Polyamide–thallium selenide composite materials via temperature and pH controlled adsorption–diffusion method

Ivanauskas, Remigijus; Samardokas, Linas; Mikolajūnas, Marius; Viržonis, Darius; Baltrušaitis, Jonas

doi:10.1016/j.apsusc.2014.08.192

Cited by 11 publications

(6 citation statements)

References 49 publications

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“…Thallium selenide can then be formed during the reactions of these ions with Tl + cations [31] as described by the following reactions (1-3):…”

Section: Resultsmentioning

confidence: 99%

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Influence of chemical composition and doping on optical properties of thallium selenide layers prepared by adsorption/diffusion method

Samardokas¹,

Ivanauskas²,

Žalenkienė³

et al. 2021

chemija

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In this work, we investigated the formation of Tl-Se layers followed by doping with metal cations. A two-stage adsorption/diffusion process used to form Tl-Se layers involves (a) selenization in potassium selenotrithionate solution followed by (b) treatment with Tl+ precursor solutions. These layers have been successfully doped with Cu+/Cu2+, Ga3+ and Ag+ cations using a cation exchange reaction. The resulting chemical compositions of Tl-Se and Tl-M-Se (M = Cu, Ga, Ag) layers were investigated using the EDS and AAS methods. The bulk elemental composition and the Tl/Se molar ratio of the Tl-Se layers varied with the concentration of the Tl+ precursor solution, the exposure time in the Tl+ precursor solution, and the form of the Tl+ in the solution, whereas the EDS analysis showed that the surface was slightly enriched in thallium. The optical properties of the formed layers were studied. These layers were identified using room temperature reflection spectrum, the values of absorption edge, bandgap (Eg), band tail width (Urbach energy, EU) of the localised states, Steepness parameter (σ) and electron–phonon interaction (Ee-p).

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“…Thallium selenide can then be formed during the reactions of these ions with Tl + cations [31] as described by the following reactions (1-3):…”

Section: Resultsmentioning

confidence: 99%

“…) from aqueous solutions into the PA substrate [30]. After treating these anion-containing polyamide samples with aqueous solutions of metal cations different binary metal selenide layers on the polymer surface were obtained [31][32][33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Influence of chemical composition and doping on optical properties of thallium selenide layers prepared by adsorption/diffusion method

Samardokas¹,

Ivanauskas²,

Žalenkienė³

et al. 2021

chemija

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“…The results showed a mixture of several compounds, in which also some quantities of Tl 2 O 3 , S 8 , and Tl(OH) 3 were present. [105,108] In 2014, Ivanauskas et al prepared a composite material, depositing Tl x Se y on polyamide [239,247] and in 2015 thallium selenide layers on polycaproamide (PA 6). [248] These studies were performed using the adsorption-diffusion method for the preparation of layers.…”

Section: Thallium Chalcogenides Thin Films and Their Fabricationmentioning

confidence: 99%

A New, Thorough Look on Unusual and Neglected Group III‐VI Compounds Toward Novel Perusals

