1
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Liu Y, Zheng T, Zhang X, Chen C. Preparation of ZnGa 2O 4 nanoflowers and their full-color luminescence properties. Sci Rep 2023; 13:14430. [PMID: 37660085 PMCID: PMC10475037 DOI: 10.1038/s41598-023-41658-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2023] [Accepted: 08/29/2023] [Indexed: 09/04/2023] Open
Abstract
Gallate material, a luminescent matrix with excellent performance is normally prepared by vapor deposition or solid phase sintering method at high temperature. However, it has not been solved to prepare gallate-based fluorescent materials with full-color luminescent properties at low temperature. In this paper, ZnGa2O4 undoped or doped with Cr or Mn nanoflowers composed of nanosheet-level structure were prepared by hydrothermal method at low temperature. Under ultraviolet light irradiation, ZnGa2O4, ZnGa2O4:Mn2+ and ZnGa2O4:Cr3+ display three primary colors of blue, green and red luminescence through self-excitation, Mn2+ and Cr3+ excitation respectively. The solid fluorescence yields of blue, green, and red colors are 32.3, 36.5, and 40.7%, respectively. It is highly expected to be applied to color display, biological imaging, white light devices.
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Affiliation(s)
- Yan Liu
- Department of Pharmacy, Shandong University of Traditional Chinese Medicine, Jinan, 250355, Shandong, China
| | - Tingting Zheng
- Department of Pharmacy, Shandong University of Traditional Chinese Medicine, Jinan, 250355, Shandong, China.
| | - Xiuyun Zhang
- Department of Pharmacy, Shandong University of Traditional Chinese Medicine, Jinan, 250355, Shandong, China.
| | - Chen Chen
- Key Laboratory of New Material Research Institute, Department of Acupuncture-Moxibustion and Tuina, Shandong University of Traditional Chinese Medicine, Jinan, 250355, China.
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2
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García-Carrión M, Ramírez-Castellanos J, Nogales E, Méndez B. Temperature-Dependent and Time-Resolved Luminescence Characterization of γ-Ga 2O 3 Nanoparticles. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:nano13091445. [PMID: 37176990 PMCID: PMC10180148 DOI: 10.3390/nano13091445] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Revised: 04/21/2023] [Accepted: 04/21/2023] [Indexed: 05/15/2023]
Abstract
The temperature-dependent luminescence properties of γ-Ga2O3 nanoparticles prepared by a precipitation method are investigated under steady-state and pulsed-light excitation. The main photoluminescence (PL) emission at room temperature consists of a single blue band centered around 2.76 eV, which hardly undergoes a blueshift of 0.03 eV when temperature goes down to 4 K. The emission behaves with a positive thermal quenching following an Arrhenius-type curve. The data fitting yields two non-radiative levels affecting the emission band with activation energies of 7 meV and 40 meV. On the other hand, time-resolved PL measurements have also been taken and studied as a function of the temperature. The data analysis has resulted in two lifetimes: one of 3.4 ns and the other of 32 ns at room temperature, which undergo an increase up to 4.5 ns and 65 ns at T = 4 K, respectively. Based on both stationary and dynamic PL results, a model of radiative and non-radiative levels associated with the main emission bands of γ-Ga2O3 is suggested. Finally, by using PL excitation measurements, an estimation of the bandgap and its variation with temperature between 4 K and room temperature were obtained and assessed against O'Donnell-Chen's law. With this variation it has been possible to calculate the average of the phonon energy, resulting in ⟨ħω⟩ = 10 ± 1 meV.
