrystals’ unique size-dependent physical and chemical properties [ 52 , 53 ], the synthesis of monodisperse nanocrystals continue to attract much research attention [ 54 ].…”

Section: Introductionmentioning

confidence: 99%

RETRACTED: Synthesis, Optical and Structural Properties of Copper Sulfide Nanocrystals from Single Molecule Precursors

Ajibade

Botha

2017

Nanomaterials

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We report the synthesis and structural studies of copper sulfide nanocrystals from copper (II) dithiocarbamate single molecule precursors. The precursors were thermolysed in hexadecylamine (HDA) to prepare HDA-capped CuS nanocrystals. The optical properties of the nanocrystals studied using UV–visible and photoluminescence spectroscopy showed absorption band edges at 287 nm that are blue shifted, and the photoluminescence spectra show emission curves that are red-shifted with respect to the absorption band edges. These shifts are as a result of the small crystallite sizes of the nanoparticles leading to quantum size effects. The structural studies were carried out using powder X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and atomic force microscopy. The XRD patterns indicates that the CuS nanocrystals are in hexagonal covellite crystalline phases with estimated particles sizes of 17.3–18.6 nm. The TEM images showed particles with almost spherical or rod shapes, with average crystallite sizes of 3–9.8 nm. SEM images showed morphology with ball-like microspheres on the surfaces, and EDS spectra confirmed the presence of CuS nanoparticles.

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Section: Introductionmentioning

confidence: 99%

RETRACTED: Synthesis, Optical and Structural Properties of Copper Sulfide Nanocrystals from Single Molecule Precursors

Ajibade

Botha

2017

Nanomaterials

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“…3. The optical band gap for the two films was calculated by the Tauc method [16,17], and the values found were 3.27 eV and 3.26 eV for the ZnO film obtained via Pechini method and solgel method respectively. Absorption spectra and calculated optical gap of the two films do not show considerable difference indicating that they are optically similar.…”

Section: Resultsmentioning

confidence: 99%

Electroluminescence of zinc oxide thin-films prepared via polymeric precursor and via sol–gel methods

et al. 2007

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“…It was reported that the unusual size increase at 16 h resul accumulation. Furthermore, Flor et al (2004) studied the impact of resp particle sizes of ZnO and Cerium doped ZnO [447]. The study indicated th in particle size with reaction time rise.…”

Section: Factors Influencing the Activity Of Nanoparticlesmentioning

confidence: 99%

Nanotechnology as a Novel Approach in Combating Microbes Providing an Alternative to Antibiotics

et al. 2021

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The emergence of infectious diseases promises to be one of the leading mortality factors in the healthcare sector. Although several drugs are available on the market, newly found microorganisms carrying multidrug resistance (MDR) against which existing drugs cannot function effectively, giving rise to escalated antibiotic dosage therapies and the need to develop novel drugs, which require time, money, and manpower. Thus, the exploitation of antimicrobials has led to the production of MDR bacteria, and their prevalence and growth are a major concern. Novel approaches to prevent antimicrobial drug resistance are in practice. Nanotechnology-based innovation provides physicians and patients the opportunity to overcome the crisis of drug resistance. Nanoparticles have promising potential in the healthcare sector. Recently, nanoparticles have been designed to address pathogenic microorganisms. A multitude of processes that can vary with various traits, including size, morphology, electrical charge, and surface coatings, allow researchers to develop novel composite antimicrobial substances for use in different applications performing antimicrobial activities. The antimicrobial activity of inorganic and carbon-based nanoparticles can be applied to various research, medical, and industrial uses in the future and offer a solution to the crisis of antimicrobial resistance to traditional approaches. Metal-based nanoparticles have also been extensively studied for many biomedical applications. In addition to reduced size and selectivity for bacteria, metal-based nanoparticles have proven effective against pathogens listed as a priority, according to the World Health Organization (WHO). Moreover, antimicrobial studies of nanoparticles were carried out not only in vitro but in vivo as well in order to investigate their efficacy. In addition, nanomaterials provide numerous opportunities for infection prevention, diagnosis, treatment, and biofilm control. This study emphasizes the antimicrobial effects of nanoparticles and contrasts nanoparticles’ with antibiotics’ role in the fight against pathogenic microorganisms. Future prospects revolve around developing new strategies and products to prevent, control, and treat microbial infections in humans and other animals, including viral infections seen in the current pandemic scenarios.

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Effect of reaction time on the particle size of ZnO and ZnO:Ce obtained by a sol–gel method

Cited by 10 publications

References 0 publications

RETRACTED: Synthesis, Optical and Structural Properties of Copper Sulfide Nanocrystals from Single Molecule Precursors

RETRACTED: Synthesis, Optical and Structural Properties of Copper Sulfide Nanocrystals from Single Molecule Precursors

Electroluminescence of zinc oxide thin-films prepared via polymeric precursor and via sol–gel methods

Nanotechnology as a Novel Approach in Combating Microbes Providing an Alternative to Antibiotics

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