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Ghosh T, Nandi S, Girigoswami A, Bhattacharyya SK, Ghosh SK, Mandal M, Ghorai UK, Banerji P, Das NC. Carbon Dots for Multiuse Platform: Intracellular pH Sensing and Complementary Intensified T1-T2 Dual Imaging Contrast Nanoprobes. ACS Biomater Sci Eng 2024; 10:1112-1127. [PMID: 38163852 DOI: 10.1021/acsbiomaterials.3c01389] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2024]
Abstract
Measurement of pH in living cells is a great and decisive factor for providing an early and accurate diagnosis factor. Along with this, the multimodal transverse and longitudinal relaxivity enhancement potentiality over single modality within a single platform in the magnetic resonance imaging (MRI) field is a very challenging issue for diagnostic purposes in the biomedical field of application. Therefore, this work aims to design a versatile platform by fabricating a novel nanoprobe through holmium- and manganese-ion doping in carbon quantum dots (Ho-Mn-CQDs), which can show nearly neutral intracellular pH sensing and MRI imaging at the same time. These manufactured Ho-Mn-CQDs acted as excellent pH sensors in the near-neutral range (4.01-8.01) with the linearity between 6.01 and 8.01, which could be useful for the intracellular pH-sensing capability. An innumerable number of carboxyl and amino groups are present on the surface of the prepared nanoprobe, making it an excellent candidate for pH sensing through fluorescence intensity quenching phenomena. Cellular uptake and cell viability experiments were also executed to affirm the intracellular accepting ability of Ho-Mn-CQDs. Furthermore, with this pH-sensing quality, these Ho-Mn-CQDs are also capable of acting as T1-T2 dual modal imaging contrast agents in comparison with pristine Ho-doped and Mn-doped CQDs. The Ho-Mn-CQDs showed an increment of r1 and r2 relaxivity values simultaneously compared with only the negative contrast agent, holmium in holmium-doped CQDs, and the positive contrast agent, manganese in manganese-doped CQDs. The above-mentioned observations elucidate that its tiny size, excitation dependence of fluorescence behavior, low cytotoxicity, and dual modal contrast imaging capability make it an ideal candidate for pH monitoring in the near-neutral range and also as a dual modal MRI imaging contrast enhancement nanoprobe at the same time.
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Affiliation(s)
- Trisita Ghosh
- Rubber Technology Centre, Indian Institute of Technology Kharagpur, Kharagpur 721302, India
| | - Suvendu Nandi
- School of Medical Science and Technology, Indian Institute of Technology Kharagpur, Kharagpur 721302, India
| | - Agnishwar Girigoswami
- Medical Bionanotechnology, Faculty of Allied Health Sciences, Chettinad Hospital and Research Institute (CHRI), Chettinad Academy of Research and Education (CARE), Kelambakkam, Chennai 603 103, India
| | | | - Suman Kumar Ghosh
- Rubber Technology Centre, Indian Institute of Technology Kharagpur, Kharagpur 721302, India
| | - Mahitosh Mandal
- School of Medical Science and Technology, Indian Institute of Technology Kharagpur, Kharagpur 721302, India
| | - Uttam Kumar Ghorai
- Department of Industrial Chemistry and Applied Chemistry, Ramakrishna Mission Vidyamandira, Howrah 711202, India
| | - Pallab Banerji
- Materials Science Centre, Indian Institute of Technology Kharagpur, Kharagpur 721302, India
| | - Narayan Chandra Das
- Rubber Technology Centre, Indian Institute of Technology Kharagpur, Kharagpur 721302, India
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Mitra K, Adalder A, Mandal S, Ghorai UK. Enhancing Electrochemical Reactivity with Magnetic Fields: Unraveling the Role of Magneto-Electrochemistry. Small Methods 2024:e2301132. [PMID: 38221715 DOI: 10.1002/smtd.202301132] [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: 08/25/2023] [Revised: 11/16/2023] [Indexed: 01/16/2024]
Abstract
Electrocatalysis performs a vital role in numerous energy transformation and repository mechanics, including power cells, Electric field-assisted catalysis, and batteries. It is crucial to investigate new methods to improve electrocatalytic performance if effective and long-lasting power systems are developed. The modulation of catalytic activity and selectivity by external magnetic fields over electrochemical processes has received a lot of interest lately. How the use of various magnetic fields in electrocatalysis has great promise for building effective and selective catalysts, opening the door for the advancement of sophisticated energy conversion is discussed. Furthermore, the challenges and possibilities of incorporating magnetic fields into electrocatalytic systems and suggestions for future research areas are discussed.
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Affiliation(s)
- Koushik Mitra
- Department of Industrial Chemistry and Applied Chemistry, Swami Vivekananda Research Centre, Ramakrishna Mission Vidyamandira, Belur Math, Howrah, 711202, India
| | - Ashadul Adalder
- Department of Industrial Chemistry and Applied Chemistry, Swami Vivekananda Research Centre, Ramakrishna Mission Vidyamandira, Belur Math, Howrah, 711202, India
| | - Sumit Mandal
- Department of Physics, Vidyasagar College, Kolkata, 700006, India
| | - Uttam Kumar Ghorai
- Department of Industrial Chemistry and Applied Chemistry, Swami Vivekananda Research Centre, Ramakrishna Mission Vidyamandira, Belur Math, Howrah, 711202, India
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Kumar P, Parashar M, Chauhan K, Chakraborty N, Sarkar S, Chandra A, Das NS, Chattopadhyay KK, Ghoari A, Adalder A, Ghorai UK, Saini S, Agarwal D, Ghosh S, Srivastava P, Banerjee D. Significant enhancement in the cold emission characteristics of chemically synthesized super-hydrophobic zinc oxide rods by nickel doping. Nanoscale Adv 2023; 5:6944-6957. [PMID: 38059027 PMCID: PMC10696928 DOI: 10.1039/d3na00776f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/13/2023] [Accepted: 10/28/2023] [Indexed: 12/08/2023]
Abstract
The current article presents a huge enhancement in the field emission characteristics of zinc oxide (ZnO) micro/nanorods by nickel doping. The synthesis of pure and nickel-doped zinc oxide (ZnO) micro/nanorods was done by a simple low-temperature chemical method. Both the as-prepared pure and doped samples were analyzed by X-ray diffraction and electron microscopy to confirm the proper phase formation and the developed microstructure. UV-vis transmittance spectra helped in determining the band gap of the samples. Fourier-Transform Infrared Spectroscopy (FTIR) spectra showed the different bonds present in the sample, whereas X-ray Photoelectron Spectroscopy (XPS) confirmed the presence of nickel in the doped sample. Photoluminescence (PL) spectra showed that after doping, the band-to-band transition was affected, whereas defect-induced transition had increased significantly. After the nickel doping, contact angle measurement revealed a significant decrease in the sample's surface energy, leading to a remarkably high water contact angle (within the superhydrophobic region). Simulation through ANSYS suggested that the doped sample has the potential to function as an efficient cold emitter, which was also verified experimentally. The cold emission characteristics of the doped sample showed a significant improvement, with the turn-on field (corresponding to J = 1 μA cm-2) reduced from 5.34 to 2.84 V μm-1. The enhancement factor for the doped sample reached 3426, approximately 1.5 times higher compared to pure ZnO. Efforts have been made to explain the results, given the favorable band bending as well as the increased number of effective emission sites.
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Affiliation(s)
- P Kumar
- Thin Film and Nanotechnology Laboratory, Faculty of Engineering and Computing Sciences, Teerthanker Mahaveer University Moradabad UP 244001 India
| | - M Parashar
- Thin Film and Nanotechnology Laboratory, Faculty of Engineering and Computing Sciences, Teerthanker Mahaveer University Moradabad UP 244001 India
| | - K Chauhan
- Thin Film and Nanotechnology Laboratory, Faculty of Engineering and Computing Sciences, Teerthanker Mahaveer University Moradabad UP 244001 India
| | - N Chakraborty
- Thin Film and Nanoscience Laboratory, Department of Physics, Jadavpur University Kolkata West Bengal 700032 India
| | - S Sarkar
- Thin Film and Nanoscience Laboratory, Department of Physics, Jadavpur University Kolkata West Bengal 700032 India
| | - A Chandra
- Thin Film and Nanoscience Laboratory, Department of Physics, Jadavpur University Kolkata West Bengal 700032 India
| | - N S Das
- Department of Basic Science and Humanities, Techno International Batanagar Maheshtala Kolkata 700141 India
| | - K K Chattopadhyay
- Thin Film and Nanoscience Laboratory, Department of Physics, Jadavpur University Kolkata West Bengal 700032 India
| | - A Ghoari
- Department of Industrial Chemistry, Ramakrishna Mission Vidyamandira Belur Math Howrah-711202 India
| | - A Adalder
- Department of Industrial Chemistry, Ramakrishna Mission Vidyamandira Belur Math Howrah-711202 India
| | - U K Ghorai
- Department of Industrial Chemistry, Ramakrishna Mission Vidyamandira Belur Math Howrah-711202 India
| | - S Saini
- Department of Physics, Indian Institute of Technology Hauz Khas South West Delhi 110016 India
| | - D Agarwal
- Department of Physics, Indian Institute of Technology Hauz Khas South West Delhi 110016 India
| | - S Ghosh
- Department of Physics, Indian Institute of Technology Hauz Khas South West Delhi 110016 India
| | - P Srivastava
- Department of Physics, Indian Institute of Technology Hauz Khas South West Delhi 110016 India
| | - D Banerjee
- Thin Film and Nanotechnology Laboratory, Faculty of Engineering and Computing Sciences, Teerthanker Mahaveer University Moradabad UP 244001 India
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Paul S, Sarkar S, Dolui D, Sarkar D, Robert M, Ghorai UK. 1D/2D interface engineering of a CoPc-C 3N 4 heterostructure for boosting the nitrogen reduction reaction to NH 3. Dalton Trans 2023; 52:15360-15364. [PMID: 37740280 DOI: 10.1039/d3dt01790g] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/24/2023]
Abstract
Herein, we demonstrate the construction of a 1D/2D heterostructure of cobalt phthalocyanine (CoPc)-carbon nitride (C3N4) for electrochemical N2 reduction to NH3. Improved performance originates from the higher exposure of active surface sites. The electrochemical NRR performance showed an NH3 formation rate of 423.8 μg h-1 mgcat-1, a high faradaic efficiency (FE) of 33%, and stability for 20 h. This study provides a new strategy for designing a highly efficient 1D/2D electrocatalytic system for ammonia synthesis.
