Template-assisted synthesis of CdS nanocrystal arrays in chemically inhomogeneous pores using a vapor–solid mechanism

Grynko, D.; Fedoryak, Alexander; Dimitriev, Oleg P.; Lin, Andrew; Laghumavarapu, Ramesh B.; Huffaker, Diana L.; Kratzer, Markus; Piryatinskiĭ, Yu. P.

doi:10.1039/c5ra01175b

Cited by 3 publications

(3 citation statements)

References 46 publications

(32 reference statements)

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“…We are working on the usage of features of nanocrystals growth processes that allow formation of filamentary-like and more complex topologies of nanoobjects by using guided self-organization effects sometimes are easier than the traditional techniques of planar technology [4][5][6]. Earlier, we demonstrated several new techniques for CdS crystals growth [7][8][9] that allow controlling morphology, size, position on the substrate and the crystal structure of CdS nanosized crystals during chemical condensation from the gas phase in a quasi-closed volume. These techniques allow to grow CdS single crystals with a characteristic diameter of 20 up to 500 nm, length of 100 nm up to 1 mm, of both wurtzite and zinc-blende type of crystal symmetry.…”

Section: Introductionmentioning

confidence: 99%

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Piezo-mechanical impedance of nanosized CdS single crystal

Bogoslovskaya¹

2019

Semicond. phys. quantum electr. optoelectron

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The design of a piezo-mechanical device based on nanosized CdS single crystal is a challenging task for demonstration of both the technological capabilities of crystal growth control in order to form simple sensor device topologies and the integrated usage of unique material properties with bottom-up approach. Analysis of luminescence spectra of CdS nanocrystals grown from the gas phase at the temperature 400 °C in the quasi-closed volume revealed that doping takes place with tin, as a component of ITO conductive film, simultaneously with doping with gold or silver from catalyze droplets. Piezo-mechanical longitudinal vibrations along the main symmetry axis of wurtzite-type single crystal have been presented in the continuous medium approximation based on experimental values of the nanocrystal piezo-module. Theoretical analysis of the frequency dependence of resonance oscillations for the nanosized beam-type piezo-mechanical resonators based on the CdS nanocrystal enabled to ascertain the equivalent RLC two-pole and values of the equivalent elements L and C prognosticated: there are high values of L-tens and hundreds of henry and very small values of the series capacitance of the order of femto-and attofarads. Below the resonance, the impedance of the crystal reaches gigaohms and has an inductive character.

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Section: Introductionmentioning

confidence: 99%

“…In the case of heteroepitaxy, the crystallographic structure of semiconductor substrates governs the orientation of grown nanocrystal. As a result, CdS single crystal structure with firmly fixed crystal diameter and orientation has been grown on Si substrate [9].…”

Section: Introductionmentioning

confidence: 99%

Piezo-mechanical impedance of nanosized CdS single crystal

Bogoslovskaya¹

2019

Semicond. phys. quantum electr. optoelectron

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“…Specifically, a significant extension of surface area of a NW CdS array can be obtained by using the branched morphology. This approach has resulted in effective application of branched and hyper-branched semiconductor nanocrystals in energy conversion devices [ 11 ], sensors [ 12 ], electronic logic gates [ 13 ], etc. The advantage of the branched morphologies stems from an increased surface of such nanocrystals and therefore from higher contribution of processes at the interface of the nanocrystal and the environment.…”

Section: Introductionmentioning

confidence: 99%

Hybrid solar cell on a carbon fiber

et al. 2016

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In this work, a method to assemble nanoscale hybrid solar cells in the form of a brush of radially oriented CdS nanowire crystals around a single carbon fiber is demonstrated for the first time. A solar cell was assembled on a carbon fiber with a diameter of ~5–10 μm which served as a core electrode; inorganic CdS nanowire crystals and organic dye or polymer layers were successively deposited on the carbon fiber as active components resulting in a core-shell photovoltaic structure. Polymer, dye-sensitized, and inverted solar cells have been prepared and compared with their analogues made on the flat indium-tin oxide electrode.

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Influence of sulfurization on optical properties of CdS nanocrystals

Bogoslovska,

Grynko,

Bortchagovsky

2023

SPQEO

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Optical properties of 1D nanocrystals of cadmium sulfide synthesized by vapor– liquid–solid growing were investigated as the function from such technological parameter as overpressure of sulfur vapor at the synthesis process or post-processing by the additional annealing in the sulfur atmosphere (sulfurization). The analyses of UV-vis absorption and photoluminescence spectra indicate considerable dependences of CdS nanocrystals optical parameters from sulfur compensation degree at the synthesis process. The photo- luminescence spectra are characterized by changing the ratio of intensities of the defect level and near band edge emissions at overpressure sulfur vapor treatment. A significant decrease in the intensity of defect level emission after the growth or post-growth treatment in sulfur vapor has been observed. Optical absorption edge calculated using the Tauc relation demonstrates improvement of the crystal structure, which is reflected by the rising optical band gap value that approaches to the value for the bulk material at curing of sulfur vacancies by different technological ways. Optical properties obtained by absorption and luminescent measurements demonstrate total correlation, which corresponds to applied technology.

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Template-assisted synthesis of CdS nanocrystal arrays in chemically inhomogeneous pores using a vapor–solid mechanism

Abstract: Template of chemically inhomogeneous pores enables one to grow an ordered array of CdS multi-armed nanocrystals free of catalyst.

Cited by 3 publications

References 46 publications

Piezo-mechanical impedance of nanosized CdS single crystal

Piezo-mechanical impedance of nanosized CdS single crystal

Hybrid solar cell on a carbon fiber

Influence of sulfurization on optical properties of CdS nanocrystals

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