Browsing by Author "Akhilesh Kumar Yadav"

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Correction to: Electrochemical and physiochemical studies on the effects of thiadiazole derivatives in corrosion inhibition of Muntz metal in sulfide-polluted marine environment (Journal of Applied Electrochemistry, (2024), 54, 5, (1203-1221), 10.1007/s10800-023-02009-4)
(Springer Science and Business Media B.V., 2024) Parkavi Ravisankar; Jayavel Murugasamy; Sivasankaran Ayyaru; Srinivasan Kanagaraj; Jagadeesh Kumar Alagarasan; Imran Hasan; Prathap Somu; Akhilesh Kumar Yadav; Young-Ho Ahn
In the original publication of the article, the author's information in the supplementary information file was published incorrectly. The updated supplementary information file with the correct author's information and the affiliation details are provided in this correction. The original article has been corrected. © The Author(s), under exclusive licence to Springer Nature B.V. 2024.
Effect of Seasonal and Meteorological Variability of Air Pollution in Singrauli Coalfield
(Springer, 2022) Akhilesh Kumar Yadav; Saba Shirin; Christina Emmanouil; Aarif Jamal
Singrauli coalfield is an intensely industrialized area in India, where coal mining takes place. The air quality parameters of particulate matter (PM) ≤ 2.5 µm, ≤ 10 µm, total suspended particles (TSP) (≤ 100 µm), NO2 and SO2 at mining and residential sites in this area have been monitored for 2 consecutive years (2016 and 2017). Concentration of particulate matter of both sizes (≤ 2.5 µm, ≤ 10 µm) was high at all sites and this is due to sources such as mining activities, incineration, and traffic. For all monitored air pollutants higher values were recorded in winter season than in summer and the rainy season. It is possible that meteorological factors such as wind speed and rainfall reduced ambient air pollution. Vertical variation of pollutants was recorded in the Dudhichua industrial–residential area. Higher ground level values for PM10, TSP and NO2 were recorded as it has also been noted in other high traffic areas. In general, the observed air quality parameters concentrations were slightly above the National Ambient Air Quality Standards of India. These results highlight the degraded air status in areas hosting both active coalfields and coal-burning facilities and as such the need for pollution abatement measures. © 2022, The Author(s) under exclusive licence to Institute of Earth Environment, Chinese Academy Sciences.
Electrochemical and physiochemical studies on the effects of thiadiazole derivatives in corrosion inhibition of Muntz metal in sulfide-polluted marine environment
(Springer Science and Business Media B.V., 2024) Parkavi Ravisankar; Jayavel Murugasamy; Sivasankaran Ayyaru; Srinivasan Kanagaraj; Jagadeesh Kumar Alagarasan; Imran Hasan; Prathap Somu; Akhilesh Kumar Yadav; Young-Ho Ahn
The influence of certain thiadiazole derivatives on the corrosion of Muntz metal (60Cu–40Zn) in sulfide-polluted artificial seawater was analyzed using electrochemical and physiochemical studies methods. The surface morphology was examined by SEM to determine this inhibition mechanism. Elemental composition of the corroded alloy specimens was investigated in the presence and absence of thiadiazole derivatives using energy-dispersive X-ray analysis (EDX). Thiadiazole derivatives were found to successfully suppress Muntz metal corrosion. Adopting the weight loss method, the optimum concentration of inhibiting thiadiazole derivatives was 2.32 mM owing to the thiadiazole surface coverage and adsorption with increasing concentration. Among the derivatives investigated, N-(5-(4-aminophenyl)-1,3,4-thiadiazole-2-yl)-2-diphenylamino) acetamide (ATPA) showed the highest corrosion protection efficiency. EIS studies showed that charge transfer resistance occurs because of the presence of an inhibitor. Moreover, increasing thiadiazole concentration decreased the double-layer capacitance (Cdl) value because less charged species were attracted to the metal surface. Potentiostatic current–time transient techniques showed that ATPA hindered the corrosion rate owing to the substituted thiadiazoles. Polarization measurements clearly showed that the inhibitors suppressed both anodic and cathodic reactions. Consequently, accelerated leaching studies showed concentrations of Zn and Cu released from the alloy reducing as concentrations of inhibitors increased, in addition to the corrosion protection efficiency (%) increasing. The highest value was obtained at 2.32 mM of inhibitor. In conclusion, this study demonstrates that these compounds inhibit corrosion via chemisorption of organic compounds. Among these compounds, ATPA was found to offer better corrosion inhibition than others. Graphical abstract: (Figure presented.). © The Author(s), under exclusive licence to Springer Nature B.V. 2023. corrected publication 2024.
