Synthesis and surface properties of polyamide-Cu Se composite thin films

Ivanauskas, Remigijus; Baltrušaitis, Jonas

doi:10.1016/j.apsusc.2013.06.116

Cited by 27 publications

(14 citation statements)

References 40 publications

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“…However, this ratio is 0.87 in the copper selenide phase of hexagonal klockmannite Cu 0.87 Se. This ratio difference can be explained by the previous report [ 31 ], demonstrating that elemental selenium is formed as a consequence reaction of the decomposition product of SeS 2 O 6 2− ion according to reactions (4) and (5): Se 2 S 2 O 6 2− + Cu 2+ + 2H 2 O → CuSe + Se + 2H 2 SO 4 SeSO 3 2− + 2H + → Se + H 2 O + SO 2 …”

Section: Resultsmentioning

confidence: 76%

“…However, this ratio is 0.87 in the copper selenide phase of hexagonal klockmannite Cu 0.87 Se. This ratio difference can be explained by the previous report [31], demonstrating that elemental selenium is formed as a consequence reaction of the decomposition product of SeS 2 O 6 2− ion according to reactions (4) and ( 5 The copper selenide formed and elemental amorphous selenium remain adsorbed within the wool fiber, whereas other ions dissolve back into the solution. However, amorphous selenium cannot be detected by X-ray analysis.…”

Section: Bulk Chemical Composition and Xrd Characterization Of Cuxsementioning

confidence: 75%

“…A two-step adsorption/diffusion method for the deposition of a copper selenide coating on the surface of wool microfibers was proposed. The optimal conditions for each step were fine-tuned in research studies [ 31 , 37 ]. In the first step, divalent selenium anions adsorb and diffuse into the subsurface of wool fibers.…”

Section: Resultsmentioning

confidence: 99%

“…Wool is similar to polyamide in composition as they both have amide groups and chains. Previous work has shown [ 31 ] that electrically conductive copper selenide layers were formed on this polymer by adsorption/diffusion methods using potassium selenotrithionate salt as a selenium precursor. The main aim of this study is to investigate the possibilities of altering the conductive properties of wool fibers by applying copper selenide.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of the Possibilities of Wool Fiber Surface Modification with Copper Selenide

2021

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A study of altering the conductive properties of wool fibers by applying copper selenide is presented. The researched modification of wool fibers was based on a two-stage adsorption-diffusion process. X-ray diffraction, scanning electron microscope, energy-dispersive X-ray spectrum, and Fourier transform infrared spectroscopy were performed to evaluate the morphological and physical characteristics of all CuxSe-coated wool fibers. X-ray diffraction (XRD) data showed a single, Cu0.87Se (klockmannite), crystalline phase present, while Atomic Absorption Spectroscopy (AAS) and Energy Dispersive X-ray (EDX) analyses showed that the concentrations of Cu and Se in copper selenide coatings depend on the number of wool fiber treatment cycles. It was determined that a dense layer of CuxSe grows through a nucleation mechanism followed by particle growth to fill out the complete surface. It was found that the conductivity of the coated wool fibers depends on the quality and density of the copper selenide coating, thus the resistance of electrically impermeable wool fibers can be reduced to 100 Ω by increasing the number of treatment cycles.

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Section: Resultsmentioning

confidence: 76%

“…However, this ratio is 0.87 in the copper selenide phase of hexagonal klockmannite Cu 0.87 Se. This ratio difference can be explained by the previous report [31], demonstrating that elemental selenium is formed as a consequence reaction of the decomposition product of SeS 2 O 6 2− ion according to reactions (4) and ( 5 The copper selenide formed and elemental amorphous selenium remain adsorbed within the wool fiber, whereas other ions dissolve back into the solution. However, amorphous selenium cannot be detected by X-ray analysis.…”

Section: Bulk Chemical Composition and Xrd Characterization Of Cuxsementioning

confidence: 75%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigation of the Possibilities of Wool Fiber Surface Modification with Copper Selenide

2021

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“…) 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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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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Pulsed Hybrid Reactive Magnetron Sputtering for High zT Cu₂Se Thermoelectric Films

Taborda

Vera

Caballero‐Calero

et al. 2017

Adv Materials Technologies

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to its figure of merit, zT, defined as zT = (S 2 •σ)•κ −1 •T, an ideal thermoelectric material must exhibit high electrical conductivity (σ), high Seebeck coefficient (S), and low thermal conductivity (κ), simultaneously, to maximize its efficiency for the desired temperature range. In this context, there has been a significant increase of reports in the literature on Cu 2−x Se as a p-type material with high power factor (PF) [3] (being the PF = S 2 • σ). [1,3,4] Therefore, copper selenides have become a hot topic in the TE field, with reported figures of merit as high as zT ≈ 1.6 @ 727 °C. [5] Moreover, Cu 2−x Se has a crystallographic phase transition at T ≈ 130 °C, and it has been shown that around this transition temperature zT can reach values as high as 2.3. [6] Thermoelectric thin films occupy an industrial niche for microfabricated multielement planar devices on flexible substrates as low-current voltage generators for room temperature (RT) applications. In this range of temperatures, the highest zT reported value for bulk crystalline material is 0.28 (Liu et al. [5]). Cu 2−x Se films are typically p-type, highly conducting, semitransparent, and with a bandgap varying between 1.1 and 1.4 eV. Numerous methods have been reported for the deposition of Cu 2−x Se films at low substrate temperatures, such as a chemical bath deposition, [7-9] galvanic synthesis, [10] solution growth, [11] hydrothermal method, [12] or electrochemical deposition. [10,13] Other methods, such as adsorption/diffusion (selenization), [14-16] SILAR method, [17] and pulsed laser deposition [18,19] require high-temperature post growth treatments to improve and stabilize the thermoelectric properties. In any case, those different manufacturing film methods have not been able to surpass the thermoelectric efficiencies at room temperature of the Cu 2−x Se bulk samples prepared by solid-state reaction. [20,21] In the case of bulk samples other methods, such as spark plasma sintering, [4,5,22-28] ball milling followed by hot pressing, [24,29] and quenched bulk [30] have also been reported. In all these cases, high temperatures and long manufacturing times (even weeks) are necessary. In this work, we have developed a fabrication approach namely pulsed hybrid reactive magnetron sputtering (PHRMS) based on reactive sputtering, a vacuum technique that is widely used in industry as particularly suitable for thin film devices

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Synthesis and surface properties of polyamide-Cu Se composite thin films

Cited by 27 publications

References 40 publications

Investigation of the Possibilities of Wool Fiber Surface Modification with Copper Selenide

Investigation of the Possibilities of Wool Fiber Surface Modification with Copper Selenide

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

Pulsed Hybrid Reactive Magnetron Sputtering for High zT Cu₂Se Thermoelectric Films

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Synthesis and surface properties of polyamide-Cu Se composite thin films

Cited by 27 publications

References 40 publications

Investigation of the Possibilities of Wool Fiber Surface Modification with Copper Selenide

Investigation of the Possibilities of Wool Fiber Surface Modification with Copper Selenide

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

Pulsed Hybrid Reactive Magnetron Sputtering for High zT Cu2Se Thermoelectric Films

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Pulsed Hybrid Reactive Magnetron Sputtering for High zT Cu₂Se Thermoelectric Films