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8. Unique photoluminescence response of MoS2 quantum dots over wide range of As (III) in aqueous media

Author

Ansari, Jamilur R., Naseh, Md. Farhan, Singh, Neelam, Sarkar, Tapan, and Datta, Anindya

Subjects
Physics - Applied Physics
Abstract

Solvothermal synthesis of MoS2 based quantum dots (QDs) and the performance evaluation of bare QDs for the detection of aqueous As (III) oxidative state at room temperature and neutral pH over an extremely wide range (0.1 ppb to 1000 ppb) is reported here. Concentration-dependent photoluminescence (PL) of the QDs was found to be enhanced up to 50 ppb and then suppressed till 1000 ppb, showing two distinctive slopes for enhancement and suppression. Passivation of trap states or defects of QDs may be the possible reason for enhancement, and the formation of extremely small glassy As2S3 particles on the QD surface may be the possible reason for suppression. The pattern of optical absorption of QDs is featureless but shows an enhanced absorbance in the near UV range below 300 nm, which increases with As (III) concentration up to 50 ppb and then decreases following the PL pattern. The MoS2 QDs were characterized by transmission electron microscopy (TEM), Xray diffraction (XRD), UV-Vis, and PL spectroscopy. The enhancement and suppression results can be fitted excellently with the modified Stern-Volmer equation, and the detection of arsenic is possible using these linear fit equations as calibration curves.

Published
2020
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10. Contributors

Author

Abdi, Yaser, primary, Ahmed, Irfan, additional, Ansari, Jamilur R., additional, Arulraj, A., additional, Behrouznejad, Fatemeh, additional, Besleaga, Cristina, additional, Brophy, Rachel Elizabeth, additional, Carmona-Monroy, Paulina, additional, Chandra, Amreesh, additional, Chen, Yonghua, additional, Chowdhury, Faisal Islam, additional, Chowdhury, Towhid H., additional, Cortés-Villena, Alejandro, additional, Cuzminschi, Marina, additional, Derbali, Sarah, additional, Filipoiu, Nicolae, additional, Florea, Mihaela, additional, Galian, Raquel E., additional, Gholipour, Somayeh, additional, Ghosh, Subrata, additional, Grandhi, G. Krishnamurthy, additional, Gussain, Meenakshi, additional, Hadadian, Mahboubeh, additional, Haider, Waseem, additional, Hatamvand, Mohammad, additional, Huang, Wei, additional, Jain, Neha, additional, Kansal, Sakshi, additional, Kateb, Movaffaq, additional, Khalid, Mohammad, additional, Kumar, Dinesh, additional, Liu, Maning, additional, Lu, Chung-Hsin, additional, Mangalaraja, R.V., additional, Manolescu, Andrei, additional, Mariyappan, Pandiyarajan, additional, Meena, Mohan Lal, additional, Mitran, Tudor Luca, additional, Naseh, Md. Farhan, additional, Nemnes, George Alexandru, additional, Pérez-Prieto, Julia, additional, Pintilie, Ioana, additional, Porwal, Shivam, additional, Priya, Surbhi, additional, Rahman, M. Atikur, additional, Rajkumar, C., additional, Roose, Bart, additional, Rosa-Pardo, Ignacio, additional, Sajedi Alvar, Mohammad, additional, Shyju, T.S., additional, Singh, Anupriya, additional, Singh, Rajan Kumar, additional, Singh, Trilok, additional, Solis-Ibarra, Diego, additional, Som, Sudipta, additional, Stancu, Viorica, additional, Sunilbhai, Choudhary Arjun, additional, Tamrakar, Radha, additional, Tomulescu, Andrei G., additional, Vargas, Brenda, additional, Vengatesh, P., additional, Vivo, Paola, additional, Yavari, Mozhgan, additional, and Zhan, Yiqiang, additional

Published
2023
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11. SPR Assisted Diabetes Detection

