1
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Klein J, Philippi M, Alarslan F, Jähnichen T, Enke D, Steinhart M, Haase M. Dispersible SnO 2 :Sb and TiO 2 Nanocrystals After Calcination at High Temperature. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023; 19:e2207674. [PMID: 36651001 DOI: 10.1002/smll.202207674] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Indexed: 06/17/2023]
Abstract
High-temperature treatment of functional nanomaterials, through postsynthesis calcination, often represents an important step to unlock their full potential. However, such calcination steps usually severely limit the preparation of colloidal solutions of the nanoparticles due to the formation of sintered agglomerates. Herein, a simple route is reported to obtain colloidal solutions of calcined n-conductive antimony doped tin oxide (ATO) as well as titanium dioxide (TiO2 ) nanoparticles without the need for additional sacrificial materials. This is achieved by making use of the reduced contact between individual nanoparticles when they are assembled into aerogels. Following the calcination of the aerogels at 500 °C, redispersion of the nanoparticles into stable colloidal solutions with various solvents can be achieved. Although a slight degree of sintering is inevitable, the size of the resulting aggregates in solution is still remarkably small with values below 30 nm.
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Affiliation(s)
- Jonas Klein
- Department of Chemistry, Chemistry Osnabrück, University of Osnabrück, Barbarastraße 7, D-49076, Osnabrück, Germany
| | - Michael Philippi
- Department of Chemistry, Chemistry Osnabrück, University of Osnabrück, Barbarastraße 7, D-49076, Osnabrück, Germany
| | - Fatih Alarslan
- Department of Chemistry, Chemistry Osnabrück, University of Osnabrück, Barbarastraße 7, D-49076, Osnabrück, Germany
| | - Tim Jähnichen
- Institute of Chemical Technology, Universität Leipzig, Linnéstraße 3, 04103, Leipzig, Germany
| | - Dirk Enke
- Institute of Chemical Technology, Universität Leipzig, Linnéstraße 3, 04103, Leipzig, Germany
| | - Martin Steinhart
- Department of Chemistry, Chemistry Osnabrück, University of Osnabrück, Barbarastraße 7, D-49076, Osnabrück, Germany
| | - Markus Haase
- Department of Chemistry, Chemistry Osnabrück, University of Osnabrück, Barbarastraße 7, D-49076, Osnabrück, Germany
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2
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Venkatesh N, Sakthivel P. Efficient degradation of azo dye pollutants on Zn doped SnO2 photocatalyst under sunlight irradiation: Performance, mechanism and toxicity evaluation. INORG CHEM COMMUN 2022. [DOI: 10.1016/j.inoche.2022.109360] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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3
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Nguyen K, Radovanovic PV. Defects and impurities in colloidal Ga2O3 nanocrystals: new opportunities for photonics and lighting. CAN J CHEM 2022. [DOI: 10.1139/cjc-2021-0203] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Defects, both native and extrinsic, critically determine functional properties of metal oxides. Gallium oxide has recently gained significant attention for its promise in microelectronics, owing to the unique combination of conductivity and high breakdown voltage, and solid-state lighting, owing to the strong photoluminescence in the visible spectral region. These properties are associated with the presence of native defects that can form both donor and acceptor states in Ga2O3. Recently, Ga2O3 nanocrystal synthesis in solution and optical glasses has been developed, allowing for a range of new applications in photonics, lighting, and photocatalysis. This review focuses on the structure and properties of Ga2O3 nanocrystals with a particular emphasis on the electronic structure and interaction of defects in reduced dimensions and their role in the observed photoluminescence properties. In addition to native defects, the effect of selected external impurities, including lanthanide and aliovalent dopants, and alloying on the emission properties of Ga2O3 nanocrystals are also discussed.
