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Mazzola F, Hassani H, Amoroso D, Chaluvadi SK, Fujii J, Polewczyk V, Rajak P, Koegler M, Ciancio R, Partoens B, Rossi G, Vobornik I, Ghosez P, Orgiani P. Unveiling the Electronic Structure of Pseudotetragonal WO 3 Thin Films. J Phys Chem Lett 2023; 14:7208-7214. [PMID: 37551605 PMCID: PMC10440808 DOI: 10.1021/acs.jpclett.3c01546] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Accepted: 07/26/2023] [Indexed: 08/09/2023]
Abstract
WO3 is a 5d compound that undergoes several structural transitions in its bulk form. Its versatility is well-documented, with a wide range of applications, such as flexopiezoelectricity, electrochromism, gating-induced phase transitions, and its ability to improve the performance of Li-based batteries. The synthesis of WO3 thin films holds promise in stabilizing electronic phases for practical applications. However, despite its potential, the electronic structure of this material remains experimentally unexplored. Furthermore, its thermal instability limits its use in certain technological devices. Here, we employ tensile strain to stabilize WO3 thin films, which we call the pseudotetragonal phase, and investigate its electronic structure using a combination of photoelectron spectroscopy and density functional theory calculations. This study reveals the Fermiology of the system, notably identifying significant energy splittings between different orbital manifolds arising from atomic distortions. These splittings, along with the system's thermal stability, offer a potential avenue for controlling inter- and intraband scattering for electronic applications.
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Affiliation(s)
- F. Mazzola
- Department
of Molecular Sciences and Nanosystems, Ca’
Foscari University of Venice, 30172 Venice, Italy
- Istituto
Officina dei Materiali (IOM)-CNR, Area Science Park, 34149 Trieste, Italy
| | - H. Hassani
- Theoretical
Materials Physics, Q-MAT, CESAM, Université
de Liège, B-4000 Liège, Belgium
- Department
of Physics, University of Antwerp, 2020 Antwerp, Belgium
| | - D. Amoroso
- Theoretical
Materials Physics, Q-MAT, CESAM, Université
de Liège, B-4000 Liège, Belgium
| | - S. K. Chaluvadi
- Istituto
Officina dei Materiali (IOM)-CNR, Area Science Park, 34149 Trieste, Italy
| | - J. Fujii
- Istituto
Officina dei Materiali (IOM)-CNR, Area Science Park, 34149 Trieste, Italy
| | - V. Polewczyk
- Istituto
Officina dei Materiali (IOM)-CNR, Area Science Park, 34149 Trieste, Italy
| | - P. Rajak
- Istituto
Officina dei Materiali (IOM)-CNR, Area Science Park, 34149 Trieste, Italy
| | - Max Koegler
- Istituto
Officina dei Materiali (IOM)-CNR, Area Science Park, 34149 Trieste, Italy
| | - R. Ciancio
- Area
Science Park, Padriciano
99, 34149 Trieste, Italy
| | - B. Partoens
- Department
of Physics, University of Antwerp, 2020 Antwerp, Belgium
| | - G. Rossi
- Istituto
Officina dei Materiali (IOM)-CNR, Area Science Park, 34149 Trieste, Italy
- University
of Milano, I-20133 Milano, Italy
| | - I. Vobornik
- Istituto
Officina dei Materiali (IOM)-CNR, Area Science Park, 34149 Trieste, Italy
| | - P. Ghosez
- Theoretical
Materials Physics, Q-MAT, CESAM, Université
de Liège, B-4000 Liège, Belgium
| | - P. Orgiani
- Istituto
Officina dei Materiali (IOM)-CNR, Area Science Park, 34149 Trieste, Italy
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Orgiani P, Chaluvadi SK, Chalil SP, Mazzola F, Jana A, Dolabella S, Rajak P, Ferrara M, Benedetti D, Fondacaro A, Salvador F, Ciancio R, Fujii J, Panaccione G, Vobornik I, Rossi G. Dual pulsed laser deposition system for the growth of complex materials and heterostructures. Rev Sci Instrum 2023; 94:033903. [PMID: 37012774 DOI: 10.1063/5.0138889] [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] [Received: 12/15/2022] [Accepted: 02/12/2023] [Indexed: 06/19/2023]