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Affiliation(s)
- Marina García-Carrión
- Department of Materials Physics, Faculty of Physical Sciences, University Complutense of Madrid, E-28040 Madrid, Spain
| | - Julio Ramírez-Castellanos
- Department of Inorganic Chemistry, Faculty of Chemical Sciences, University Complutense of Madrid, E-28040 Madrid, Spain
| | - Emilio Nogales
- Department of Materials Physics, Faculty of Physical Sciences, University Complutense of Madrid, E-28040 Madrid, Spain
| | - Bianchi Méndez
- Department of Materials Physics, Faculty of Physical Sciences, University Complutense of Madrid, E-28040 Madrid, Spain
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3
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Das D, Gutierrez G, Ramana CV. Raman Spectroscopic Characterization of Chemical Bonding and Phase Segregation in Tin (Sn)-Incorporated Ga 2O 3. ACS OMEGA 2023; 8:11709-11716. [PMID: 37033848 PMCID: PMC10077454 DOI: 10.1021/acsomega.2c05047] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/07/2022] [Accepted: 11/21/2022] [Indexed: 06/19/2023]
Abstract
Using detailed Raman scattering analyses, the effect of tin (Sn) incorporation on the crystal structure, chemical bonding/inhomogeneity, and single-phase versus multiphase formation of gallium oxide (Ga2O3) compounds is reported. The Raman characterization of the Sn-mixed Ga2O3 polycrystalline compounds (0.00 ≤ x ≤ 0.30), which were produced by the high-temperature solid-state synthesis method, indicated that the Sn-induced changes in the chemical bonding and phase segregation were significant. Furthermore, the evolution of Sn-O bonds with increasing Sn concentration (x) was confirmed. While the monoclinic β-Ga2O3 was unperturbed for lower x values, Raman spectra revealed the nucleation of a composite with a distinct SnO2 secondary phase. A higher Sn content led to the formation of a Ga-Sn-O + SnO2 mixed phase compound, which was reflected in shifts in the high-frequency stretching and bending of the GaO4 tetrahedra that structurally formed the β-Ga2O3 phase. Thus, a chemical composition/phase/chemical bonding correlation was established for the Sn-incorporated Ga2O3 compounds.
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Affiliation(s)
- Debabrata Das
- Center
for Advanced Materials Research (CMR), University
of Texas at El Paso, 500 W University Ave, El Paso, Texas79968, United
States
| | - Guillermo Gutierrez
- Center
for Advanced Materials Research (CMR), University
of Texas at El Paso, 500 W University Ave, El Paso, Texas79968, United
States
- Department
of Mechanical Engineering, University of
Texas at El Paso, 500 W University Ave, El Paso, Texas79968, United
States
| | - C. V. Ramana
- Center
for Advanced Materials Research (CMR), University
of Texas at El Paso, 500 W University Ave, El Paso, Texas79968, United
States
- Department
of Mechanical Engineering, University of
Texas at El Paso, 500 W University Ave, El Paso, Texas79968, United
States
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4
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Gao L, Han D, Wang Z, Gu F. Metal-organic framework MIL-68(In)-NH2-derived carbon-covered cobalt-doped bi-crystalline In2O3 tubular structures for efficient photocatalytic degradation of tetracycline hydrochloride. Colloids Surf A Physicochem Eng Asp 2023. [DOI: 10.1016/j.colsurfa.2023.130931] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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5
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Duan L, Zhang Y, Zhao J, Zhang J, Li Q, Lu Q, Fu L, Liu J, Liu Q. Unique Surface Fluorescence Induced from the Core-Shell Structure of Gallium-Based Liquid Metals Prepared by Thermal Oxidation Processing. ACS APPLIED MATERIALS & INTERFACES 2022; 14:39654-39664. [PMID: 35979950 DOI: 10.1021/acsami.2c12420] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Liquid metals (LMs) have emerged as promising functional materials that combine the properties of both liquid and metal. These characteristics enabled them to find applications in many fields. However, the LMs usually can only display a silver-white physical appearance, which limits their further applications in the fields with the imposition of stringent requirements for color and aesthetics. Herein, we report that the surface of LMs was transformed directly from metal to fluorescent semiconductor layer by an example of eutectic GaInSn (eGaInSn) induced by thermal oxidation. Specifically, a core-shell structure is formed from the fluorescent layer and the LMs. The shell endows the LMs with fluorescence without affecting their interior fluidity and conductivity. In particular, the formation process as well as the degree of crystallization, phase transformation, and light emission of the fluorescent oxide shell on the surface of LMs is regulated by the component content. A thorough analysis of surface morphology, composition, structure, and properties of the fluorescent shell suggests that the Ga2O3 layer is formed on the surface of gallium-based LMs after their immersion in deionized water. Subsequently, thermal oxidation results in the formation of the β-Ga2O3 shell on the surface of liquid metals. Importantly, abundant oxygen vacancies (VO) in β-Ga2O3 as the donors and the gallium vacancies (VGa), gallium-oxygen vacancy pairs (VO-VGa), defect energy levels, and intrinsic defects as the acceptors enabled the light emission. The fluorescent LMs have promising potential for flexible lighting and displays, anticounterfeiting measures, sensing, and chameleon robots.