Enhancement of Photosensitivity in a Low-Operating-Voltage Organic-Inorganic Bilayer Thin-Film Transistor by Using an Asymmetric Source-Drain Electrode
(American Chemical Society, 2024) Pijush Kanti Aich; Zewdneh Genene; Utkarsh Pandey; Akhilesh Kumar Yadav; Ergang Wang; Bhola Nath Pal
A solution-processed inorganic-organic bilayer semiconductor channel-based red-light-sensitive thin-film transistor (TFT) has been fabricated by using an ion-conducting Li-Al2O3 gate dielectric that limits the operating voltage of this TFT within 2 V. In this device, a high-electron-mobility inorganic metal-oxide semiconductor (SnO2) was used as the primary charge transport layer, whereas the polymer (PIDT-2TPD) was used as the photoactive layer. To improve its red photosensitivity, an asymmetric work function source-drain (S-D) electrode was fabricated, which allows a selective carrier (electron or hole) injection and collection from the channel. Besides, the work function difference of this asymmetric S-D electrode generates a potential difference between electrodes that allows faster charge collection from the channel. As a consequence, the photosensitivity of this asymmetric S-D electrode TFT enhanced by ∼103 times under red illumination with respect to the symmetric S-D electrode TFT and the detectivity of this device increased ∼20 times. In addition, the on/off ratio of asymmetric TFT is 4 times greater than that of the symmetric TFT, whereas the subthreshold swing (SS) of this TFT is reduced from 200 to 144 mV/decade. © 2024 American Chemical Society.
Fabrication and electrochemical performance of pseudocapacitive ABO2-type AgFeO2@C
(Elsevier Ltd, 2023) Abhay Narayan Singh; Akhilesh Kumar Yadav; Asha Gupta; Chandana Rath; Preetam Singh
To make effective utilization of renewable energy sources, a highly efficient large-scale energy storage solution is needed that can fill the gap between the batteries (high energy density) and the capacitors (high power density). Supercapacitors are being a bridge between batteries and capacitors, suffer from low energy density, and need to be further upgradation for utilization as a grid-level energy storage solution. A higher energy density can be achieved by constructing an asymmetric cell (ASC) in which both, the electrodes (positive and negative) are worked in a separate potential window. Pseudocapacitive ABO2-type electrode in the form of an asymmetric cell (ASC), AgFeO2@C//K0.4MnO2. xH2O is envisaged here as high high-performing battery-type supercapacitor cell to develop large-scale energy storage solutions. Herein, crystallites of K0.4MnO2. xH2O were successfully grown via a facile chemical flux method that gives a birnessite-type layered structure having a lateral dimension in the range of 2–5 μm. Thus, the incorporation of birnessite- K0.4MnO2. xH2O as a positive electrode (cathode), and the thin carbon layer coated AgFeO2 as a negative electrode (anode) in aqueous 1 M Na2SO4 electrolyte in the form of ASC exhibited high energy density as well as power density with excellent cycle life up to cell voltages close to 1.8 V. The presented battery-type supercapacitor cell can deliver a maximum energy density equivalent to 61.51 Wh kg−1 and a power density of 450 W kg−1 at a current density of 0.5 A g−1, which is substantially larger than the previously reported aqueous electrolyte-based asymmetric supercapacitor devices. The newly developed high-voltage aqueous asymmetric battery-type supercapacitors device has a low-cost and enviro-friendly, that can replace currently market-available hazardous lead-acid batteries for fast energy storage applications. © 2023
Fabrication of a solution-processed low voltage TFT by using colloid 2D ZnO nanosheets and its application as a UV photodetector
(Royal Society of Chemistry, 2025) Abhik Bhuin; Akhilesh Kumar Yadav; Utkarsh S. Pandey; Debdyuti Mukherjee; Vivek Kumar Agrahari; Caroline Ponraj; Subha Sadhu; Bhola Nath Pal; Sujoy Sarkar
