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Anand S, Pauline S. Effective lightweight, flexible and ultrathin PVDF/rGO/Ba 2Co 2Fe 12O 22composite films for electromagnetic interference shielding applications. NANOTECHNOLOGY 2021; 32:475707. [PMID: 33691294 DOI: 10.1088/1361-6528/abed75] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Accepted: 03/10/2021] [Indexed: 06/12/2023]
Abstract
In this study, we developed a simple and cost-effective solvent film casting method to fabricate ultrathin, flexible and lightweight polyvinylidenefluoride (PVDF)-based composites that provide high electromagnetic interference (EMI) shielding performance. Y-type barium hexaferrite with general formula Ba2Co2Fe12O22was first synthesized by the sol-gel autocombustion method and then reduced graphene oxide (rGO) was prepared by modified Hummer's method. The crystal structure, morphology, elemental surface analysis and magnetic properties of the samples were systematically investigated using x-ray diffraction spectroscopy, Fourier-transform infrared spectroscopy, Raman spectroscopy, high-resolution scanning electron microscopy, energy-dispersive x-ray spectroscopy, x-ray photoelectron spectroscopy and vibrating sample magnetometry. Then, the complex permittivity, complex permeability and EMI shielding properties of the flexible PVDF/rGO/Ba2Co2Fe12O22composite films with two different amounts of Ba2Co2Fe12O22NP content and a fixed amount of rGO content were investigated using a vector network analyzer. The structural characterizations of the resultant composite films showed the formation of an electroactiveβ-phase of PVDF with addition of Ba2Co2Fe12O22nanoparticles and rGO content. The enhancement of theβ-phase in the PVDF/rGO/Ba2Co2Fe12O22nanocomposites was explained from a physicochemical viewpoint. Furthermore, the electrically conductive and magnetic properties of PVDF composite films incorporating rGO and Ba2Co2Fe12O22NPs exhibited a high EMI shielding effectiveness of 25.63 dB, with an absorption-dominated shielding feature in the 8-12 GHz region. The enhanced absorption was attributed to the electrostatic interaction induced by theβ-phase fraction in the PVDF matrix, and subsequently from multiple reflections and magnetic loss originating from the synergetic effect of rGO and Ba2Co2Fe12O22NPs. This study introduces a low-cost and scalable method for the design of novel, lightweight, flexible and efficient EMI shielding composite films with promising prospects for application in the construction, electronics and aerospace fields.
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Affiliation(s)
- S Anand
- Department of Physics, Loyola College (Autonomous), University of Madras, Chennai-600034, India
| | - S Pauline
- Department of Physics, Loyola College (Autonomous), University of Madras, Chennai-600034, India
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Gupta GK, Sagar P, Pandey SK, Srivastava M, Singh AK, Singh J, Srivastava A, Srivastava SK, Srivastava A. In Situ Fabrication of Activated Carbon from a Bio-Waste Desmostachya bipinnata for the Improved Supercapacitor Performance. NANOSCALE RESEARCH LETTERS 2021; 16:85. [PMID: 33987738 PMCID: PMC8119520 DOI: 10.1186/s11671-021-03545-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2021] [Accepted: 05/05/2021] [Indexed: 06/01/2023]
Abstract
Herein, we demonstrate the fabrication of highly capacitive activated carbon (AC) using a bio-waste Kusha grass (Desmostachya bipinnata), by employing a chemical process followed by activation through KOH. The as-synthesized few-layered activated carbon has been confirmed through X-ray powder diffraction, transmission electron microscopy, and Raman spectroscopy techniques. The chemical environment of the as-prepared sample has been accessed through FTIR and UV-visible spectroscopy. The surface area and porosity of the as-synthesized material have been accessed through the Brunauer-Emmett-Teller method. All the electrochemical measurements have been performed through cyclic voltammetry and galvanometric charging/discharging (GCD) method, but primarily, we focus on GCD due to the accuracy of the technique. Moreover, the as-synthesized AC material shows a maximum specific capacitance as 218 F g-1 in the potential window ranging from - 0.35 to + 0.45 V. Also, the AC exhibits an excellent energy density of ~ 19.3 Wh kg-1 and power density of ~ 277.92 W kg-1, respectively, in the same operating potential window. It has also shown very good capacitance retention capability even after 5000th cycles. The fabricated supercapacitor shows a good energy density and power density, respectively, and good retention in capacitance at remarkably higher charging/discharging rates with excellent cycling stability. Henceforth, bio-waste Kusha grass-derived activated carbon (DP-AC) shows good promise and can be applied in supercapacitor applications due to its outstanding electrochemical properties. Herein, we envision that our results illustrate a simple and innovative approach to synthesize a bio-waste Kusha grass-derived activated carbon (DP-AC) as an emerging supercapacitor electrode material and widen its practical application in electrochemical energy storage fields.
