1
|
Singh P, Singh RK, Dixit S, Patel N, Alam M, Dan S, Jain A, Anand K, Gangwar VK, Singh R, Joshi AG, Yusuf SM, Chatterjee S. Double glassy states and large spontaneous and conventional exchange bias in La 1.5Ca 0.5CoFeO 6ferrimagnetic double perovskite. J Phys Condens Matter 2022; 34:375803. [PMID: 35797986 DOI: 10.1088/1361-648x/ac7f74] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2022] [Accepted: 07/07/2022] [Indexed: 06/15/2023]
Abstract
The structural and magnetic properties of hole doped double perovskite La1.5Ca0.5CoFeO6have been investigated by measuring x-ray photoemission spectroscopy, neutron powder diffraction and magnetization. A ferrimagnetic transition is observed atTC∼ 167 K. The presence of anti-site disorder (ASD) in La1.5Ca0.5CoFeO6has also been demonstrated. Double re-entrant cluster glass transitions (T1∼ 11 K andTS∼ 35 K) were observed which has been attributed to the ASD effect. The presence of both large spontaneous exchange biasHSEB∼ 2.106 kOe and giant conventional exchange biasHCEB∼ 1.56 T at 5 K has also been observed which can be attributed to the coexistence of long range magnetic ordering and glassy state. The experimental observations were explained with the results obtained by the density functional theory calculation. The presence of double glassy states, large exchange-bias effect and different magnetic phases make this system a potential candidate for spintronic applications.
Collapse
Affiliation(s)
- Prajyoti Singh
- Department of Physics, Indian Institute of Technology (BHU), Varanasi 221005, India
| | - Rahul K Singh
- Department of Physics, Indian Institute of Technology (BHU), Varanasi 221005, India
| | - Srishti Dixit
- Department of Physics, Indian Institute of Technology (BHU), Varanasi 221005, India
| | - Neha Patel
- Department of Physics, Indian Institute of Technology (BHU), Varanasi 221005, India
| | - Mohd Alam
- Department of Physics, Indian Institute of Technology (BHU), Varanasi 221005, India
| | - Sambhab Dan
- Department of Physics, Indian Institute of Technology (BHU), Varanasi 221005, India
| | - A Jain
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
- Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India
| | - K Anand
- Department of Physics, Indian Institute of Technology (BHU), Varanasi 221005, India
| | - Vinod K Gangwar
- Department of Physics, Indian Institute of Technology (BHU), Varanasi 221005, India
| | - Rahul Singh
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - Amish G Joshi
- CSIR-National Physical Laboratory, Dr K.S. Krishnan Road, New Delhi 110012, India
| | - S M Yusuf
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
- Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India
| | - Sandip Chatterjee
- Department of Physics, Indian Institute of Technology (BHU), Varanasi 221005, India
| |
Collapse
|
2
|
Dwivedi GD, Kumawat SM, Yen TW, Wang CW, Chandrasekhar Kakarla D, Joshi AG, Yang HD, Huang SM, Chou H. Understanding the correlation between orbital degree of freedom, lattice-striction and magneto-dielectric coupling in ferrimagnetic Mn 1.5Cr 1.5O 4. J Phys Condens Matter 2021; 33:505802. [PMID: 34547729 DOI: 10.1088/1361-648x/ac28c3] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2021] [Accepted: 09/21/2021] [Indexed: 06/13/2023]
Abstract
Dielectric anomaly observed in cubic Mn1.5Cr1.5O4around ferrimagnetic ordering temperature (TN) suggests a possible magneto-dielectric coupling in the system. This report confirms the presence of a weak but significant magneto-dielectric coupling in the system. Theab initiocalculations show a band gap of around 1.2 eV, with Fermi-level closer to the conduction band. The major features of conduction band nearest to the Fermi-level correspond todxzandd3z2-r2orbitals of Mn3+ion. Temperature-dependent neutron diffraction results show a rapid decay in structural parameters (lattice-striction and transition metal-oxygen bond length) aroundTN.We confirmed that these changes in structural parameters atTNare not related to structural transition but the consequences of orbital-ordering of Mn3+. The rapid decay in transition metal-oxygen bond length under internal magnetism of the system shows that magnetism could certainly manipulate the electric dipole moment and hence the dielectric constant of the system. Magneto-striction acts as a link between magnetic and dielectric properties.
