Effect of the nature of dispersion medium on the CdTe/TGA nanocrystal formation in colloidal solutions and polymeric membranes

Kapush, O.A.; Boruk, S. D.; Boruk, O.S.; Budzulyak, S. I.; Kulchytsky, B.N.; Kosinov, O.G.; Trishchuk, L.I.; Mazarchuk, I.O.; Morozovska, V.J.; Dzhagan, Volodymyr; Hatilov, S.E.; Корбутяк, Дмитро Васильович

doi:10.15407/spqeo23.02.160

Cited by 2 publications

(3 citation statements)

References 22 publications

(31 reference statements)

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“…In particular, the synthesis of in situ polymer-stabilized CdSe, CdSe/CdS, and CdSe/ZnS NCs and the preparation of NC/polymer films was described in Reference [ 36 ]. Synthesis of CdTe NCs stabilized with thioglycolic acid (TGA) in aqueous solution was reported in References [ 37 , 38 ] and of acetate-stabilized ZnO NCs in dimethyl sulfoxide (DMSO) in Reference [ 39 ]. For CdTe and ZnO NCs, NC/polymer films were prepared by mixing of the initial NC solution with different amounts of aqueous solution (approx.…”

Section: Methodsmentioning

confidence: 99%

Photoinduced Enhancement of Photoluminescence of Colloidal II-VI Nanocrystals in Polymer Matrices

et al. 2020

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The environment strongly affects both the fundamental physical properties of semiconductor nanocrystals (NCs) and their functionality. Embedding NCs in polymer matrices is an efficient way to create a desirable NC environment needed for tailoring the NC properties and protecting NCs from adverse environmental factors. Luminescent NCs in optically transparent polymers have been investigated due to their perspective applications in photonics and bio-imaging. Here, we report on the manifestations of photo-induced enhancement of photoluminescence (PL) of aqueous colloidal NCs embedded in water-soluble polymers. Based on the comparison of results obtained on bare and core/shell NCs, NCs of different compounds (CdSe, CdTe, ZnO) as well as different embedding polymers, we conclude on the most probable mechanism of the photoenhancement for these sorts of systems. Contrary to photoenhancement observed earlier as a result of surface photocorrosion, we do not observe any change in peak position and width of the excitonic PL. Therefore, we suggest that the saturation of trap states by accumulated photo-excited charges plays a key role in the observed enhancement of the radiative recombination. This suggestion is supported by the unique temperature dependence of the trap PL band as well as by power-dependent PL measurement.

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Section: Methodsmentioning

confidence: 99%

Photoinduced Enhancement of Photoluminescence of Colloidal II-VI Nanocrystals in Polymer Matrices

et al. 2020

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“…In this work, we studied the effect of colloidal Au NPs on the PL spectra of colloidal QDs synthesized at mild conditions in aqueous solutions, using thioglycolic acid as a stabilizer [22][23][24]. We observe that the PL intensity can be enhanced or reduced depending on the relative spectral position of the QD PL and LSPR band of Au NPs, as well as on the kind of dispersion medium (solvent) and the presence of additional stabilizers, such as polymers.…”

Section: Introductionmentioning

confidence: 99%

“…The PL spectra of QDs can contain not only the narrow and tunable excitonic (interband) PL band, which is valuable for applications but also a broad band related to surface states, which compete with excitonic recombination and are regarded as a drawback for most QD application [21]. The advantage of CdTe QDs is the absence or negligible intensity of this defect-related band, even for QDs obtained at low-temperature and other mild conditions, in particular at room-temperature colloidal synthesis in aqueous media [22][23][24][25]. This fact is an additional motivation for the investigation of CdTe QDs for optical and optoelectronic applications.…”

Section: Introductionmentioning

confidence: 99%

Tuning the photoluminescence of CdTe quantum dots by controllable coupling to plasmonic Au nanoparticles

Dzhagan

Kapush

Isaeva

et al. 2022

Phys. Chem. Solid St.

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A controllable variation of the photoluminescence (PL) intensity of semiconductor quantum dots (QDs) via their coupling to plasmonic nanoparticles (NPs) is the potential basis for optoelectronic and sensing applications. In this work, the effect of Au NPs on the PL of colloidal CdTe QDs is investigated in solution and solid films. An PL enhancement for the QDs synthesized in water was observed in case of spectral overlap of the plasmon absorption band of and QD PL band. In case of Au NPs synthesized in dimethyl sulfoxyl the trend is to reduction of the PL intensity. For the reference samples prepared by mixing QDs not with Au NP solutions but with corresponding pure solvent, certain PL enhancement was observed and presumably attributed to reduction of self-absorption or non-radiative interparticle interaction in less concentrated QD solution. However, the contribution of this dilution-related enhancement is expected to be independent of the spectral properties of NPs and QDs. Therefore, the observed in this work different behavior of QD PL in certain combinations of QDs and NPs is attributed to interaction between electronic excitation in the QD and plasmon.

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Effect of the nature of dispersion medium on the CdTe/TGA nanocrystal formation in colloidal solutions and polymeric membranes

Cited by 2 publications

References 22 publications

Photoinduced Enhancement of Photoluminescence of Colloidal II-VI Nanocrystals in Polymer Matrices

Photoinduced Enhancement of Photoluminescence of Colloidal II-VI Nanocrystals in Polymer Matrices

Tuning the photoluminescence of CdTe quantum dots by controllable coupling to plasmonic Au nanoparticles

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