CdTe Nanocrystal Synthesis in SiO<sub>2</sub>/Si Ion‐Track Template: The Study of Electronic and Structural Properties

Balakhayeva, R.; Аkilbekov, A.; Baimukhanov, Zein; Usseinov, А.; Giniyatova, Sh.; Здоровец, М. В.; Власукова, Л. А.; Попов, А. И.; Dauletbekova, А.

doi:10.1002/pssa.202000231

Cited by 20 publications

(15 citation statements)

References 34 publications

(47 reference statements)

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“…10,11 It is important to mention that the electrochemical etching method is intensively used for nanostructure synthesis in the so-called ion-track template, which made it possible to create different nanocrystalline surface structures based on ZnO, ZnSeO 3 , CdTe, CdO and so on. [12][13][14] These methods have significant advantages over epitaxial and lithographic, in particular: no mechanical, thermal, and ionic effects on the sample surface, no tool wear, extremely wide control over the geometric shape (architecture) and size of micro-and nanostructures. 15,16 The undeniable advantages of the methods are simplicity, a small number of parts of the technological process, no need for complex equipment and low cost of technological operations.…”

Section: Introductionmentioning

confidence: 99%

Formation of oxide crystallites on the porous GaAs surface by electrochemical deposition

Suchikova

Ковачов

Bohdanov

2022

Nanomaterials and Nanotechnology

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We demonstrate how the formation of octahedral microcrystals of arsenic oxide As2O3 in the form of arsenolite with a size of 200 nm to 10 μm can be initiated by the electrochemical etching method with simultaneous deposition on the surface of substrates with n-GaAs (111). Crystallites were formed on a previously synthesized porous layer of GaAs. To explain the behavior of formation on the surface of the monocrystalline GaAs porous layer and As2O3 crystallites in the electrochemical reaction, we propose a qualitative model based on the decomposition of binary semiconductors in contact with electrolytes. Under this model, the crystallization of precipitated oxides occurs as a result of the transfer of ions to the crystal surface as a result of the electrolysis process. The formation of the composite structure takes place on the surface of the semiconductor and is characterized by the minimization of elastic energy. XRD analysis showed the formation of a complex compound of As2O3 and As0.172Sb0.570O1.113. The appearance of antimony is explained in terms of the formation of new centers when the As atom is replaced by an Sb doping atom in the crystal. Directed controlled oxidation technologies make it possible to synthesize a reliable passivating layer consisting of one type of oxide, namely As2O3 in the cubic phase of arsenolite. In addition, such structures can be used in photonics devices and as photocatalysts.

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Section: Introductionmentioning

confidence: 99%

Formation of oxide crystallites on the porous GaAs surface by electrochemical deposition

Suchikova

Ковачов

Bohdanov

2022

Nanomaterials and Nanotechnology

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“…One-dimensional nanostructures are frequently created by depositing materials into the enlongated pores of template membranes [1,4]. This strategy harnesses the synthetic flexibility offered by the diverse range of accessible architectures and available deposition techniques to produce nanorods, nanotubes (NTs), nanowires (NWs) or alterations of such structural motifs, composed of different material classes such as metals [2,[5][6][7][8], semiconductors [9], polymers [7,10], oxides [11,12], ionic compounds [13] or carbon [14]. Such materials have attracted attention in various applications, Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence.…”