ZnO nanostructures have been extensively employed in optoelectronic devices because of their unique optoelectronic properties; however, these devices have been developed using physical vapor deposition techniques, which are costly and need a state-of-the-art fabrication facility. Hence, a solution-processed, cost-effective, low-temperature method is required for the large-scale fabrication of 2D material-based electronic devices. In this contribution, we report template, polymer, and surfactant-free wet chemical synthesis of 2D ZnO nanostructures having dimensions of ∼200 nm and thickness of ∼30 nm following the hydrothermal method. Detailed structural, morphological, and optical investigation revealed the formation of a pure hexagonal wurtzite phase of ZnO nanosheets. Utilizing the as-synthesized nanosheets, solution-processed thin film transistors (TFTs) are fabricated under low annealing temperatures that exhibit a high carrier mobility of 8.05 cm2 V−1 s−1 and an on-off ratio of ∼105. Also, these TFTs show high photosensitivity and can be used as UV detectors. Thus, our study highlights low-temperature facile fabrication of 2D ZnO TFTs, which may have promising applications in electronic displays, logic circuits, UV detectors, biosensors, and portable electronics. © 2025 The Royal Society of Chemistry.
Fabrication of Schottky Barrier Oxide Transistors to Reduce Subthreshold Swing Close to the Theoretical Limits
(John Wiley and Sons Inc, 2025) Utkarsh S. Pandey; Akhilesh Kumar Yadav; Pijush Kanti Aich; Rajarshi Chakraborty; Sandeep Dahiya; Bhola Nath Pal
The nature of the contact between the semiconductor channel and metal electrodes have a great influence on the functionality of a thin film transistor (TFT). A Schottky barrier of such contact can originate a ‘thermionic emission and thermionic field emission’ limited current transport that can reduce the sub-threshold swing of a TFT largely. This attribution has been dealt with using an asymmetric work-function source-drain (S-D) electrode of a low operating voltage TFT. Furthermore, the performance of the device can be optimized by incorporating a suitable interface layer with an optimal thickness in the asymmetric work-function S-D electrode configuration. In this study, a ZnO TFT has been fabricated by using a LiInSnO4 gate dielectric that reduces its operating voltage to 2 V due to the high areal capacitance of the ionic gate dielectric. In this TFT, LiF/Al serves as the source electrode, while MoO3/Ag works as the drain electrode with variable thickness of the MoO3 layer. Notably, by adjusting the thickness of the MoO3 layer within the MoO3/Ag electrode, the subthreshold swing of the TFT achieved 66 mV/decade, which is close to the theoretical limit of subthreshold swing for oxide TFTs. © 2025 Wiley-VCH GmbH.
Generation, Collection, and Recycling Policies of E-waste Across the Asian Region
(wiley, 2024) Rajwinder Singh; Arti Thanki; Akhilesh Kumar Yadav; Anmol Kaur; Karanvir Singh Sohal
[No abstract available]
Influence of the water–sediment interaction on the major ions chemistry and fluoride pollution in groundwater of the Older Alluvial Plains of Delhi, India
(Springer, 2021) Shakir Ali; Shashank Shekhar; Trupti Chandrasekhar; Akhilesh Kumar Yadav; Naresh Kumar Arora; Chandrashekhar Azad Kashyap; Prosun Bhattacharya; S.P. Rai; Prabhas Pande; Dornadulla Chandrasekharam
Fluoride (F–) pollution in groundwater of the Older Alluvial Plain (OAP) of Delhi has been reported as a major problem. About 34% of the groundwater samples collected for this study had F– level beyond the permissible limit; with F– concentration in the range of 0.14–3.15 mg/L (average 1.20 mg/L). In this context, this article for the first time attempts on the genesis of major ions chemistry and F– pollution in groundwater of OAP Delhi by going beyond the statistical analysis to sediment geochemistry, chemical weathering processes and understanding of the processes using stable environmental isotopes (2H and 18O). The XRD of the OAP sediments revealed the dominance of fluor-biotite, albite, calcite, quartz, and chlorite. Whereas, the separated clay revealed the dominance of chlorite, kaolinite, and illite minerals. The saturation index (SI) values indicated that the groundwater chemistry is in the process of further F– enrichment by way of sediment groundwater interaction. With the given mineralogy of the sediments, the dominance of major ions like Na+, K+, Mg2+, Ca2+, Cl– and F– has been attributed to chemical weathering of biotites, phlogopites, albite, and calcite during sediment–water interaction. While the dominance of SO42– has been attributed to anthropogenic sources and confirmed by its association with heavier stable isotopes of hydrogen (δ2H: −50.44 to −40.02‰) and oxygen (δ18O: −7.19 to −5.62‰) indicating evaporative enrichment during isotopic fractionation. © 2021, Indian Academy of Sciences.