Collapse
Affiliation(s)
- G D Dwivedi
- Department of Physics, and Center of Crystal Research, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan, Republic of China
| | - S M Kumawat
- Department of Physics, and Center of Crystal Research, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan, Republic of China
| | - Tsung-Wen Yen
- Department of Physics, and Center of Crystal Research, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan, Republic of China
| | - C W Wang
- National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan, Republic of China
| | - D Chandrasekhar Kakarla
- Department of Physics, and Center of Crystal Research, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan, Republic of China
| | - Amish G Joshi
- CSIR-Central Glass & Ceramic Research Institute, Naroda Centre, 168-169 Naroda Industrial Estate, Ahmedabad-382 330, India
- CSIR-National Physical Laboratory, Dr. K. S. Krishnan Road, New Delhi 110012, India
| | - H D Yang
- Department of Physics, and Center of Crystal Research, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan, Republic of China
| | - Shin-Ming Huang
- Department of Physics, and Center of Crystal Research, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan, Republic of China
| | - H Chou
- Department of Physics, and Center of Crystal Research, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan, Republic of China
| |
Collapse
|
3
|
Alam M, Singh P, Anand K, Pal A, Ghosh S, Ghosh AK, Singh RK, Joshi AG, Chatterjee S. Extraordinary magnetic properties of double perovskite Eu 2CoMnO 6wide band gap semiconductor. J Phys Condens Matter 2020; 32:365802. [PMID: 32541098 DOI: 10.1088/1361-648x/ab8ecc] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2020] [Accepted: 04/30/2020] [Indexed: 06/11/2023]
Abstract
Some novel magnetic behaviours in double perovskite Eu2CoMnO6(ECMO) have been reported. The x-ray photoemission spectroscopy study shows the presence of mixed valence states of transition metal ions. The UV-visible absorption spectroscopic study suggests that the ECMO has a direct wide band gap. A second-order magnetic phase transition as a sudden jump in the magnetization curve has been observed around 124.5 K. The large bifurcation between the zero field cooling and field cooling, suggests existence of strong spin frustration in the system. The inverse DC susceptibility confirms the presence of the Griffiths like phase. Sharp steps in magnetization have been observed in theM-Hcurve at 2 K, which vanishes on increasing temperature. The AC susceptibility study demonstrates the Hopkinson like effect as well as the presence of volume spin-glass-like behaviour. The temperature dependent Raman spectrum shows the presence of spin-phonon coupling.
Collapse
Affiliation(s)
- Mohd Alam
- Department of Physics, Indian Institute of Technology (B.H.U.), Varanasi-221005, India
| | - Prajyoti Singh
- Department of Physics, Indian Institute of Technology (B.H.U.), Varanasi-221005, India
| | - Khyati Anand
- Department of Physics, Indian Institute of Technology (B.H.U.), Varanasi-221005, India
| | - Arkadeb Pal
- Department of Physics, Indian Institute of Technology (B.H.U.), Varanasi-221005, India
| | - Surajit Ghosh
- Department of Physics, Indian Institute of Technology (B.H.U.), Varanasi-221005, India
| | - A K Ghosh
- Department of Physics, Banaras Hindu University, Varanasi-221005, India
| | - Ranjan K Singh
- Department of Physics, Banaras Hindu University, Varanasi-221005, India
| | - Amish G Joshi
- CSIR - Central Glass & Ceramic Research Institute, Rajkot-382330, India
| | - Sandip Chatterjee
- Department of Physics, Indian Institute of Technology (B.H.U.), Varanasi-221005, India
| |
Collapse
|
4
|
Pal A, Singh P, Gangwar VK, Joshi AG, Khuntia P, Dwivedi GD, Gupta PK, Alam M, Anand K, Sethupathi K, Ghosh AK, Chatterjee S. Probing the Griffiths like phase, unconventional dual glassy states, giant exchange bias effects and its correlation with its electronic structure in Pr 2-x Sr x CoMnO 6. J Phys Condens Matter 2020; 32:215801. [PMID: 31671415 DOI: 10.1088/1361-648x/ab5326] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Crystal, electronic structure, dc and ac magnetization properties of the hole substituted (Sr2+) and partially B-site disordered double perovskite Pr2-x Sr x CoMnO6 system have been investigated. The XRD pattern analysis showed a systematic decrease in the lattice parameters owing to the enhanced oxidation states of the Co/Mn ions. The electronic structure study by XPS measurements suggested the presence of mixed valence states of the B-site ions (Co2+ /Co3+ and Mn3+ /Mn4+) with significant enhancement of the average oxidation states due to hole doping. The mere absence of electronic states near the Fermi level in the valence band (VB) spectra for both pure (x = 0.0) and Sr doped (x = 0.5) systems indicated the insulating nature of the samples. Sr substitution is observed to increase the spectral weight near the Fermi level suggesting for an enhanced conductivity of the hole doped system. The dc magnetization data divulged a Griffiths like phase above the long-range ordering temperature. A typical re-entrant spin glass like phase driven by the inherent anti-site disorder (ASD) has been recognized by ac susceptibility study for both the pure and doped systems. Most interestingly, the emergence of a new cluster glass like phase (immediately below the magnetic ordering temperature and above the spin-glass transition temperature) solely driven by the Sr substitution has been unravelled by ac magnetization dynamics study. Observation of these dual glassy states in a single system is scarce and hence placed the present system amongst the rare materials. The isothermal magnetization measurements further probed the exhibition of the giant exchange bias effect originated from the interfacial exchange interactions due to existence of low temperature antiferromagnetic clusters embedded in the glassy matrix.