Guzzetta

Jellett

Azadmanjiri

et al. 2023

Small

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been permitted. [4][5][6][7] Although, the employment of 2D nanosheets, especially in biomedicine, is still in its primordial state and has permitted to the realization of novel advancements in such applications. [8][9][10] It needs to be highlighted that some of these compounds present mild cytotoxicity and dose-dependent induced metabolic disadvantages. [11,12] Albeit direct use in the body is not yet advisable, it is possible to indirectly employ these compounds in the creation of wearable devices for tracking vital parameters. [13] Research on such topics, both from fundamental and applied studies has led to an exponential increase in the number of publications during the last 10 years (Figure 1c). [14] One of the pivotal characteristics of 2D nanostructures is their high specific area-to-thickness ratio, which can be easily modulated through delamination processes. [15] Ultimately, the smallest crystals that can be created are mono-or bi-atomic layers. To understand how the nanocrystals form from bulk, it is important to comprehend the main characteristic features of the macrocrystals. A layered crystal lattice is presented in Figure 2. These crystals are governed by strong, covalent (or ionic) in-plane bonds, which are often arranged into hexagonal honeycombs. These individual sheets are linked together by inter-plane (inter-layer), and weak van der Waals (vdW) forces. The bond energies between the in-plane atoms, are the major contribution on the total energy of the lattice, leaving weak inter-plane interactions with relatively large distances (i.e., about few hundred picometers in graphene). These large inter-planar spaces are suitable attack points for size reduction, [16][17][18] which requires an external energy input from a providing source in order to delaminate single-layer crystals.The in-plane honeycomb structure is responsible for electrical transport and associated phenomena. For instance, the great mobility of p-electrons and their delocalization on the surface allows excellent transport in graphene. [23,24] However, in some other electro-and photoactivated semiconductors based on 2D materials, the electrical transport on the surface is responsible for the hole-electron confinement. [25] It can also produce poor electrical conduction by 2D materials such as hexagonal boron nitride (hBN) and so making them electrical insulators (see Figure 1a). [26] These differences in the layersThe attention on group III-VI compounds in the last decades has been centered on the optoelectronic properties of indium and gallium chalcogenides. These outstanding properties are leading to novel advancements in terms of fundamental and applied science. One of the advantages of these compounds is to present laminated structures, which can be exfoliated down to monolayers. Despite the large knowledge gathered toward indium and gallium chalcogenides, the family of the group III-VI compounds embraces several other noncommon compounds formed by the other group III elements. These compounds present various crystal lattices...

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“…Only chemical methods used in the formation process of cadmium chalcogenide thin layers allow the development of good quality thin layers through the application of low temperature conditions. The layers of chalcogenides of metals of I-II B groups on the substrate of an amphiphilic polyamide 6 (PA 6) were successfully obtained by the wet chemical method of adsorption-diffusion technology [17][18][19][20][21]. Very similar to this method the successive ionic layer adsorption and reaction (SILAR) one of the wet chemical methods is widely used to form these layers on a glass substrate [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Structural and Optical Characterizations of Cadmium Chalcogenide Layers on Polyamide Formed Using Monotelluropentathionic Acid

Ivanauskas¹,

Samardokas²,

Sukyte³

et al. 2022

Preprint

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Mixed cadmium tellurides – cadmium sulfides thin layers were formed on the polyamide PA 6. Monotelluropentathionic acid (H2TeS4O6) was used as precursor of tellurium and sulfur. We applied a low-temperature, nontoxic and cost-effective SILAR method. Cadmium telluride (CdTe) and sulfide (CdS) layers were formed through consecutive reactions of sorbed/diffused chalcogens species from telluropentathionate anion (TeS4O62–) with functional groups of polyamide and alkaline cadmium sulfate. The pseudo-second-order rate and Elovich kinetic models best fitted to quantify an uptake of chalcogens and cadmium on PA6. The effects of chalcogens and Cd on the structure and optical properties of PA6 were characterized using UV/Vis and IR spectra. The clear changes of these properties found in dependence on the concentration and exposure time in precursor's solutions. Fourier transform infrared spectroscopy and an ultraviolet-visible spectroscopy were applied in order to evaluate the effect of the chalcogens having particles on the changes in structure of polyamide 6 films depending on the exposure time in the solution of the chalcogens precursor and its concentration. The optical band gap energy of formed layers was found to be in the order of 1.52–2.36 eV. Studies of scanning electron microscopy and atomic force microscopy reveal that the diameter of the average grain is about 30 nm. The grains are conical in shape and unevenly distributed all over the surface of the substrate.

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Polyamide–thallium selenide composite materials via temperature and pH controlled adsorption–diffusion method

Cited by 11 publications

References 49 publications

Influence of chemical composition and doping on optical properties of thallium selenide layers prepared by adsorption/diffusion method

Influence of chemical composition and doping on optical properties of thallium selenide layers prepared by adsorption/diffusion method

A New, Thorough Look on Unusual and Neglected Group III‐VI Compounds Toward Novel Perusals

Structural and Optical Characterizations of Cadmium Chalcogenide Layers on Polyamide Formed Using Monotelluropentathionic Acid

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