Section: Introductionmentioning

confidence: 99%

Increasing the structural and compositional diversity of ion-track templated 1D nanostructures through multistep etching, plastic deformation, and deposition

et al. 2022

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Ion-track etching represents a highly versatile way of introducing artificial pores with diameters down into the nm-regime into polymers, which offers considerable synthetic flexibility in template-assisted nanofabrication schemes. While the mechanistic foundations of ion-track technology are well understood, its potential for creating structurally and compositionally complex nano-architectures is far from being fully tapped. In this study, we showcase different strategies to expand the synthetic repertoire of ion-track membrane templating by creating several new 1D nanostructures, namely metal nanotubes of elliptical cross-section, funnel-shaped nanotubes optionally overcoated with titania or nickel nanospike layers, and concentrical as well as stacked metal nanotube-nanowire heterostructures. These nano-architectures are obtained solely by applying different wet-chemical deposition methods (electroless plating, electrodeposition, and chemical bath deposition) to ion-track etched polycarbonate templates, whose pore geometry is modified through plastic deformation, consecutive etching steps under differing conditions, and etching steps intermitted by spatially confined deposition, providing new motifs for nanoscale replication.

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“…When the size is smaller or comparable with the exciton Bohr radius, CdTe NCs possess excellent optoelectronic characteristics due to the quantum confinement effect. From a technological perspective, many methods have been applied to synthesize CdTe NCs in thin film form, which includes vacuum evaporation, inkjet printing [ 9 ], chemical bath deposition [ 10 ], spin coating, electrodeposition, and ion-track templates [ 11 ]. However, among these methods, the spin coating technique is suitable for the preparation of polymer-capped II-VI group nanofilm, as it is cost-effective and easy to handle for large-area deposition [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

Temperature-Dependent Excitonic Photoluminescence and Nonlinear Absorption of CdTe Nanocrystal/Polyvinyl Alcohol Films

et al. 2021

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The temperature dependence of the excitonic photoluminescence (PL) and nonlinear absorption characteristics of CdTe nanocrystals (NCs)/polyvinyl alcohol (PVA) film are investigated using steady-state/time-resolved PL spectroscopy and Z-scan methods. The excitonic PL peaks of CdTe NCs can be observed at the wavelengths from 560 to 670 nm, with size changes from 2.1 to 3.9 nm. From the temperature-dependent PL spectra, the smaller photon energy of the PL emission peak, the rapidly decreasing PL intensity, and the wider linewidth are observed with increasing temperature from 80 to 300 K. It is revealed that the exciton PL is composed of both trapped state and band-edge excitonic state, which presents biexponential fitting dynamics. The short-lived species is due to the surface-trapped state recombination in NCs, which has a photogenerated trapped channel and a time-resolved peak shift. The species with a long-lived lifetime is ascribed to the intrinsic excitonic recombination. Through the femtosecond Z-scan method, the nonlinear absorption coefficient becomes smaller with the increase in the size of the NCs. The optical properties of the CdTe NC/PVA film show the potential of II-VI traditional NCs as display and luminescent materials that can utilize the combination of exciton PL and nonlinear absorption for expanded functionality.

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CdTe Nanocrystal Synthesis in SiO₂/Si Ion‐Track Template: The Study of Electronic and Structural Properties

Cited by 20 publications

References 34 publications

Formation of oxide crystallites on the porous GaAs surface by electrochemical deposition

Formation of oxide crystallites on the porous GaAs surface by electrochemical deposition

Increasing the structural and compositional diversity of ion-track templated 1D nanostructures through multistep etching, plastic deformation, and deposition

Temperature-Dependent Excitonic Photoluminescence and Nonlinear Absorption of CdTe Nanocrystal/Polyvinyl Alcohol Films

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CdTe Nanocrystal Synthesis in SiO2/Si Ion‐Track Template: The Study of Electronic and Structural Properties

Cited by 20 publications

References 34 publications

Formation of oxide crystallites on the porous GaAs surface by electrochemical deposition

Formation of oxide crystallites on the porous GaAs surface by electrochemical deposition

Increasing the structural and compositional diversity of ion-track templated 1D nanostructures through multistep etching, plastic deformation, and deposition

Temperature-Dependent Excitonic Photoluminescence and Nonlinear Absorption of CdTe Nanocrystal/Polyvinyl Alcohol Films

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CdTe Nanocrystal Synthesis in SiO₂/Si Ion‐Track Template: The Study of Electronic and Structural Properties