Collapse
Affiliation(s)
- Arkadeb Pal
- Department of physics, Indian Institute of Technology (BHU) Varanasi, India. Department of physics, Indian Institute of Technology, Madras, India
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
5
|
Pal A, Ghosh S, Joshi AG, Kumar S, Patil S, Gupta PK, Singh P, Gangwar VK, Prakash P, Singh RK, Schwier EF, Sawada M, Shimada K, Ghosh AK, Das A, Chatterjee S. Investigation of multi-mode spin-phonon coupling and local B-site disorder in Pr 2CoFeO 6 by Raman spectroscopy and correlation with its electronic structure by XPS and XAS studies. J Phys Condens Matter 2019; 31:275802. [PMID: 30921773 DOI: 10.1088/1361-648x/ab144f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Electronic structure of Pr2CoFeO6 (at 300 K) was investigated by x-ray photoemission spectroscopy (XPS) and x-ray absorption spectroscopy techniques. All three cations, i.e. Pr, Co and Fe were found to be trivalent in nature. XPS valance band analysis suggested the system to be insulating in nature. The analysis suggested that Co3+ ions exist in low spin state in the system. Moreover, Raman spectroscopy study indicated the random distribution of the B-site ions (Co/Fe) triggered by same charge states. In temperature-dependent Raman study, the relative heights of the two observed phonon modes exhibited anomalous behaviour near magnetic transition temperature T N ~ 270 K, thus indicating towards interplay between spin and phonon degrees of freedom in the system. Furthermore, clear anomalous softening was observed below T N which confirmed the existence of strong spin-phonon coupling occurring for at least two phonon modes of the system. The line width analysis of the phonon modes essentially ruled out the role of magnetostriction effect in the observed phonon anomaly. The investigation of the lattice parameter variation across T N (obtained from the temperature-dependent neutron diffraction measurements) further confirmed the existence of the spin-phonon coupling.
Collapse
Affiliation(s)
- Arkadeb Pal
- Department of Physics, Indian Institute of Technology (BHU), Varanasi 221005, India
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
6
|
Roy S, Joshi AG, Chatterjee S, Ghosh AK. Local symmetry breaking in SnO 2 nanocrystals with cobalt doping and its effect on optical properties. Nanoscale 2018; 10:10664-10682. [PMID: 29845170 DOI: 10.1039/c7nr07427a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
X-ray photoemission spectroscopy (XPS), X-ray diffraction (XRD) and transmission electron microscopy (TEM) have been used to study the structural and morphological characteristics of cobalt doped tin(iv) oxide (Sn1-xCoxO2; 0 ≤ x ≤ 0.04) nanocrystals synthesized by a chemical co-precipitation technique. Electronic structure analysis using X-ray photoemission spectroscopy (XPS) shows the formation of tin interstitials (Sni) and reduction of oxygen vacancies (VO) in the host lattice on Co doping and that the doped Co exists in mixed valence states of +2 and +3. Using XRD, the preferential position of the Sni and doped Co in the unit cell of the nanocrystals have been estimated. Rietveld refinement of XRD data shows that samples are of single phase and variation of lattice constants follows Vegard's law. XRD and TEM measurements show that the crystallite size of the nanocrystals decrease with increase in Co doping concentration. SAED patterns confirm the monocrystalline nature of the samples. The study of the lattice dynamics using Raman spectroscopy and Fourier transform infrared (FTIR) spectroscopy shows the existence of many disorder activated forbidden optical phonon modes, along with the corresponding classical modes, signifying Co induced local symmetry breaking in the nanocrystals. UV-Vis spectroscopy shows that the optical band gap has red shifted with increase in doping concentration. The study of Urbach energy confirms the increase in disorder in the nanocrystals with Co doping. Local symmetry breaking induced UV emission along with violet, blue and green luminescence has been observed from the PL study. The spectral contribution of UV emission decreases and green luminescence increases with increase in doping. Using PL, in conjunction with Raman spectroscopy, the type of oxygen vacancy induced in the nanocrystals on Co doping has been confirmed and the position of the defect levels in the forbidden zone (w.r.t. the optical band gap) has been studied.
Collapse
Affiliation(s)
- S Roy
- Materials Research Laboratory, Department of Physics, Institute of Science, Banaras Hindu University, Varanasi-221005, India.
| | | | | | | |
Collapse
|
7
|
Haque Z, Thakur GS, Selvan GK, Block T, Janka O, Pöttgen R, Joshi AG, Parthasarathy R, Arumugam S, Gupta LC, Ganguli AK. Valence State of Eu and Superconductivity in Se-Substituted EuSr 2Bi 2S 4F 4 and Eu 2SrBi 2S 4F 4. Inorg Chem 2018; 57:37-44. [PMID: 29236485 DOI: 10.1021/acs.inorgchem.7b01555] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Recently, we reported the synthesis and investigations of EuSr2Bi2S4F4 and Eu2SrBi2S4F4. We have now been able to induce superconductivity in EuSr2Bi2S4F4 by Se substitution at the S site (isovalent substitution) with Tc = 2.9 K in EuSr2Bi2S2Se2F4. The other compound, Eu2SrBi2S4F4, shows a significant enhancement of Tc. In Se-substituted Eu2SrBi2S4-xSexF4, we find Tc = 2.6 K for x = 1.5 and Tc = 2.8 K for x = 2, whereas Tc = 0.4 K in the Se-free sample. In addition to superconductivity, an important effect associated with Se substitution is that it gives rise to remarkable changes in the Eu valence. Our 151Eu Mössbauer and X-ray photoemission spectroscopic measurements show that Se substitution in both of the compounds Eu2SrBi2S4F4 and EuSr2Bi2S4F4 gives rise to an increase in the Eu2+ component in the mixed-valence state of Eu.
