Surface-Bound Carbonyl Compounds as Lewis Acids. Photoluminescence as a Probe for the Binding of Ketones and Aldehydes to Cadmium Sulfide and Cadmium Selenide Surfaces

Kepler, Keith D.; Lisensky, George C.; Patel, Manish; Sigworth, L. A.; Ellis, Arthur B.

doi:10.1021/j100043a047

Cited by 37 publications

(45 citation statements)

References 3 publications

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“…First, the initial fast nucleation generating new emitting species i.e. CdS NPs, resulting in an increase in PL intensity and second, growth and surfactant adsorption lead to further increase/decrease in PL intensity due to change in the surface states [35]. The contribution from the first factor i.e.…”

Section: Steady-state Pl Properties Of Growing Cds Npsmentioning

confidence: 99%

Varying photoluminescence emission of CdS nanoparticles in aqueous medium: A comparative study on effect of surfactant structure

Kumar¹,

Mehta

2015

Nano-Structures & Nano-Objects

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Section: Steady-state Pl Properties Of Growing Cds Npsmentioning

confidence: 99%

Varying photoluminescence emission of CdS nanoparticles in aqueous medium: A comparative study on effect of surfactant structure

Kumar¹,

Mehta

2015

Nano-Structures & Nano-Objects

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“…Cordero et al suggest that surface adsorbates, specifically water molecules, are responsible for the initial Pl activation of CdSe QDs in monolayer Langmuir film [27]. The irradiation of the QDs monolayer has the effect of quasi-inverse H 2 O molecule physisorption on the nanocrystal surface and passivation of surface traps similar to the enhancement of the luminescence QY observed upon adsorption of electron-donating molecules (Lewis bases) to bulk CdSe surfaces [28]. Wang et al [29] hypothesized that the initial Pl enhancement of CdSe QDs in densely packed film is mainly due to the Foerster energy transfer process [30].…”

Section: Resultsmentioning

confidence: 99%

Influence of the Shell Thickness and Ratio Between Core Elements on Photostability of the CdTe/CdS Core/Shell Quantum Dots Embedded in a Polymer Matrix

2016

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This paper reports a study of photooxidation and photomodification processes of the CdTe/CdS quantum dots embedded in a polymer matrix under ambient condition. During the first few minutes of irradiation, the quasi-inverse increase in photoluminescence intensity has been observed indicating the passivation of the nanocrystal surface traps by water molecules. A prolonged irradiation of the polymer film containing CdTe/CdS quantum dots leads to a significant decrease in the photoluminescence intensity together with the “blue shift” of the photoluminescence peak energy associated with quantum dot photooxidation. The mechanisms of the CdTe/CdS core/shell quantum dot photooxidation and photomodification in a polymer matrix are discussed. We have found a correlation between the photostability of the quantum dots and the CdS shell thickness as well as the ratio of core elements.

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“…The role of the surface in determining the luminescence quantum yields of semiconductors has long been recognized [3][4][5][6][23][24][25]33,34,[50][51][52] and has been ascribed to the higher concentration of defects at the surface (e.g., unsaturated bonds, ion vacancies, or disorder), which gives rise to a high density of mid-gap states acting as electron and hole traps. [50][51][52] The surface properties are expected to have a large influence on the optical properties of semiconductor nanocrystals, because of the high surface-to-volume ratio of small particles. [3][4][5][6] To understand how the growth conditions determine the surface structure of CdSe nanocrystals, we will first discuss the contribution of each individual parameter (i.e., growth temperature and Cd:Se ratio) and later consider the effect of their combination.…”

Section: Discussionmentioning

confidence: 99%

Single‐Step Synthesis to Control the Photoluminescence Quantum Yield and Size Dispersion of CdSe Nanocrystals.

et al. 2003

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Luminescence Luminescence D 6540Single-Step Synthesis to Control the Photoluminescence Quantum Yield and Size Dispersion of CdSe Nanocrystals. -Colloidal CdSe nanocrystals are prepared using a one-pot synthesis in trioctylphosphine oxide/hexadecylamine/trioctylphosphine as the coordinating solvent. By a judicious choice of the Cd:Se ratio (1:5) and the growth temperature (240°C) highly luminescent nearly monodisperse CdSe nanocrystals are reproducibly obtained without any postpreparative treatment. The samples show high (up to approximately 90%) and reproducible ensemble band-edge photoluminescence quantum yields, relatively long time periods (60-120 min) during the growth over which the quantum yields are at maximum, and no spreading of the narrow particle size distribution. -(DE MELLO DONEGA*, C.; HICKEY, S. G.; WUISTER, S. F.; VANMAEKELBERGH, D.; MEIJERINK, A.; J. Phys. Chem. B 107 (2003) 2, 489-496; Debye Inst., Univ. Utrecht, NL-3508 TA Utrecht, Neth.; Eng.) -W. Pewestorf 12-010

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Surface-Bound Carbonyl Compounds as Lewis Acids. Photoluminescence as a Probe for the Binding of Ketones and Aldehydes to Cadmium Sulfide and Cadmium Selenide Surfaces

Cited by 37 publications

References 3 publications

Varying photoluminescence emission of CdS nanoparticles in aqueous medium: A comparative study on effect of surfactant structure

Varying photoluminescence emission of CdS nanoparticles in aqueous medium: A comparative study on effect of surfactant structure

Influence of the Shell Thickness and Ratio Between Core Elements on Photostability of the CdTe/CdS Core/Shell Quantum Dots Embedded in a Polymer Matrix

Single‐Step Synthesis to Control the Photoluminescence Quantum Yield and Size Dispersion of CdSe Nanocrystals.

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