Browsing by Author "Shivani Verma"

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Advances in Semiconducting Fibers
(CRC Press, 2024) Sanjeev Verma; Tapas Das; Shivani Verma; Ram K. Gupta; Bhawna Verma
The development of semiconductor fiber technology in recent years has been accelerated by improvements in fabrication and post-processing methods. Numerous opportunities, including solar energy harvesting, photodetection, signal modulation, and in-fiber frequency generation, have been made possible by combining the electronic and optical functions of fiber-structured semiconductor materials. An outline of the most recent developments in semiconductor material fibers, such as manufacturing and after-processing techniques, optical characteristics and different materials, is provided in this chapter. Applications for lasers, multimaterial functional fibers, optical–electrical conversion and nonlinear optics are also presented. © 2025 selection and editorial matter, Ram K. Gupta; individual chapters, the contributors.
Graphene-based nanocomposites: An efficient detoxification agent for heavy metal removal from wastewater
(National Institute of Science Communication and Policy Research, 2023) Sanjeev Verma; Shivani Verma; Tapas Das; Bhawna Verma
Numerous scientific and technological developments in wastewater treatment procedures are brought on by the shortage of clean water supplies. Heavy metals' recalcitrance in wastewater has been shown to be a difficult issue. Further, drinking water quality must be at its highest for human health to be at its best; nevertheless, a number of human activities are continuously degrading it, which has an effect on human health either directly or indirectly. Because heavy metals are the primary causes of many chronic illnesses and have a tendency to bio accumulate, they are giving rise to a lot of worries. Technologies from all over the world are being developed to address the demand for clean drinking water. The objective of the current study is to raise awareness of the need to remove dangerous dense metals from various types of wastewater and the application of modified graphene nanocomposite for their adsorption-based removal. Graphene-based nanocomposite materials have been picked for this application due to their large surface area, superior mechanical strength, and reactivity towards polar and nonpolar contaminants for the electrostatic emission of the heavy metal ions arsenic (As), chromium (Cr), copper (Cu), and lead (Pb). © 2023, National Institute of Science Communication and Policy Research. All rights reserved.
Nanowires for Supercapacitors
(CRC Press, 2023) Sanjeev Verma; Shivani Verma; Saurabh Kumar; Bhawna Verma
Nanomaterials have various preferable properties for supercapacitor applications because of their nanosize, which is different from other sizes such as micron sizes and bulky behavior. Nanowires are one-dimensional (1D) materials, in which atoms grew in 1D only. 1D inherent morphologies of nanowires give a quick path for effective ion movement. Their high length/diameter ratio, large surface area, ease of electrode-electrolyte interaction, and easy adsorption of ions pay much attention to supercapacitor materials. In this chapter, we discuss the various synthesis approaches with current prospects of research in the field of nanowire-based supercapacitor electrode materials. It includes electric double layer capacitance (EDLC), pseudocapacitance, and hybrid-type nanowire materials in the supercapacitor field. And we also discuss symmetric and asymmetric nanowire systems. Furthermore, the advantages and disadvantages of nanowire-based materials in supercapacitors are also addressed. Finally, we examine the prime areas in research and development for commercializing nanowire-based supercapacitors. © 2023 selection and editorial matter, Ram K. Gupta.
Pseudocapacitive Materials-Based Metal-Air Batteries
(Springer Science and Business Media Deutschland GmbH, 2024) Sanjeev Verma; Vikas Kumar Pandey; Ram K. Gupta; Shivani Verma; Bhawna Verma
Researchers’ attraction has been sparked by the fabrication of green and renewable energy-storage innovations in view of the increasing hurdle around the needs of energy and environmental concerns. MABs (Metal-air batteries), mainly rechargeable MABs, are seen as a viable energy storage/conversion solution because of their high energy density and specific power, lower price, as well as its safety. Moreover, the fabrication of MABs is significantly hindered by their lower rate ability, corrosion, and dendrite formation between the electrochemical actions, less active material synthesis strategies expansion, slower oxygen reaction kinetics at cathode surface, electrolyte and electrode refinement, and a proper separator selection. This chapter goes into great detail to help readers understand many types of MABs, the fundamentals of electrode reactions and battery configurations, the function of electrode active materials, separators, and electrolytes, as well as future scenarios. © 2024, The Author(s), under exclusive license to Springer Nature Switzerland AG.