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Affiliation(s)
- Liangfei Duan
- Yunnan Key Laboratory for Micro/Nano Materials & Technology, International Joint Research Center for Optoelectronic and Energy Materials, School of Materials and Energy, Yunnan University, Kunming 650091, China
| | - Yumin Zhang
- Yunnan Key Laboratory for Micro/Nano Materials & Technology, International Joint Research Center for Optoelectronic and Energy Materials, School of Materials and Energy, Yunnan University, Kunming 650091, China
| | - Jianhong Zhao
- Yunnan Key Laboratory for Micro/Nano Materials & Technology, International Joint Research Center for Optoelectronic and Energy Materials, School of Materials and Energy, Yunnan University, Kunming 650091, China
| | - Jin Zhang
- Yunnan Key Laboratory for Micro/Nano Materials & Technology, International Joint Research Center for Optoelectronic and Energy Materials, School of Materials and Energy, Yunnan University, Kunming 650091, China
| | - Qian Li
- CAS Key Laboratory of Cryogenics and Beijing Key Laboratory of Cryo- Biomedical Engineering, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Qingjie Lu
- Yunnan Key Laboratory for Micro/Nano Materials & Technology, International Joint Research Center for Optoelectronic and Energy Materials, School of Materials and Energy, Yunnan University, Kunming 650091, China
| | - Li Fu
- Yunnan Key Laboratory for Micro/Nano Materials & Technology, International Joint Research Center for Optoelectronic and Energy Materials, School of Materials and Energy, Yunnan University, Kunming 650091, China
| | - Jing Liu
- CAS Key Laboratory of Cryogenics and Beijing Key Laboratory of Cryo- Biomedical Engineering, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- Department of Biomedical Engineering School of Medicine Tsinghua University, Beijing 100084, China
| | - Qingju Liu
- Yunnan Key Laboratory for Micro/Nano Materials & Technology, International Joint Research Center for Optoelectronic and Energy Materials, School of Materials and Energy, Yunnan University, Kunming 650091, China
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6
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Sun X, Abdurahman R, Chu G, Yang Q, Yang T. Development of Ca
2+
, Cr
3+
Co‐Doped and Pr
3+
, Ca
2+
, Cr
3+
Tri‐Doped β‐Ga
2
O
3
Persistent Luminescence Nanoparticles with Enhanced Luminescence. ChemistrySelect 2022. [DOI: 10.1002/slct.202103640] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Xue‐Feng Sun
- Laboratory of Xinjiang Native Medicinal and Edible Plant Resources Chemistry College of Chemistry and Environmental Science Kashi University Kashi China
| | - Renagul Abdurahman
- Laboratory of Xinjiang Native Medicinal and Edible Plant Resources Chemistry College of Chemistry and Environmental Science Kashi University Kashi China
| | - Gang‐Hui Chu
- Laboratory of Xinjiang Native Medicinal and Edible Plant Resources Chemistry College of Chemistry and Environmental Science Kashi University Kashi China
| | - Qian‐Ting Yang
- Laboratory of Xinjiang Native Medicinal and Edible Plant Resources Chemistry College of Chemistry and Environmental Science Kashi University Kashi China
| | - Tong‐Sheng Yang
- Laboratory of Xinjiang Native Medicinal and Edible Plant Resources Chemistry College of Chemistry and Environmental Science Kashi University Kashi China
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7
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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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8
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Shi F, Qiao H. Preparations, properties and applications of gallium oxide nanomaterials – A review. NANO SELECT 2021. [DOI: 10.1002/nano.202100149] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Affiliation(s)
- Feng Shi
- Key Laboratory of Processing and Testing Technology of Glass & Functional Ceramics of Shandong Province, School of Materials Science and Engineering Qilu University of Technology (Shandong Academy of Sciences) Jinan China
- School of Material Science & Engineering Shandong University of Science and Technology Qingdao China
| | - Hengyang Qiao
- School of Material Science & Engineering Shandong University of Science and Technology Qingdao China
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9