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Affiliation(s)
- Sourav Paul
- Department of Industrial Chemistry and Applied Chemistry, Swami Vivekananda Research Center, Ramakrishna Mission Vidyamandira, Belur Math, Howrah-711202, West Bengal, India.
| | - Sougata Sarkar
- Department of Industrial Chemistry and Applied Chemistry, Swami Vivekananda Research Center, Ramakrishna Mission Vidyamandira, Belur Math, Howrah-711202, West Bengal, India.
| | - Dependu Dolui
- Université Paris Cité, Laboratoire d'Electrochimie Moléculaire, CNRS, F-75006 Paris, France
| | - Debashrita Sarkar
- Université Paris Cité, Laboratoire d'Electrochimie Moléculaire, CNRS, F-75006 Paris, France
| | - Marc Robert
- Université Paris Cité, Laboratoire d'Electrochimie Moléculaire, CNRS, F-75006 Paris, France
- Institut Universitaire de France (IUF), F-75005 Paris, France
| | - Uttam Kumar Ghorai
- Department of Industrial Chemistry and Applied Chemistry, Swami Vivekananda Research Center, Ramakrishna Mission Vidyamandira, Belur Math, Howrah-711202, West Bengal, India.
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Adalder A, Paul S, Ghorai B, Kapse S, Thapa R, Nagendra A, Ghorai UK. Selective Electrocatalytic Oxidation of Nitrogen to Nitric Acid Using Manganese Phthalocyanine. ACS Appl Mater Interfaces 2023. [PMID: 37449852 DOI: 10.1021/acsami.3c01847] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/18/2023]
Abstract
Ammonia is produced through the energy-intensive Haber-Bosch process, which undergoes catalytic oxidation for the production of commercial nitric acid by the senescent Ostwald process. The two energy-intensive industrial processes demand for process sustainability. Hence, single-step electrocatalysis offers a promising approach toward a more environmentally friendly solution. Herein, we report a 10-electron pathway associated one-step electrochemical dinitrogen oxidation reaction (N2OR) to nitric acid by manganese phthalocyanine (MnPc) hollow nano-structures under ambient conditions. The catalyst delivers a nitric acid yield of 513.2 μmol h-1 gcat-1 with 33.9% Faradaic efficiency @ 2.1 V versus reversible hydrogen electrode. The excellent N2OR performances are achieved due to the specific-selectivity, presence of greater number of exposed active sites, recyclability, and long period stability. The extended X-ray absorption fine structure confirms that Mn atoms are coordinated to the pyrrolic and pyridinic nitrogen via Mn-N4 coordination. Density functional theory-based theoretical calculations confirm that the Mn-N4 site of MnPc is the main active center for N2OR, which suppresses the oxygen evolution reaction. This work provides a new arena about the successful example of one step nitric acid production utilizing a Mn-N4 active site-based metal phthalocyanine electrocatalyst by dinitrogen oxidation for the development of a carbon-neutral sustainable society.
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Affiliation(s)
- Ashadul Adalder
- Department of Industrial Chemistry & Applied Chemistry, Swami Vivekananda Research Centre, Ramakrishna Mission Vidyamandira, Belur Math, Howrah 711202, India
| | - Sourav Paul
- Department of Industrial Chemistry & Applied Chemistry, Swami Vivekananda Research Centre, Ramakrishna Mission Vidyamandira, Belur Math, Howrah 711202, India
| | - Biswajit Ghorai
- Department of Industrial Chemistry & Applied Chemistry, Swami Vivekananda Research Centre, Ramakrishna Mission Vidyamandira, Belur Math, Howrah 711202, India
| | - Samadhan Kapse
- Department of Physics, SRM University─AP, Amaravati, Andhra Pradesh 522240, India
| | - Ranjit Thapa
- Department of Physics, SRM University─AP, Amaravati, Andhra Pradesh 522240, India
| | - Abharana Nagendra
- Atomic & Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - Uttam Kumar Ghorai
- Department of Industrial Chemistry & Applied Chemistry, Swami Vivekananda Research Centre, Ramakrishna Mission Vidyamandira, Belur Math, Howrah 711202, India
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Murmu S, Paul S, Santra A, Robert M, Ghorai UK. Graphene wrapped nickel phthalocyanine nanohybrid: Efficient electrocatalyst for nitrogen reduction reaction. Catal Today 2022. [DOI: 10.1016/j.cattod.2022.10.020] [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: 11/24/2022]
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Mukherjee J, Adalder A, Mukherjee N, Ghorai UK. Solvothermal synthesis of α–CuPc nanostructures for electrochemical nitrogen fixation under ambient conditions. Catal Today 2022. [DOI: 10.1016/j.cattod.2022.09.011] [Citation(s) in RCA: 1] [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: 11/25/2022]
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Singh S, Kanika, Kedawat G, Park JH, Ghorai B, Ghorai UK, Upadhyay C, Kaipparettu BA, Gupta BK. Frequency upconversion, paramagnetic behavior and biocompatibility of Gd2O3:Er3+/Yb3+ nanorods. Journal of Photochemistry and Photobiology 2021. [DOI: 10.1016/j.jpap.2021.100081] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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Ghorai UK, Paul S, Ghorai B, Adalder A, Kapse S, Thapa R, Nagendra A, Gain A. Scalable Production of Cobalt Phthalocyanine Nanotubes: Efficient and Robust Hollow Electrocatalyst for Ammonia Synthesis at Room Temperature. ACS Nano 2021; 15:5230-5239. [PMID: 33646739 DOI: 10.1021/acsnano.0c10596] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Electrocatalytic ammonia (NH3) synthesis through the nitrogen reduction reaction (NRR) under ambient conditions presents a promising alternative to the famous century-old Haber-Bosch process. Designing and developing a high-performance electrocatalyst is a compelling necessity for electrochemical NRR. Specific transition metal based nanostructured catalysts are potential candidates for this purpose owing to their attributes such as higher actives sites, specificity as well as selectivity and electron transfer, etc. However, due to the lack of a well-organized morphology, lower activity, selectivity, and stability of the electrocatalysts make them ineffective at producing a high NH3 yield rate and Faradaic efficiency (FE) for further development. In this work, stable β-cobalt phthalocyanine (CoPc) nanotubes (NTs) have been synthesized by a scalable solvothermal method for electrochemical NRR. The chemically synthesized CoPc NTs show excellent electrochemical NRR due to high specific area, greater number of exposed active sites, and specific selectivity of the catalyst. As a result, CoPc NTs produced a higher NH3 yield of 107.9 μg h-1 mg-1cat and FE of 27.7% in 0.1 M HCl at -0.3 V vs RHE. The density functional theory calculations confirm that the Co center in CoPc is the main active site responsible for electrochemical NRR. This work demonstrates the development of hollow nanostructured electrocatalysts in large scale for N2 fixation to NH3.
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Affiliation(s)
- Uttam Kumar Ghorai
- Department of Industrial Chemistry & Applied Chemistry, Swami Vivekananda Research Centre, Ramakrishna Mission Vidyamandira, Belur Math, Howrah 711202, India
| | - Sourav Paul
- Department of Industrial Chemistry & Applied Chemistry, Swami Vivekananda Research Centre, Ramakrishna Mission Vidyamandira, Belur Math, Howrah 711202, India
| | - Biswajit Ghorai
- Department of Industrial Chemistry & Applied Chemistry, Swami Vivekananda Research Centre, Ramakrishna Mission Vidyamandira, Belur Math, Howrah 711202, India
| | - Ashadul Adalder
- Department of Industrial Chemistry & Applied Chemistry, Swami Vivekananda Research Centre, Ramakrishna Mission Vidyamandira, Belur Math, Howrah 711202, India
| | - Samadhan Kapse
- Department of Physics, SRM University-AP, Amaravati 522240, Andhra Pradesh, India
| | - Ranjit Thapa
- Department of Physics, SRM University-AP, Amaravati 522240, Andhra Pradesh, India
| | - Abharana Nagendra
- Atomic & Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - Amal Gain
- Department of Industrial Chemistry & Applied Chemistry, Swami Vivekananda Research Centre, Ramakrishna Mission Vidyamandira, Belur Math, Howrah 711202, India
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Das S, Ghorai UK, Dey R, Ghosh CK, Pal M. Effect of annealing on the defect-mediated blue phosphorescence in ZnO nanocrystals. RSC Adv 2020; 11:335-348. [PMID: 35423015 PMCID: PMC8690963 DOI: 10.1039/d0ra04766j] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2020] [Accepted: 12/13/2020] [Indexed: 11/21/2022] Open
Abstract
Recently, UV/NUV excitable RGB phosphors with precisely tunable PL emission properties have been in high demand for their suitability in the fabrication of white LEDs. In this paper, we report to have tuned the PL intensity, shade, and color temperature of the defect-mediated blue phosphorescence of ZnO nanopowders by systematic annealing at different temperatures. The ZnO nanopowder was prepared by a facile and cost-effective aqueous solution-precipitation method. The as-synthesized nanopowder was annealed at different temperatures ranging from 150 °C to 850 °C and all these samples were characterized by XRD, FESEM, EDX, BET, Raman spectroscopy, and UV-Vis spectroscopy to have insight into their microstructural, compositional, and band-structure details. Optical studies of the samples were conducted by PL and τ-PL spectroscopy. Color coordinates of the samples were obtained from the CIE plots derived from the PL spectra. The CIE coordinates were further used to calculate the CCT values of the samples. τ-PL spectroscopy was carried out to measure the life-time of the photogenerated electrons. PL studies of the samples revealed that the blue emissions have red, yellow, and blue components originating from crystalline point defects, viz. zinc interstitial (Zni), and oxygen interstitial (Oi). Annealing at different temperatures triggered changes in the defect concentrations leading to the corresponding changes in the intensity, shade, and color temperature of the blue phosphorescence.
