Quantum dots core-shell

Dabbousi, B. O., Rodriguez-Viejo, J., Mikulec, F. V, Heine, J. R., Mattoussi, H., Ober, R., Jensen, K. F. and Bawendi, M. G. (1997) (CdSe)ZnS core-shell quantum dots synthesis and characterization of a size series of highly luminescent nanocrystallites. J. Phys. Chem. B, 101, 9463-9475. 

Hering, V. R., Gibson, G., Schumacher, R. I., Faljoni-Alario, A. and Politi, M. J. (2007). Energy transfer between CdSe/ZnS core/shell quantum dots and fluorescent proteins. Bioconjug. Chem. 18, 1705-8. 

Huang, B., and Tomalia, D.A. (2005) Dendronization of gold and CdSe/cdS (core-shell) quantum dots with tomalia type, thiol core, functionalized poly(amidoamine) (PAMAM) dendrons. J. Lumin. Ill, 215-223. 

Robelek R, Stefani FD, Knoll W (2006) Oligonucleotide hybridization monitored by surface plasmon enhanced fluorescence spectroscopy with bio-conjugated core/shell quantum dots. Influence of luminescence blinking. Phys Status Solidi A-Appl Mater Sci 203 3468-3475... 

Wang S, Jarrett BR, Kauzlarich SM, Louie AY (2007) Core/Shell quantum dots with high relaxivity and photoluminescence for multimodality imaging. J Am Chem Soc 129 3848-3856... 

Fig. 7 Schematic representation of CdS Mn/ZnS core shell quantum dot surface fimction-alized with silane compounds...

Micic 01, Smith BB, Nozik AJ (2000) Core-shell quantum dots of lattice-matched ZnCdSe2 shells on InP cores Experiment and theory. J Phys Chem B 104 12149-12156... 

When HRTEM is used for examining nanoparticles of oxides, in which the proportion of surface area greatly increases, most structural information concerns the surface. For example, HRTEM images of core-shell quantum dots can show the shell structure and its thickness directly. HRTEM images of metal oxide nanotubes can also be regarded as surface profile images. The appHcation of TEM in nanomaterials will be further discussed below. 

Two different nanomaterials, namely colloidal core / shell Quantum Dots (QDs) and Quantum Rods (QRs) were synthesized as described in [51]. In the case of CdSe / ZnS QDs, the synthesis yielded samples emitting at Inux = 580 nm widi a spectral width of the fluorescence emission of 40 nm. CdSe quantum rods showed an emission peak centered at l x = 567 nm with similar linewidth. The NCs were subsequently dispersed in PMMA and deposited onto the substrate by spin-coating. In order to study tiie influence of the average fluorophore-metallic surface distance on the MEF efi t, several thicknesses of the active layer were investigated, finding an o(Aimum value of 35 nm, as measured from the surface of the metallic nanostructures. 

Duong HD, Rhee JI. Use of CdSe/ZnS core-shell quantum dots as energy transfer donors in sensing glucose. Talanta 2007 73 899-905. 

Dabbousi B O ef a/1997 (CdSe)ZnS core-shell quantum dots synthesis and characterization of a size series of highly luminesoent nanoorystallites J. Phys. Chem. B 101 9463... 

The photoluminescence (PL) quantum yield of CdSe/ZnS core-shell quantum dots (QDs) strongly depends on ionic nature of molecules used as solubilizing agents and as molecular templates for further nanoengineering. Quantum yield of PL for initially bright cationic-capped QDs irreversibly decreases to zero. On the contrary, PL and photostability of partially quenched anionic-capped QDs are strongly enhanced upon interaction with cationic polyelectrolyte, which may be more preferable template for this reason. 

Electronic and Optical Properties of Quantum Dots, 563 Type I and Type II Core-Shell Quantum Dots, 565 The Absorption Cross-Sections of Quantum Dots, 565 Absorption and Emission Maxima of Quantum Dots, 567 Luminescence Lifetimes of Q-Dots, 567 Electrochemistry of Nanoparticles, 569 Conclusion, 571 Further Reading, 571 References, 572 Problems, 575 Answers, 576... 

Quantum dots are semiconductors composed of atoms from groups II-VI or III-V elements of the periodic table, for example, CdSe, CdTe, and InP (39). Their brightness is attributed to the quantization of energy levels due to confinement of an eleetron in a three-dimensional box. The optical properties of quantum dots can be manipulated by synthesizing a (usually stabilizing) shell. Such Q-dots are known as core-shell quantum dots, for example, CdSe-ZnS, InP-ZnS, and InP-CdSe. In this section, we will discuss the different properties of quantum dots based on their size and composition. 

Type I and Type II Core-Shell Quantum Dots... 

Fig. 30 Synthesis of (PyMMP-b-P2VP)-CdSe/ZnS core-shell quantum dots. Reproduced with permission from [107]...

W-C. Law, K.-T. Yong, 1. Roy, H. Ding, R. Hu, W.W Zhao, P.N. Paras, Aqueous-phase synthesis of highly luminescent CdTe/ZnTe core/shell quantum dots optimized for targeted bioimaging. Small 5 (2009) 1302-1310. 

R. Ober, K. E Jensen, M. G. Bawendi, (CdSe)ZnS Core-Shell Quantum Dots Synthesis and Characterization of a Size Series of Highly Luminescent Nanocrystallites. The Journal of Physical Chemistry B 1997,101,9463-9475. 

Anni M, Manna L, Cingolani R, Valerini D, Creti A, Lomascolo M Forster energy transfer from blue-emitting polymers to colloidal CdSe/ZnS core shell quantum dots. Appl Phys Lett 2004, 85(18) 4169—4171. 

Anikeeva PO, Madigan CF, Coe-Sullivan SA, Steckel JS, Bawendi MG, Bulo-vic V Photoluminescence of CdSe/ZnS core/shell quantum dots enhanced by... 

For instance. Nightingale et al. [2] developed a continuous in situ synthesis of ZnSe/ZnS core/ shell quantum dots in a microfluidic reaction system. Once the precursors were mixed, the mixture solution was moved to the heating zone for the further nucleation and growth of core and shell of quantum dots. The continuous flow... 

Fig. 8 (A) Functionalization of commercial CdSe/ZnS core-shell quantum dots (CS) with methyl ester N-acetyl-i-cysteine (CysP) and the proposed binding of CysP to the CS surface (B) Proposed interaction between the CysP ligand of CS CysP and the drug (C) Structure of the drugs studied herein. Perez Prieto eta/. Copyright 2013, John Wiley and Sons,...

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