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Sahu TK, Manerkar S, Mondkar J, Kalamdani P, Patra S, Kalathingal T, Kaur S. Effect of early total enteral feeding vs incremental feeding in small for gestational age very low birth weight infants: A randomized controlled trial. J Neonatal Perinatal Med 2024; 17:225-232. [PMID: 38640177 DOI: 10.3233/npm-230195] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/21/2024]
Affiliation(s)
- T K Sahu
- Department of Neonatology, Lokmanya Tilak Municipal Medical College and General Hospital, Sion, Mumbai, India
| | - S Manerkar
- Department of Neonatology, Lokmanya Tilak Municipal Medical College and General Hospital, Sion, Mumbai, India
| | - J Mondkar
- Department of Neonatology, Lokmanya Tilak Municipal Medical College and General Hospital, Sion, Mumbai, India
| | - P Kalamdani
- Department of Neonatology, Ex-faculty, Lokmanya Tilak Municipal Medical College and General Hospital, Sion, Mumbai, India
| | - S Patra
- Department of Neonatology, Ex-faculty, Lokmanya Tilak Municipal Medical College and General Hospital, Sion, Mumbai, India
| | - T Kalathingal
- Department of Neonatology, Lokmanya Tilak Municipal Medical College and General Hospital, Sion, Mumbai, India
| | - S Kaur
- Department of Neonatology, Ex-faculty, Lokmanya Tilak Municipal Medical College and General Hospital, Sion, Mumbai, India
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Sahu TK, Kumar N, Chahal S, Jana R, Paul S, Mukherjee M, Tavabi AH, Datta A, Dunin-Borkowski RE, Valov I, Nayak A, Kumar P. Microwave synthesis of molybdenene from MoS 2. Nat Nanotechnol 2023; 18:1430-1438. [PMID: 37666941 PMCID: PMC10716048 DOI: 10.1038/s41565-023-01484-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Accepted: 07/06/2023] [Indexed: 09/06/2023]
Abstract
Dirac materials are characterized by the emergence of massless quasiparticles in their low-energy excitation spectrum that obey the Dirac Hamiltonian. Known examples of Dirac materials are topological insulators, d-wave superconductors, graphene, and Weyl and Dirac semimetals, representing a striking range of fundamental properties with potential disruptive applications. However, none of the Dirac materials identified so far shows metallic character. Here, we present evidence for the formation of free-standing molybdenene, a two-dimensional material composed of only Mo atoms. Using MoS2 as a precursor, we induced electric-field-assisted molybdenene growth under microwave irradiation. We observe the formation of millimetre-long whiskers following screw-dislocation growth, consisting of weakly bonded molybdenene sheets, which, upon exfoliation, show metallic character, with an electrical conductivity of ~940 S m-1. Molybdenene when hybridized with two-dimensional h-BN or MoS2, fetch tunable optical and electronic properties. As a proof of principle, we also demonstrate applications of molybdenene as a surface-enhanced Raman spectroscopy platform for molecular sensing, as a substrate for electron imaging and as a scanning probe microscope cantilever.
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Affiliation(s)
- Tumesh Kumar Sahu
- Department of Physics, Indian Institute of Technology Patna, Bihar, India
- Department of Physics, Shri Ramdeobaba College of Engineering and Management, Nagpur, India
| | - Nishant Kumar
- Department of Physics, Indian Institute of Technology Patna, Bihar, India
| | - Sumit Chahal
- Department of Physics, Indian Institute of Technology Patna, Bihar, India
| | - Rajkumar Jana
- School of Chemical Sciences, Indian Association of Cultivation of Science, Kolkata, India
| | - Sumana Paul
- School of Chemical Sciences, Indian Association of Cultivation of Science, Kolkata, India
| | - Moumita Mukherjee
- School of Chemical Sciences, Indian Association of Cultivation of Science, Kolkata, India
| | - Amir H Tavabi
- Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons and Peter Grünberg Institute, Forschungszentrum Jülich, Jülich, Germany
| | - Ayan Datta
- School of Chemical Sciences, Indian Association of Cultivation of Science, Kolkata, India
| | - Rafal E Dunin-Borkowski
- Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons and Peter Grünberg Institute, Forschungszentrum Jülich, Jülich, Germany
| | - Ilia Valov
- Peter Grünberg Institute (PGI-7), Forschungszentrum Jülich, Jülich, Germany.