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Affiliation(s)
- Sagnik Das
- CSIR-Central Glass and Ceramic Research Institute Kolkata-700032 India
| | | | - Rajib Dey
- Jadavpur University Kolkata-700032 India
| | | | - Mrinal Pal
- CSIR-Central Glass and Ceramic Research Institute Kolkata-700032 India
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Singh S, Ghorai B, Kumar Yadav P, Kumar Ghorai U, Upadhyay C, Gupta BK. Probing into Bifunctional Luminomagnetic Upconverting Nanorods for External Magnetic Tracking Applications. ChemistrySelect 2020. [DOI: 10.1002/slct.202003159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Satbir Singh
- Photonic Materials Metrology Sub Division, Advanced Materials and Device Metrology Division CSIR-National Physical Laboratory, Dr. K. S. Krishnan Marg New Delhi 110012 India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad 201002 India
| | - Biswajit Ghorai
- Department of Industrial Chemistry & Applied Chemistry, Swami Vivekananda Research centre Ramakrishna Mission Vidyamandira, Belur Math Howrah 711202 India
| | - Pramod Kumar Yadav
- School of Materials Science and Technology Indian Institute of Technology (Banaras Hindu University) Varanasi 221005 India
| | - Uttam Kumar Ghorai
- Department of Industrial Chemistry & Applied Chemistry, Swami Vivekananda Research centre Ramakrishna Mission Vidyamandira, Belur Math Howrah 711202 India
| | - Chandan Upadhyay
- School of Materials Science and Technology Indian Institute of Technology (Banaras Hindu University) Varanasi 221005 India
| | - Bipin Kumar Gupta
- Photonic Materials Metrology Sub Division, Advanced Materials and Device Metrology Division CSIR-National Physical Laboratory, Dr. K. S. Krishnan Marg New Delhi 110012 India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad 201002 India
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Mondal T, Haldar D, Ghosh A, Ghorai UK, Saha SK. A MOF functionalized with CdTe quantum dots as an efficient white light emitting phosphor material for applications in displays. NEW J CHEM 2020. [DOI: 10.1039/c9nj04304g] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Cysteamine capped CdTe QD functionalized CP1 as a white light emitter in LED applications.
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Affiliation(s)
- Tuhina Mondal
- School of Materials Sciences
- Indian Association for the Cultivation of Science
- Kolkata – 700032
- India
| | - Dhrubaa Haldar
- School of Materials Sciences
- Indian Association for the Cultivation of Science
- Kolkata – 700032
- India
| | - Arnab Ghosh
- School of Materials Sciences
- Indian Association for the Cultivation of Science
- Kolkata – 700032
- India
| | - Uttam Kumar Ghorai
- Department of Industrial Chemistry and Applied Chemistry
- Swami Vivekananda Research Centre
- Ramakrishna Mission Vidyamandira
- Howrah-711202
- India
| | - Shyamal K. Saha
- School of Materials Sciences
- Indian Association for the Cultivation of Science
- Kolkata – 700032
- India
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Chatterjee R, Saha S, Panigrahi K, Ghorai UK, Das GC, Chattopadhyay KK. Blue Emitting BaAl 2O 4:Ce 3+ Nanophosphors with High Color Purity and Brightness for White LEDs. Microsc Microanal 2019; 25:1466-1470. [PMID: 31556362 DOI: 10.1017/s1431927619014958] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
In this work, strongly blue emitting Ce3+-activated BaAl2O4 nanophosphors were successfully synthesized by a sol-gel technique. The crystal structure, morphology, and microstructure of the nanophosphors have been studied by X-ray powder diffraction, field emission scanning electron microscopy, and high-resolution transmission electron microscopy. The photoluminescence spectra show the impact of concentration variation of Ce3+ on the photoluminescence emission of the phosphor. These nanophosphors display intense blue emission peaking at 422 nm generated by the Ce3+ 5d → 4f transition under 350 nm excitation. Our results reveal that this nanophosphor has the capability to take part in the emergent domain of solid-state lighting and field-emission display devices.
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Affiliation(s)
- Rituparna Chatterjee
- School of Materials Science and Nanotechnology, Jadavpur University, Kolkata 700032, India
| | - Subhajit Saha
- School of Materials Science and Nanotechnology, Jadavpur University, Kolkata 700032, India
| | - Karamjyoti Panigrahi
- School of Materials Science and Nanotechnology, Jadavpur University, Kolkata 700032, India
| | - Uttam Kumar Ghorai
- Department of Industrial Chemistry, Swami Vivekananda Research Centre, Ramakrishna Mission Vidyamandira, Belur Math, Howrah 711202, India
| | - Gopes Chandra Das
- School of Materials Science and Nanotechnology, Jadavpur University, Kolkata 700032, India
| | - Kalyan Kumar Chattopadhyay
- School of Materials Science and Nanotechnology, Jadavpur University, Kolkata 700032, India
- Department of Physics, Jadavpur University, Kolkata 700032, India
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Das A, Saha S, Panigrahi K, Ghorai UK, Chattopadhyay KK. Enhanced Photoluminescence Properties of Low-Dimensional Eu 3+-Activated Y 4Al 2O 9 Phosphor Compared to Bulk for Solid-State Lighting Applications and Latent Fingerprint Detection-Based Forensic Applications. Microsc Microanal 2019; 25:1422-1430. [PMID: 31025617 DOI: 10.1017/s143192761900028x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
In recent years, nanoscale phosphors have become vital in optoelectronic applications and to understand the improved performance of nanophosphors over bulk material, detailed investigation is essential. Herein, trivalent europium-activated Y4Al2O9 phosphors were developed by solid-state reaction and solvothermal reaction methods and their performance as a function of their dimension was studied for various applications. Under 394 nm optical excitation, the photoluminescence (PL) emission, excited state lifetime of the nanophosphor, exhibits greater performance than its bulk counterpart. The homogeneous spherical structure of the nanophosphors as compared with solid lumps of bulk phosphors is the basis for almost 40% of the enhancement in nanophosphors' intense red emission compared to the bulk. Moreover, the thermal stability of the nanophosphor is much better than the bulk phosphor, which clearly indicates a key advantage of nanophosphor. The superior performance of Eu3+-doped Y4Al2O9 nanophosphors over their bulk counterparts has been demonstrated for industrial phosphor-converted light-emitting diodes and visualization of latent fingerprint.
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Affiliation(s)
- Antika Das
- School of Materials Science and Nanotechnology, Jadavpur University, Kolkata-700032, West Bengal, India
| | - Subhajit Saha
- School of Materials Science and Nanotechnology, Jadavpur University, Kolkata-700032, West Bengal, India
| | - Karamjyoti Panigrahi
- School of Materials Science and Nanotechnology, Jadavpur University, Kolkata-700032, West Bengal, India
| | - Uttam Kumar Ghorai
- Department of Industrial Chemistry and Applied Chemistry, Swami Vivekananda Research Centre, Ramakrishna Mission Vidyamandira, Belurmath, Howrah-711202, West Bengal, India
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15
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Mukherjee A, Adak MK, Upadhyay S, Khatun J, Dhak P, Khawas S, Ghorai UK, Dhak D. Efficient Fluoride Removal and Dye Degradation of Contaminated Water Using Fe/Al/Ti Oxide Nanocomposite. ACS Omega 2019; 4:9686-9696. [PMID: 31460059 PMCID: PMC6649016 DOI: 10.1021/acsomega.9b00252] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/28/2019] [Accepted: 03/27/2019] [Indexed: 06/10/2023]
Abstract
The trimetallic Fe/Al/Ti (1:1:1) nanocomposite (FAT), synthesized by an adaptable tuned chemical route, offers a new approach for water treatment, for example, the de-fluoridation and photodegradation soluble dye methylene blue (MB) at pH 7. FAT acted as a good fluoride scavenger in the presence of other co-ions and within a widespread pH range (pH 2-11). The photodegradation efficiencies were >90% for different concentrations of MB solutions. The characterization of FAT includes thermogravimetric analysis, X-ray diffraction, Fourier transform-infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, and ζ-potential analysis. Furthermore, the regeneration efficiencies of both the water treatments were checked, where the removal efficiency was not hampered significantly even after five batches. Spectroscopic techniques were adopted to perform the kinetic studies and to propose the probable mechanistic paths.