Collapse
Affiliation(s)
- Zeba Haque
- Department of Chemistry, Indian Institute of Technology , New Delhi 110016, India
| | - Gohil Singh Thakur
- Department of Chemistry, Indian Institute of Technology , New Delhi 110016, India.,Max-Planck-Institute for Chemical Physics of Solids , Dresden 01187, Germany
| | - Ganesan Kalai Selvan
- Centre for High Pressure Research, School of Physics, Bharathidasan University , Tiruchirapalli 620024, India
| | - Theresa Block
- Institut für Anorganische und Analytische Chemie, Universität Münster , Corrensstrasse 30, 48149 Münster, Germany
| | - Oliver Janka
- Institut für Anorganische und Analytische Chemie, Universität Münster , Corrensstrasse 30, 48149 Münster, Germany
| | - Rainer Pöttgen
- Institut für Anorganische und Analytische Chemie, Universität Münster , Corrensstrasse 30, 48149 Münster, Germany
| | - Amish G Joshi
- CSIR-National Physical Laboratory , Dr. K.S. Krishnan Road, New Delhi 110012, India
| | | | - Sonachalam Arumugam
- Centre for High Pressure Research, School of Physics, Bharathidasan University , Tiruchirapalli 620024, India
| | - Laxmi Chand Gupta
- Department of Chemistry, Indian Institute of Technology , New Delhi 110016, India
| | - Ashok Kumar Ganguli
- Department of Chemistry, Indian Institute of Technology , New Delhi 110016, India.,Institute of Nano Science & Technology , Habitat Centre, Mohali 160062, India
| |
Collapse
|
8
|
Abstract
We synthesized double perovskite Pr2FeCrO6 by solid-state method. Analysis of its X-ray powder diffraction shows that the compound crystallizes in a centrosymmetric structure with space group Pbnm. Our X-ray photoelectron spectroscopy (XPS) studies show that all the cations are present in +3 oxidation state. Magnetization studies of Pr2FeCrO6 show that the material is paramagnetic at room temperature and undergoes a magnetic transition below TCM = 250 K. We observe clear magnetic hysteresis loop, for example, below 150 K. A low remnant magnetization Mr, ∼0.05 μB/f. u., is inferred from the observed magnetic hysteresis loop. 57Fe Mössbauer study at 25 K shows a high hyperfine magnetic field of ∼53 T at the Fe nucleus, which corresponds to a magnetic moment of ∼6-7 μB/Fe. These two results together suggest a ferrimagnetic (nearly compensated or canted) ordering of the Fe moments. Mössbauer studies close to the ferrimagnetic ordering temperature suggest interesting magnetic relaxation effects. A dielectric anomaly observed at TCE = 453 K signals a ferroelectric ↔ paraelectric phase transition. We observe at room temperature a clear and well-defined ferroelectric hysteresis loop, PS = 1.04 μC/cm2, establishing ferroelectricity in the material. From these results, we conclude that Pr2FeCrO6 is a type I multiferroic (TCE > TCM).
Collapse
Affiliation(s)
- Nibedita Das
- Department of Chemistry, Indian Institute of Technology Delhi , Hauz Khas, New Delhi 110016, India
| | - Satyendra Singh
- Centre for Nano Science, Jawaharlal Nehru University , New Delhi 110067, India
| | - Amish G Joshi
- CSIR National Physical Laboratory , Dr. K. S. Krishnan Road, New Delhi 110012, India
| | | | | | - Laxmi Chand Gupta
- Department of Chemistry, Indian Institute of Technology Delhi , Hauz Khas, New Delhi 110016, India
| | - Ashok Kumar Ganguli
- Department of Chemistry, Indian Institute of Technology Delhi , Hauz Khas, New Delhi 110016, India.,Institute of Nano Science and Technology , Sector 24, Mohali, Punjab 160062, India
| |
Collapse
|
9
|
Haque Z, Thakur GS, Parthasarathy R, Gerke B, Block T, Heletta L, Pöttgen R, Joshi AG, Selvan GK, Arumugam S, Gupta LC, Ganguli AK. Unusual Mixed Valence of Eu in Two Materials-EuSr 2Bi 2S 4F 4 and Eu 2SrBi 2S 4F 4: Mössbauer and X-ray Photoemission Spectroscopy Investigations. Inorg Chem 2017; 56:3182-3189. [PMID: 28245123 DOI: 10.1021/acs.inorgchem.6b01926] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We have synthesized two new Eu-based compounds, EuSr2Bi2S4F4 and Eu2SrBi2S4F4, which are derivatives of Eu3Bi2S4F4, an intrinsic superconductor with Tc = 1.5 K. They belong to a tetragonal structure (SG: I4/mmm, Z = 2), similar to the parent compound Eu3Bi2S4F4. Our structural and 151Eu Mössbauer spectroscopy studies show that, in EuSr2Bi2S4F4, Eu-atoms exclusively occupy the crystallographic 2a-sites. In Eu2SrBi2S4F4, 2a-sites are fully occupied by Eu-atoms and the other half of Eu-atoms and Sr-atoms together fully occupy 4e-sites in a statistical distribution. In both compounds Eu atoms occupying the crystallographic 2a-sites are in a homogeneous mixed valent state ∼2.6-2.7. From our magnetization studies in an applied H ≤ 9 T, we infer that the valence of Eu-atoms in Eu2SrBi2S4F4 at the 2a-sites exhibits a shift toward 2+. Our XPS studies corroborate the occurrence of valence fluctuations of Eu and after Ar-ion sputtering show evidence of enhanced population of Eu2+-states. Resistivity measurements, down to 2 K, suggest a semimetallic nature for both compounds.