- Institute of Electrochemistry and Energy Systems, Bulgarian Academy of Sciences, Sofia, Bulgaria.
| | - Alpana Nayak
- Department of Physics, Indian Institute of Technology Patna, Bihar, India.
| | - Prashant Kumar
- Department of Physics, Indian Institute of Technology Patna, Bihar, India.
- Global Innovative Centre for Advanced Nanomaterials, The University of Newcastle, Newcastle, New South Wales, Australia.
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Sahu TK, Motlag M, Bandyopadhyay A, Kumar N, Cheng GJ, Kumar P. 2+δ-Dimensional Materials via Atomistic Z-Welding. Adv Sci (Weinh) 2022; 9:e2202695. [PMID: 36089664 PMCID: PMC9661819 DOI: 10.1002/advs.202202695] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Revised: 07/27/2022] [Indexed: 06/15/2023]
Abstract
Pivotal to functional van der Waals stacked flexible electronic/excitonic/spintronic/thermoelectric chips is the synergy amongst constituent layers. However; the current techniques viz. sequential chemical vapor deposition, micromechanical/wet-chemical transfer are mostly limited due to diffused interfaces, and metallic remnants/bubbles at the interface. Inter-layer-coupled 2+δ-dimensional materials, as a new class of materials can be significantly suitable for out-of-plane carrier transport and hence prompt response in prospective devices. Here, the discovery of the use of exotic electric field ≈106 V cm- 1 (at microwave hot-spot) and 2 thermomechanical conditions i.e. pressure ≈1 MPa, T ≈ 200 °C (during solvothermal reaction) to realize 2+δ-dimensional materials is reported. It is found that Pz Pz chemical bonds form between the component layers, e.g., CB and CN in G-BN, MoN and MoB in MoS2 -BN hybrid systems as revealed by X-ray photoelectron spectroscopy. New vibrational peaks in Raman spectra (BC ≈1320 cm-1 for the G-BN system and MoB ≈365 cm-1 for the MoS2 -BN system) are recorded. Tunable mid-gap formation, along with diodic behavior (knee voltage ≈0.7 V, breakdown voltage ≈1.8 V) in the reduced graphene oxide-reduced BN oxide (RGO-RBNO) hybrid system is also observed. Band-gap tuning in MoS2 -BN system is observed. Simulations reveal stacking-dependent interfacial charge/potential drops, hinting at the feasibility of next-generation functional devices/sensors.
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Affiliation(s)
- Tumesh Kumar Sahu
- Department of PhysicsIndian Institute of Technology PatnaBihta CampusBihtaPatnaBihar801106India
- Department of PhysicsShri Ramdeo Baba College of Engineering and ManagementNagpurMaharashtra440013India
| | - Maithilee Motlag
- School of Industrial EngineeringPurdue UniversityWest LafayetteIN47907USA
| | | | - Nishant Kumar
- Department of PhysicsIndian Institute of Technology PatnaBihta CampusBihtaPatnaBihar801106India
| | - Gary J. Cheng
- School of Industrial EngineeringPurdue UniversityWest LafayetteIN47907USA
- Institute of Technological SciencesWuhan UniversityWuhan, Hubei430074China
- Birck Nanotechnology CentrePurdue UniversityWest LafayetteIN47907USA
| | - Prashant Kumar
- Department of PhysicsIndian Institute of Technology PatnaBihta CampusBihtaPatnaBihar801106India
- Birck Nanotechnology CentrePurdue UniversityWest LafayetteIN47907USA
- Global Innovation Centre for Advanced NanomaterialsThe University of NewcastleNewcastle2308Australia
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Ranjan P, Sahu TK, Bhushan R, Yamijala SS, Late DJ, Kumar P, Vinu A. Freestanding Borophene and Its Hybrids. Adv Mater 2019; 31:e1900353. [PMID: 31044470 DOI: 10.1002/adma.201900353] [Citation(s) in RCA: 82] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2019] [Revised: 03/14/2019] [Indexed: 05/09/2023]
Abstract