Author

Sunilbhai, Choudhary Arjun, Alam, Md.Sabir, Sadasivuni, Kishor Kumar, Ansari, Jamilur R., Kasabov, Nikola, Series Editor, Amari, Shun-ichi, Editorial Board Member, Avesani, Paolo, Editorial Board Member, Benuskova, Lubica, Editorial Board Member, Brown, Chris M., Editorial Board Member, Duro, Richard J., Editorial Board Member, Georgieva, Petia, Editorial Board Member, Hou, Zeng-Guang, Editorial Board Member, Indiveri, Giacomo, Editorial Board Member, King, Irwin, Editorial Board Member, Kozma, Robert, Editorial Board Member, König, Andreas, Editorial Board Member, Mandic, Danilo, Editorial Board Member, Masulli, Francesco, Editorial Board Member, Thivierge, JeanPhilippe, Editorial Board Member, Villa, Allessandro E.P., Editorial Board Member, Sadasivuni, Kishor Kumar, editor, Cabibihan, John-John, editor, A M Al-Ali, Abdulaziz Khalid, editor, and Malik, Rayaz A., editor

Published
2022
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15. Synthesis Approaches for Higher Yields of Nanoparticles

Author

Alam, Md. Sabir, primary, Naseh, Md. Farhan, additional, Ansari, Jamilur R., additional, Waziri, Aafrin, additional, Javed, Md. Noushad, additional, Ahmadi, Amirhossein, additional, Saifullah, Muhammad Khalid, additional, and Garg, Arun, additional

Published
2022
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18. List of contributors

Author

Ahamed, M. Basheer, primary, Aly Rakha, Mustafa Farag Ibrahim, additional, Ansari, Jamilur R., additional, Behroozi, Amir Hossein, additional, Chhetry, Ashok, additional, Chin, Ying-Hui, additional, Dall’Agnese, Chunxiang, additional, Dall’Agnese, Yohan, additional, Dayananda, Desagani, additional, Deshmukh, Kalim, additional, Elsa, George, additional, Fakhraai, Zahra, additional, Hemmati, Alireza, additional, Hussain, Chaudhery Mustansar, additional, Jaffari, Zeeshan Haider, additional, Jin, Xin, additional, Johnson, M., additional, Kalluru, Poliraju, additional, Kar, Tathagata, additional, Karthik, Mani, additional, Keçili, Rüstem, additional, Kennedy, L. John, additional, Kesarla, Mohan Kumar, additional, Koirala, Gyan Raj, additional, Kovářík, Tomáš, additional, Kumar, Y. Ravi, additional, Kuthala, Naresh, additional, Lam, Sze-Mun, additional, Li, Haixiang, additional, Liang, Xingyou, additional, Lin, Hua, additional, Liu, Anmin, additional, Ma, Tingli, additional, Mohamed, Abdul Rahman, additional, Mohamed Naseer Ali, M., additional, Muzaffar, Aqib, additional, Nabeela, Kallayi, additional, Nirogi, Aamani, additional, Panda, Dhananjaya, additional, Pandey, Mayank, additional, Parajuli, Deependra, additional, Pasha, S.K. Khadheer, additional, Ponnamma, Deepalekshmi, additional, Rajabathar, Jothi Ramalingam, additional, Rao, Kalagadda Venkateswara, additional, Reddy, M. Sai Bhargava, additional, Reddy, P. Lokanatha, additional, Sadasivuni, Kishor Kumar, additional, Sakthivel, Pachagounder, additional, Samatha, K., additional, Sankar, Ammaiyappan Bharathi, additional, Saraswathi, Kailasa, additional, Schornack, A.M., additional, Shamsabadi, Ahmad Arabi, additional, Sin, Jin-Chung, additional, Soroush, Masoud, additional, Sumina, N.B., additional, Sun, Yuliang, additional, Sun, Zhimei, additional, Sunilbhai, Choudhary Arjun, additional, Thangudu, Suresh, additional, Theerthagiri, Jayaraman, additional, Vankayala, Raviraj, additional, Venkatesh, Nachimuthu, additional, Vijayakumar, Manavalan, additional, Wang, D., additional, Wang, Xiao-Feng, additional, Waseem, Sadiya, additional, Yang, Lin, additional, Yong, Zi-Jun, additional, Yu, Yadong, additional, Zeng, Honghu, additional, Zhang, Chao, additional, Zhang, Q., additional, and Zhou, Jian, additional