Abstract
Here, we present an integrated ultra-high-vacuum (UHV) apparatus for the growth of complex materials and heterostructures. The specific growth technique is the Pulsed Laser Deposition (PLD) by means of a dual-laser source based on an excimer KrF ultraviolet and solid-state Nd:YAG infra-red lasers. By taking advantage of the two laser sources-both lasers can be independently used within the deposition chambers-a large number of different materials-ranging from oxides to metals, to selenides, and others-can be successfully grown in the form of thin films and heterostructures. All of the samples can be in situ transferred between the deposition chambers and the analysis chambers by using vessels and holders' manipulators. The apparatus also offers the possibility to transfer samples to remote instrumentation under UHV conditions by means of commercially available UHV-suitcases. The dual-PLD operates for in-house research as well as user facility in combination with the Advanced Photo-electric Effect beamline at the Elettra synchrotron radiation facility in Trieste and allows synchrotron-based photo-emission as well as x-ray absorption experiments on pristine films and heterostructures.
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Affiliation(s)
- P Orgiani
- CNR-IOM Istituto Officina dei Materiali, TASC Laboratory, Area Science Park, S.S. 14, km 163.5, I-34149 Trieste, Italy
| | - S K Chaluvadi
- CNR-IOM Istituto Officina dei Materiali, TASC Laboratory, Area Science Park, S.S. 14, km 163.5, I-34149 Trieste, Italy
| | - S Punathum Chalil
- CNR-IOM Istituto Officina dei Materiali, TASC Laboratory, Area Science Park, S.S. 14, km 163.5, I-34149 Trieste, Italy
| | - F Mazzola
- Department of Molecular Sciences and Nanosystems, Ca' Foscari University of Venice, 30172 Venice, Italy
| | - A Jana
- CNR-IOM Istituto Officina dei Materiali, TASC Laboratory, Area Science Park, S.S. 14, km 163.5, I-34149 Trieste, Italy
| | - S Dolabella
- CNR-IOM Istituto Officina dei Materiali, TASC Laboratory, Area Science Park, S.S. 14, km 163.5, I-34149 Trieste, Italy
| | - P Rajak
- CNR-IOM Istituto Officina dei Materiali, TASC Laboratory, Area Science Park, S.S. 14, km 163.5, I-34149 Trieste, Italy
| | - M Ferrara
- CNR-IOM Istituto Officina dei Materiali, TASC Laboratory, Area Science Park, S.S. 14, km 163.5, I-34149 Trieste, Italy
| | - D Benedetti
- CNR-IOM Istituto Officina dei Materiali, TASC Laboratory, Area Science Park, S.S. 14, km 163.5, I-34149 Trieste, Italy
| | - A Fondacaro
- CNR-IOM Istituto Officina dei Materiali, TASC Laboratory, Area Science Park, S.S. 14, km 163.5, I-34149 Trieste, Italy
| | - F Salvador
- CNR-IOM Istituto Officina dei Materiali, TASC Laboratory, Area Science Park, S.S. 14, km 163.5, I-34149 Trieste, Italy
| | - R Ciancio
- AREA Science Park, Padriciano 99, I-34149 Trieste, Italy
| | - J Fujii
- CNR-IOM Istituto Officina dei Materiali, TASC Laboratory, Area Science Park, S.S. 14, km 163.5, I-34149 Trieste, Italy
| | - G Panaccione
- CNR-IOM Istituto Officina dei Materiali, TASC Laboratory, Area Science Park, S.S. 14, km 163.5, I-34149 Trieste, Italy
| | - I Vobornik
- CNR-IOM Istituto Officina dei Materiali, TASC Laboratory, Area Science Park, S.S. 14, km 163.5, I-34149 Trieste, Italy
| | - G Rossi
- CNR-IOM Istituto Officina dei Materiali, TASC Laboratory, Area Science Park, S.S. 14, km 163.5, I-34149 Trieste, Italy
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Rajak P, Vijayalakshmi MA, Jayaprakash NS. Production and characterization of monoclonal antibodies (mAbs) against human serum albumin (HSA) for the development of an immunoaffinity system with oriented anti-HSA mAbs as immobilized ligand. J Pharm Biomed Anal 2013; 78-79:154-60. [PMID: 23499914 DOI: 10.1016/j.jpba.2013.02.010] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2012] [Revised: 02/09/2013] [Accepted: 02/13/2013] [Indexed: 10/27/2022]