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Zade V, Makeswaran N, Boyce BL, Paraguay-Delgado F, Ramana CV. Structural and mechanical properties of nanocrystalline Ga2O3 films made by pulsed laser deposition onto transparent quartz substrates. NANO EXPRESS 2021. [DOI: 10.1088/2632-959x/abf3d3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Abstract
This work reports on the correlation between structure, surface/interface morphology and mechanical properties of pulsed laser deposited (PLD) β-Ga2O3 films on transparent quartz substrates. By varying the deposition temperature in the range of 25 °C–700 °C, ∼200 nm thick Ga2O3 films with variable microstructure and amorphous-to-nanocrystalline nature were produced onto quartz substrates by PLD. The Ga2O3 films deposited at room temperature were amorphous; nanocrystalline Ga2O3 films were realized at 700 °C. The interface microstructure is characterized with a typical nano-columnar morphology while the surface exhibits the uniform granular morphology. Corroborating with structure and surface/interface morphology, and with increasing deposition temperature, tunable mechanical properties were seen in PLD Ga2O3 films. At 700 °C, for nanocrystalline Ga2O3 films, the dense grain packing reduces the elastic modulus Er while improving the hardness. The improved crystallinity at elevated temperatures coupled with nanocrystallinity, the β-phase stabilization is accounted for the observed enhancement in the mechanical properties of PLD Ga2O3 films. The structure-morphology-mechanical property correlation in nanocrystalline PLD β-Ga2O3 films deposited on quartz substrates is discussed in detail.
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10
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Integrated Photodetectors Based on Group IV and Colloidal Semiconductors: Current State of Affairs. MICROMACHINES 2020; 11:mi11090842. [PMID: 32911711 PMCID: PMC7569792 DOI: 10.3390/mi11090842] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/10/2020] [Revised: 09/03/2020] [Accepted: 09/05/2020] [Indexed: 11/16/2022]
Abstract
With the aim to take advantage from the existing technologies in microelectronics, photodetectors should be realized with materials compatible with them ensuring, at the same time, good performance. Although great efforts are made to search for new materials that can enhance performance, photodetector (PD) based on them results often expensive and difficult to integrate with standard technologies for microelectronics. For this reason, the group IV semiconductors, which are currently the main materials for electronic and optoelectronic devices fabrication, are here reviewed for their applications in light sensing. Moreover, as new materials compatible with existing manufacturing technologies, PD based on colloidal semiconductor are revised. This work is particularly focused on developments in this area over the past 5-10 years, thus drawing a line for future research.
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11
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Zhang Y, Jia C, Kong Q, Fan N, Chen G, Guan H, Dong C. ZnO-Decorated In/Ga Oxide Nanotubes Derived from Bimetallic In/Ga MOFs for Fast Acetone Detection with High Sensitivity and Selectivity. ACS APPLIED MATERIALS & INTERFACES 2020; 12:26161-26169. [PMID: 32391681 DOI: 10.1021/acsami.0c04580] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The development of acetone gas sensors is desirable but challenging for both air quality monitoring and medical diagnosis. Herein, starting from bimetallic In/Ga metal-organic frameworks (MOFs) (MIL-68 (In/Ga)), a facile strategy is proposed to couple with zinc ions to design In/Ga oxide (IGO)@ZnO core-shell nanotubes for efficient acetone detection. In such a heterostructure, tiny ZnO nanoparticles are closely decorated on IGO nanotubes, which is beneficial to enlarge the specific surface area and create rich oxygen vacancies and heterojunction interfaces. Benefiting from the structural merits and synergetic effects, the IGO@ZnO-based gas sensor exhibits a low detection limitation (200 ppb), a high response, good linearity relationship between the sensing responses and wide testing acetone concentrations, and fast response and recovery time (6.8/6.1 s) with good selectivity and stability. These sensing performances strongly indicate the practical application to quantitatively detect acetone.
