Anti-human DNP Conjugated Cd Quantum Dots
Product Description
Alfa Chemistry offers anti-human DNP Conjugated Cd quantum dots, which are widely used in bioimaging and optoelectronic devices. Alfa Chemistry can provide customers with anti-human DNP Conjugated Cd quantum dots in the emission spectral range from 525 nm to 665 nm, with excellent chemical and optical stability, good quality stability and high quantum yield.
Applications
Photonic Environmental Engineering
Photo-induced dynamic nuclear spin polarization (DNP) in semiconductor quantum dots (QDs) requires many cycles of excitation of spin-polarized carriers and carrier recombination. Therefore, the radiative lifetime of the exciton containing electrons becomes one of the limiting factors for DNP. In principle, changing the radiative lifetime of the exciton will affect the DNP and thus the nuclear spin polarization. Fong et al. demonstrated the manipulation of the DNP in a single QD by photonic environmental engineering using a two-dimensional photonic crystal. The degree of achievable nuclear spin polarization can be controlled by modifying the radiative lifetime of the exciton. The results show that achieving higher degrees of nuclear spin polarization through photonic environmental engineering is promising, which has implications for spin-based quantum information processing.
![Fig. 1 (a) Schematic figure showing the three basic steps involved in the process of DNP with [Math Processing Error] in a QD. In the case of (b) short exciton lifetime, more spin exchanges between electron and nuclei can occur within a period of time than that of (c) long lifetime. (Fong et al.,2017)](/upload/image/Anti-human-DNP-Conjugated-Cd-Quantum-Dots-1.png)
Fig. 1 (a) Schematic figure showing the three basic steps involved in the process of DNP with [Math Processing Error] in a QD. In the case of (b) short exciton lifetime, more spin exchanges between electron and nuclei can occur within a period of time than that of (c) long lifetime. (Fong et al.,2017)
NMR Toolbox
Multidimensional 113Cd dynamic nuclear polarization (DNP) enhanced NMR spectroscopy allows to resolve signals from the different atomic and magnetic environments of NC cores and surfaces. This allowed Laura et al. to determine structural perfection and to distinguish between surface and core atoms of all major forms of size and shape engineered CdSe NCs. Irregularly faceted quantum dots (QDs) and atomically flat nanoparticles, including major polycrystals (Zn-Brand and Woods bodies) and their epitaxial nanoheterostructures (CdSe/CdS core/shell quantum dots and CdSe/CdS core/crown nanoparticles), as well as magically sized CdSe clusters. The NMR signals were assigned to specific crystal faces of CdSe NCs with oleate-terminated ZB structures. Although both QD polycrystals have apparently the same optical quality, the atomic complexity of the surface structure and species distribution of the oleate bodies is much higher than that of the Zn-Brand CdSe QD.
Fig. 2 (a) Atomic model of a cadmium-terminated core/shell CdSe/CdS NPL. In the absorption spectrum (b), the excitonic peaks of the CdS and CdSe regions of the oleate-capped core/crown CdSe/CdS NPLs are clearly visible. (c)DNP enhanced PASS–PIETA spectrum. (Laura et al., 2018)
Alfa Chemistry can provide a variety of complex and customized fluorescent quantum dot products. Our products involve perovskites precursors, perovskites quantum dots, quantum dot kit, single layer quantum dots, upconverting nanoparticles and other fluorescent quantum dots. Alfa Chemistry provides products with high fluorescence quantum yield, stable quality and relatively low price. Our products are constantly updated. If the product you need is not in our catalog, please feel free to contact us , we provide relevant custom services.
References
- Fong, C. F. , et al. Manipulation of dynamic nuclear spin polarization in single quantum dots by photonic environment engineering[J]. Physical Review B Condensed Matter & Materals Physics, 2017, 95(24):245423.1-245423.5.
- Laura, P. , et al. Resolving the Core and the Surface of CdSe Quantum Dots and Nanoplatelets Using Dynamic Nuclear Polarization Enhanced PASS-PIETA NMR Spectroscopy[J]. Acs Central Science, 2018:acscentsci.8b00196.
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