Lithography-free, fully-printed lithium phosphate-based humidity sensors on paper as zero-waste, sustainable electronic solution
(Institute of Electrical and Electronics Engineers Inc., 2025) Sushree Sangita Priyadarsini; Disha Bhattacharjee; Aditi Ghosh; Akhilesh Kumar Yadav; Bhola Nath Pal; Subho Dasgupta
Electronic waste management is becoming an increasing concern for the planet, especially because it is increasing at a staggering rate of twenty percent per year. Therefore, various green, reusable, sustainable, and decomposable electronic technologies are being sought after in recent times. Among these, biodegradable paper electronics have emerged as one of the most preferred and affordable solutions. Here, in this study, we demonstrate a flexible and biodegradable humidity sensor based on lithium phosphate with titanium carbide on a photo paper substrate using lithography-free, all-printing technology that combines screen printing and inkjet printing. The local acidic environment created by the addition of acetic acid to the inkjet-printable lithium phosphate ink helps in absorbing and desorbing humidity on the surface of the printed lithium phosphate film. The paper-based humidity sensor leverages excellent sensing performance for a wide range of relative humidity values, with a substantially low response time and recovery time when the relative humidity changes by an approximate amount of fifteen percent. This study paves the way for a new generation of environment-friendly, sustainable, flexible, inexpensive sensors to provide sustainable sensing solutions in various applications, such as agriculture, environment monitoring, healthcare, weather prediction, etc. © 2025 IEEE.
Mechanism and Molecular Marker of Sex Identification in Dioecious Crops: Progress and Perspective
(American Chemical Society, 2025) Waqar Akhter Ansari; Ram Krishna; Mohd Aamir; Sajad Ali; Durgesh Kumar Jaiswal; Akhilesh Kumar Yadav; Mohammad Tarique Zeyad
Dioecious plant species have great agricultural, industrial, and ecological value, though their sexual diamorphism is reflected only at the reproductive stage, making early sex identification a tough job. At early stage (seedling) sex identification in dioecious plants is very important for the breeder, farmer, and economic agricultural productivity. The present review presents a comprehensive methodology of sex determination mechanisms in dioecious plants consisting of cytological, biochemical, morphological, and molecular traits which is an unquestionable requirement required for sexual distinction in dioecious plant species. A special emphasis is focused on molecular marker approaches like Inter-Simple Sequence Repeat (ISSR), Random Amplified Polymorphic DNA (RAPD), Amplified Fragment Length Polymorphism (AFLP), and Sequence Characterized Amplified Region (SCAR) molecular markers, which have potentially enhanced sex determination accuracy and efficiency. These markers have been utilized successfully in a range of dioecious crops such as Pandanus spp., Carica papaya, Cannabis sativa, and Asparagus officinalis. The review also points out the RAPD and ISSR conversion into SCAR for enhancing reproducibility and specificity, along with modern transcriptomic techniques for identifying floral sex-specific genes in economically important plants. Collectively, this review highlights the growing application of molecular marker-based approaches in early and reliable plant sex determination and suggests a future roadmap for high-throughput and genome-assisted strategies in breeding programs. © 2025 American Chemical Society
Nanobiomaterials-Based Environmental Bioremediation: A Special Focus on Microplastics
(American Chemical Society, 2024) Rajkumar Sekar; Sohel Das; Saba Shirin; Ramachandran Srinivasan; Pandi Marimuthu; Purushothaman Atchuthan; Sivakumar Lokesh Amith; Prathap Somu; Akhilesh Kumar Yadav
Environmental pollution by microplastics (MPTs) generated by physical destruction of plastics is a global problem with enduring and biohazardous threats. In recent decades, the expulsion of MPTs from the environment has affected human health and the green atmosphere. Currently, several significant high-tech innovations have been designed and reported to clean dangerous MPTs. Among them, nanotechnology-based biomaterials have received potential attention for bioremediation. This chapter focuses on collective microbial power technologies (MPTs) present in the natural green environment and explores techniques utilizing bionanomaterials for their effective cleaning. It is also providing information on bioremediation and designing modern green-environment approaches to control and purge MPTs in a short time. Moreover, we describe the different techniques with their advantages and disadvantages, which are also discussed. Finally, we conclude with the future outlook for delivering the path to a complete purge of MPTs. © 2024 American Chemical Society.