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Affiliation(s)
- Yanlin Zhang
- School of Materials and Energy, Yunnan University, 650091 Kunming, Peoples' Republic of China
| | - Chaowei Jia
- School of Materials and Energy, Yunnan University, 650091 Kunming, Peoples' Republic of China
| | - Quan Kong
- School of Materials and Energy, Yunnan University, 650091 Kunming, Peoples' Republic of China
| | - Nanyu Fan
- School of Materials and Energy, Yunnan University, 650091 Kunming, Peoples' Republic of China
| | - Gang Chen
- School of Materials and Energy, Yunnan University, 650091 Kunming, Peoples' Republic of China
| | - Hongtao Guan
- School of Materials and Energy, Yunnan University, 650091 Kunming, Peoples' Republic of China
| | - Chengjun Dong
- School of Materials and Energy, Yunnan University, 650091 Kunming, Peoples' Republic of China
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12
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Ma J, Lin J, Liu J, Li F, Liu Y, Yang G. Achieving high conductivity p-type Ga2O3 through Al-N and In-N co-doping. Chem Phys Lett 2020. [DOI: 10.1016/j.cplett.2020.137308] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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13
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Zheng Y, Fan M, Li K, Zhang R, Li X, Zhang L, Qiao ZA. Ultraviolet-induced Ostwald ripening strategy towards a mesoporous Ga2O3/GaOOH heterojunction composite with a controllable structure for enhanced photocatalytic hydrogen evolution. Catal Sci Technol 2020. [DOI: 10.1039/d0cy00303d] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
The design of efficient semiconductor oxide materials with heterojunction nanostructures for photocatalysis holds great promise in the fields of clean energy conversion and storage.
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Affiliation(s)
- Yuenan Zheng
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry
- International Joint Research Laboratory of Nano-Micro Architecture Chemistry
- College of Chemistry
- Jilin University
- Changchun 130012
| | - Meihong Fan
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry
- International Joint Research Laboratory of Nano-Micro Architecture Chemistry
- College of Chemistry
- Jilin University
- Changchun 130012
| | - Kaiqian Li
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry
- International Joint Research Laboratory of Nano-Micro Architecture Chemistry
- College of Chemistry
- Jilin University
- Changchun 130012
| | - Rui Zhang
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry
- International Joint Research Laboratory of Nano-Micro Architecture Chemistry
- College of Chemistry
- Jilin University
- Changchun 130012
| | - Xuefeng Li
- Alan G. MacDiarmid Institute
- College of Chemistry
- Jilin University
- Changchun 130012
- China
| | - Ling Zhang
- State Key Laboratory of Supramolecular Structure and Materials
- College of Chemistry
- Jilin University
- Changchun 130012
- China
| | - Zhen-An Qiao
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry
- International Joint Research Laboratory of Nano-Micro Architecture Chemistry
- College of Chemistry
- Jilin University
- Changchun 130012
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14
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Zhang X, Zhang Z, Huang H, Wang Y, Tong N, Lin J, Liu D, Wang X. Oxygen vacancy modulation of two-dimensional γ-Ga 2O 3 nanosheets as efficient catalysts for photocatalytic hydrogen evolution. NANOSCALE 2018; 10:21509-21517. [PMID: 30427361 DOI: 10.1039/c8nr07186a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Controlling the creation of oxygen vacancies can effectively regulate the optical and electronic properties of metal oxide nanomaterials. Over the past several decades, numerous metal oxides with oxygen vacancies have been developed. However, an investigation about oxygen vacancies leading to the formation of nanosheets with different thicknesses has not been available up to now. Here, we report the oxygen vacancy modulated formation of γ-Ga2O3 nanosheets and demonstrate that the thickness of the nanosheets is not the decisive factor in the photocatalytic hydrogen evolution reaction of ultrathin 2D nanosheets. Detailed structural characterization indicated that γ-Ga2O3 prepared at 160 °C (γ-160) with a morphology of ultrathin nanosheets possesses the highest oxygen vacancy concentration and an optimal thickness of the nanosheets. The enhanced photocatalytic performance could be determined from the synergistic effects between the ultrathin 2D structure and the O-vacancies confined in the ultrathin nanosheets. This work provides an efficient strategy to regulate the formation of nanosheets at the atomic scale and enrich the study on the effect of oxygen vacancies in the photocatalytic water splitting reaction.