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Affiliation(s)
- Arnab Mukherjee
- Nanomaterials
Research Lab, Department of Chemistry, Sidho-Kanho-Birsha
University, Purulia 723104, India
| | - Mrinal K. Adak
- Nanomaterials
Research Lab, Department of Chemistry, Sidho-Kanho-Birsha
University, Purulia 723104, India
| | - Sudipta Upadhyay
- Nanomaterials
Research Lab, Department of Chemistry, Sidho-Kanho-Birsha
University, Purulia 723104, India
| | - Julekha Khatun
- Nanomaterials
Research Lab, Department of Chemistry, Sidho-Kanho-Birsha
University, Purulia 723104, India
| | - Prasanta Dhak
- Department
of Chemistry, Techno India University, Kolkata 700091, India
| | - Sadhana Khawas
- Nanomaterials
Research Lab, Department of Chemistry, Sidho-Kanho-Birsha
University, Purulia 723104, India
| | - Uttam Kumar Ghorai
- Department
of Industrial Chemistry, Ramakrishna Mission
Vidyamandira, Belur Math, Howrah 711202, India
| | - Debasis Dhak
- Nanomaterials
Research Lab, Department of Chemistry, Sidho-Kanho-Birsha
University, Purulia 723104, India
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16
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Mondal TK, Mondal S, Ghorai UK, Saha SK. White light emitting lanthanide based carbon quantum dots as toxic Cr (VI) and pH sensor. J Colloid Interface Sci 2019; 553:177-185. [PMID: 31202054 DOI: 10.1016/j.jcis.2019.06.009] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2019] [Revised: 05/30/2019] [Accepted: 06/04/2019] [Indexed: 12/21/2022]
Abstract
Although, great attention is paid to synthesize fluorescent carbon quantum dots (CQDs) for versatile applications, the field remains still attractive to achieve white light using these nano materials. In the present work, CQDs are synthesized from citric acid and lanthanide ions viz. Europium (Eu) and Terbium (Tb) are doped in CQD moiety to explore superior optical response for multifunctional applications. By proper tuning of excitation wavelength, perfect white light with Commission Internationale de l'Elcairage (CIE) index (0.345, 0.344) is obtained using these Europium Terbium co-doped CQDs (Eu-Tb-CQD). The observed photoluminescence of white light emitting lanthanide based CQD is pH dependent and will be used as a visual pH sensor. These luminescent Eu and Tb co-doped CQDs are also very useful to detect toxic Cr (VI) with excellent selectivity and sensitivity as compared to pure CQDs. It shows high quenching efficiency (∼95%) in presence of only 160 µM Cr(VI). The selectivity and lower detection limit are also obtained as ∼80% and 0.175 µM respectively.
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Affiliation(s)
- Tapas Kumar Mondal
- School of Materials Sciences, Indian Association for the Cultivation of Science Jadavpur, Kolkata 700032, India
| | - Supriya Mondal
- School of Materials Sciences, Indian Association for the Cultivation of Science Jadavpur, Kolkata 700032, India
| | - Uttam Kumar Ghorai
- Department of Industrial Chemistry and Applied Chemistry, Swami Vivekananda Research Center, Ramakrishna Mission Vidyamandira, Belur Math, Howrah 711202, India
| | - Shyamal K Saha
- School of Materials Sciences, Indian Association for the Cultivation of Science Jadavpur, Kolkata 700032, India.
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17
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Pradhan B, Mushtaq A, Roy D, Sain S, Das B, Ghorai UK, Pal SK, Acharya S. Postsynthesis Spontaneous Coalescence of Mixed-Halide Perovskite Nanocubes into Phase-Stable Single-Crystalline Uniform Luminescent Nanowires. J Phys Chem Lett 2019; 10:1805-1812. [PMID: 30929427 DOI: 10.1021/acs.jpclett.9b00832] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
All inorganic mixed-halide perovskite, CsPb(Br xI1- x)3 (0 ≤ x ≤ 1), nanocrystals possess tunable photoluminescence with high quantum yield in the visible window. However, the photoluminescence degrades rapidly with postsynthetic aging due to the spontaneous ion separation and phase instability. Here we show that the postsynthetic aging of CsPb(Br xI1- x)3 nanocubes spontaneously forms highly uniform single-crystalline nanowires with a diameter of 9 ± 0.5 nm and length of up to several micrometers. The nanowires show bright photoluminescence with an absolute photoluminescence quantum yield of 41%. Rietveld refinement identifies the stable orthorhombic phase of the nanowires, implying a phase transition from the cubic crystallographic phase of the nanocubes during the morphology evolution. Transient absorption spectroscopy reveals a faster excited-state decay dynamic with a large exciton delocalization length in 1D nanowires. Our findings elucidate the insights into the postsynthesis morphology evolution of mixed-halide perovskite nanocrystals leading to luminescent nanowires with excellent crystal phase stability for potential optoelectronic applications.
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Affiliation(s)
| | - Aamir Mushtaq
- School of Basic Sciences and Advanced Material Research Center , Indian Institute of Technology Mandi , Kamand , Himachal Pradesh 175005 , India
| | | | | | | | - Uttam Kumar Ghorai
- Department of Industrial & Applied Chemistry, Swami Vivekananda Research Center , Ramakrishna Mission Vidyamandira , Belur Math, Howrah , West Bengal 711202 , India
| | - Suman Kalyan Pal
- School of Basic Sciences and Advanced Material Research Center , Indian Institute of Technology Mandi , Kamand , Himachal Pradesh 175005 , India
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18
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Sukul PP, Mahata MK, Ghorai UK, Kumar K. Crystal phase induced upconversion enhancement in Er 3+/Yb 3+ doped SrTiO 3 ceramic and its temperature sensing studies. Spectrochim Acta A Mol Biomol Spectrosc 2019; 212:78-87. [PMID: 30616166 DOI: 10.1016/j.saa.2018.12.039] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2018] [Revised: 12/18/2018] [Accepted: 12/20/2018] [Indexed: 06/09/2023]
Abstract
Through doping of Er3+/Yb3+ ions the SrTiO3 perovskite ceramic is turned into an optically active material keeping its ferroelectric property intact. A huge enhancement of around 20 times in upconversion (UC) emission intensity is observed due to the transformation of cubic crystal structure to tetragonal phase. The intensity ratio of green to red band is found too high to neglect the contribution from the red emission band, which is not observed normally in such type of relatively moderate phonon frequency materials containing Yb3+/Er3+ ions. The change in emission intensity is reflected in the decay time measurement. Optical temperature sensing behavior based on FIR technique also has been discussed for Er3+/Yb3+ doped SrTiO3 ceramic.
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Affiliation(s)
- Prasenjit Prasad Sukul
- Optical Materials & Bio-imaging Research Laboratory, Department of Applied Physics, Indian Institute of Technology (Indian School of Mines), Dhanbad 826004, India.
| | - Manoj Kumar Mahata
- Optical Materials & Bio-imaging Research Laboratory, Department of Applied Physics, Indian Institute of Technology (Indian School of Mines), Dhanbad 826004, India
| | - Uttam Kumar Ghorai
- Department of Industrial Chemistry and Applied Chemistry, Swami Vivekananda Research Center, Ramakrishna Mission Vidyamandira, Belurmath, Howrah 711202, India
| | - Kaushal Kumar
- Optical Materials & Bio-imaging Research Laboratory, Department of Applied Physics, Indian Institute of Technology (Indian School of Mines), Dhanbad 826004, India
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19
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Sinha S, Chowdhury B, Ghorai UK, Ghosh P. Multitasking behaviour of a small organic compound: solid state bright white-light emission, mechanochromism and ratiometric sensing of Al(iii) and pyrophosphate. Chem Commun (Camb) 2019; 55:5127-5130. [DOI: 10.1039/c8cc10258a] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Solid state bright white-light emission, mechanochromism and ratiometric fluorescence sensing of Al3+ and pyrophosphate by a single organic molecule are demonstrated.
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Affiliation(s)
- Sanghamitra Sinha
- School of Chemical Sciences
- Indian Association for the Cultivation of Science
- Kolkata
- India
| | - Bijit Chowdhury
- School of Chemical Sciences
- Indian Association for the Cultivation of Science
- Kolkata
- India
| | - Uttam Kumar Ghorai
- Department of Industrial Chemistry and Applied Chemistry
- Ramakrishna Mission Vidyamandira & Swami Vivekananda Research Center
- Belur Math
- India
| | - Pradyut Ghosh
- School of Chemical Sciences
- Indian Association for the Cultivation of Science
- Kolkata
- India
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20
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Hota P, Bose S, Dinda D, Das P, Ghorai UK, Bag S, Mondal S, Saha SK. Nickel-Doped Silver Sulfide: An Efficient Air-Stable Electrocatalyst for Hydrogen Evolution from Neutral Water. ACS Omega 2018; 3:17070-17076. [PMID: 31458326 PMCID: PMC6644178 DOI: 10.1021/acsomega.8b02223] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2018] [Accepted: 11/26/2018] [Indexed: 05/19/2023]
Abstract
A low-cost, platinum-free electrocatalyst for hydrogen (H2) generation via the water splitting reaction holds great promise to meet the demand of clean and sustainable energy sources. Recent studies are mainly concerned with semiconducting materials like sulfides, selenides, and phosphides of different transition metals as electrocatalysts. Doping of the transition metals within the host matrix is a good strategy to improve the electrocatalytic activity of the host material. However, this activity largely depends on the nature of the dopant metal and its host matrix as well. To exploit this idea, here, in the present work, we have synthesized semiconducting Ag2S nanoparticles and successfully doped them with different transition metals like Mn, Fe, Co, and Ni to study their electrocatalytic activity for the hydrogen evolution reaction from neutral water (pH = 7). Among the systems doped with these transition metals, the Ni-doped Ag2S (Ni-Ag2S) system shows a very low overpotential (50 mV) with high catalytic current in neutral water. The trend in electrocatalytic activity of different transition metals has also been explained. The Ni-Ag2S system also shows very good stability in ambient atmosphere over a long period of time and suffers no catalytic degradation in the presence of oxygen. Structural characterizations are carried out using X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy, and energy-dispersive X-ray spectroscopy to establish the phase purity and morphology of the materials.
