The path to stoichiometric composition of III–V binary quantum dots through plasma/ion-assisted self-assembly

Rider, Amanda; Ostrikov, Kostya Ken

doi:10.1016/j.susc.2008.11.030

Cited by 9 publications

(5 citation statements)

References 77 publications

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“…27 Furthermore, it is also worth to mention that there are reports on the growth of graded Si 1Àx C x , InSb and GaAs QDs via the plasma-assisted nano-assembly. [30][31][32][33] In these studies, it was shown that the grading of elemental composition in the QDs can be controlled systematically. Interestingly, the plasma-assisted growth mechanism has been successfully implemented experimentally to synthesize the Si 1Àx C x QD arrays 34 and iron oxide nanostructures.…”

Section: Analysis I: CD 1àx Zn X Se/znsementioning

confidence: 99%

Non-square-well potential profile and suppression of blinking in compositionally graded Cd1−xZnxSe/CdxZn1−xSe nanocrystals

et al. 2010

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Random blinking is a major problem on the way to successful applications of semiconducting nanocrystals in optoelectronics and photonics, which until recently had neither a practical solution nor a theoretical interpretation. An experimental breakthrough has recently been made by fabricating non-blinking Cd(1-x)Zn(x)Se/ZnSe graded nanocrystals [Wang et al., Nature, 2009, 459, 686]. Here, we (1) report an unequivocal and detailed theoretical investigation to understand the properties (e.g., profile) of the potential-well and the distribution of Zn content with respect to the nanocrystal radius and (2) develop a strategy to find the relationship between the photoluminescence (PL) energy peaks and the potential-well due to Zn distribution in nanocrystals. It is demonstrated that the non-square-well potential can be varied in such a way that one can indeed control the PL intensity and the energy-level difference (PL energy peaks) accurately. This implies that one can either suppress the blinking altogether, or alternatively, manipulate the PL energy peaks and intensities systematically to achieve a controlled non-random intermittent luminescence. The approach developed here is based on the ionization energy approximation and as such is generic and can be applied to any non-free-electron nanocrystals.

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Section: Analysis I: CD 1àx Zn X Se/znsementioning

confidence: 99%

Non-square-well potential profile and suppression of blinking in compositionally graded Cd1−xZnxSe/CdxZn1−xSe nanocrystals

et al. 2010

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“…Gaseous plasmas represent an ideal fabrication environment for this purpose. A high degree of compositional control during nanoassembly has been demonstrated for plasma-based processes both computationally [113,116,134,135] and experimentally [136][137][138][139][140][141].…”

Section: Tailoring Metal Nanoarraysmentioning

confidence: 99%

Plasmas meet plasmonics

2012

Self Cite

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Abstract. The term 'plasmon' was first coined in 1956 to describe collective electronic oscillations in solids which were very similar to electronic oscillations/surface waves in a plasma discharge (effectively the same formulae can be used to describe the frequencies of these physical phenomena). Surface waves originating in a plasma were initially considered to be just a tool for basic research, until they were successfully used for the generation of large-area plasmas for nanoscale materials synthesis and processing. To demonstrate the synergies between 'plasmons' and 'plasmas', these large-area plasmas can be used to make plasmonic nanostructures which functionally enhance a range of emerging devices. The incorporation of plasmafabricated metal-based nanostructures into plasmonic devices is the missing link needed to bridge not only surface waves from traditional plasma physics and surface plasmons from optics, but also, more topically, macroscopic gaseous and nanoscale metal plasmas. This article first presents a brief review of surface waves and surface plasmons, then describe how these areas of research may be linked through Plasma Nanoscience showing, by closely looking at the essential physics as well as current and future applications, how everything old, is new, once again.

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“…Initially, the quantum dots were used in microelectronics and optoelectronic materials [1,2] , then quantum dots were applied in biological and medical aspects [3,4] due to their visible area unique and excellent fluorescence properties. With the deepening research of quantum dots, quantum dots have been extended to quantitative analysis of heavy metal ions, small organic molecules and drugs [5,6] .…”

Section: Introductionmentioning

confidence: 99%

Near Infrared Emission of Ag2S Quantum Dots and their Fluorescence Quenched by Gold Nanoparticles

Liao

et al. 2015

Procedia Engineering

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The near-infrared emitting Ag 2 S quantum dots (QDs) coated with L-cysteine were prepared by one-pot aqueous synthesis at room temperature. Several characterization methods including X-ray diffraction (XRD), transmission electron microscopy (TEM), fluorescence spectrophotometer (PL) and ultraviolet -visible spectrophotometer (UV-vis) were used to characterize the structure, morphology and optical properties of the samples. The effects of gold nanoparticles on the fluorescence of Ag 2 S QDs were systematically investigated, it was found that gold nanoparticles could enhance or quench the fluorescence intensity of Ag 2 S QDs in some situation. Within a certain range, the fluorescence intensity of Ag 2 S QDs shows a linear quenching proportional to the colloidal gold concentration. Under the optimized experimental conditions, the linear range was obtained for colloidal gold concentration from 5.93 -27.09 ×10 -6 mol/l (r 2 = 0.9956). The determined detection limit (LOD) was about 5.08×10 -6 mol/l. The quenching mechanism of Ag 2 S QDs is discussed. Gold nanoparticles also have similar effects on Ag 2 Te QDs. A new method for the quantitative detection of inorganic nanoparticles was established, and it provides a new way for the bio-analytical applications.

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The path to stoichiometric composition of III–V binary quantum dots through plasma/ion-assisted self-assembly

Cited by 9 publications

References 77 publications

Non-square-well potential profile and suppression of blinking in compositionally graded Cd1−xZnxSe/CdxZn1−xSe nanocrystals

Non-square-well potential profile and suppression of blinking in compositionally graded Cd1−xZnxSe/CdxZn1−xSe nanocrystals

Plasmas meet plasmonics

Near Infrared Emission of Ag2S Quantum Dots and their Fluorescence Quenched by Gold Nanoparticles

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