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Affiliation(s)
- Xiaoyan Zhang
- College of Chemical Engineering and Materials Science, Quanzhou Normal University, Quanzhou, 362000, Fujian Province, P. R. China.
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15
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Zhang X, Huang H, Zhang Y, Liu D, Tong N, Lin J, Chen L, Zhang Z, Wang X. Phase Transition of Two-Dimensional β-Ga 2O 3 Nanosheets from Ultrathin γ-Ga 2O 3 Nanosheets and Their Photocatalytic Hydrogen Evolution Activities. ACS OMEGA 2018; 3:14469-14476. [PMID: 31458132 PMCID: PMC6645061 DOI: 10.1021/acsomega.8b01964] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/09/2018] [Accepted: 10/22/2018] [Indexed: 06/10/2023]
Abstract
Monoclinic β-Ga2O3 nanosheets hold great potential applications in electronic, optical, and photocatalytic fields. In this study, two-dimensional β-Ga2O3 nanosheets were successfully fabricated through a simple crystalline phase transition from the as-prepared ultrathin γ-Ga2O3 nanosheets. The photocatalytic hydrogen evolution reaction under UV light irradiation was achieved on the two kinds of photocatalysts. However, β-Ga2O3 with a higher crystallinity shows a lower photocatalytic activity in comparison with γ-Ga2O3. The average apparent quantum yield is calculated to be 0.29% for β-Ga2O3 nanosheets and 1.82% for γ-Ga2O3. More efficient separation and transfer rates of photogenerated carriers and larger specific areas were found in γ-Ga2O3. On the basis of the analysis of the structures of γ-Ga2O3 and β-Ga2O3, it is proposed that the disordered or defective structure contributes to the improvement of photocatalytic activity to some extent. Therefore, it is significant to develop the photocatalyst with a stable structure and a certain number of defects at the same time.
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Affiliation(s)
- Xiaoyan Zhang
- College
of Chemical Engineering and Materials Science, Quanzhou Normal University, Quanzhou, 362000 Fujian Province, P. R. China
| | - Huijuan Huang
- State
Key Laboratory of Photocatalysis on Energy and Environment, College
of Chemistry, Fuzhou University, Fuzhou 350002, P. R. China
| | - Yingguang Zhang
- State
Key Laboratory of Photocatalysis on Energy and Environment, College
of Chemistry, Fuzhou University, Fuzhou 350002, P. R. China
| | - Dan Liu
- State
Key Laboratory of Photocatalysis on Energy and Environment, College
of Chemistry, Fuzhou University, Fuzhou 350002, P. R. China
| | - Na Tong
- State
Key Laboratory of Photocatalysis on Energy and Environment, College
of Chemistry, Fuzhou University, Fuzhou 350002, P. R. China
| | - Jinjin Lin
- State
Key Laboratory of Photocatalysis on Energy and Environment, College
of Chemistry, Fuzhou University, Fuzhou 350002, P. R. China
| | - Lu Chen
- State
Key Laboratory of Photocatalysis on Energy and Environment, College
of Chemistry, Fuzhou University, Fuzhou 350002, P. R. China
| | - Zizhong Zhang
- State
Key Laboratory of Photocatalysis on Energy and Environment, College
of Chemistry, Fuzhou University, Fuzhou 350002, P. R. China
| | - Xuxu Wang
- State
Key Laboratory of Photocatalysis on Energy and Environment, College
of Chemistry, Fuzhou University, Fuzhou 350002, P. R. China
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16
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Jin S, Lu W, Stanish PC, Radovanovic PV. Compositional control of the photocatalytic activity of Ga2O3 nanocrystals enabled by defect-induced carrier trapping. Chem Phys Lett 2018. [DOI: 10.1016/j.cplett.2018.06.046] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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17
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Fernandes B, Hegde M, Stanish PC, Mišković ZL, Radovanovic PV. Photoluminescence decay dynamics in γ-Ga2O3 nanocrystals: The role of exclusion distance at short time scales. Chem Phys Lett 2017. [DOI: 10.1016/j.cplett.2017.06.052] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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18
