Browsing by Author "Chhama Awasthi"

Now showing 1 - 4 of 4

L-tryptophan-assisted anthracene functionalization for copper-induced fluorescence Turn-off and controlled supramolecular nano-assembly
(Elsevier B.V., 2024) Tarkeshwar Maddeshiya; Surabhi Asthana; Kamalakanta Behera; Chhama Awasthi; Mrituanjay D. Pandey
A fluorescent chemosensor, l-Tryptophan-assisted Anthracene conjugate (1), has been designed and developed. 1 is highly selective and sensitive for detecting Cu(II) ions through a fluorescence "turn-off" mechanism, even in a competing environment with a high detection limit of 9.4 × 10−6 M. The smaller spherical nano-assembly transforms into larger spherical nano-assembly upon incubation with Cu(II) ions, highlighting the metal-induced morphological transformation of nano-assemblies. © 2024
Nanomaterial based on microorganisms for energy storage applications
(Elsevier, 2025) Ankur Srivastava; Amit Kumar Pathak; Chhama Awasthi; Jay Singh; Mrituanjay D. Pandey
Microorganisms based on nanomaterials have attracted considerable attention due to their vigorous properties of remarkable chemical stability, water-holding capacity, specific surface area, and good mechanical strength. The advantage of microorganism-based nanomaterials is that they provide environment-friendly synthetic procedures. These intriguing features make microorganisms suitable for fabricating versatile two and three-dimensional nanomaterials to develop flexible scaffold materials. This book chapter presents a systematic, comprehensive, and modern view of developing microorganism-based nanomaterials for energy storage. The book chapter contains a brief introduction to the source of microorganisms, microstructure, and nature of microorganisms, as well as the suitable reasons behind the appropriate candidate for the synthesis of nanomaterials like metal oxide and metal hydroxide nanocomposites, doped nanomaterials, porous nanomaterials, and carbon-based nanomaterials for energy storage applications. Moreover, we provided significant research for energy storage applications like lithium-ion batteries, sodium-ion batteries, and supercapacitors, and lithium-sulfur batteries. Finally, we have also given prospects, challenges, and opportunities in designing functional nanomaterials from microorganisms for energy systems. © 2026 Elsevier Inc. All rights reserved.
Pyrene Appendant Triazole-based Chemosensors for Sensing Applications
(Bentham Science Publishers, 2024) Tarkeshwar Maddeshiya; Manoj K. Jaiswal; Arpna Tamrakar; Gargi Mishra; Chhama Awasthi; Mrituanjay D. Pandey
Over the last two decades, the design and development of fluorescent chemosensors for the targeted detection of Heavy Transition-metal (HTM) ions, anions, and biological ana-lytes, have drawn much interest. Since the introduction of click chemistry in 2001, triazole moieties have become an increasingly prominent theme in chemosensors. Triazoles generated via click reactions are crucial for sensing various ions and biological analytes. Recently, the number of studies in the field of pyrene appendant triazole moieties has risen dramatically, with more sophisticated and reliable triazole-containing chemosensors for various analytes of interest de-scribed. This tutorial review provides a general overview of pyrene appendant-triazole-based chemosensors that can detect a variety of metal cations, anions, and neutral analytes by using modular click-derived triazoles. © 2024 Bentham Science Publishers.
Pyrene-Appended Luminescent Probes for Selective Detection of Toxic Heavy Metals and Live Cell Applications
(John Wiley and Sons Inc, 2024) Ankur Srivastava; Gargi Mishra; Amit Kumar Pathak; Saurabh Pandey; Chhama Awasthi; Mrituanjay D. Pandey; Kamalakanta Behera
Heavy metal contamination has become a global environmental problem and currently drawn much attention from researchers in worldwide. High exposure to heavy metals can lead to problems like kidney, liver and brain damage, skin and lung cancer, etc. Rapid and sensitive detection of heavy metals is of immense importance in environmental monitoring. Over the past few decades, enormous efforts have been made to design various sensors to identify and monitor these harmful metal ions. In Comparison with other methods, fluorescence-based chemosensors have received extensive attention because of the advantages of high sensitivity, low cost, real-time monitoring, simple operation, etc. The pyrene derivatives are significant polycyclic aromatic hydrocarbons (PAHs) with strong fluorescence. They are widely used as fluorescent probes in many applications due to their easy modification, high fluorescence quantum yield, and strong fluorescence emission in live cells, outstanding cell permeability, and very low cytotoxicity. The SDG 6: Clean water and sanitation alarm a strong strategy, and careful identification of the risk connected to environmental pollutants needs urgent attention in this situation. Therefore, we highlight different types of pyrene-based fluorophores and the fluorescence mechanisms for the sensitive and selective detection methodology of Arsenic, Mercury, Cadmium, Lead, and Chromium heavy metals. © 2024 Wiley-VCH GmbH.