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Affiliation(s)
- Poulami Hota
- Department
of Materials Science and Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Saptasree Bose
- Department
of Materials Science and Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Diptiman Dinda
- Department
of Materials Science and Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Purusottom Das
- Department
of Materials Science and Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Uttam Kumar Ghorai
- Department
of Industrial Chemistry and Applied Chemistry, Ramakrishna Mission Vidyamandira and Swami Vivekananda Research Center, Belur Math, Howrah 711202, India
| | - Shekhar Bag
- Department
of Materials Science and Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Soumyadip Mondal
- Department
of Industrial Chemistry and Applied Chemistry, Ramakrishna Mission Vidyamandira and Swami Vivekananda Research Center, Belur Math, Howrah 711202, India
| | - Shyamal K. Saha
- Department
of Materials Science and Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
- E-mail:
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21
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Santra D, Mandal S, Santra A, Ghorai UK. Cost-Effective, Wireless, Portable Device for Estimation of Hexavalent Chromium, Fluoride, and Iron in Drinking Water. Anal Chem 2018; 90:12815-12823. [PMID: 30281277 DOI: 10.1021/acs.analchem.8b03337] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The quality of drinking water often remains unknown to people because of the inadequacy of cost-effective testing systems that can be used in the field. Major portable instruments for water-quality analysis include ion-selective electrodes (ISE) or colorimeters. These are low-cost devices, but in the case of multiple-analyte detection, such as that of hexavalent chromium (Cr), fluoride (F-), and iron (Fe), with a single instrument, no portable systems are available, to the authors' knowledge. In this paper, we demonstrate the use of a low-cost (approximate price of INR 1500 or US$20), portable colorimetric system that can be operated with Android smartphones wirelessly to estimate the contamination levels of Cr(VI), F-, and Fe in drinking water. This system also generates absorption spectra by recording the absorbance of the analyte using a light-dependent-resistor (LDR) sensor. An Android-application software named Spectruino was developed to calculate the concentrations of the analytes. We strongly believe that this cost-effective, portable system will be very useful in improving human health by ensuring drinking-water quality throughout India.
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Affiliation(s)
- Debmalya Santra
- Department of Industrial Chemistry and Applied Chemistry, Swami Vivekananda Research Center , Ramakrishna Mission Vidyamandira , Belur Math, Howrah 711202 , India
| | - Subhradeep Mandal
- Department of Industrial Chemistry and Applied Chemistry, Swami Vivekananda Research Center , Ramakrishna Mission Vidyamandira , Belur Math, Howrah 711202 , India
| | - Angshuman Santra
- Department of Industrial Chemistry and Applied Chemistry, Swami Vivekananda Research Center , Ramakrishna Mission Vidyamandira , Belur Math, Howrah 711202 , India
| | - Uttam Kumar Ghorai
- Department of Industrial Chemistry and Applied Chemistry, Swami Vivekananda Research Center , Ramakrishna Mission Vidyamandira , Belur Math, Howrah 711202 , India
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22
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Samanta SK, Kumar GS, Ghorai UK, Scherf U, Acharya S, Bhattacharya S. Synthesis of High Molecular Weight 1,4-Polynaphthalene for Solution-Processed True Color Blue Light Emitting Diode. Macromolecules 2018. [DOI: 10.1021/acs.macromol.8b01057] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [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)
- Suman Kalyan Samanta
- School of Applied and Interdisciplinary Sciences, Indian Association for the Cultivation of Science, Kolkata 700032, India
| | - Gundam Sandeep Kumar
- School of Applied and Interdisciplinary Sciences, Indian Association for the Cultivation of Science, Kolkata 700032, India
| | - Uttam Kumar Ghorai
- Department of Industrial Chemistry and Swami Vivekananda Research Centre, Ramakrishna Mission Vidyamandira, Belur Math, Howrah 711202, India
| | - Ullrich Scherf
- Macromolecular Chemistry and Institute for Polymer Technology, Wuppertal University, Gauss-Strasse 20, 42119 Wuppertal, Germany
| | - Somobrata Acharya
- School of Applied and Interdisciplinary Sciences, Indian Association for the Cultivation of Science, Kolkata 700032, India
| | - Santanu Bhattacharya
- School of Applied and Interdisciplinary Sciences, Indian Association for the Cultivation of Science, Kolkata 700032, India
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23
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Mondal T, Ghorai UK, Saha SK. Dual-Emissive Carbon Quantum Dot-Tb Nanocomposite as a Fluorescent Indicator for a Highly Selective Visual Detection of Hg(II) in Water. ACS Omega 2018; 3:11439-11446. [PMID: 31459247 PMCID: PMC6645128 DOI: 10.1021/acsomega.8b01159] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2018] [Accepted: 08/15/2018] [Indexed: 05/31/2023]
Abstract
We report very fast, green, and large-scale synthesis of amino-functionalized carbon quantum dots (CQDs) using a domestic microwave to investigate CQD-Tb-based dual emission for visual detection of toxic Hg2+. Citric acid and p-phenylenediamine are used as precursor materials to synthesize the CQD, which shows excitation-independent blue luminescence. To achieve the dual emission, Tb-containing CQD is synthesized in a very easy and cost-effective way. These dual-emissive fluorescent materials have been successfully used as a fluorescent indicator for visual detection of toxic Hg2+ metal ions. An instant color change from blue to green in the presence of a very low amount of Hg2+ under a UV lamp (λ365nm) is observed. The material is highly sensitive and selective toward detection of mercury ions in the presence of other metal ions. The photoluminescence quenching mechanism (photoinduced electron transfer process) has been explained using an electronic band diagram supported by zeta-potential and time-correlated single photon counting measurements.
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Affiliation(s)
- Tapas
Kumar Mondal
- Department
of Materials Science, Indian Association
for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Uttam Kumar Ghorai
- Department
of Industrial Chemistry and Applied Chemistry, Swami Vivekananda Research
Center, Ramakrishna Mission Vidyamandira, Belur Math, Howrah 711202, India
| | - Shyamal K. Saha
- Department
of Materials Science, Indian Association
for the Cultivation of Science, Jadavpur, Kolkata 700032, India
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24
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Roy R, Thapa R, Biswas S, Saha S, Ghorai UK, Sen D, Kumar EM, Kumar GS, Mazumder N, Roy D, Chattopadhyay KK. Resonant energy transfer in a van der Waals stacked MoS 2 - functionalized graphene quantum dot composite with ab initio validation. Nanoscale 2018; 10:16822-16829. [PMID: 30167606 DOI: 10.1039/c8nr04412k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [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
Graphene-based van der Waals (vdW) heterostructures can facilitate exciting charge transfer dynamics in between structural layers with the emission of excitonic quasi-particles. However, the chemical formation of such heterostructures has been elusive thus far. In this work, a simple chemical approach is described to form such van der Waals (vdW) heterostructures using few layer MoS2 sheet embedded quantum dots (QDs) and amine-functionalized graphene quantum dots (GQDs) to probe the energy transfer mechanism for tunable photoluminescence (PL). Our findings reveal an interesting non-radiative Förster-type energy transfer with the quenching of functional GQD PL intensity after GQD/MoS2 composite formation, which validates the existing charge transfer dynamics analogous to 0D and 2D systems. The non-radiative type of energy transfer characteristic from GQD into the MoS2 layer through vdW interactions has been confirmed by photoluminescence, time decay analyses and ab initio calculations with the shifting of the Fermi level in the density of states towards the conduction band in the stacked configuration. These results are encouraging for the fundamental exploration of optical properties in other chemically prepared QD/2D based heterostructures to understand the charge transfer mechanism and fingerprint luminescence quenching for future optoelectronic device and optical sensing applications.
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Affiliation(s)
- Rajarshi Roy
- Thin Film and Nanoscience Laboratory, Dept. of Physics, Jadavpur University, Kolkata-700032, India.
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25
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Das P, Ganguly S, Mondal S, Ghorai UK, Maity PP, Choudhary S, Gangopadhyay S, Dhara S, Banerjee S, Das NC. Dual doped biocompatible multicolor luminescent carbon dots for bio labeling, UV-active marker and fluorescent polymer composite. LUMINESCENCE 2018; 33:1136-1145. [DOI: 10.1002/bio.3520] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Revised: 04/27/2018] [Accepted: 05/28/2018] [Indexed: 12/23/2022]
Affiliation(s)
- Poushali Das
- School of Nanoscience and Technology; Indian Institute of Technology; Kharagpur India
| | - Sayan Ganguly
- Rubber Technology Center; Indian Institute of Technology; Kharagpur India
| | - Subhadip Mondal
- Rubber Technology Center; Indian Institute of Technology; Kharagpur India
| | - Uttam Kumar Ghorai
- Department of Industrial Chemistry and Applied Chemistry, Swami Vivekananda Research Center; Ramakrishna Mission Vidyamandira; Belur Math Howrah India
| | - Priti Prasanna Maity
- School of Medical Science and Technology; Indian Institute of Technology; Kharagpur India
| | - Sumita Choudhary
- Department of Physics; Birla Institute of Technology and Science; Pilani Rajasthan India
| | - Subhashis Gangopadhyay
- Department of Physics; Birla Institute of Technology and Science; Pilani Rajasthan India
| | - Santanu Dhara
- School of Medical Science and Technology; Indian Institute of Technology; Kharagpur India
| | - Susanta Banerjee
- Materials Science Center; Indian Institute of Technology; Kharagpur India
| | - Narayan Ch. Das
- School of Nanoscience and Technology; Indian Institute of Technology; Kharagpur India
- Rubber Technology Center; Indian Institute of Technology; Kharagpur India
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26
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Banerjee D, Ghorai UK, Das NS, Das B, Thakur S, Chattopadhyay KK. Amorphous Carbon Nanotubes-Nickel Oxide Nanoflower Hybrids: A Low Cost Energy Storage Material. ACS Omega 2018; 3:6311-6320. [PMID: 31458813 PMCID: PMC6644548 DOI: 10.1021/acsomega.8b00798] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/24/2018] [Accepted: 06/01/2018] [Indexed: 06/10/2023]
Abstract
Amorphous carbon nanotubes (a-CNTs) have been synthesized by a simple low-temperature process and have been grafted with chemically synthesized nickel oxide microflowers with different concentrations. The phase and morphology of the as-prepared pure and hybrid samples were characterized by X-ray diffraction and field emission scanning and transmission electron microscopes. Thermal properties of the samples were estimated by using thermal gravimetric and differential thermal analysis. The optical properties of the sample were characterized by UV-vis spectroscopic, Raman spectroscopic, and Fourier-transformed infrared spectroscopic analysis. The electrochemical performance of all hybrid samples has been done in detail for different scan rates as well as from charge-discharge analysis. It has been seen that because of the nickel oxide grafting, the electrochemical performance of pure a-CNTs gets enhanced significantly. The value of the specific capacitance of the hybrid comes out to be around 120 F/g for the best sample, which is almost 12 times higher compared to that of the pure a-CNTs. The result has been explained in terms of change in effective surface area as well as change in conductivity of the hybrid samples.