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Paleari A, Golubev NV, Ignat'eva ES, Sigaev VN, Monguzzi A, Lorenzi R. Donor-Acceptor Control in Grown-in-Glass Gallium Oxide Nanocrystals by Crystallization-driven Heterovalent Doping. Chemphyschem 2017; 18:662-669. [PMID: 28067460 DOI: 10.1002/cphc.201601247] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2016] [Revised: 01/04/2017] [Indexed: 11/07/2022]
Abstract
Incorporation of doping ions in nanocrystals is a strategy for providing nanophases with functions directly related to ion features. At the nanoscale, however, doping can also activate more complex effects mediated by perturbation of the nanophase size and structure. Here, we report a paradigmatic case in which we modify grown-in-glass γ-Ga2 O3 nanophases by nickel or titanium doping of the starting glass, so as to control the concentration of oxygen and gallium vacancies responsible for the light emission. Optical absorption and luminescence show that Ni2+ and Ti4+ ions enter into the nanophase, but differential scanning calorimetry and X-ray diffraction indicate that Ni and Ti also work as modifiers of nanocrystal growth. As a result, doping influences nanocrystal size and concentration, which in turn dictate the number of donors and acceptors per nanocrystal. Finally, the chain of effects turns out to control both the intensity and spectral distribution of the light emission.
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Affiliation(s)
- Alberto Paleari
- Department of Materials Science, University of Milano-Bicocca, via R. Cozzi 55, 20125, Milano, Italy.,P.D. Sarkisov Int. Laboratory of Glass-based Functional Materials, Mendeleev University of Chemical Technology of Russia, Miusskaya Square 9, 125190, Moscow, Russia
| | - Nikita V Golubev
- P.D. Sarkisov Int. Laboratory of Glass-based Functional Materials, Mendeleev University of Chemical Technology of Russia, Miusskaya Square 9, 125190, Moscow, Russia
| | - Elena S Ignat'eva
- P.D. Sarkisov Int. Laboratory of Glass-based Functional Materials, Mendeleev University of Chemical Technology of Russia, Miusskaya Square 9, 125190, Moscow, Russia
| | - Vladimir N Sigaev
- P.D. Sarkisov Int. Laboratory of Glass-based Functional Materials, Mendeleev University of Chemical Technology of Russia, Miusskaya Square 9, 125190, Moscow, Russia
| | - Angelo Monguzzi
- Department of Materials Science, University of Milano-Bicocca, via R. Cozzi 55, 20125, Milano, Italy
| | - Roberto Lorenzi
- Department of Materials Science, University of Milano-Bicocca, via R. Cozzi 55, 20125, Milano, Italy
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Chen H, Hu J, Li GD, Gao Q, Wei C, Zou X. Porous Ga-In Bimetallic Oxide Nanofibers with Controllable Structures for Ultrasensitive and Selective Detection of Formaldehyde. ACS APPLIED MATERIALS & INTERFACES 2017; 9:4692-4700. [PMID: 28084720 DOI: 10.1021/acsami.6b13520] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
The design of appropriate composite materials with unique surface structures is an important strategy to achieve ideal chemical gas sensing. In this paper, efficient and selective detection of formaldehyde vapor has been realized by a gas sensor based on porous GaxIn2-xO3 nanofibers assembled by small building blocks. By tuning the Ga/In atomic ratios in the materials, crystallite phase, nanostructure, and band gap of as-obtained GaxIn2-xO3 nanofibers can be rationally altered. This further offers a good opportunity to optimize the gas sensing performances. In particular, the sensor based on porous Ga0.6In1.4O3 nanofibers assembled by small nanoparticles (∼4.6 nm) exhibits best sensing performances. Toward 100 ppm formaldehyde, its highest response (Ra/Rg = 52.4, at 150 °C) is ∼4 times higher than that of the pure In2O3 (Ra/Rg = 13.0, at 200 °C). Meanwhile, it has superior ability to selectively detect formaldehyde against other interfering volatile organic compound gases. The significantly improved sensing performance makes the Ga0.6In1.4O3 sensor very promising for selective detection of formaldehyde.