Abstract
Proteins present in human serum are of immense importance in the field of biomarker discovery. But, the presence of high-abundant proteins like albumin makes the analysis more challenging because of masking effect on low-abundant proteins. Therefore, removal of albumin using highly specific monoclonal antibodies (mAbs) can potentiate the discovery of low-abundant proteins. In the present study, mAbs against human serum albumin (HSA) were developed and integrated in to an immunoaffinity based system for specific removal of albumin from the serum. Hybridomas were obtained by fusion of Sp2/0 mouse myeloma cells with spleen cells from the mouse immunized with HSA. Five clones (AHSA1-5) producing mAbs specific to HSA were established and characterized by enzyme linked immunosorbent assay (ELISA) and immunoblotting for specificity, sensitivity and affinity in terms of antigen binding. The mAbs were able to bind to both native albumin as well as its glycated isoform. Reactivity of mAbs with different mammalian sera was tested. The affinity constant of the mAbs ranged from 10(8) to 10(9)M(-1). An approach based on oriented immobilization was followed to immobilize purified anti-HSA mAbs on hydrazine activated agarose gel and the dynamic binding capacity of the column was determined.
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Affiliation(s)
- Poonam Rajak
- Centre for Bioseparation Technology, VIT University, Vellore-632014, Tamil Nadu, India
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Kumar BP, Rajak P, Vijayalakshmi MA, Jayaprakash NS. Production of human anti-glycophorin-A monoclonal antibodies and their purification by pseudoaffinity chromatography using a convective interaction media monolithic column. Hybridoma (Larchmt) 2012; 31:105-10. [PMID: 22509914 DOI: 10.1089/hyb.2011.0104] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Monoclonal antibodies (MAbs) against glycophorin-A (GPA) could be used in identifying MN blood groups, detecting specific markers of erythroid differentiation, and studying parasite interactions. Large-scale production of MAbs in bioreactors demands an efficient and rapid separation technology. The present study describes the production of a human anti-GPA monoclonal antibody and its purification using a pseudo-bioaffinity L-histidine-convective interaction media (CIM) monolithic column. Hybridomas were generated by fusion of mouse myeloma cell line (Sp2/0) and spleen cells from the mouse immunized with Triton X-100 solubilized RBC membrane proteins. Hybridomas producing antibodies specific to commercial glycophorin-A were screened by indirect enzyme-linked immunosorbent assay (ELISA). The antibodies produced by the stable clones were found to be IgG1 with kappa light chain. Purification of IgG1 MAbs from the cell culture supernatant carried out with a CIM-EDA-histidine disk resulted in high specific activity with purification fold of 8.3 in the fraction eluted with MOPS buffer containing 0.2 M NaCl. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and ELISA showed that the antibodies obtained were highly pure, with high antigen-binding efficiency. The results indicate that faster separation and efficient recovery of high-purity anti-GPA MAbs could be achieved by using CIM-EDA-histidine disk.
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Affiliation(s)
- B Prem Kumar
- Centre for Bio-separation Technology, Vellore Institute of Technology, VIT University, Vellore, Tamilnadu, India
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