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Affiliation(s)
- Diptonil Banerjee
- Dr.
M.N. Dastur School of Materials Science Engineering Botanic Garden, Indian Institute of Engineering Science and Technology, Shibpur, 711103 Howrah, India
| | - Uttam Kumar Ghorai
- Department
of Industrial Chemistry, Ramakrishna Mission
Vidyamandira, Belur Math, 711202 Howrah, India
| | - Nirmalya Sankar Das
- School of materials Science and Nanotechnology and Thin Film and
Nanoscience Laboratory,
Department of Physics, Jadavpur University, 700032 Kolkata, India
| | - Biswajit Das
- School of materials Science and Nanotechnology and Thin Film and
Nanoscience Laboratory,
Department of Physics, Jadavpur University, 700032 Kolkata, India
| | - Subhasish Thakur
- School of materials Science and Nanotechnology and Thin Film and
Nanoscience Laboratory,
Department of Physics, Jadavpur University, 700032 Kolkata, India
| | - Kalyan Kumar Chattopadhyay
- School of materials Science and Nanotechnology and Thin Film and
Nanoscience Laboratory,
Department of Physics, Jadavpur University, 700032 Kolkata, India
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27
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Sett A, Das D, Banerjee D, Ghorai UK, Das NS, Das B, Chattopadhyay KK. 1D-2D hybrids as efficient optoelectronic materials: a study on graphitic carbon nitride nanosheets wrapped with zinc oxide rods. Dalton Trans 2018; 47:4501-4507. [PMID: 29505061 DOI: 10.1039/c8dt00016f] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [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
Zinc oxide (ZnO) nanorods (NRs) wrapped with graphitic carbon nitride (GCN) nanosheet (NS) hybrids have been synthesized by a simple chemical process. The as-prepared samples are characterized by X-ray diffraction, field emission scanning electron microscopy, high resolution transmission electron microscopy, Fourier transformed infrared spectroscopy, UV-Vis spectroscopy and photoluminescence spectroscopy. The images obtained from the transmission electron microscopic study and the existence of C-N stretching modes as observed from Fourier transform infrared spectroscopy confirm the successful attachment of GCN NSs onto the ZnO NRs. It is seen that hybrid samples show broad photoluminescence (PL) emission with enhanced defect related emission along with a quenching effect due to the charge transfer mechanism. The results have been explained by taking into consideration the three different types of electron transitions occurring within the type-II band structure of the hybrid samples. Moreover a study on the conductivity of the samples is carried out under dark conditions and also under ultraviolet (UV) light irradiation. It is observed that the hybrid samples show significantly improved conductivity under both dark and UV irradiated conditions. The absorbance of the samples in the UV range shows better conductivity under UV conditions as compared to dark conditions.
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Affiliation(s)
- A Sett
- School of Material Science and Nanotechnology, Jadavpur University, Kolkata 700032, India.
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28
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Chatterjee R, Saha S, Sen D, Panigrahi K, Ghorai UK, Das GC, Chattopadhyay KK. Neutralizing the Charge Imbalance Problem in Eu 3+-Activated BaAl 2O 4 Nanophosphors: Theoretical Insights and Experimental Validation Considering K + Codoping. ACS Omega 2018; 3:788-800. [PMID: 31457929 PMCID: PMC6641287 DOI: 10.1021/acsomega.7b01525] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2017] [Accepted: 01/04/2018] [Indexed: 05/05/2023]
Abstract
In recent years, rare-earth-doped nanophosphors have attracted great attention in the field of luminescent materials for advanced solid-state lighting and high-resolution display applications. However, the low efficiency of concurrent red phosphors creates a major bottleneck for easy commercialization of these devices. In this work, intense red-light-emitting K+-codoped BaAl2O4:Eu3+ nanophosphors having an average crystallite size of 54 nm were synthesized via a modified sol-gel method. The derived nanophosphors exhibit strong red emission produced by the 5D0 → 7F J (J = 0, 1, 2, 3, 4) transitions of Eu3+ upon UV and low-voltage electron beam excitation. Comparative photoluminescence (PL) analysis is executed for Eu3+-activated and K+-coactivated BaAl2O4:Eu3+ nanophosphors, demonstrating remarkable enhancement in PL intensity as well as thermal stability due to K+ codoping. The origin of this PL enhancement is also analyzed from first-principles calculations using density functional theory. Achievement of charge compensation with the addition of a K+ coactivator plays an important role in increasing the radiative lifetime and color purity of the codoped nanophosphors. Obtained results substantially approve the promising prospects of this nanophosphor in the promptly growing field of solid-state lighting and field emission display devices.
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Affiliation(s)
- Rituparna Chatterjee
- School
of Materials Science and Nanotechnology and Department of Physics, Jadavpur University, Kolkata 700032, India
| | - Subhajit Saha
- School
of Materials Science and Nanotechnology and Department of Physics, Jadavpur University, Kolkata 700032, India
| | - Dipayan Sen
- School
of Materials Science and Nanotechnology and Department of Physics, Jadavpur University, Kolkata 700032, India
| | - Karamjyoti Panigrahi
- School
of Materials Science and Nanotechnology and Department of Physics, Jadavpur University, Kolkata 700032, India
| | - Uttam Kumar Ghorai
- Department
of Industrial Chemistry & Swami Vivekananda Research Centre, Ramakrishna Mission Vidyamandira, Belur Math, Howrah 711202, India
| | - Gopes Chandra Das
- School
of Materials Science and Nanotechnology and Department of Physics, Jadavpur University, Kolkata 700032, India
| | - Kalyan Kumar Chattopadhyay
- School
of Materials Science and Nanotechnology and Department of Physics, Jadavpur University, Kolkata 700032, India
- E-mail:
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29
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Panigrahi K, Saha S, Sain S, Chatterjee R, Das A, Ghorai UK, Sankar Das N, Chattopadhyay KK. White light emitting MgAl2O4:Dy3+,Eu3+ nanophosphor for multifunctional applications. Dalton Trans 2018; 47:12228-12242. [DOI: 10.1039/c8dt02227e] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [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
An efficient energy transfer from Dy3+ to Eu3+ in MgAl2O4 offers white light emission and self-referencing thermal behaviour.
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Affiliation(s)
- Karamjyoti Panigrahi
- School of Materials Science and Nanotechnology
- Jadavpur University
- Kolkata-700032
- India
| | - Subhajit Saha
- School of Materials Science and Nanotechnology
- Jadavpur University
- Kolkata-700032
- India
| | - Sumanta Sain
- Department of Materials Science
- Indian Association for the Cultivation of Science
- Kolkata-700 032
- India
| | - Rituparna Chatterjee
- School of Materials Science and Nanotechnology
- Jadavpur University
- Kolkata-700032
- India
| | - Antika Das
- School of Materials Science and Nanotechnology
- Jadavpur University
- Kolkata-700032
- India
| | - Uttam Kumar Ghorai
- Department of Industrial Chemistry & Swami Vivekananda Research Centre
- Ramakrishna Mission Vidyamandira
- Howrah
- India
| | - Nirmalya Sankar Das
- School of Materials Science and Nanotechnology
- Jadavpur University
- Kolkata-700032
- India
| | - Kalyan Kumar Chattopadhyay
- School of Materials Science and Nanotechnology
- Jadavpur University
- Kolkata-700032
- India
- Department of Physics
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30
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Das A, Saha S, Panigrahi K, Mitra A, Chatterjee R, Ghorai UK, Das B, Chattopadhyay KK. Morphology control and photoluminescence properties of Eu3+-activated Y4Al2O9 nanophosphors for solid state lighting applications. CrystEngComm 2018. [DOI: 10.1039/c8ce00289d] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Spherical Eu3+:Y4Al2O9 nanophosphors exhibit brilliant PL behavior with enhanced color purity and excited state lifetime.