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Affiliation(s)
- Khue Nguyen
- Department of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, ON N2L 3G1, Canada
- Department of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, ON N2L 3G1, Canada
| | - Pavle V. Radovanovic
- Department of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, ON N2L 3G1, Canada
- Department of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, ON N2L 3G1, Canada
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4
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Li K, Jiang Y, Zhang R, Ren S, Feng X, Xue J, Zhang T, Zhang Z, He Z, Dai L, Wang L. Oxygen vacancy and size controlling endow tin dioxide with remarked electrocatalytic performances towards vanadium redox reactions. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2020.125073] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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5
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Roy S, Joshi AG, Chatterjee S, Ghosh AK. Local symmetry breaking in SnO 2 nanocrystals with cobalt doping and its effect on optical properties. NANOSCALE 2018; 10:10664-10682. [PMID: 29845170 DOI: 10.1039/c7nr07427a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
X-ray photoemission spectroscopy (XPS), X-ray diffraction (XRD) and transmission electron microscopy (TEM) have been used to study the structural and morphological characteristics of cobalt doped tin(iv) oxide (Sn1-xCoxO2; 0 ≤ x ≤ 0.04) nanocrystals synthesized by a chemical co-precipitation technique. Electronic structure analysis using X-ray photoemission spectroscopy (XPS) shows the formation of tin interstitials (Sni) and reduction of oxygen vacancies (VO) in the host lattice on Co doping and that the doped Co exists in mixed valence states of +2 and +3. Using XRD, the preferential position of the Sni and doped Co in the unit cell of the nanocrystals have been estimated. Rietveld refinement of XRD data shows that samples are of single phase and variation of lattice constants follows Vegard's law. XRD and TEM measurements show that the crystallite size of the nanocrystals decrease with increase in Co doping concentration. SAED patterns confirm the monocrystalline nature of the samples. The study of the lattice dynamics using Raman spectroscopy and Fourier transform infrared (FTIR) spectroscopy shows the existence of many disorder activated forbidden optical phonon modes, along with the corresponding classical modes, signifying Co induced local symmetry breaking in the nanocrystals. UV-Vis spectroscopy shows that the optical band gap has red shifted with increase in doping concentration. The study of Urbach energy confirms the increase in disorder in the nanocrystals with Co doping. Local symmetry breaking induced UV emission along with violet, blue and green luminescence has been observed from the PL study. The spectral contribution of UV emission decreases and green luminescence increases with increase in doping. Using PL, in conjunction with Raman spectroscopy, the type of oxygen vacancy induced in the nanocrystals on Co doping has been confirmed and the position of the defect levels in the forbidden zone (w.r.t. the optical band gap) has been studied.
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Affiliation(s)
- S Roy
- Materials Research Laboratory, Department of Physics, Institute of Science, Banaras Hindu University, Varanasi-221005, India.
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6
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Yin P, Tan Y, Fang H, Hegde M, Radovanovic PV. Plasmon-induced carrier polarization in semiconductor nanocrystals. NATURE NANOTECHNOLOGY 2018; 13:463-467. [PMID: 29686293 DOI: 10.1038/s41565-018-0096-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2017] [Accepted: 02/14/2018] [Indexed: 06/08/2023]
Abstract
Spintronics 1 and valleytronics 2 are emerging quantum electronic technologies that rely on using electron spin and multiple extrema of the band structure (valleys), respectively, as additional degrees of freedom. There are also collective properties of electrons in semiconductor nanostructures that potentially could be exploited in multifunctional quantum devices. Specifically, plasmonic semiconductor nanocrystals3-10 offer an opportunity for interface-free coupling between a plasmon and an exciton. However, plasmon-exciton coupling in single-phase semiconductor nanocrystals remains challenging because confined plasmon oscillations are generally not resonant with excitonic transitions. Here, we demonstrate a robust electron polarization in degenerately doped In2O3 nanocrystals, enabled by non-resonant coupling of cyclotron magnetoplasmonic modes 11 with the exciton at the Fermi level. Using magnetic circular dichroism spectroscopy, we show that intrinsic plasmon-exciton coupling allows for the indirect excitation of the magnetoplasmonic modes, and subsequent Zeeman splitting of the excitonic states. Splitting of the band states and selective carrier polarization can be manipulated further by spin-orbit coupling. Our results effectively open up the field of plasmontronics, which involves the phenomena that arise from intrinsic plasmon-exciton and plasmon-spin interactions. Furthermore, the dynamic control of carrier polarization is readily achieved at room temperature, which allows us to harness the magnetoplasmonic mode as a new degree of freedom in practical photonic, optoelectronic and quantum-information processing devices.