Collapse
Affiliation(s)
- Zeba Haque
- Department of Chemistry, Indian Institute of Technology , New Delhi 110016, India
| | - Gohil Singh Thakur
- Department of Chemistry, Indian Institute of Technology , New Delhi 110016, India
| | | | - Birgit Gerke
- Institut für Anorganische und Analytische Chemie, Universität Münster , Corrensstrasse 30, D-48149 Münster, Germany
| | - Theresa Block
- Institut für Anorganische und Analytische Chemie, Universität Münster , Corrensstrasse 30, D-48149 Münster, Germany
| | - Lukas Heletta
- Institut für Anorganische und Analytische Chemie, Universität Münster , Corrensstrasse 30, D-48149 Münster, Germany
| | - Rainer Pöttgen
- Institut für Anorganische und Analytische Chemie, Universität Münster , Corrensstrasse 30, D-48149 Münster, Germany
| | - Amish G Joshi
- CSIR-National Physical Laboratory , Dr. K.S. Krishnan Road, New Delhi 110012, India
| | - Ganesan Kalai Selvan
- Centre for High Pressure Research, School of Physics, Bharathidasan University , Tiruchirapalli 620024, India
| | - Sonachalam Arumugam
- Centre for High Pressure Research, School of Physics, Bharathidasan University , Tiruchirapalli 620024, India
| | - Laxmi Chand Gupta
- Department of Chemistry, Indian Institute of Technology , New Delhi 110016, India
| | - Ashok Kumar Ganguli
- Department of Chemistry, Indian Institute of Technology , New Delhi 110016, India.,Institute of Nano Science & Technology , Habitat Centre, Mohali 160062, India
| |
Collapse
|
10
|
Kumar S, Dwivedi GD, Kumar S, Mathur RB, Saxena U, Ghosh AK, Joshi AG, Yang HD, Chatterjee S. Structural, transport and optical properties of (La0.6Pr0.4)0.65Ca0.35MnO3 nanocrystals: a wide band-gap magnetic semiconductor. Dalton Trans 2015; 44:3109-17. [PMID: 25567084 DOI: 10.1039/c4dt03452j] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
(La0.6Pr0.4)0.65Ca0.35MnO3 system has been synthesized via a sol-gel route at different sintering temperatures. Structural, transport and optical measurements have been carried out to investigate (La0.6Pr0.4)0.65Ca0.35MnO3 nanoparticles. Raman spectra show that Jahn-Teller distortion has been decreased due to the presence of Ca and Pr in A-site. Magnetic measurements provide a Curie temperature around 200 K and saturation magnetization (MS) of about 3.43μB/Mn at 5 K. X-ray photoemission spectroscopy study suggests that Mn exists in a dual oxidation state (Mn(3+) and Mn(4+)). Resistivity measurements suggest that charge-ordered states of Mn(3+) and Mn(4+), which might be influenced by the presence of Pr, have enhanced insulating behavior in (La0.6Pr0.4)0.65Ca0.35MnO3. Band gap estimated from UV-Vis spectroscopy measurements comes in the range of wide band gap semiconductors (∼3.5 eV); this makes (La0.6Pr0.4)0.65Ca0.35MnO3 a potential candidate for device application.
Collapse
Affiliation(s)
- Satyam Kumar
- Department of Physics, Banaras Hindu University, Varanasi-221005, India
| | | | | | | | | | | | | | | | | |
Collapse
|
11
|
Shukla KK, Shahi P, S. G, Kumar A, Ghosh AK, Singh R, Sharma N, Das A, Sinha AK, Joshi AG, Nigam AK, Chatterjee S. Magnetic and optical properties of Fe doped crednerite CuMnO2. RSC Adv 2015. [DOI: 10.1039/c5ra13305j] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A geometrically frustrated magnetic CuMnO2 system has been investigated because of its rich magnetic properties.
Collapse
Affiliation(s)
- Kaushal K. Shukla
- Department of Physics
- Indian Institute of Technology (Banaras Hindu University)
- Varanasi-221005
- India
| | - P. Shahi
- Department of Physics
- Indian Institute of Technology (Banaras Hindu University)
- Varanasi-221005
- India
| | - Gopal S.
