Influence of Equimolar Concentration on Structural and Optical Properties of Binary Selenides Nanoparticles

Muthukannan, Abirami; Sivakumar, G.; Mohanraj, K.

doi:10.1080/02726351.2014.880978

Cited by 16 publications

(5 citation statements)

References 13 publications

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“…Ιn all three cases, BM1, BM2 and BM3, the size of the crystallites of the crystal structures is within the range of 12.0-22.0 nm. The size of the crystallites is verified by previous studies indicating that with this synthesis technique, the crystal structures are in the nano-dimensions [20,21]. In Fig.…”

Section: Pos(bpu11)210supporting

confidence: 81%

Formation of Copper Selenide synthesized by Mechanical Alloying

Stathokostopoulos,

Pavlidis,

Karagiannis

et al. 2023

Proceedings of 11th International Conference of the Balkan Physical Union — PoS(BPU11)

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Copper selenides are attractive materials for high-temperature thermoelectric applications. They exhibit remarkably enhanced thermoelectric properties originating from their superionic liquid character. In this work, the synthesis of Cu-Se compounds is investigated using mechanical alloying, aiming to obtain the Cu 2 Se phase and modify the crystal structure by annealing at high temperatures and quenching. In the first part, Cu-Se powders are prepared at various milling times. They are characterized regarding their structure, morphology and composition by X-ray diffraction analysis and scanning electron microscopy. After 2.5 h of synthesis, α-Cu 2 Se and β-Cu 2 Se was attained in the powder, with the former having the highest percentage contribution. The crystallite size of these phases was calculated to be in the range of 17.0-19.6 nm. The synthesized powder consisted of grains with dimensions from nanometers to micrometers and their aggregates. A trace of a possibly surficial layer of copper oxide was also detected on the sample. In the second part of this study, the optimum synthesized powder was subjected to 2 h of annealing at 650 °C, followed by quenching. According to X-ray diffraction analysis, the percentage contribution of the thermoelectrically inferior α-Cu 2 Se phase increased being the vast majority of the material and almost eliminated β-Cu 2 Se. The crystallite size was calculated to be in the range of 31.2-34.5 nm. Overall, the desired Cu 2 Se compound can be obtained by the mechanical alloying technique as α-and β-phase, and the crystal structure can be modified by annealing under appropriate conditions.

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Section: Pos(bpu11)210supporting

confidence: 81%

Formation of Copper Selenide synthesized by Mechanical Alloying

Stathokostopoulos,

Pavlidis,

Karagiannis

et al. 2023

Proceedings of 11th International Conference of the Balkan Physical Union — PoS(BPU11)

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“…The absorption peaks at 1151 cm −1 and 1022 cm −1 indicated the characteristic of the C-O-C stretching vibrations [36,37]. The weak bands near 555 cm −1 corresponded to the Cu-Se bending vibration, as reported in the previous literature [39].…”

Section: Ftirsupporting

confidence: 81%

Sodium-Based Chitosan Polymer Embedded with Copper Selenide (CuSe) Flexible Film for High Electromagnetic Interference (EMI) Shielding Efficiency

et al. 2021

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Efficient shielding materials are extremely important to minimize the effect of electromagnetic interference. Currently, various composite materials are being investigated with different shielding efficiencies reported. In this paper, a flexible and free-standing sodium-based chitosan (CH/Na) polymer with copper selenide (CuSe) filler was prepared for electromagnetic shielding. The CH/Na/CuSe polymer matrix was prepared via the direct casting technique at different wt% of CuSe, varying from 2 to 20 wt%. The polymer matrix was then characterised by using Fourier transform infrared (FTIR) spectroscopy to confirm the interaction between the CH/Na and CuSe. The XRD results revealed that the CH/Na/CuSe polymer was successfully formed. Improvement in the electrical conductivity was confirmed by an impedance spectroscopy measurement. The highest electrical conduction recorded was at 3.69 × 10−5 S/cm for CH/Na/CuSe polymer matrix with 20 wt% CuSe. An increase in total electromagnetic interference (EMI) shielding efficiency (SET) of up to 20 dB (99% EM power shield) was achieved, and it can be increased up to 34 dB (99.9% EM power shield) with the thickness of the polymer increased.

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“…[11] Other less intensive peaks centered at 2𝜃 = 26.55 o and 2𝜃 = 52.18 o are assigned to cubic PbSe with cell parameters of a = b = c = 5.80 Å, space group Fm3m. [12] Standards of PbSe are a = b = c = 6.12 Å (JCPDS card no: 060354). The phase weight of lead selenide (Δ% = ∑ A PbSe ∕ ∑ A All peaks ; A is the area of the peak) in the films is 21%.…”

Section: Resultsmentioning

confidence: 99%

“…Experimentally observed peaks centered at

2\theta \ = \ {29.45}^o

2\theta \ = \ {42.25}^o

, and

2\theta \ = \ {60.97}^o

are related to reflections from planes of cubic FeSe oriented in the (001), (011), and (002) directions, respectively. The data are related to cubic iron selenide of lattice parameters a = b = c = 3.04 Å, space group

Pm3m.

[ 11 ] Other less intensive peaks centered at

2\theta \ = \ {26.55}^o

and

2\theta \ = \ {52.18}^o

are assigned to cubic PbSe with cell parameters of a = b = c = 5.80 Å, space group

Fm3m.

[ 12 ] Standards of PbSe are a = b = c = 6.12 Å (JCPDS card no: 060354). The phase weight of lead selenide (

{{\Delta}}\% \ = \sum {A}_{{\mathrm{PbSe}}}/\sum {A}_{{\mathrm{All\ peaks}}};A\

is the area of the peak) in the films is 21%.…”

Section: Resultsmentioning

confidence: 99%

Pb/FeSe Interfaces Designed for Optical Communication Technology

Alharbi,

Qasrawi,

Algarni

2023

Cryst. Res. Technol.

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Herein, thin films of FeSe are coated onto glass and semitransparent Pb substrate of thicknesses of 200 nm. The produced glass/FeSe (GFS) and Pb/FeSe (PFS) are structurally, compositionally, and optically characterized. It is observed that Pb substrates induced the crystallinity of cubic FeSe and cubic PbSe. On average, 21% of the phases in FeSe films are identified as PbSe. Due to the strong orbital overlapping between Pb and FeSe, Pb substrate increases the light absorption, the dielectric constant, the optical conductivity, and the terahertz cutoff frequency by ≈150 %, 180 %, 263 %, and 101 %, respectively. In addition the direct and indirect energy bandgaps shrink from 2.49 and 2.80 to 2.41 and 2.50 eV, respectively. Moreover, treating GFS and PFS as terahertz optical resonators have shown that Pb substrates enhanced the drift mobility and increased the plasmon frequency making it adequate for 6G technology applications. An important feature of the PFS optical resonator is the stability of the terahertz cutoff frequency at 16 THz in the visible range of light. This feature together with the enhanced optical absorption in the visible light region makes the PFS films attractive for visible light communication technology.

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Influence of Equimolar Concentration on Structural and Optical Properties of Binary Selenides Nanoparticles

Cited by 16 publications

References 13 publications

Formation of Copper Selenide synthesized by Mechanical Alloying

Formation of Copper Selenide synthesized by Mechanical Alloying

Sodium-Based Chitosan Polymer Embedded with Copper Selenide (CuSe) Flexible Film for High Electromagnetic Interference (EMI) Shielding Efficiency

Pb/FeSe Interfaces Designed for Optical Communication Technology

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