Borophene, an elemental metallic Dirac material is predicted to have unprecedented mechanical and electronic character. Need of substrate and ultrahigh vacuum conditions for deposition of borophene restricts its large-scale applications and significantly hampers the advancement of research on borophene. Herein, a facile and large-scale synthesis of freestanding atomic sheets of borophene through a novel liquid-phase exfoliation and the reduction of borophene oxide is demonstrated. Electron microscopy confirms the presence of β12 , X3 , and their intermediate phases of borophene; X-ray photoelectron spectroscopy, and scanning tunneling microscopy, corroborated with density functional theory band structure calculations, validate the phase purity and the metallic nature. Borophene with excellent anchoring capabilities is used for sensing of light, gas, molecules, and strain. Hybrids of borophene as well as that of reduced borophene oxide with other 2D materials are synthesized, and the predicted superior performance in energy storage is explored. The specific capacity of borophene oxide is observed to be ≈4941 mAh g-1 , which significantly exceeds that of existing 2D materials and their hybrids. These freestanding borophene materials and their hybrids will create a huge breakthrough in the field of 2D materials and could help to develop future generations of devices and emerging applications.
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Affiliation(s)
- Pranay Ranjan
- Department of Physics, Indian Institute of Technology Patna, Bihta, Bihar, 801106, India
| | - Tumesh Kumar Sahu
- Department of Physics, Indian Institute of Technology Patna, Bihta, Bihar, 801106, India
| | - Rebti Bhushan
- Department of Physics, Indian Institute of Technology Patna, Bihta, Bihar, 801106, India
| | | | | | - Prashant Kumar
- Department of Physics, Indian Institute of Technology Patna, Bihta, Bihar, 801106, India
- Birck Nanotechnology Centre, Purdue University, West Lafayette, IN, 47907, USA
| | - Ajayan Vinu
- Global Innovative Center for Advanced Nanomaterials (GICAN), Faculty of Engineering and Built Environment, The University of Newcastle, Callaghan, NSW, 2308, Australia
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Mishra S, Sahu TK, Verma P, Kumar P, Samanta SK. Microwave-Assisted Catalytic Degradation of Brilliant Green by Spinel Zinc Ferrite Sheets. ACS Omega 2019; 4:10411-10418. [PMID: 31460135 PMCID: PMC6648797 DOI: 10.1021/acsomega.9b00914] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Accepted: 06/04/2019] [Indexed: 06/10/2023]
Abstract
Microwave (MW)-assisted catalytic degradation, being an emerging technique, can potentially fill in the technological gap which promises on-demand, prompt, and efficient catalysis, and therefore, suitable MW catalysts are curiously being hunted. Candidature of spinel zinc ferrite (SZFO) atomic sheets as a MW catalyst has thoroughly been investigated in this article. Analytical techniques prove SZFO atomic sheets to be highly crystalline, thermally stable, good dielectric, and superparamagnetic, which render it a potentially strong MW catalyst. Brilliant green (BG) has been demonstrated to be chemisorbed on the SZFO atomic sheets, which upon MW irradiation gets mineralized within 5 min, and the overall efficiency has been observed to be >99%. Total organic carbon removal of ∼80% has been obtained. Ionic chromatography proves the formation of SO4 2- and NO3 - anions which increase with MW exposure time. Liquid chromatography mass spectroscopy studies have established intermediate formations during catalysis. SZFO, established as a uniquely suited and highly efficient MW catalyst for BG, is expected to broaden the horizons of MW-assisted catalytic degradation and lead it toward its broader applications.