- School of Material Science & Technology
- Indian Institute of Technology, (Banaras Hindu University)
- Varanasi 221005
- India
| | - A. Kumar
- Department of Physics
- Indian Institute of Technology (Banaras Hindu University)
- Varanasi-221005
- India
| | - A. K. Ghosh
- Department of Physics
- Banaras Hindu University
- Varanasi 221005
- India
| | - Ripandeep Singh
- Solid State Physics Division
- Bhabha Atomic Research Centre
- Mumbai 400085
- India
| | - Neetika Sharma
- Solid State Physics Division
- Bhabha Atomic Research Centre
- Mumbai 400085
- India
| | - A. Das
- Solid State Physics Division
- Bhabha Atomic Research Centre
- Mumbai 400085
- India
| | - A. K. Sinha
- Indus Synchrotrons Utilization Division
- Raja Ramanna Centre for Advanced Technology
- Indore 452013
- India
| | | | - A. K. Nigam
- Department of CMP & MS Tata Institute of Fundamental Research
- Mumbai
- India
| | - Sandip Chatterjee
- Department of Physics
- Indian Institute of Technology (Banaras Hindu University)
- Varanasi-221005
- India
| |
Collapse
|
12
|
Reddy BN, Deepa M, Joshi AG. Highly conductive poly(3,4-ethylenedioxypyrrole) and poly(3,4-ethylenedioxythiophene) enwrapped Sb2S3nanorods for flexible supercapacitors. Phys Chem Chem Phys 2014; 16:2062-71. [DOI: 10.1039/c3cp53554a] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
13
|
Srivastava S, Kumar V, Ali MA, Solanki PR, Srivastava A, Sumana G, Saxena PS, Joshi AG, Malhotra BD. Electrophoretically deposited reduced graphene oxide platform for food toxin detection. Nanoscale 2013; 5:3043-3051. [PMID: 23463146 DOI: 10.1039/c3nr32242d] [Citation(s) in RCA: 85] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Reduced graphene oxide (RGO) due to its excellent electrochemical properties and large surface area, has recently aroused much interest for electrochemical biosensing application. Here, the chemically active RGO has been synthesized and deposited onto an indium tin oxide (ITO) coated glass substrate by the electrophoretic deposition technique. This novel platform has been utilized for covalent attachment of the monoclonal antibodies of aflatoxin B1 (anti-AFB1) for food toxin (AFB1) detection. The electron microscopy, X-ray diffraction, and UV-visible studies reveal successful synthesis of reduced graphene oxide while the XPS and FTIR studies suggest its carboxylic functionalized nature. The electrochemical sensing results of the anti-AFB1/RGO/ITO based immunoelectrode obtained as a function of aflatoxin concentration show high sensitivity (68 μA ng(-1) mL cm(-2)) and improved detection limit (0.12 ng mL(-1)). The association constant (ka) for antigen-antibody interaction obtained as 5 × 10(-4) ng mL(-1) indicates high affinity of antibodies toward the antigen (AFB1).
Collapse
Affiliation(s)
- Saurabh Srivastava
- Department of Science and Technology, Center on Biomolecular Electronics, Biomedical Instrumentation Section, National Physical Laboratory, Dr. K.S. Krishnan Road, New Delhi-110012, India
| | | | | | | | | | | | | | | | | |
Collapse
|
14
|
Kumar S, Jagadeesan KK, Joshi AG, Sumana G. Immuno-CoPS (conducting paper strips) for futuristic cost-effective cancer diagnostics. RSC Adv 2013. [DOI: 10.1039/c3ra40491a] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
|
15
|
|
16
|
Bhandari S, Deepa M, Joshi AG, Saxena AP, Srivastava AK. Revelation of graphene-Au for direct write deposition and characterization. Nanoscale Res Lett 2011; 6:424. [PMID: 21711490 PMCID: PMC3211841 DOI: 10.1186/1556-276x-6-424] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/09/2010] [Accepted: 06/15/2011] [Indexed: 05/31/2023]
Abstract
Graphene nanosheets were prepared using a modified Hummer's method, and Au-graphene nanocomposites were fabricated by in situ reduction of a gold salt. The as-produced graphene was characterized by X-ray photoelectron spectroscopy, ultraviolet-visible spectroscopy, scanning electron microscopy, and high-resolution transmission electron microscopy (HR-TEM). In particular, the HR-TEM demonstrated the layered crystallites of graphene with fringe spacing of about 0.32 nm in individual sheets and the ultrafine facetted structure of about 20 to 50 nm of Au particles in graphene composite. Scanning helium ion microscopy (HIM) technique was employed to demonstrate direct write deposition on graphene by lettering with gaps down to 7 nm within the chamber of the microscope. Bare graphene and graphene-gold nanocomposites were further characterized in terms of their composition and optical and electrical properties.