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Affiliation(s)
- Antika Das
- School of Materials Science and Nanotechnology
- Jadavpur University
- Kolkata-700032
- India
| | - Subhajit Saha
- School of Materials Science and Nanotechnology
- Jadavpur University
- Kolkata-700032
- India
| | - Karamjyoti Panigrahi
- School of Materials Science and Nanotechnology
- Jadavpur University
- Kolkata-700032
- India
| | - Anuradha Mitra
- Department of Physics
- Jadavpur University
- Kolkata-700032
- India
| | - Rituparna Chatterjee
- School of Materials Science and Nanotechnology
- Jadavpur University
- Kolkata-700032
- India
| | - Uttam Kumar Ghorai
- Department of Industrial Chemistry and Applied Chemistry
- Swami Vivekananda Research Center
- Ramakrishna Mission Vidyamandira
- Howrah-711202
- India
| | - Biswajit Das
- Department of Physics
- Jadavpur University
- Kolkata-700032
- India
| | - Kalyan Kumar Chattopadhyay
- School of Materials Science and Nanotechnology
- Jadavpur University
- Kolkata-700032
- India
- Department of Physics
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31
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Sarkar S, Howli P, Ghorai UK, Das B, Samanta M, Das NS, Chattopadhyay KK. Flower-like Cu2NiSnS4 microspheres for application as electrodes of asymmetric supercapacitors endowed with high energy density. CrystEngComm 2018. [DOI: 10.1039/c7ce02101a] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Asymmetric supercapacitors with superior specific capacitance and energy density are fabricated using Cu2NiSnS4, a novel and environmentally benign chalcogenide material.
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Affiliation(s)
- Samrat Sarkar
- School of Materials Science and Nanotechnology
- Jadavpur University
- Kolkata 700032
- India
| | - Promita Howli
- Thinfilm and Nanoscience Laboratory
- Department of Physics
- Jadavpur University
- Kolkata 700032
- India
| | - Uttam Kumar Ghorai
- Department of Industrial Chemistry and Applied Chemistry
- Swami Vivekananda Research Center
- Ramakrishna Mission Vidyamandira
- Howrah 711202
- India
| | - Biswajit Das
- Thinfilm and Nanoscience Laboratory
- Department of Physics
- Jadavpur University
- Kolkata 700032
- India
| | - Madhupriya Samanta
- School of Materials Science and Nanotechnology
- Jadavpur University
- Kolkata 700032
- India
| | - Nirmalya Sankar Das
- School of Materials Science and Nanotechnology
- Jadavpur University
- Kolkata 700032
- India
| | - Kalyan Kumar Chattopadhyay
- School of Materials Science and Nanotechnology
- Jadavpur University
- Kolkata 700032
- India
- Thinfilm and Nanoscience Laboratory
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32
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Mazumder N, Mandal P, Roy R, Ghorai UK, Saha S, Chattopadhyay KK. Exploring the effect of hole localization on the charge-phonon dynamics of hole doped delafossite. J Phys Condens Matter 2017; 29:375701. [PMID: 28664872 DOI: 10.1088/1361-648x/aa7cb2] [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: 06/07/2023]
Abstract
For weak or moderate doping, electrical measurement is not suitable for detecting changes in the charge localization inside a semiconductor. Here, to investigate the nature of charge-phonon coupling in the presence of gradually delocalized holes within a weak doping regime (~1016 cm-3), we examine the temperature dependent Raman spectra (303-817 K) of prototype hole doped delafossite [Formula: see text] (x = 0/0.03, y = 0/0.01). For both [Formula: see text] and [Formula: see text] phonons, negative lineshape asymmetry and relative thermal hardening are distinctly observed upon [Formula: see text] and [Formula: see text] doping. Using Allen formalism, charge density of states at the Fermi level per spin and molecule, and charge delocalization associated to [Formula: see text] plane, are estimated to increase appreciably upon codoping compared to the [Formula: see text]-axis. We delineate the interdependence between charge-phonon coupling constant ([Formula: see text]) and anharmonic phonon lifetime ([Formula: see text]), and deduce that excitation of delocalized holes weakly coupled with phonons of larger [Formula: see text] is the governing feature of observed Fano asymmetry ([Formula: see text]) reversal.
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Affiliation(s)
- Nilesh Mazumder
- Physics Department, Jadavpur University, Kolkata 700032, India
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33
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Sengupta S, Das T, Ghorai UK, Bandyopadhyay A. Copolymers from methyl methacrylate and butyl acrylate with hyperbranched architecture. J Appl Polym Sci 2017. [DOI: 10.1002/app.45356] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Srijoni Sengupta
- Department of Polymer Science & Technology; University of Calcutta; Kolkata 700009 India
| | - Tamalika Das
- Department of Polymer Science & Technology; University of Calcutta; Kolkata 700009 India
| | - Uttam Kumar Ghorai
- Department of Industrial Chemistry and Applied Chemistry; Swami Vivekananda Research Center, Ramakrishna Mission Vidyamandira; Howrah 711202 India
| | - Abhijit Bandyopadhyay
- Department of Polymer Science & Technology; University of Calcutta; Kolkata 700009 India
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34
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Das S, Ghorai UK, Dey R, Ghosh CK, Pal M. Novel multiple phosphorescence in nanostructured zinc oxide and calculations of correlated colour temperature. Phys Chem Chem Phys 2017; 19:22995-23006. [DOI: 10.1039/c7cp03631k] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [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
A thermodynamic explanation using defect chemistry for the temperature and atmosphere dependent novel multiple phosphorescence in ZnO nanoparticles (∼160 nm) fit for cool lighting application is reported.
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Affiliation(s)
- Sagnik Das
- Sensor & Actuator Division
- CSIR-CGCRI
- Kolkata-700032
- India
| | - Uttam Kumar Ghorai
- Department of Industrial Chemistry & Swami Vivekananda Research Centre
- Ramakrishna Mission Vidyamandira
- Howrah-711202
- India
| | - Rajib Dey
- Department of Metallurgical and Material Engineering
- Jadavpur University
- Kolkata-700032
- India
| | - Chandan Kumar Ghosh
- School of Materials Science and Nanotechnology
- Jadavpur University
- Kolkata-700032
- India
| | - Mrinal Pal
- Sensor & Actuator Division
- CSIR-CGCRI
- Kolkata-700032
- India
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35
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Saha S, Roy R, Das S, Sen D, Ghorai UK, Mazumder N, Chattopadhyay KK. Local Field Enhancement-Induced Enriched Cathodoluminescence Behavior from CuI-RGO Nanophosphor Composite for Field-Emission Display Applications. ACS Appl Mater Interfaces 2016; 8:25571-25577. [PMID: 27166784 DOI: 10.1021/acsami.6b02047] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Field-emission displays (FEDs) constitute one of the major foci of the cutting edge materials research because of the increasingly escalating demand for high-resolution display panels. However, poor efficiencies of the concurrent low voltage cathodoluminescence (CL) phosphors have created a serious bottleneck in the commercialization of such devices. Herein we report a novel CuI-RGO composite nanophosphor that exhibits bright red emission under low voltage electron beam excitation. Quantitative assessment of CL spectra reveals that CuI-RGO nanocomposite phosphor leads to the 4-fold enhancement in the CL intensity as compared to the pristine CuI counterpart. Addition of RGO in the CuI matrix facilitates efficient triggering of luminescence centers that are activated by local electric field enhancement at the CuI-RGO contact points. In addition, conducting RGO also reduces the negative loading problem on the surface of the nanophosphor composite. The concept presented here opens up a novel generic route for enhancing CL intensity of the existing (nano)phosphors as well as validates the bright prospects of the CuI-RGO composite nanophosphor in this rapidly growing field.
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Affiliation(s)
- Subhajit Saha
- School of Materials Science and Nanotechnology, Jadavpur University , Kolkata 700032, India
| | - Rajarshi Roy
- School of Materials Science and Nanotechnology, Jadavpur University , Kolkata 700032, India
- Department of Physics, Jadavpur University , Kolkata 700032, India
| | - Swati Das
- Department of Physics, Jadavpur University , Kolkata 700032, India
| | - Dipayan Sen
- Department of Physics, Jadavpur University , Kolkata 700032, India
| | - Uttam Kumar Ghorai
- School of Materials Science and Nanotechnology, Jadavpur University , Kolkata 700032, India
| | - Nilesh Mazumder
- Department of Physics, Jadavpur University , Kolkata 700032, India
| | - Kalyan Kumar Chattopadhyay
- School of Materials Science and Nanotechnology, Jadavpur University , Kolkata 700032, India
- Department of Physics, Jadavpur University , Kolkata 700032, India
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36
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Mondal TK, Gupta A, Shaw BK, Mondal S, Ghorai UK, Saha SK. Highly luminescent N-doped carbon quantum dots from lemon juice with porphyrin-like structures surrounded by graphitic network for sensing applications. RSC Adv 2016. [DOI: 10.1039/c6ra12148a] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Green synthetic approach to synthesizing highly luminescent N-doped carbon quantum dots with porphyrin like moiety for sensitive and selective detection of Fe3+.
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Affiliation(s)
- Tapas Kumar Mondal
- Department of Materials Science
- Indian Association for the Cultivation of Science
- Kolkata 700032
- India
| | - Abhisek Gupta
- Department of Materials Science
- Indian Association for the Cultivation of Science
- Kolkata 700032
- India
| | - Bikash Kumar Shaw
- Department of Materials Science
- Indian Association for the Cultivation of Science
- Kolkata 700032
- India
| | - Supriya Mondal
- Department of Materials Science
- Indian Association for the Cultivation of Science
- Kolkata 700032
- India
- Department of Physics
| | - Uttam Kumar Ghorai
- Department of Industrial Chemistry and Applied Chemistry
- Swami Vivekananda Research Center
- Ramakrishna Mission Vidyamandira
- Howrah-711202
- India
| | - Shyamal K. Saha
- Department of Materials Science
- Indian Association for the Cultivation of Science
- Kolkata 700032
- India
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37
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Abstract
Field emission characteristics of well resolved ZnPc nanoflakes through hydrothermal method and simulation via finite element method.
