Study of Photoluminescence of CdS/ZnS Core/Shell Quantum Dots

Fang, Dai-Feng; Zhang, Z.M.; Wang, Z.P.; Ding, Zejun

doi:10.1016/j.phpro.2012.03.657

Cited by 22 publications

(12 citation statements)

References 14 publications

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“…where is the QD radius (variable), is the halfwidth of distribution (14), which is defined by the mean radius¯and the value of expressed in percentages: =¯/100. With refard for all the approximations described above, the absorption coefficient of a heterosystem with the QD takes the form:…”

Section: Light Absorption Coefficient Of the Heterosystem With Qdsmentioning

confidence: 99%

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The Effect of Shallow Impurities on the Light Absorption by the Nanocrystals CdS

2018

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The energy of quantum transitions of exciton-impurity states in a heterosystem with nanocrystals is calculated. The absorption spectra associated with the indicated transitions are analyzed. It is qualitatively shown that broad luminescence bands in the red region are related to the impurity acceptor states, and the high narrow ones in the violet region to pure excitonic states and excitonic states interacting with the ion of a donor. The satisfactory quantitative agreement of our calculations with experimental data for high energy luminescence bands is obtained.

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Section: Light Absorption Coefficient Of the Heterosystem With Qdsmentioning

confidence: 99%

“…There is a significant number of experimental works on the luminescence and the absorption of electromagnetic waves by nanocrystals [10][11][12][13][14][15]. The authors of these and other papers obtained the dependences of the luminescence intensity on the average size of nanocrystals and the wavelength.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Shallow Impurities on the Light Absorption by the Nanocrystals CdS

2018

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“…Cadmium sulfide (CdS) is often the nanoparticle semiconductor of first choice because of the ease of its fabrication: there is no high‐temperature, anaerobic chemistry involved and no molten solvents (Yang and Paul, ). Instead, CdS QD fabrication employs a reverse micelle aqueous solution in which the micelle's size dictates the size of the nanoparticle (Peng and Peng, ).…”

Section: Qd Materialsmentioning

confidence: 99%

“…Instead, CdS QD fabrication employs a reverse micelle aqueous solution in which the micelle's size dictates the size of the nanoparticle (Peng and Peng, ). Based on early semiconductor nanoparticle research on CdSe and ZnS (Kortan et al ., ), Yang and Paul () found that various reverse micelle methods can be used to produce both plain CdS QDs and CdS QDs doped with Mn. The difficulty with this method is that the resulting nanoparticle colloids are not monodisperse.…”

Section: Qd Materialsmentioning

confidence: 99%

Microbial synthesis of chalcogenide semiconductor nanoparticles: a review

Jacob

Lens

Balakrishnan

2015

Microbial Biotechnology

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SummaryChalcogenide semiconductor quantum dots are emerging as promising nanomaterials due to their size tunable optoelectronic properties. The commercial synthesis and their subsequent integration for practical uses have, however, been contorted largely due to the toxicity and cost issues associated with the present chemical synthesis protocols. Accordingly, there is an immediate need to develop alternative environment‐friendly synthesis procedures. Microbial factories hold immense potential to achieve this objective. Over the past few years, bacteria, fungi and yeasts have been experimented with as eco‐friendly and cost‐effective tools for the biosynthesis of semiconductor quantum dots. This review provides a detailed overview about the production of chalcogen‐based semiconductor quantum particles using the inherent microbial machinery.

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“…For example, an otherwise non-magnetic material such as gold, cobalt or silica could be combined with iron oxide in a core-shell model, to obtain magnetic properties. 97 Due to the multi-functionality of these nanostructures, core-shell nanoparticles are growing in popularity for a wide range of applications including biomedical 99,100 and pharmaceutical 101 applications, catalysis 52,102 , electronics 103,104 and enhancing photoluminescence [105][106][107] . From a more specific standpoint, biotechnology has benefited from the use of core-shell nanoparticles in drug delivery and release 100,108,109 , bioimaging 100,110,111 , and biosensing 112,113 .…”

Section: Core-shell Nanoparticlesmentioning

confidence: 99%

Gold Nanoparticles as a Platform for Small Molecule SELEX

Smith¹

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Both naturally occurring and synthetic small molecules play a significant role in a variety of applications. For example, small molecule food contaminants that occur infield or postharvest are of importance, both agriculturally and economically. Mycotoxins are toxic secondary metabolites produced by filamentous fungi that can potentially contaminate a variety of foodstuffs. Detection of these small molecules is required as mycotoxins pose multiple health-risks and proceed past processing and food safety.Current detection methods are expensive, time consuming and unavailable for on-site detection leaving an unmet need for alternative methods of detection.Aptamers are single stranded oligonucleotides that can bind to specific target molecules with high selectivity and affinity. Emerging as molecular recognition agents, aptamers can be used in a number of novel detection methods for small molecule quantification and analysis. Aptamers are selected through an in vitro process known as Systematic Evolution of Ligands by Exponential Enrichment (SELEX). Aptamers can be adsorbed onto the surface of citrate-capped AuNPs to serve as the molecular recognition element of a rapid colourimetric biosensor assay. Based on this interaction, AuNPs could potentially serve as a novel platform for small molecule SELEX. Although molecular recognition of small molecules is of great interest, selection of aptamers for small molecules has proven to be a challenge. Furthermore, not all of these reported small molecule aptamers can be easily incorporated in the AuNP bioassay. Selecting for aptamers in a manner that will mimic established AuNP biosensor conditions provides a number of advantages compared to traditional SELEX. As a first step towards establishing a AuNP SELEX platform, we evaluated the partitioning of mycotoxin iv aptamers that remain on the AuNP surface from aptamers-target complexes in solution.Having uncovered several challenges associated with AuNPs as a SELEX partitioning strategy, we next synthesized, optimized, and characterized core-shell gold coated magnetic nanoparticles (Fe3O4-AuNPs), which were phase-transferred aqueous solution.We demonstrated that Fe3O4-AuNPs could function as an improved AuNP SELEX platform and provide a novel method to study ssDNA aptamer-AuNP non-specific interactions. Finally, our studies on the adsorption and separation of ssDNA aptamers using Fe3O4-AuNPs highlight future opportunities for novel aptamer biomedical applications and other biosensor development.v

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Study of Photoluminescence of CdS/ZnS Core/Shell Quantum Dots

Cited by 22 publications

References 14 publications

The Effect of Shallow Impurities on the Light Absorption by the Nanocrystals CdS

The Effect of Shallow Impurities on the Light Absorption by the Nanocrystals CdS

Microbial synthesis of chalcogenide semiconductor nanoparticles: a review

Gold Nanoparticles as a Platform for Small Molecule SELEX

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