Semiconductor olefin adducts. Photoluminescent properties of cadmium sulfide and cadmium selenide in the presence of butenes

Meyer, Gerald J.; Leung, Larry K.; Yu, Jimmy C.; Lisensky, George C.; Ellis, Arthur B.

doi:10.1021/ja00196a020

Cited by 36 publications

(13 citation statements)

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“…Therefore, the presence of the –C=C– group in OA structure is the source for the effect. Such an effect was previously reported for olefins and an increase in PL of CdSe crystal was reported [37]. Also, the theoretical model (Table S1, ESM) confirms an increase in binding energy of a molecule, used for CdSe crystal coating, due to the presence of –C=C– groups in a capping molecule.…”

Section: Resultssupporting

confidence: 85%

Comparative study on coating CdSe nanocrystals with surfactants

Oszwałdowski

Roberts

2013

Microchim Acta

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We have synthesized CdSe nanocrystals (NCs) in sizes from 2.2 to 5.1 nm passivated with hydrophobic trioctylphosphine oxide (TOPO) in combination trioctylphosphine (TOP) or tributylphosphine (TBP) to obtain particles of the type CdSe/TOPO/TOP or CdSe/TOPO/TBP. These NCs were then dispersed in aqueous solution of ionic or non-ionic surfactants (such as stearate, oleic acid, Tween) using a biphase (water and chloroform or hexane) transfer method. It is found that both the structure of the surfactant and the native surface of the ligand govern the coating of the NCs with surfactants. More specifically, the hydrophobicity-hydrophilicity balance of the surfactant regulates the coating efficacy, thereby transferring the NC from the organic to the aqueous phase. The type of ligand on the NCs and the kind of coating surfactant also affect photoluminescence (PL). The ratio of PL and absorbance unit (defined as PL per 0.1 AU) was implemented as a tool to monitor changes in PL intensity and wavelength as a function of size, coatings and surface defects. Finally, the distribution of CdSe nanocrystals between pseudophases in cloud point extraction was discussed based on experimental results. It was concluded that the size of CdSe nanocrystal present in an appropriate pseudophase is correlated with the way in which the non-ionic surfactant coats CdSe nanocrystals.FigureCoating of CdSe semiconductor nanocrystals with surfactants impacts nanocrystals’ spectral features. Absorbance of first exciton absorption band was used to estimate ability of surfactant to disperse CdSe nanocrystals. Photoluminescence (PL) intensity and position of PL band were analysed in terms of nanocrystal’s surface phenomena via surfactants applied for coating.Electronic supplementary materialThe online version of this article (doi:10.1007/s00604-013-1062-z) contains supplementary material, which is available to authorized users.

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Section: Resultssupporting

confidence: 85%

Comparative study on coating CdSe nanocrystals with surfactants

Oszwałdowski

Roberts

2013

Microchim Acta

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“…During the last couple of decades, there has been extensive investigation into chemical treatments based on inorganic or organic compounds that interact with the nanowire surface and stabilize it. [72][73][74][75][76] Because of the structural versatility and flexibility, organic molecules are better linkers than inorganic counterparts. They may be designed to incorporate several properties simultaneously and allow systematic modifications of one specific property independently of others.…”

Section: Adsorption Of Dicarboxylic Acids On Cdte Nanowiresmentioning

confidence: 99%

Electronic structure and band gap engineering of CdTe semiconductor nanowires

2012

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“…From the above discussion it is obvious that aP may differ widely upon minor changes in catalyst preparation and solution composition. Higher light intensities may increase surface recombination [60], and photophysical processes like emission are strongly influenced by adsorbed impurities [61,62]. It has been reported that different grinding times of ZnS powder enhances its photocatalytic activity in the isomerization of olefins [63] through the generation of reactive surface states.…”

Section: ) Kinetic Aspectsmentioning

confidence: 99%

“…Their relative importance strongly depends on the presence of energy levels localized within the band-gap. It is well known from ESR [60,61,851 and emission spectra [8S] that most of these metal sulfide powders contain surface states. They are introduced during preparation of the powder as a result of lattice defects [63, 871, trapped holes [85], surface impurities [88] and metallization [38], and during the actual catalytic reaction as a consequence ol irradiation and substrate adsorption.…”

Section: ) Photocorrosionmentioning

confidence: 99%

Preparative Photoreactions catalyzed by semiconductor powders

Kisch

1994

J. Prakt. Chem.

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Semiconductor olefin adducts. Photoluminescent properties of cadmium sulfide and cadmium selenide in the presence of butenes

Cited by 36 publications

References 0 publications

Comparative study on coating CdSe nanocrystals with surfactants

Comparative study on coating CdSe nanocrystals with surfactants

Electronic structure and band gap engineering of CdTe semiconductor nanowires

Preparative Photoreactions catalyzed by semiconductor powders

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