Published
2022
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23. Contributors

Author

Abitbol, Tiffany, primary, Aly, Aaliah, additional, Anju, V.P., additional, Annamalai, Pratheep K., additional, Ansari, Jamilur R., additional, Babudri, Francesco, additional, Basirun, Wan Jeffrey, additional, Bras, Julien, additional, Deng, Yulin, additional, Denneulin, Aurore, additional, Giannelli, Rosa, additional, Gopakumar, Deepu A., additional, Hegazy, Sara Mohamed, additional, Houkan, Mohammad Talal, additional, Jiao, Liang, additional, Kannan, Karthik, additional, Kawasaki, Hideya, additional, Kim, Jaehwan, additional, Klemm, Dieter O., additional, Kralisch, Dana, additional, Lindström, Tom, additional, Mohammed, Mohammed Alhaji, additional, Nanjundan, Ashok Kumar, additional, Nizam, P.A., additional, Nzihou, Ange, additional, Operamolla, Alessandra, additional, Pai, Avinash R., additional, Paoloni, Claudio, additional, Pasquini, Daniel, additional, Pottathara, Yasir Beeran, additional, Rahman, Nor Mas Mira Abd, additional, Ram, Farsa, additional, Ramanujam, B.T.S., additional, Sadasivuni, Kishor Kumar, additional, Salleh, Noordini Mohamad, additional, Shanmuganathan, Kadhiravan, additional, Tao, Jie, additional, Thomas, Sabu, additional, Vuong, Tan Phu, additional, and Wawrzyniak, Maxime, additional

Published
2021
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27. MoS2quantum dots and their diverse sensing applications

Author

Namita, Khan, Ariba, Arti, Alam, Naushad, Sadasivuni, Kishor K., and Ansari, Jamilur R.

Abstract

Molybdenum disulfide (MoS2) quantum dots (QDs) are a type of nanomaterial with unique electronic and optical properties. This abstract explores how these dots are made and what they look like, and how they can be used in different kinds of sensing platforms. The review covers their use in gas sensing, biosensing, and environmental monitoring, and explains how MoS2QDs are particularly good at detecting things with high sensitivity and selectivity. By integrating these nanomaterials into sensing devices, we can create new and more effective sensing technologies that can be used in a variety of fields. In addition to their sensing capabilities, MoS2QDs have other advantages too, like being easy to modify, having a stable structure, and being able to change their bandgap. All these things make MoS2QDs adaptable to different sensing platforms, which means they can perform well even in challenging environments. This abstract goes into more detail about the different ways MoS2QDs can be made, how we can study them, and what new developments are happening in the world of sensing technologies. We will also talk about what challenges there are and what the future of MoS2QDs might look like. MoS2, when reduced to a nanoscale, exhibits various applications in the quantum and electronic fields. It is available with both covalent and Van der Waals bonding, allowing MoS2to be utilized in an optimal way for sensing different gases. However, studies related to the sensing characteristics of MoS2are currently insufficient in fields such as optoelectronics, hydrogen testing and evolution, biomedicines, and IOT-based areas. Nevertheless, MoS2can be introduced harmlessly into internal organs as it does not undergo any harmful biological interaction. These numerous features of MoS2make it ideal for use in various sensing approaches.

Published
2024
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31. Fe 3 O 4 Coated SiO 2 Magnetic Nanoparticles for Enhanced Antibacterial Activity and Electrochemical Sensing.

Author

Madhavi, Kumar, Mukesh, Ansari, Jamilur R., Kumar, Vinay, Nagar, Sushil, and Sharma, Ashutosh

Subjects
IRON oxides, ANTIBACTERIAL agents, FOURIER transform infrared spectroscopy, MAGNETIC nanoparticle hyperthermia, NANOPARTICLES analysis, ULTRAVIOLET-visible spectroscopy, TRANSMISSION electron microscopy
Abstract