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Affiliation(s)
- Penghui Yin
- Department of Chemistry, University of Waterloo, Waterloo, ON, Canada
| | - Yi Tan
- Department of Chemistry, University of Waterloo, Waterloo, ON, Canada
| | - Hanbing Fang
- Department of Chemistry, University of Waterloo, Waterloo, ON, Canada
| | - Manu Hegde
- Department of Chemistry, University of Waterloo, Waterloo, ON, Canada
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Yurddaskal M, Yıldırım S, Dikici T, Yurddaskal M, Erol M, Aritman İ, Ertuğrul Uygun HD, Çelik E. EFFECTS OF Zn-DOPING ON THE PHOTOCATALYTIC ACTIVITY AND MICROSTRUCTURES OF NANOCRYSTALLINE SnO2 POWDERS. JOURNAL OF THE TURKISH CHEMICAL SOCIETY, SECTION A: CHEMISTRY 2017. [DOI: 10.18596/jotcsa.370744] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
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8
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Bouazizi N, Bargougui R, Benghnia A, Vieillard J, Ammar S, Azzouz A. Synthesis of tin oxide activated by DAN grafting and Mo nanoparticle insertion for optoelectronic properties improvement. RSC Adv 2016. [DOI: 10.1039/c6ra21017a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Tin oxide (SnO2) was synthesized via a co-precipitation method and activated by 1,5 diaminonaphthalene (DAN) grafting and molybdenum nanoparticle (Mo-NPs) incorporation for the first time as a new material.
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Affiliation(s)
- N. Bouazizi
- Nanoqam
- Department of Chemistry
- University of Quebec at Montreal
- QC
- Canada H3C 3P8
| | - R. Bargougui
- Department of Chemistry
- Faculty of Sciences
- University of Gabes
- Tunisia
| | - A. Benghnia
- Research Unit: Environment, Catalyzes and Process Analysis
- ENIG
- University of Gabes
- Tunisia
| | - J. Vieillard
- Normandie Université
- COBRA
- UMR6014 et FR3038
- Université de Rouen
- INSA de Rouen
| | - S. Ammar
- Department of Chemistry
- Faculty of Sciences
- University of Gabes
- Tunisia
| | - A. Azzouz
- Nanoqam
- Department of Chemistry
- University of Quebec at Montreal
- QC
- Canada H3C 3P8
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9
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Farvid SS, Sabergharesou T, Hutfluss LN, Hegde M, Prouzet E, Radovanovic PV. Evidence of Charge-Transfer Ferromagnetism in Transparent Diluted Magnetic Oxide Nanocrystals: Switching the Mechanism of Magnetic Interactions. J Am Chem Soc 2014; 136:7669-79. [PMID: 24835755 DOI: 10.1021/ja501888a] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Shokouh S. Farvid
- Department of Chemistry, University of Waterloo, 200 University
Avenue West, Waterloo, Ontario N2L
3G1, Canada
| | - Tahereh Sabergharesou
- Department of Chemistry, University of Waterloo, 200 University
Avenue West, Waterloo, Ontario N2L
3G1, Canada
| | - Lisa N. Hutfluss
- Department of Chemistry, University of Waterloo, 200 University
Avenue West, Waterloo, Ontario N2L
3G1, Canada
| | - Manu Hegde
- Department of Chemistry, University of Waterloo, 200 University
Avenue West, Waterloo, Ontario N2L
3G1, Canada
| | - Eric Prouzet
- Department of Chemistry, University of Waterloo, 200 University
Avenue West, Waterloo, Ontario N2L
3G1, Canada
| | - Pavle V. Radovanovic
- Department of Chemistry, University of Waterloo, 200 University
Avenue West, Waterloo, Ontario N2L
3G1, Canada
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10
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Peche-Herrero MA, Maestre D, Ramírez-Castellanos J, Cremades A, Piqueras J, González-Calbet JM. The controlled transition-metal doping of SnO2 nanoparticles with tunable luminescence. CrystEngComm 2014. [DOI: 10.1039/c3ce42188k] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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11
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Yang Z, Gao D, Zhu Z, Zhang J, Shi Z, Zhang Z, Xue D. Ferromagnetism in sphalerite and wurtzite CdS nanostructures. NANOSCALE RESEARCH LETTERS 2013; 8:17. [PMID: 23294671 PMCID: PMC3577620 DOI: 10.1186/1556-276x-8-17] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/27/2012] [Accepted: 12/22/2012] [Indexed: 06/01/2023]
Abstract
Room-temperature ferromagnetism is observed in undoped sphalerite and wurtzite CdS nanostructures which are synthesized by hydrothermal methods. Scanning electron microscopy and transmission electron microscopy results indicate that the sphalerite CdS samples show a spherical-like shape and the wurtzite CdS ones show a flower-like shape, both of which are aggregated by lots of smaller particles. The impurity of the samples has been ruled out by the results of X-ray diffraction, selected-area electron diffraction, and X-ray photoelectron spectroscopy. Magnetization measurements indicate that all the samples exhibit room-temperature ferromagnetism and the saturation magnetization decreases with the increased crystal sizes, revealing that the observed ferromagnetism is defect-related, which is also confirmed by the post-annealing processes. This finding in CdS should be the focus of future electronic and spintronic devices.