Silicon alleviates cadmium toxicity in muskmelon (Cucumis melo): integrative insights from photosynthesis to antioxidant activity to gene expression
(Royal Society of Chemistry, 2025) Ram Krishna; Mohammad Shahid; Waqar Akhter Ansari; Khalid Mashay Al-Anazi; Mohammad Abul Farah; Durgesh Kumar Jaiswal; Akhilesh Kumar Yadav; Swapnil D. Pandey; Md Azizul Haque
Cadmium (Cd) toxicity is a potential abiotic stress that significantly affects plant growth and development, especially in vegetable crops like muskmelon. Silicon (Si), a vital element, plays an essential role in alleviating Cd-induced stress by various mechanisms. The present study explored the impact of Cd and Si treatments at 25, 50, 100, and 200 mg per kg soil concentrations on the physio-biochemical and molecular changes in muskmelon. Si treatment stabilized key physiological factors like increasing photosynthesis by 16% to 98%, decreasing electrolyte leakage by 28% to 69%, and increasing the relative water content by 7% to 48%, respectively, under increasing concentrations of Cd treatments supplemented with Si, improving the overall plant health. The results indicated that Cd exposure led to increased oxidative damage, as evidenced by the levels of hydrogen peroxide, malondialdehyde, and proline, under a maximum concentration of 200 mg kg−1 with respective fold increases of 3.44, 2.84 and 5.03, while Si supplementation significantly mitigated these effects, with respective fold changes of 0.83, 0.92 and 0.87, under similar concentrations, when compared with the control plants. Si enhanced the activity of the antioxidant enzyme and improved the gene expression associated with oxidative stress, providing a protective effect against Cd-induced damage. Si also promoted nutrient uptake and alleviated the unfavourable impacts of Cd on soil physio-biochemical properties, like pH, electrical conductivity (EC), and organic carbon (OC) content. The combined application of Cd and Si showed a synergistic effect, enhancing plant resilience and reducing Cd accumulation. These findings suggest that Si is an effective strategy for mitigating Cd toxicity, improving plant health, and promoting crop productivity, particularly in muskmelon and other vegetable crops. © 2025 RSC.
Synthesis and applications of nanomaterials for quorum quenching
(Elsevier, 2025) Akhilesh Kumar Yadav
Quorum quenching (QQ) disrupts quorum sensing, a communication process between bacteria that regulates biofilm formation and virulence. Nanomaterials offer QQ as an effective way to reduce antibiotic risk by targeting bacterial communication rather than directly killing bacteria. These materials, including metal nanoparticles, carbon-based nanomaterials, and polymer nanomaterials, can adsorb signaling molecules, catalyze their degradation, or efficiently deliver QQ compounds. They have a high surface area and tunable surface chemistry that enable molecular-level interactions. The properties of oxide nanomaterials are greatly affected by synthesis techniques such as chemical vapor deposition, sol-gel, and coprecipitation, while the polymer nanoparticles are synthesized by solvent evaporation method, solvent transfer method, etc. The versatile application fields of nanomaterials for QQ include medical, agriculture, industry, and environment. However, biocompatibility, safety, stability, and scalability are the issues that need to be addressed. Therefore, in this chapter, we focus on different synthesis methods and applications that can unlock their full potential. © 2026 Elsevier Inc. All rights reserved.