Delafossite type CuCo0.5Ti0.5O2 composite structure: A futuristic ceramics for supercapacitor and EMI shielding application

Bhattacharya, Dhrubajyoti; Ghoshal, Debopriyo; Mondal, Dheeraj; Paul, Biplab Kumar; Pal, Joydeep; Gupta, Bhaskar; Bose, Navonil; Nandy, Papiya; Basu, Mousumi; Das, Sukhen

doi:10.1016/j.ceramint.2020.12.135

Cited by 21 publications

(6 citation statements)

References 85 publications

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“…3, the CuAlO2 and Ag doped CuAlO2 samples' room temperature Raman scattering spectra exhibit many photonic bands of the delafossite structure. From Raman spectrum of Ag0 sample, Raman modes present around 209 cm -1 , 441 cm -1 , 535 cm -1 , and 693 cm -1 , in agreement with earlier results on CuAlO2 [21][22]. Observed modes identified as A1g at 693 cm -1 , Eg at 441 cm -1 , and Ag at 209 cm -1 , in addition to band at 535 cm -1 are the bands that make up this pattern.…”

Section: Vibrational Analysissupporting

confidence: 89%

Structure, Optical, and Dielectric Properties of Cu1-xAgxAlO2 Nanoparticles

Saleh¹,

Albarg²

2023

Preprint

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The solid-state technique was utilized to make a single phase of delafossite CuAlO2, along with 1%, 2%, 3% and 4% silver doped CuAlO2 samples in this study. The content of the samples was investigated using energy dispersive X-ray spectroscopy (EDS) equipped with a field emission scanning electron microscope (FE-SEM). The polycrystalline nature of all of the analyzed cases was confirmed by structural analyses utilizing an X-ray diffraction (XRD) pattern with a simple typical peak of CAO rhombohedral phase. Raman, FT-IR and UV–Vis spectroscopy were used to study the structural, and optical energy band gap (Eg) of Ag doped CuAlO2 nanoparticles. The Kubelka–Munk function was used to calculate the optical band gap of ACAO alloys using diffuse reflectance spectra, and it altered as the Ag ion concentration increased. A. c. impedance spectroscopy was used to investigate the dielectric characteristics of Ag doped CuAlO2 nanoparticles.

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Section: Vibrational Analysissupporting

confidence: 89%

Structure, Optical, and Dielectric Properties of Cu1-xAgxAlO2 Nanoparticles

Saleh¹,

Albarg²

2023

Preprint

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“…The unveiling of a ptype material with similar properties would open a new era in transparent electronics, by promoting the fabrication of fully transparent active devices such as p-n junctions [6,11], or complementary transistors [12][13][14]. This would open a new range of invisible electronics devices including smart windows [3,15,16], transparent UV LEDs [17,18], solar-cell heterojunctions [19,20], gas sensors [21][22][23][24], electromagnetic shielding [25], etc. Since the first report of a semitransparent p-type oxide, NiO [26], a large variety of materials has been investigated as a p-type TCOs suitable for applications:…”

Section: Graphical Abstract Introductionmentioning

confidence: 99%

A review on the p-type transparent Cu–Cr–O delafossite materials

et al. 2022

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Transparent conductive oxides (TCOs) constitute a class of materials that combine high electrical conductivity and optical transparency. These features led to the development of the transparent electronics applications, such as flat panel displays, “smart” windows or functional glasses. N-type TCOs dominate the applications market, and the lack of a suitable p-type counterpart limits the fabrication of a completely transparent active device, which might be considered as a technological breakthrough. Among the wide range of p-type candidates, delafossite CuCrO2 (and its out-of-stoichiometry derivatives) is a promising material to achieve the desired p-type TCO properties as, up to date, it is presenting the foremost trade-off between optical and electrical properties. The present paper covers the research work and the major achievements related to copper chromium delafossite. A comprehensive overview of fabrication methods and opto-electronic properties is presented. The source of doping and the charge carriers transport mechanism are also thoroughly discussed. Graphical abstract

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“…where, E and Eg are the photon energy and optical band gap energy in eV, respectively and α and A are the constant terms and the absorption coefficient, respectively. Figure 4(c) represents the plot of (αhυ) 2 versus hυ (photon energy). A tangent is taken from the linear portion of the curve and extended to intersect the energy axis, thus giving the direct band gap of the samples [22].…”

Section: Uv-visible Absorption Analysismentioning

confidence: 99%

“…The curve shows a few semicircular arcs. According to Debye's theory, these Kerr Circles should obey the equation [35,36],…”

Section: Microwave Absorption Studymentioning

confidence: 99%

Theoretical and Experimental Observations on Empowered EMI Shielding of Rare Earth Ion Infused α-MnO 2 Nano-rods

Mondal

Bhattacharya

Mondal

et al. 2023

Preprint

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In this communication, for the first time rare earth elements like Gd3+ and Er3+ ions are impregnated into the α-MnO2 tunneled structure involving the modified chemical synthesis route followed by hydrothermal technique. X-ray diffraction patterns and Raman spectroscopy confirm the proper phase formation without any impurity. A theoretical in-depth DFT study for the electronic bands and variation of density of states with the infusion of rare earth elements into the host structure confirms the experimental findings and depicts the suitability of the material towards the EMI shielding application. The novel synthesis technique helps to achieve uniform nanorod formation with a high specific surface area. Doping-induced defects, high surface-to-volume ratio, Maxwell-Wagner–Siller interfacial polarization, etc lead to achieving high dielectric response with moderate tangent loss at frequency range 40Hz to 1MHz. Temperature-dependent dielectric behavior indicates the paramagnetic to ferromagnetic transition at 120 \(℃\) and 70 \(℃\) for the Gd- and Er-doped α-MnO2 samples respectively. The electromagnetic interference (EMI) shielding effectiveness (SE) has achieved a maximum of − 43 dB at 15.3 GHz and − 46 dB at 15.3 GHz for Gd- and Er-doped α-MnO2 thin layer of thickness ∼600 µm respectively. Higher dipolar polarization, loss tangent, conductive pathways, and defects inside the crystal lead to attaining a high EMI shielding efficiency. This result reveals > 99.999% EMI SE against the hazardous electromagnetic waves in the microwave/GHz frequency region.

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Delafossite type CuCo0.5Ti0.5O2 composite structure: A futuristic ceramics for supercapacitor and EMI shielding application

Cited by 21 publications

References 85 publications

Structure, Optical, and Dielectric Properties of Cu1-xAgxAlO2 Nanoparticles

Structure, Optical, and Dielectric Properties of Cu1-xAgxAlO2 Nanoparticles

A review on the p-type transparent Cu–Cr–O delafossite materials

Theoretical and Experimental Observations on Empowered EMI Shielding of Rare Earth Ion Infused α-MnO 2 Nano-rods

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