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Affiliation(s)
- Zhaolong Yang
- Key Laboratory for Magnetism and Magnetic Materials of MOE, Lanzhou University, Lanzhou, 730000, People’s Republic of China
| | - Daqiang Gao
- Key Laboratory for Magnetism and Magnetic Materials of MOE, Lanzhou University, Lanzhou, 730000, People’s Republic of China
| | - Zhonghua Zhu
- Key Laboratory for Magnetism and Magnetic Materials of MOE, Lanzhou University, Lanzhou, 730000, People’s Republic of China
| | - Jing Zhang
- Key Laboratory for Magnetism and Magnetic Materials of MOE, Lanzhou University, Lanzhou, 730000, People’s Republic of China
| | - Zhenhua Shi
- Key Laboratory for Magnetism and Magnetic Materials of MOE, Lanzhou University, Lanzhou, 730000, People’s Republic of China
| | - Zhipeng Zhang
- Key Laboratory for Magnetism and Magnetic Materials of MOE, Lanzhou University, Lanzhou, 730000, People’s Republic of China
| | - Desheng Xue
- Key Laboratory for Magnetism and Magnetic Materials of MOE, Lanzhou University, Lanzhou, 730000, People’s Republic of China
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12
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Ghosh S, Das K, Chakrabarti K, De SK. Effect of oleic acidligand on photophysical, photoconductive and magnetic properties of monodisperse SnO2quantum dots. Dalton Trans 2013; 42:3434-46. [DOI: 10.1039/c2dt31764h] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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13
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Ju L, Sabergharesou T, Stamplecoskie KG, Hegde M, Wang T, Combe NA, Wu H, Radovanovic PV. Interplay between Size, Composition, and Phase Transition of Nanocrystalline Cr3+-Doped BaTiO3 as a Path to Multiferroism in Perovskite-Type Oxides. J Am Chem Soc 2011; 134:1136-46. [PMID: 22239686 DOI: 10.1021/ja2091678] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ling Ju
- Department of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, Ontario,
Canada N2L 3G1
| | - Tahereh Sabergharesou
- Department of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, Ontario,
Canada N2L 3G1
| | - Kevin G. Stamplecoskie
- Department of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, Ontario,
Canada N2L 3G1
| | - Manu Hegde
- Department of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, Ontario,
Canada N2L 3G1
| | - Ting Wang
- Department of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, Ontario,
Canada N2L 3G1
| | - Nicole A. Combe
- Department of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, Ontario,
Canada N2L 3G1
| | - Hongyu Wu
- Department of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, Ontario,
Canada N2L 3G1
| | - Pavle V. Radovanovic
- Department of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, Ontario,
Canada N2L 3G1
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14
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Abd El-sadek M, Babu SM. A controlled approach for synthesizing CdTe@CrOOH (core-shell) composite nanoparticles. CURRENT APPLIED PHYSICS 2011; 11:926-932. [DOI: 10.1016/j.cap.2010.12.022] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
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15
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Farvid SS, Wang T, Radovanovic PV. Colloidal Gallium Indium Oxide Nanocrystals: A Multifunctional Light-Emitting Phosphor Broadly Tunable by Alloy Composition. J Am Chem Soc 2011; 133:6711-9. [PMID: 21476551 DOI: 10.1021/ja111514u] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Shokouh S. Farvid
- Department of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada
| | - Ting Wang
- Department of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada
| | - Pavle V. Radovanovic
- Department of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada
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16
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Carty A, Yeow J. In It to WIN It. IEEE NANOTECHNOLOGY MAGAZINE 2010. [DOI: 10.1109/mnano.2010.938651] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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