Collapse
Affiliation(s)
- Shweta Bhandari
- National Physical Laboratory, Council of Scientific and Industrial Research, Dr. K.S. Krishnan Road, New Delhi, 110 012, India
| | - Melepurath Deepa
- Department of Chemistry, Indian Institute of Technology Hyderabad, Hyderabad, 502205, India
| | - Amish G Joshi
- National Physical Laboratory, Council of Scientific and Industrial Research, Dr. K.S. Krishnan Road, New Delhi, 110 012, India
| | - Aditya P Saxena
- National Physical Laboratory, Council of Scientific and Industrial Research, Dr. K.S. Krishnan Road, New Delhi, 110 012, India
| | - Avanish K Srivastava
- National Physical Laboratory, Council of Scientific and Industrial Research, Dr. K.S. Krishnan Road, New Delhi, 110 012, India
| |
Collapse
|
17
|
Deepa M, Kharkwal A, Joshi AG, Srivastava AK. Charge Transport and Electrochemical Response of Poly(3,4-ethylenedioxypyrrole) Films Improved by Noble-Metal Nanoparticles. J Phys Chem B 2011; 115:7321-31. [DOI: 10.1021/jp201055y] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Melepurath Deepa
- Department of Chemistry, Indian Institute of Technology Hyderabad, Ordnance Factory Estate, Yeddumailaram-502205, Andhra Pradesh, India
| | - Aneeta Kharkwal
- National Physical Laboratory, Dr. K. S. Krishnan Road, New Delhi-110012, India
| | - Amish G. Joshi
- National Physical Laboratory, Dr. K. S. Krishnan Road, New Delhi-110012, India
| | | |
Collapse
|
18
|
Saxena AP, Deepa M, Joshi AG, Bhandari S, Srivastava AK. Poly(3,4-ethylenedioxythiophene)-ionic liquid functionalized graphene/reduced graphene oxide nanostructures: improved conduction and electrochromism. ACS Appl Mater Interfaces 2011; 3:1115-1126. [PMID: 21413722 DOI: 10.1021/am101255a] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Nanocomposite assemblies of poly(3,4-ethylenedioxythiophene) (PEDOT), embedded with (a) fluoro alkyl phosphate based ionic liquid functionalized graphene (ILFG) and (b) reduced graphene oxide (RGO) prepared from a modified Hummers' method, have been synthesized. Defect free graphene nanosheets within the size of a few nanometers were achieved in the PEDOT-ILFG nanocomposite. In contrast, structures comprising graphene oxide wrinkles interspersed with the amorphous polymer were obtained in the PEDOT-RGO nanocomposite. X-ray photoelectron spectroscopy showed that neat ILFG was considerably less oxidized as compared to the neat RGO, which ratified the superiority of the ionic liquid functionalization strategy over the conventional chemical approach, for exfoliating graphite. Substantially higher electrochemical activity, improved ionic/electronic conductivity, much faster switching rates, and an almost ballistic enhancement in the electrochromic coloration efficiency attained for the PEDOT-ILFG nanocomposite in comparison to PEDOT-RGO film were irrefutable proofs that demonstrated the ability of the ionic liquid to not only fortify the structure of graphene but also facilitate charge transport through the bulk of the film, by providing less impeded pathways. Since PEDOT-ILFG/-RGO nanocomposites of good uniformity have been achieved, this, to some extent, addresses the challenge associated with the processing of graphene based high performance materials for practical applications.
Collapse
Affiliation(s)
- Aditya P Saxena
- National Physical Laboratory, Dr. K.S. Krishnan Road, New Delhi, 110012 India
| | | | | | | | | |
Collapse
|
19
|
Kharkwal A, Deepa M, Joshi AG, Srivastava AK. Red to Blue High Electrochromic Contrast and Rapid Switching Poly(3,4-ethylenedioxypyrrole)-Au/Ag Nanocomposite Devices for Smart Windows. Chemphyschem 2011; 12:1176-88. [DOI: 10.1002/cphc.201000973] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2010] [Revised: 02/15/2011] [Indexed: 11/12/2022]
|
20
|
Haranath D, Sahai S, Singh S, Joshi AG, Husain M, Shanker V. Highly efficient, tunable and bright photoluminescence from hydrophobic silica gel nanoparticles. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm11874a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
21
|
Soni JL, Joshi AG, Khan AG. Osmotic erythrocytic fragility in Borrella anseria infected normal and dwarf chickens. Zentralbl Veterinarmed B 2010; 27:616-21. [PMID: 7468003 DOI: 10.1111/j.1439-0450.1980.tb01724.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
|
22
|
|
23
|
Bhandari S, Deepa M, Pahal S, Joshi AG, Srivastava AK, Kant R. A dual electrochrome of poly-(3,4-ethylenedioxythiophene) doped by N,N'-bis(3-sulfonatopropyl)-4-4'-bipyridinium--redox chemistry and electrochromism in flexible devices. ChemSusChem 2010; 3:97-105. [PMID: 19924765 DOI: 10.1002/cssc.200900202] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
An electrochromic zwitterionic viologen, N,N'-bis(3-sulfonatopropyl)-4-4'-bipyridinium, has been used for the first time for doping poly (3,4-ethylenedioxythiopene) (PEDOT) films during electropolymerization. Slow and fast diffusional rates for the monomer at deposition potentials of +1.2 and +1.8 V, respectively yielded the viologen-doped PEDOT films with granular morphology and with dendrite-like shapes. The dual electrochrome formed at +1.8 V, showed enhanced coloration efficiency, larger electrochemical charge storage capacity, and superior redox activity in comparison to its analogue grown at +1.2 V, thus demonstrating the role of dendritic shapes in amplifying electrochromism. Flexible electrochromic devices fabricated with the viologen-doped PEDOT film grown at +1.8 V and Prussian blue with an ionic liquid-based gel electrolyte film showed reversible coloration between pale and dark purple with maximum coloration efficiency of 187 cm2C(-1) at lambda=693 nm. The diffusional impedance parameters and switching kinetics of the device showed the suitability of this dual electrochrome formed as a single layer for practical electrochromic cells.
