Browsing by Author "Rafiq Ahmad"

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Biosensor for the detection of Listeria monocytogenes: emerging trends
(Taylor and Francis Ltd, 2018) Dharmendra Kumar Soni; Rafiq Ahmad; Suresh Kumar Dubey
The early detection of Listeria monocytogenes (L. monocytogenes) and understanding the disease burden is of paramount interest. The failure to detect pathogenic bacteria in the food industry may have terrible consequences, and poses deleterious effects on human health. Therefore, integration of methods to detect and trace the route of pathogens along the entire food supply network might facilitate elucidation of the main contamination sources. Recent research interest has been oriented towards the development of rapid and affordable pathogen detection tools/techniques. An innovative and new approach like biosensors has been quite promising in revealing the foodborne pathogens. In spite of the existing knowledge, advanced research is still needed to substantiate the expeditious nature and sensitivity of biosensors for rapid and in situ analysis of foodborne pathogens. This review summarizes recent developments in optical, piezoelectric, cell-based, and electrochemical biosensors for Listeria sp. detection in clinical diagnostics, food analysis, and environmental monitoring, and also lists their drawbacks and advantages. © 2018, © 2018 Informa UK Limited, trading as Taylor & Francis Group.
Fabrication of an ultra-sensitive hydrazine sensor based on nano-chips shaped nickel hydroxide modified electrodes
(Springer Science and Business Media Deutschland GmbH, 2022) Marya Khan; Rafiq Ahmad; Nirmalya Tripathy; Ajit Khosla; M. Iqbal R. Khan; Prabhash Mishra; Mansoor Ali Syed; Waquar Akhter Ansari
To exploit the possibilities provided by the nanostructure morphology of nano-materials in sensing applications, we synthesized nano-chips shaped nickel hydroxide (Ni(OH)2) nanostructures using hydrothermal method. The nano-chips shaped Ni(OH)2 nanostructure were further utilized to modify the gold working electrode (gold sputtered on glass substrate) to fabricate the hydrazine sensor. The fabricated hydrazine sensor was used for the highly sensitive detection of hydrazine in a water solution. The hydrazine sensor displayed ultra-high sensitivity (1861.25 µA/µM/cm2), a linear response in the concentration range of 0–120 nM, and a lower detection limit (10 nM) during hydrazine sensing. The obtained sensitivity is comparatively higher than any previously reported values. Other features of fabricated hydrazine sensor include a highly reproducible fabrication process, stability, and selectivity. Conceivably, these nano-chips shaped Ni(OH)2 nanostructure hold significant potential for the future applications in nano-material-based chemical/biological sensors. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.
Review - Recent Advances in Nanostructured Graphitic Carbon Nitride as a Sensing Material for Heavy Metal Ions
(Institute of Physics Publishing, 2020) Rafiq Ahmad; Nirmalya Tripathy; Ajit Khosla; Marya Khan; Prabhash Mishra; Waquar Akhter Ansari; Mansoor Ali Syed; Yoon-Bong Hahn
Graphitic carbon nitride (g-C3N4), as a crucial sensing material has attracted intense interest for sensor devices development. Owing to its large specific surface area, excellent physicochemical stability, exceptional electronic band structure, and outstanding electronic, thermal, optical, and mechanical properties. In addition, excellent biocompatibility, unique electroluminescent and photoelectrochemical properties, g-C3N4 nanomaterials contribute to the development of fast, accurate, cost-effective, and reliable sensors. Herein, we provide a comprehensive review on the development of g-C3N4 nanomaterials-based sensors and their potential detection applications for various heavy metal analytes. Furthermore, a comparative sensing performance of sensors, current challenges and prospective of g-C3N4 based nanomaterials are outlined in detail. © The Author(s) 2019. Published by ECS.