Multifunctional magnetic composite nanoparticles (NPs) with antibiotics have demonstrated symbiotic effects because of their promising antimicrobial properties. The antimicrobial agent reduces side effects and dosage, and increases drug delivery efficiency. In this study, SiO2 coated over Fe3O4 magnetic nanoparticles (MNPs) were prepared by a solvothermal method. The MNPs were characterized by using X-ray diffraction (XRD), transmission electron microscopy (TEM), ultraviolet-visible spectroscopy (UV-vis), and Fourier transform infrared spectroscopy (FTIR). The antimicrobial tests were carried out using the disk diffusion method. The electrochemical sensing was investigated by cyclic voltammetry with varying As(III) concentrations from 1–10 ppb. The microstructural results showed the formation of spherical-shaped Fe3O4@SiO2 MNPs with 15–30 nm diameters. UV-vis results showed that Fe3O4 NPs promote visible light absorption of Fe3O4@SiO2 MNPs because of well-structured and unvarying shell thickness which is beneficial for the absorption of organic dyes. With an increase in the concentration of As(III), there was a shift in potential and an increase in oxidation peak current, showing the electrocatalytic capacity of the modified electrode. The SiO2 deposited on Fe3O4 displayed an admirable microbial operation. These Fe3O4@SiO2 MNPs are easily absorbed by cells and have the potential to influence bacterial cells both within and outside of the cell membrane, making them an intriguing candidate for use in a variety of biological applications in the future. [ABSTRACT FROM AUTHOR]

Published
2022
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34. Unique photoluminescence response of MoS2 quantum dots over a wide range of As (III) in aqueous media.

Author

Ansari, Jamilur R, Naseh, Md Farhan, Singh, Neelam, Sarkar, Tapan, and Datta, Anindya

Subjects
*PHOTOLUMINESCENCE, *QUANTUM dots, *LIGHT absorption, *TRANSMISSION electron microscopy, *LINEAR equations, *X-ray diffraction
Abstract

We report the solvothermal synthesis of MoS2 based quantum dots (QDs) and the performance evaluation of bare QDs for the detection of aqueous As (III) oxidative state at room temperature and neutral pH over a vast range (0.1−1000 ppb). Concentration-dependent photoluminescence (PL) of the QDs enhances up to 50 ppb and then suppresses till 1000 ppb. It shows two distinctive slopes for enhancement and suppression. The enhancement is possibly due to the passivation of trap states or defects. The formation of tiny glassy As2S3 particles on the QD surface may be the possible reason for suppression. The pattern of optical absorption of QDs follows the similar patterns of PL. Still, it shows an enhanced absorbance in the near UV range below ≤300 nm, which increases with As (III) concentration up to 50 ppb and then decreases following the PL pattern. The MoS2 QDs were characterized by using transmission electron microscopy, x-ray diffraction, UV−Vis, and PL spectroscopy. The enhancement and suppression results were excellently fitted with the modified Stern−Volmer equation. The detection of arsenic is possible using these linear fit equations as calibration curves. [ABSTRACT FROM AUTHOR]

Published
2021
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37. Unique photoluminescence response of MoS 2 quantum dots over a wide range of As (III) in aqueous media.

Author

Ansari JR, Naseh MF, Singh N, Sarkar T, and Datta A

Abstract

We report the solvothermal synthesis of MoS 2 based quantum dots (QDs) and the performance evaluation of bare QDs for the detection of aqueous As (III) oxidative state at room temperature and neutral pH over a vast range (0.1-1000 ppb). Concentration-dependent photoluminescence (PL) of the QDs enhances up to 50 ppb and then suppresses till 1000 ppb. It shows two distinctive slopes for enhancement and suppression. The enhancement is possibly due to the passivation of trap states or defects. The formation of tiny glassy As 2 S 3 particles on the QD surface may be the possible reason for suppression. The pattern of optical absorption of QDs follows the similar patterns of PL. Still, it shows an enhanced absorbance in the near UV range below ≤300 nm, which increases with As (III) concentration up to 50 ppb and then decreases following the PL pattern. The MoS 2 QDs were characterized by using transmission electron microscopy, x-ray diffraction, UV-Vis, and PL spectroscopy. The enhancement and suppression results were excellently fitted with the modified Stern-Volmer equation. The detection of arsenic is possible using these linear fit equations as calibration curves., (© 2021 IOP Publishing Ltd.)

Published
2021
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