Collapse
Affiliation(s)
- Shweta Bhandari
- National Physical Laboratory, Dr. K. S. Krishnan road, New Delhi-110012, India
| | | | | | | | | | | |
Collapse
|
24
|
Abstract
We report a simple method for the synthesis of Na(+) doped and stable zinc oxide quantum dots, using the quantum confinement atom method. An intense broad green photoluminescence (PL) was observed with a maximum located at approximately 535 nm when excited by UV radiation of 332 nm. The PL peak intensity is found to be highly dependent on the size of the quantum dots (QDs). Electron microscopy observation revealed that the radius of the QD was approximately 1 nm, which clearly indicated that the QDs are in the strong quantum confinement region (exciton Bohr radius, r(B), for bulk ZnO is 1.8 nm). Phase purity of ZnO and the presence of Na(+) was confirmed by x-ray diffraction (XRD) and atomic absorption spectroscopy (AAS), respectively. The results are well incremented by x-ray photoelectron spectroscopy (XPS) studies. Intentional ageing of QDs for several days under controlled experimental conditions such as temperature, relative humidity and pH etc, facilitated the formation of various nanostructures with a slight red shift in the PL peak position. Time resolved emission spectroscopy measurements indicated that PL decay time changes from 35 ns for QDs to 1660 micros for nanocrystals. The observed high-intensity and stable green PL emissions have been analyzed and thoroughly discussed.
Collapse
Affiliation(s)
- D Haranath
- National Physical Laboratory, Council of Scientific and Industrial Research, Dr K S Krishnan Road, New Delhi-110 012, India.
| | | | | | | | | |
Collapse
|
25
|
Bhandari S, Deepa M, Srivastava AK, Joshi AG, Kant R. Poly(3,4-ethylenedioxythiophene)−Multiwalled Carbon Nanotube Composite Films: Structure-Directed Amplified Electrochromic Response and Improved Redox Activity. J Phys Chem B 2009; 113:9416-28. [DOI: 10.1021/jp9012976] [Citation(s) in RCA: 96] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Shweta Bhandari
- National Physical Laboratory, Dr. K.S. Krishnan Road, New Delhi 110012, India, and Department of Chemistry, University of Delhi, New Delhi 110007, India
| | - Melepurath Deepa
- National Physical Laboratory, Dr. K.S. Krishnan Road, New Delhi 110012, India, and Department of Chemistry, University of Delhi, New Delhi 110007, India
| | - Avanish Kumar Srivastava
- National Physical Laboratory, Dr. K.S. Krishnan Road, New Delhi 110012, India, and Department of Chemistry, University of Delhi, New Delhi 110007, India
| | - Amish G. Joshi
- National Physical Laboratory, Dr. K.S. Krishnan Road, New Delhi 110012, India, and Department of Chemistry, University of Delhi, New Delhi 110007, India
| | - Rama Kant
- National Physical Laboratory, Dr. K.S. Krishnan Road, New Delhi 110012, India, and Department of Chemistry, University of Delhi, New Delhi 110007, India
| |
Collapse
|
26
|
Abstract
The spirometric pulmonary function tests (PFT) were studied in age-matched sugar factory workers who were exposed to sugarcane dust (n = 354) and normal healthy controls (n = 40) from the Western Maharashtra region of India. Anthropometric measurements were taken of both groups before the assessment of pulmonary function. Factory workers were grouped into two groups depending upon type of exposure to bagasse or sugarcane dust. The exposure groups were divided into a direct exposure group (those handling bagasse, n = 34) and an indirect exposure group (those not handling bagasse, n = 320). The spirometric PFT parameters studied were FVC (Forced Vital Capacity), FEV1 (Forced Expiratory Volume in first second), PEFR (Peak Expiratory Flow Rate), and MVV (Maximum Voluntary Ventilation). An examination of the percent of predicted values of all the parameters studied indicated that the values of all PFT parameters were significantly reduced in the direct exposure group as compared with control group. In indirect exposure group also showed reduced values that did not a reach significant level. We conclude from these findings that exposure to sugarcane dust (bagasse) and to other pollutants in a sugar factory is associated with lung dysfunction, which is more pronounced in the direct exposure group. A further study on a larger scale is essential to confirm our findings.
Collapse
Affiliation(s)
- S N Patil
- Department of Physiology, Krishna Institute of Medical Sciences, University Karad 415 110, Maharashtra, India.
| | | | | |
Collapse
|
27
|
|
28
|
Abraham P, Desai DC, Joshi AG. Gallstones in portal hypertension: is the liver or the portal hypertension responsible? J Assoc Physicians India 2002; 50:515-7. [PMID: 12164400] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/26/2023]
|
29
|
Joshi AG, Rege MS. Acute toxicity of some pesticides & a few inorganic salts to the mosquito fish Gambusia affinis (Baird & Girard). Indian J Exp Biol 1980; 18:435-7. [PMID: 7399617] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
|