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Affiliation(s)
- Gopal Krishna Gupta
- Department of Physics, TDPG College, VBS Purvanchal University, Jaunpur, 222001, India
| | - Pinky Sagar
- Department of Physics, Institute of Science, Banaras Hindu University, Varanasi, 221005, India
| | - Sumit Kumar Pandey
- Department of Physics, Institute of Science, Banaras Hindu University, Varanasi, 221005, India
| | - Monika Srivastava
- School of Materials Science and Technology, Indian Institute of Technology (BHU), Varanasi, 221005, India
| | - A K Singh
- School of Physical Sciences, Jawaharlal Nehru University, New Delhi, 110067, India
| | - Jai Singh
- Department of Pure and Applied Physics, Guru Ghasidas Vishwavidyalaya, Bilaspur, 495009, India
| | - Anchal Srivastava
- Department of Physics, Institute of Science, Banaras Hindu University, Varanasi, 221005, India
| | - S K Srivastava
- Department of Physics, Institute of Science, Banaras Hindu University, Varanasi, 221005, India.
| | - Amit Srivastava
- Department of Physics, TDPG College, VBS Purvanchal University, Jaunpur, 222001, India.
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Ghosh K, Srivastava SK. Enhanced Supercapacitor Performance and Electromagnetic Interference Shielding Effectiveness of CuS Quantum Dots Grown on Reduced Graphene Oxide Sheets. ACS OMEGA 2021; 6:4582-4596. [PMID: 33644566 PMCID: PMC7905797 DOI: 10.1021/acsomega.0c05034] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2020] [Accepted: 12/30/2020] [Indexed: 05/05/2023]
Abstract
This study is focused on the preparation of the CuS/RGO nanocomposite via the hydrothermal method using GO and Cu-DTO complex as precursors. X-ray diffraction, Fourier-transform infrared spectroscopy, and Raman and X-ray photoelectron spectroscopy study revealed the formation of the CuS/RGO nanocomposite with improved crystallinity, defective nanostructure, and the presence of the residual functional group in the RGO sheet. The morphological study displayed the transformation of CuS from nanowire to quantum dots with the incorporation of RGO. The galvanostatic charge/discharge curve showed that the CuS/RGO nanocomposite (12 wt % Cu-DTO complex) has tremendous and outperforming specific capacitance of 3058 F g-1 at 1 A g-1 current density with moderate cycling stability (∼60.3% after 1000 cycles at 10 A g-1). The as-prepared nanocomposite revealed excellent improvement in specific capacitance, cycling stability, Warburg impedance, and interfacial charge transfer resistance compared to neat CuS. The fabricated nanocomposites were also investigated for their bulk DC electrical conductivity and EMI shielding ability. It was observed that the CuS/RGO nanocomposite (9 wt % Cu-DTO) exhibited a total electromagnetic shielding efficiency of 64 dB at 2.3 GHz following absorption as a dominant shielding mechanism. Such a performance is ascribed to the presence of interconnected networks and synergistic effects.
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Affiliation(s)
- Kalyan Ghosh
- Department of Chemistry, Indian
Institute of Technology Kharagpur, Kharagpur 721302, India
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Ghosh K, Srivastava SK. Fabrication of N-Doped Reduced Graphite Oxide/MnCo 2O 4 Nanocomposites for Enhanced Microwave Absorption Performance. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:2213-2226. [PMID: 33541084 DOI: 10.1021/acs.langmuir.0c03641] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The present work reports on the fabrication of a lightweight microwave absorber comprising MnCo2O4 prepared from the urea complex of manganese (Mn)/cobalt (Co) and nitrogen-doped reduced graphite oxide (NRGO) by facile hydrothermal method followed by annealing process and characterized. The phase analysis, compositional, morphological, magnetic, and conductivity measurements indicated dispersion of paramagnetic MnCo2O4 spherical particles on the surface of NRGO. Our findings also showed that Mn, Co-urea complex, and GO in the weight ratio of 1:4 (NGMC3) exhibited maximum shielding efficiency in the range of 55-38 dB with absorption as an overall dominant shielding mechanism. The reflection loss of NGMC3 was found to be in the range of -90 to -77 dB with minima at -103 dB (at 2.9 GHz). Such outstanding electromagnetic wave absorption performance of NRGO/MnCo2O4 nanocomposite compared to several other metal cobaltates could be attributed to the formation of percolated network assisted electronic polarization, interfacial polarization and associated relaxation losses, conductance loss, dipole polarization and corresponding relaxation loss, impedance matching, and magnetic resonance to some extent.