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Affiliation(s)
- Sandhya Mishra
- Department
of Chemical and Biochemical Engineering and Department of Physics, Indian Institute of Technology Patna, Bihta, Patna, Bihar 801106, India
| | - Tumesh Kumar Sahu
- Department
of Chemical and Biochemical Engineering and Department of Physics, Indian Institute of Technology Patna, Bihta, Patna, Bihar 801106, India
| | - Priyanshu Verma
- Department
of Chemical and Biochemical Engineering and Department of Physics, Indian Institute of Technology Patna, Bihta, Patna, Bihar 801106, India
| | - Prashant Kumar
- Department
of Chemical and Biochemical Engineering and Department of Physics, Indian Institute of Technology Patna, Bihta, Patna, Bihar 801106, India
- Birck
Nanotechnology Centre, Purdue University, West Lafayette 47906, United States
| | - Sujoy Kumar Samanta
- Department
of Chemical and Biochemical Engineering and Department of Physics, Indian Institute of Technology Patna, Bihta, Patna, Bihar 801106, India
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Nayak MK, Nair HG, Bakshi AK, Sahani PK, Singh S, Khan S, Verma D, Dev V, Sahu TK, Khare M, Kumar V, Bandyopadhyay T, Tripathi RM, Sharma DN. Radiation safety aspects of the operation of first three synchrotron beam lines of Indus-2. Radiat Prot Dosimetry 2015; 164:187-193. [PMID: 25209995 DOI: 10.1093/rpd/ncu273] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2014] [Accepted: 08/03/2014] [Indexed: 06/03/2023]
Abstract
Five synchrotron radiation beam lines are commissioned and now under regular operation at the Synchrotron Radiation Source, Indus-2 at Raja Ramanna Centre For Advanced Technology (RRCAT), Indore, India. Nine beam lines are under trial operation, and six beam lines are in the installation stage. In the early phase of installation of beam lines on Indus-2, three bending magnet beam lines, Extended X-ray Absorption Fine Structure (EXAFS, BL-8), Energy Dispersive X-ray Diffraction (EDXRD, BL-11) and Angle Dispersive X-ray Diffraction (ADXRD, BL-12), were installed and commissioned, after approval from Atomic Energy Regulatory Board (AERB), India. These beam lines are pink (BL-8), white (BL-11) and monochromatic (BL-12), which are housed in specially designed shielded hutches. In order to ensure safety of users and other working personnel from ionizing radiations present in these beam lines, several safety systems are incorporated and safety procedures are followed. The paper describes the radiological safety aspects of the three beam lines during its initial commissioning trials and also the measurements on radiation levels carried out in and around the beam line hutches.
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Affiliation(s)
- M K Nayak
- Health Physics Division, BARC, Mumbai 400085, India
| | | | - A K Bakshi
- Radiological Physics and Advisory Division, BARC, Mumbai 400085, India
| | - P K Sahani
- Indus Operation and Accelerator Physics Design Division, RRCAT, Indore, MP 452013, India
| | - Sunil Singh
- Radiological Physics and Advisory Division, BARC, Mumbai 400085, India
| | - Saleem Khan
- Indus Operation and Accelerator Physics Design Division, RRCAT, Indore, MP 452013, India
| | - Dimple Verma
- Health Physics Division, BARC, Mumbai 400085, India
| | - Vipin Dev
- Indus Operation and Accelerator Physics Design Division, RRCAT, Indore, MP 452013, India
| | - T K Sahu
- Health Physics Division, BARC, Mumbai 400085, India
| | - Mukesh Khare
- Indus Operation and Accelerator Physics Design Division, RRCAT, Indore, MP 452013, India
| | - Vijay Kumar
- Indus Operation and Accelerator Physics Design Division, RRCAT, Indore, MP 452013, India
| | | | - R M Tripathi
- Health Physics Division, BARC, Mumbai 400085, India
| | - D N Sharma
- Health Safety and Environmental group, BARC, Mumbai 400085, India
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Khan S, Sahu TK, Kumar V, Haridas G. Bremsstrahlung photon dose measurement inside Indus-2 synchrotron radiation source ring area. Radiat Prot Environ 2015. [DOI: 10.4103/0972-0464.176162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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