Sonochemical synthesis and measurement of optical properties of zinc sulfide quantum dots

Goharshadi, Elaheh Kafshdare; Sajjadi, Sayyed Hashem; Mehrkhah, Roya; Nancarrow, Paul

doi:10.1016/j.cej.2012.07.131

Cited by 63 publications

(28 citation statements)

References 29 publications

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“…The second important influence of size is related to the electronic properties. With decreasing particle size, the energy of exciton levels of a semiconductor metal oxide shifts and hence the optical band gap changes [7,9]. Structural and electronic properties obviously change the physical and chemical properties of a solid which are the third group of properties influenced by size in a simple classification [6,10].…”

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confidence: 99%

Influence of preparation methods of microwave, sol–gel, and hydrothermal on structural and optical properties of lanthania nanoparticles

2015

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applications involve a metal oxide as active phase, promoter, or support. In the chemical and petrochemical industries, products worth billions of dollars are generated every year through processes that use metal or metal oxide catalysts [2]. For the control of environmental pollution, catalysts or sorbents that contain metal oxides are employed to remove CO, NO x , and SO x species formed during the combustion of fossil fuels [3]. The most active areas of the semiconductor industry involve the use of metal oxides [4]. Thus, most of the chips used in computers contain a metal oxide component.When the size of a metal oxide is brought down to the nanometer regime, a number of size-dependent properties arise primarily as a result of surface chemistry [5][6][7]. Metal oxide nanoparticles (NPs) can exhibit unique physical and chemical properties due to their limited size. Particle size is expected to influence three important groups of basic properties in any material. The first one comprises the structural characteristics, namely the lattice symmetry and unit cell parameters [8]. Bulk metal oxides are usually stable systems with well-defined crystallographic structures. With decreasing particle size, thermodynamic stability and cell parameters change and structural transformations may occur [6]. The second important influence of size is related to the electronic properties. With decreasing particle size, the energy of exciton levels of a semiconductor metal oxide shifts and hence the optical band gap changes [7,9]. Structural and electronic properties obviously change the physical and chemical properties of a solid which are the third group of properties influenced by size in a simple classification [6,10].Lanthanum (III) oxide, La 2 O 3 , has the largest band gap of the rare earth oxides (4.3 eV), the lowest lattice energy, and a very high dielectric constant. These properties lead to potential applications such as dielectric layers in devices, Abstract In this work, the nearly pure hexagonal phase of lanthania nanoparticles (NPs) was successfully synthesized using three methods: microwave, sol-gel, and hydrothermal. The samples were characterized using nine techniques including powder X-ray powder diffraction, thermogravimetry, transmission electron microscopy, scanning electron microscopy, field emission microscopy, energy-dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, far infrared spectroscopy, and ultraviolet-visible absorption spectroscopy. This study showed that the method of synthesizing lanthania NPs can affect the size, which in turn has impact on structural, morphological, and optical properties.

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Influence of preparation methods of microwave, sol–gel, and hydrothermal on structural and optical properties of lanthania nanoparticles

2015

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“…A zero-dimension material, quantum dots (QDs) exhibit very small dimensions of 2-10 nm, and these molecules have diameters of about 10-50 atoms. 2 Due to their small size, they exhibit larger surface areas of the crystals, the highest valence, and the lowest conduction bands, and they release more energy when the crystals return to their resting state. Another category is the larger dimensions of QDs, which are nanoparticles (NPs) in the range of 1-100 nm, and it is assumed that QDs and NPs are very small in size and shape in nanostructure family.…”

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confidence: 99%

<p>Gold quantum dots impair the tumorigenic potential of glioma stem-like cells via β-catenin downregulation in vitro</p>

Wahab¹,

Kaushik²,

Khan³

et al. 2019

IJN

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Background: Over the past several decades, the incidence of solid cancers has rapidly increased worldwide. Successful removal of tumor-initiating cells within tumors is essential in the field of cancer therapeutics to improve patient disease-free survival rates. The biocompatible multivarient-sized gold nanoparticles (MVS-GNPs) from quantum dots (QDs, ,10 nm) to nanosized (up to 50 nm) particles have vast applications in various biomedical areas including cancer treatment. The role of MVS-GNPs for inhibition of tumorigenic potential and stemness of glioma was investigated in this study. Methods: Herein, MVS-GNPs synthesized and characterized by means of X-ray diffraction pattern (XRD) and transmission electron microscopy (TEM) techniques. Afterwards, interaction of these GNPs with glioma stem-cell like cells along with cancer cells were evaluated by MTT, cell motility, self-renewal assays and biostatistics was also applied. Results: Among these GNPs, G-QDs contributed to reduce metastatic events and spheroid cell growth, potentially blocking the self-renewal ability of these cells. This study also uncovers the previously unknown role of the inhibition of CTNNB1 signaling as a novel candidate to decrease the tumorigenesis of glioma spheroids and subsequent spheroid growth. The accurate and precise biostatistics results were obtained at quantify level. Conclusion: In summary, G-QDs may exhibit possible contribution on suppressing the growth of tumor-initiating cells. These data reveal a unique therapeutic approach for the elimination of residual resistant stem-like cells during cancer treatment.

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“…Secondly, particle size of MOs is connected to the electronic properties. If the size of particle reduces, the energy of exciton levels of a semiconductor MOs displaces and therefore the optical band gap of the MOs varies [12]. When the structural and electronic properties of MOs vary, they evidently switch the physical as well as chemical properties of a MOs.…”

Section: Introductionmentioning

confidence: 99%

Influence of calcination on the sol–gel synthesis of lanthanum oxide nanoparticles

et al. 2018

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Sonochemical synthesis and measurement of optical properties of zinc sulfide quantum dots

Cited by 63 publications

References 29 publications

Influence of preparation methods of microwave, sol–gel, and hydrothermal on structural and optical properties of lanthania nanoparticles

Influence of preparation methods of microwave, sol–gel, and hydrothermal on structural and optical properties of lanthania nanoparticles

<p>Gold quantum dots impair the tumorigenic potential of glioma stem-like cells via β-catenin downregulation in vitro</p>

Influence of calcination on the sol–gel synthesis of lanthanum oxide nanoparticles

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Sonochemical synthesis and measurement of optical properties of zinc sulfide quantum dots

Cited by 63 publications

References 29 publications

Influence of preparation methods of microwave, sol–gel, and hydrothermal on structural and optical properties of lanthania nanoparticles

Influence of preparation methods of microwave, sol–gel, and hydrothermal on structural and optical properties of lanthania nanoparticles

<p>Gold quantum dots impair the tumorigenic potential of glioma stem-like cells via &beta;-catenin downregulation in vitro</p>

Influence of calcination on the sol–gel synthesis of lanthanum oxide nanoparticles

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<p>Gold quantum dots impair the tumorigenic potential of glioma stem-like cells via β-catenin downregulation in vitro</p>