Recent progress of quantum dots for food safety assessment: A review
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Single dot spectroscopy is performed on two-color CdSe/ZnS/CdSe core/barrier/shell nanostructures. Unlike quantum dots cores, these systems have two phases with which to emit and ultimately examine for blinking analysis. These particles are brighter than conventional quantum dots and also show the photoluminescence (PL) intensity and energy fluctuations characteristic of quantum dots. Single dot spectral diffusion analysis yields no measureable energy shift correlation between the core and the shell on the 200 ms time scale. In contrast, the single dot PL from the CdSe shell has narrower linewidths than the CdSe core, indicating differences in its spectral diffusion on shorter timescales.
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We report here the fluorescence energy transfer between two types of inorganic semiconductor nanocrystals: one is doped (d-dots) with optically active transition metal ion and other one is the undoped quantum dots (q-dots). While the two types of undoped quantum dots do not show significant energy transfer, the doped quantum dots under similar conditions show efficient energy transfer to the undoped one. The difference in the lifetime makes the doped quantum dots as donor for quantum dots. Exploring Cu-doped and Mn-doped d-dots as donor with the suitable size of CdSe q-dots as acceptor, we report here a detailed study of d-dot to q-dot energy transfer and investigate the possible mechanism.
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It is synthesized that the CdS and CdSe quantum dots with the different sizes in the organic phase. The CdS and CdSe quantum dots were assembled into multi-layer composite nanostructures using LB technology. We also investigate the fluorescence resonance energy transfer (FRET) of the quantum dots system and the multi-layer nanostructures. The results reveal that the fluorescence intensity of CdS quantum dots comparatively weaken seriously with the complete volatilization of solvents in CdS and CdSe quantum dots hybrid solution. This results in the enhancing of the FRET rate as minishing the intervals of quantum dots. In multi-layer composite nanostructures, the fluorescence intensity of CdSe quantum dots layer en- hances with increasing the layer number of CdS quantum dots. This shows the increase of FRET rate with adding donor layers.
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The growth of multilayer GaSb(quantum dots)/GaAs and their luminescence property have been studied.The results show that the number of layer seems no obvious effect on the density of quantum dots.However,increasing the number of layer leads to the size of quantum dots becoming larger.Furthermore,the quantum dots accumulate as the number of QD layers reaches to a certain degree and some holes are formed in the location of the quantum dot accumulated,as the thickness of quantum dots increases there will be some holes just on the locations the quantum dots gathered.The results suggest that relatedness effect exists between each quantum layer and the GaAs covering layer can not grow well at the location of the accumulated GaSb quantum dots.As a result,the GaSb quantum dots become accumulate easier and evaporate easier in the following GaSb quantum dots grown,which will lead to the forming of the hole.The PL spectra of GaSb(quantum dots)/GaAs shows a broad photoluminescence peak of quantum dots,due to the broad distribution of the size of the quantum dots.
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Many processes of interest in quantum dots involve charge or energy transfer from one dot to another. Energy transfer in films of quantum dots as well as between linked quantum dots has been demonstrated by luminescence shift, and the ultrafast time-dependence of energy transfer processes has been resolved. Bandgap variation among dots (energy disorder) and dot separation are known to play an important role in how energy diffuses. Thus, it would be very useful if energy transfer could be visualized directly on a dot-by-dot basis among small clusters or within films of quantum dots. To that effect, we report single molecule optical absorption detected by scanning tunneling microscopy (SMA-STM) to image energy pooling from donor into acceptor dots on a dot-by-dot basis. We show that we can manipulate groups of quantum dots by pruning away the dominant acceptor dot, and switching the energy transfer path to a different acceptor dot. Our experimental data agrees well with a simple Monte Carlo lattice model of energy transfer, similar to models in the literature, in which excitation energy is transferred preferentially from dots with a larger bandgap to dots with a smaller bandgap.
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