Surface Passivation of Luminescent Colloidal Quantum Dots with Poly(Dimethylaminoethyl methacrylate) through a Ligand Exchange Process

Wang, Xiao Song; Dykstra, Tieneke E.; Salvador, Mayrose R.; Manners, Ian; Scholes, Gregory D.; Winnik, Mitchell A.

doi:10.1021/ja0489339

Cited by 154 publications

(133 citation statements)

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“…Appropriate passivation of CdSe QDs surface sites is important not only to change the absorption range in the visible region [24,31], but also to obtain high luminescence quantum yields from colloidal quantum dots [27,31]. Although many different passivants have been found empirically to improve the quantum yield of quantum dots [27,31,32], there has been very little work carried out on the influence of surface stoichiometry of CdSe QDs on their optical properties. Hence, it is necessary to pay attention on the properties observed with change in surface composition of CdSe QDs.…”

Section: Introductionmentioning

confidence: 99%

Composition-controlled optical properties of colloidal CdSe quantum dots

Ayele

Chou

et al. 2014

Applied Surface Science

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Section: Introductionmentioning

confidence: 99%

Composition-controlled optical properties of colloidal CdSe quantum dots

Ayele

Chou

et al. 2014

Applied Surface Science

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“…In the same manner as other nanoscale materials, bulk nanoparticles can self assemble into arrays or superstructures. [24,25] They can be functionalized with polymers [26] and can be blended into mechanical mixtures to form composite materials such as nanocrystal-polymer films. [27] We envision that bulk nanoparticles can occupy a complementary role to quantum confined structures as another building block for the development of new technologies.…”

mentioning

confidence: 99%

Demonstration of Bulk Semiconductor Optical Properties in Processable Ag₂S and EuS Nanocrystalline Systems

et al. 2008

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Semiconductor nanocrystals (NCs) are colloidal single crystals that have been widely examined in recent years to elucidate the origins and applications of size-tunable properties. Size-tunable optical properties are particularly desirable for applications in light-emitting devices, lasers, and biological labeling. [1][2][3][4][5] Strong confinement effects, characteristic of many NCs (''quantum dots''), give them an electronic structure more like molecules than semiconductors and this is of special interest in areas such as quantum information.[6] However, while all colloidal quantum dots are NCs, not all NCs are colloidal quantum dots. This distinction between bulk and confined nanocrystals is not always obvious depending on the characteristics of the bulk band structure. In this paper we show that the optical spectra of bulk semiconductor NCs can exhibit surprising features that may be confused with quantum confinement effects. We compare the optical properties of two bulk nanocrystal systems, Ag 2 S and EuS.Bulk semiconductors have revolutionized a breadth of technologies as a consequence of the way electronic levels form delocalized bands. Although the development of new quantum dot systems have dominated semiconductor nanocrystal research, we suggest that the field of bulk NC synthesis and characterization is complementary to the well-established field of quantum-confined NCs, and offers great potential for the discovery of materials that exploit the desirable electronic and magnetic attributes of bulk semiconductors on the nanoscale. A key advantage foreseen for these NCs is that they are easily processed and they can potentially be programmed for intelligent self-assembly. [7] The realization of the scope and potential of nanoscience has stimulated the discovery of many routes for semiconductor quantum dot synthesis. Many of these reports seek to demonstrate quantum-confinement effects; that is, size-tunable absorption features as demonstrated in compelling pioneering work. [8,9] Compared to the extensive amount of research directed towards creating novel quantum dot systems, little work has been directed towards thinking about the potential of colloidal synthesis for the miniaturization of semiconductors while retaining the essential attributes of the bulk material. There are some notable exceptions to this including nanocrystalline TiO 2 which has been extensively studied for use in photovoltaics.[10] Bulk semiconductors have been, and continue to be, essential components in almost all aspects of technology. They differ from quantum-confined semiconductors in that carriers are located in bands rather than discrete energy levels, thus producing the well-known electronic properties. Nanocrystals that have these same properties could potentially find wide application in micro-and nanoelectronics because they may facilitate processing of devices on small length scales without introducing complicating quantum effects. These materials would exploit the advantages of nanocrystals, such as enhanced processabilit...

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“…1e), a spherical nanocomposite assembly could be observed. In general, the hydrodynamic diameters of PDMAEMA-capped single QDs were less than 10 nm for PDMAEMA polymers of various molecular weights [23,24]. Because the sizes of QDs were no larger than 4 nm in our experiments while diameters of these micelles were at least 35 nm, it was reasonable to conclude that the self-assembly was induced by CdTe-TGA QDs.…”

Section: Formation Of Qds/peg-b-pdmaema Nanocomposite Assembliesmentioning

confidence: 56%

Formation of luminescent nanocomposite assemblies via electrostatic interaction

Jin

Yang

et al. 2008

Journal of Colloid and Interface Science

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Surface Passivation of Luminescent Colloidal Quantum Dots with Poly(Dimethylaminoethyl methacrylate) through a Ligand Exchange Process

Cited by 154 publications

References 14 publications

Composition-controlled optical properties of colloidal CdSe quantum dots

Composition-controlled optical properties of colloidal CdSe quantum dots

Demonstration of Bulk Semiconductor Optical Properties in Processable Ag₂S and EuS Nanocrystalline Systems

Formation of luminescent nanocomposite assemblies via electrostatic interaction

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Surface Passivation of Luminescent Colloidal Quantum Dots with Poly(Dimethylaminoethyl methacrylate) through a Ligand Exchange Process

Cited by 154 publications

References 14 publications

Composition-controlled optical properties of colloidal CdSe quantum dots

Composition-controlled optical properties of colloidal CdSe quantum dots

Demonstration of Bulk Semiconductor Optical Properties in Processable Ag2S and EuS Nanocrystalline Systems

Formation of luminescent nanocomposite assemblies via electrostatic interaction

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Demonstration of Bulk Semiconductor Optical Properties in Processable Ag₂S and EuS Nanocrystalline Systems