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Affiliation(s)
- Kalyan Ghosh
- Department of Chemistry, Indian Institute of Technology, Kharagpur, West Bengal 721302, India
| | - Suneel Kumar Srivastava
- Department of Chemistry, Indian Institute of Technology, Kharagpur, West Bengal 721302, India
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Prasad J, Singh AK, Yadav AN, Kumar A, Tomar M, Srivastava A, Kumar P, Gupta V, Singh K. Molybdenum Disulfide-Wrapped Carbon Nanotube-Reduced Graphene Oxide (CNT/MoS 2-rGO) Nanohybrids for Excellent and Fast Removal of Electromagnetic Interference Pollution. ACS APPLIED MATERIALS & INTERFACES 2020; 12:40828-40837. [PMID: 32786247 DOI: 10.1021/acsami.0c06219] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Electromagnetic interference (EMI) pollution has now become a subject of great concern with the rapid development of delicate electronic equipment in commercial, civil, and military operations. There has been a surge in pursuit of light-weight, adaptable, effective, and efficient EMI screening materials in recent years. The present article addresses a simple and sensitive approach to synthesize a core/shell carbon nanotube/MoS2 heterostructure supported on reduced graphene oxide (CNT/MoS2-rGO nanohybrid) as an efficient electromagnetic shielding material. The structural and morphological characteristics were accessed through X-ray diffraction, transmission electron microscopy, scanning electron microscopy, and Raman spectroscopy, augmenting successful formation of the CNT/MoS2-rGO nanohybrid. The shielding performance of the as-synthesized samples has been accessed in a wide frequency range of 8-12 GHz. A CNT/MoS2-rGO nanohybrid demonstrates a better EMI shielding performance in comparison to MoS2 nanosheets and MoS2-rGO nanohybrid individually. The CNT/MoS2-rGO nanohybrid having a thickness ∼1 mm shows excellent total shielding effectiveness (SET) as high as 40 dB, whereas MoS2 and MoS2-rGO hybrid lags far, with the average value of SET as 7 and 28 dB, respectively. It also demonstrates that the nanohybrid CNT/MoS2-rGO shields the EM radiation by means of absorption through several functional defects and multiple interfaces present in the heterostructure. Herein, we envision that our results provide a simple and innovative approach to synthesize the light-weight CNT/MoS2-rGO nanohybrid having flexibility and high shielding efficiency and widen its practical applications in stealth technology.
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Affiliation(s)
- Jagdees Prasad
- School of Physical Sciences, Jawaharlal Nehru University, New Delhi 110067, India
| | - Ashwani Kumar Singh
- School of Physical Sciences, Jawaharlal Nehru University, New Delhi 110067, India
| | - Amar Nath Yadav
- School of Physical Sciences, Jawaharlal Nehru University, New Delhi 110067, India
| | - Ajit Kumar
- School of Physical Sciences, Jawaharlal Nehru University, New Delhi 110067, India
| | - Monika Tomar
- Department of Physics and Astrophysics, University of Delhi, New Delhi 110007, India
| | - Amit Srivastava
- Department of Physics, T.D.P.G. College, V.B.S. Purvanchal University, Uttar Pradesh 222002, India
| | - Pramod Kumar
- Sri Aurobindo College, University of Delhi, New Delhi 110017, India
| | - Vinay Gupta
- Department of Physics and Astrophysics, University of Delhi, New Delhi 110007, India
| | - Kedar Singh
- School of Physical Sciences, Jawaharlal Nehru University, New Delhi 110067, India
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Raagulan K, Kim BM, Chai KY. Recent Advancement of Electromagnetic Interference (EMI) Shielding of Two Dimensional (2D) MXene and Graphene Aerogel Composites. NANOMATERIALS (BASEL, SWITZERLAND) 2020; 10:E702. [PMID: 32276331 PMCID: PMC7221907 DOI: 10.3390/nano10040702] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 03/18/2020] [Accepted: 03/22/2020] [Indexed: 02/07/2023]
Abstract
The two Dimensional (2D) materials such as MXene and graphene, are most promising materials, as they have attractive properties and attract numerous application areas like sensors, supper capacitors, displays, wearable devices, batteries, and Electromagnetic Interference (EMI) shielding. The proliferation of wireless communication and smart electronic systems urge the world to develop light weight, flexible, cost effective EMI shielding materials. The MXene and graphene mixed with polymers, nanoparticles, carbon nanomaterial, nanowires, and ions are used to create materials with different structural features under different fabrication techniques. The aerogel based hybrid composites of MXene and graphene are critically reviewed and correlate with structure, role of size, thickness, effect of processing technique, and interfacial interaction in shielding efficiency. Further, freeze drying, pyrolysis and hydrothermal treatment is a powerful tool to create excellent EMI shielding aerogels. We present here a review of MXene and graphene with various polymers and nanomaterials and their EMI shielding performances. This will help to develop a more suitable composite for modern electronic systems.
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Affiliation(s)
- Kanthasamy Raagulan
- Division of Bio−Nanochemistry, College of Natural Sciences, Wonkwang University, Iksan 570-749, Korea;
| | - Bo Mi Kim
- Department of Chemical Engineering, Wonkwang University, Iksan 570-749, Korea
| | - Kyu Yun Chai
- Division of Bio−Nanochemistry, College of Natural Sciences, Wonkwang University, Iksan 570-749, Korea;
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