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Affiliation(s)
- Madhupriya Samanta
- School of Materials Science and Nanotechnology
- Jadavpur University
- Kolkata 700 032
- India
| | - Uttam Kumar Ghorai
- School of Materials Science and Nanotechnology
- Jadavpur University
- Kolkata 700 032
- India
| | - Biswajit Das
- School of Materials Science and Nanotechnology
- Jadavpur University
- Kolkata 700 032
- India
| | - Promita Howli
- Thin Film & Nanoscience Laboratory
- Department of Physics
- Jadavpur University
- Kolkata 700 032
- India
| | - Swati Das
- Thin Film & Nanoscience Laboratory
- Department of Physics
- Jadavpur University
- Kolkata 700 032
- India
| | - Dipayan Sen
- Thin Film & Nanoscience Laboratory
- Department of Physics
- Jadavpur University
- Kolkata 700 032
- India
| | - Kalyan Kumar Chattopadhyay
- School of Materials Science and Nanotechnology
- Jadavpur University
- Kolkata 700 032
- India
- Thin Film & Nanoscience Laboratory
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38
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Das S, Saha S, Sen D, Ghorai UK, Chattopadhyay KK. Hierarchical cupric oxide nanostructures on copper substrate for cold cathode emission: an experimental venture with theoretical correlation. Dalton Trans 2015; 44:6098-106. [PMID: 25727565 DOI: 10.1039/c4dt02944e] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [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
In this paper we report a facile route for the synthesis of controlled CuO nanoarchitectures directly grown on a copper substrate by a one-step simple chemical route with varying concentration of non-ionic surfactant PEG-6K. The phase purity and degree of crystallinity of the as-developed nanostructures were systemically investigated by X-ray diffraction, X-ray photoelectron spectroscopy and high-resolution transmission electron microscopy (HRTEM). A detailed analysis by field emission scanning electron microscopy confirmed the uniformity of the prepared nanostructures on the substrates. These architectures displayed substantial improvement of field emission properties with respect to other structures of CuO reported so far. A particular nanostructure (needle) among them showed a down shift of the turn-on field to 2.2 V μm(-1) coupled with a good enhancement factor (β) ∼516, which are deemed as sufficient for electron emission based applications such as field emission displays and vacuum nanoelectronic devices. The origin of this efficient field emission from CuO nanoarchitectures, were probed computationally by investigating the local electric field distribution through finite element based simulation method using the ANSYS Maxwell simulation package.
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Affiliation(s)
- Swati Das
- Department of Physics, Jadavpur University, Kolkata 700032, India.
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39
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Ghorai UK, Roy R, Mazumder N, Saha S, Das S, Chattopadhyay KK. Observation of bright green luminescence in an Eu2+ complexed graphene oxide composite through reduction of Eu3+. NEW J CHEM 2015. [DOI: 10.1039/c4nj02323d] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
We have demonstrated a simplified reduction technique of Eu3+ to Eu2+ in complexation with an azo-pyridine graphene oxide composite and its effect on photoluminescence.
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Affiliation(s)
- Uttam Kumar Ghorai
- School of Materials Science and Nanotechnology
- Jadavpur University
- Kolkata 700 032
- India
| | - Rajarshi Roy
- Thin Film & Nanoscience Laboratory
- Department of Physics
- Jadavpur University
- Kolkata 700 032
- India
| | - Nilesh Mazumder
- Thin Film & Nanoscience Laboratory
- Department of Physics
- Jadavpur University
- Kolkata 700 032
- India
| | - Subhajit Saha
- School of Materials Science and Nanotechnology
- Jadavpur University
- Kolkata 700 032
- India
| | - Swati Das
- Thin Film & Nanoscience Laboratory
- Department of Physics
- Jadavpur University
- Kolkata 700 032
- India
| | - Kalyan K. Chattopadhyay
- School of Materials Science and Nanotechnology
- Jadavpur University
- Kolkata 700 032
- India
- Thin Film & Nanoscience Laboratory
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40
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Das T, Sengupta S, Ghorai UK, Dey A, Bandyopadhyay A. Sequential amphiphilic and pH responsive hyperbranched copolymer: influence of hyper branching/pendant groups on reversible self assembling from polymersomes to aggregates and usefulness in waste water treatment. RSC Adv 2015. [DOI: 10.1039/c5ra22567a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Hyperbranched copolymers self assembled from polymersomes to aggregates and encapsulated both hydrophilic/hydrophobic molecules but with varied retention proficiency depending upon the medium pH.
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Affiliation(s)
- Tamalika Das
- Department of Polymer Science & Technology
- University of Calcutta
- Kolkata-700009
- India
| | - Srijoni Sengupta
- Department of Polymer Science & Technology
- University of Calcutta
- Kolkata-700009
- India
| | - Uttam Kumar Ghorai
- Department of Industrial Chemistry & Applied Chemistry
- Swami Vivekananda Research Center
- Ramakrishna Mission Vidyamandira
- Howrah-711202
- India
| | - Ayan Dey
- Department of Polymer Science & Technology
- University of Calcutta
- Kolkata-700009
- India
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41
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Kumar Ghorai U, Saha S, Mazumder N, Das NS, Banerjee D, Sen D, Chattopadhyay KK. Experimental and theoretical investigation of enhanced cold cathode emission by plasma-etched 3d array of nanotips derived from CuPc nanotube. RSC Adv 2015. [DOI: 10.1039/c4ra11298a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [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
Experimentally observed field emission responses of 3D copper phthalocyanine (CuPc) nanotip arrays synthesized over nanotube walls by facile plasma treatment and theoretical justifications via finite element method based simulations.
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Affiliation(s)
- Uttam Kumar Ghorai
- School of Materials Science and Nanotechnology
- Jadavpur University
- Kolkata 700 032
- India
| | - Subhajit Saha
- School of Materials Science and Nanotechnology
- Jadavpur University
- Kolkata 700 032
- India
| | - Nilesh Mazumder
- Thin Film & Nanoscience Laboratory
- Department of Physics
- Jadavpur University
- Kolkata 700 032
- India
| | - Nirmalya S. Das
- School of Materials Science and Nanotechnology
- Jadavpur University
- Kolkata 700 032
- India
| | - Diptonil Banerjee
- School of Materials Science and Nanotechnology
- Jadavpur University
- Kolkata 700 032
- India
| | - Dipayan Sen
- Thin Film & Nanoscience Laboratory
- Department of Physics
- Jadavpur University
- Kolkata 700 032
- India
| | - Kalyan K. Chattopadhyay
- School of Materials Science and Nanotechnology
- Jadavpur University
- Kolkata 700 032
- India
- Thin Film & Nanoscience Laboratory
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42
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Kumar GS, Roy R, Sen D, Ghorai UK, Thapa R, Mazumder N, Saha S, Chattopadhyay KK. Amino-functionalized graphene quantum dots: origin of tunable heterogeneous photoluminescence. Nanoscale 2014; 6:3384-91. [PMID: 24531861 DOI: 10.1039/c3nr05376h] [Citation(s) in RCA: 106] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Graphene quantum dots are known to exhibit tunable photoluminescence (PL) through manipulation of edge functionality under various synthesis conditions. Here, we report observation of excitation dependent anomalous m-n type fingerprint PL transition in synthesized amino functionalized graphene quantum dots (5-7 nm). The effect of band-to-band π*-π and interstate to band n-π induced transitions led to effective multicolor emission under changeable excitation wavelength in the functionalized system. A reasonable assertion that equi-coupling of π*-π and n-π transitions activated the heterogeneous dual mode cyan emission was made upon observation of the PL spectra. Furthermore, investigation of incremented dimensional scaling through facile synthesis of amino functionalized quantum graphene flakes (20-30 nm) revealed it had negligible effect on the modulated PL pattern. Moreover, an effort was made to trace the origin of excitation dependent tunable heterogeneous photoluminescence through the framework of energy band diagram hypothesis and first principles analysis. Ab initio results suggested formation of an interband state as a manifestation of p orbital hybridization between C-N atoms at the edge sites. Therefore comprehensive theoretical and experimental analysis revealed that newly created energy levels can exist as an interband within the energy gap in functionalized graphene quantum structures yielding excitation dependent tunable PL for optoelectronic applications.
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Affiliation(s)
- G Sandeep Kumar
- School of Materials Science and Nanotechnology, Jadavpur University, Kolkata-700032, India
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43
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Ghorai UK, Das S, Saha S, Mazumder N, Sen D, Chattopadhyay KK. Efficient and persistent cold cathode emission from CuPc nanotubes: a joint experimental and simulation investigation. Dalton Trans 2014; 43:9260-6. [DOI: 10.1039/c4dt00300d] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Experimentally observed excellent cold cathode emission characteristics of chemically synthesized CuPc nanotubes and theoretical justifications via finite element method simulation.
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Affiliation(s)
- Uttam Kumar Ghorai
- School of Materials Science and Nanotechnology
- Jadavpur University
- Kolkata 700 032, India
| | - Swati Das
- Thin Film & Nanoscience Laboratory
- Department of Physics
- Jadavpur University
- Kolkata 700 032, India
| | - Subhajit Saha
- School of Materials Science and Nanotechnology
- Jadavpur University
- Kolkata 700 032, India
| | - Nilesh Mazumder
- Thin Film & Nanoscience Laboratory
- Department of Physics
- Jadavpur University
- Kolkata 700 032, India
| | - Dipayan Sen
- Thin Film & Nanoscience Laboratory
- Department of Physics
- Jadavpur University
- Kolkata 700 032, India
| | - Kalyan Kumar Chattopadhyay
- School of Materials Science and Nanotechnology
- Jadavpur University
- Kolkata 700 032, India
- Thin Film & Nanoscience Laboratory
- Department of Physics
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Saha S, Das S, Ghorai UK, Mazumder N, Gupta BK, Chattopadhyay KK. Charge compensation assisted enhanced photoluminescence derived from Li-codoped MgAl2O4:Eu3+ nanophosphors for solid state lighting applications. Dalton Trans 2013; 42:12965-74. [DOI: 10.1039/c3dt51411k] [Citation(s) in RCA: 97] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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