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Affiliation(s)
- Hui Chen
- Key Laboratory of Automobile Materials, Ministry of Education, College of Materials Science and Engineering, Jilin University , Changchun 130025, P. R. China
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University , Changchun 130012, P. R. China
| | - Jiabo Hu
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University , Changchun 130012, P. R. China
| | - Guo-Dong Li
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University , Changchun 130012, P. R. China
| | - Qian Gao
- Key Laboratory of Automobile Materials, Ministry of Education, College of Materials Science and Engineering, Jilin University , Changchun 130025, P. R. China
| | - Cundi Wei
- Key Laboratory of Automobile Materials, Ministry of Education, College of Materials Science and Engineering, Jilin University , Changchun 130025, P. R. China
| | - Xiaoxin Zou
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University , Changchun 130012, P. R. China
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20
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Zhu SC, Guan SH, Liu ZP. Mechanism and microstructures in Ga2O3 pseudomartensitic solid phase transition. Phys Chem Chem Phys 2016; 18:18563-74. [PMID: 27344965 DOI: 10.1039/c6cp03673b] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Solid-to-solid phase transition, although widely exploited in making new materials, challenges persistently our current theory for predicting its complex kinetics and rich microstructures in transition. The Ga2O3α-β phase transformation represents such a common but complex reaction with marked change in cation coordination and crystal density, which was known to yield either amorphous or crystalline products under different synthetic conditions. Here we, via recently developed stochastic surface walking (SSW) method, resolve for the first time the atomistic mechanism of Ga2O3α-β phase transformation, the pathway of which turns out to be the first reaction pathway ever determined for a new type of diffusionless solid phase transition, namely, pseudomartensitic phase transition. We demonstrate that the sensitivity of product crystallinity is caused by its multi-step, multi-type reaction pathway, which bypasses seven intermediate phases and involves all types of elementary solid phase transition steps, i.e. the shearing of O layers (martensitic type), the local diffusion of Ga atoms (reconstructive type) and the significant lattice dilation (dilation type). While the migration of Ga atoms across the close-packed O layers is the rate-determining step and yields "amorphous-like" high energy intermediates, the shearing of O layers contributes to the formation of coherent biphase junctions and the presence of a crystallographic orientation relation, (001)α//(201[combining macron])β + [120]α//[13[combining macron]2]β. Our experiment using high-resolution transmission electron microscopy further confirms the theoretical predictions on the atomic structure of biphase junction and the formation of (201[combining macron])β twin, and also discovers the late occurrence of lattice expansion in the nascent β phase that grows out from the parent α phase. By distinguishing pseudomartensitic transition from other types of mechanisms, we propose general rules to predict the product crystallinity of solid phase transition. The new knowledge on the kinetics of pseudomartensitic transition complements the theory of diffusionless solid phase transition.
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Affiliation(s)
- Sheng-Cai Zhu
- Collaborative Innovation Center of Chemistry for Energy Material, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Key Laboratory of Computational Physical Science (Ministry of Education), Department of Chemistry, Fudan University, Shanghai 200433, China.
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21
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Lin H, Liu Y, Zhou LJ, Zhao HJ, Chen L. Strong Infrared NLO Tellurides with Multifunction: CsXII4In5Te12 (XII = Mn, Zn, Cd). Inorg Chem 2016; 55:4470-5. [DOI: 10.1021/acs.inorgchem.6b00254] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hua Lin
- Key Laboratory of
Optoelectronic Materials Chemistry and Physics, Fujian Institute of
Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, People’s Republic of China
| | - Yi Liu
- State Key
Laboratory of Silicon Materials, Department of Materials Science and
Engineering, Zhejiang University, Hangzhou 310027, People’s Republic of China
| | - Liu-Jiang Zhou
- Bremen Center
for Computational Materials Science, University of Bremen, Am Falturm
1, 28359 Bremen, Germany
| | - Hua-Jun Zhao
- School of Chemistry and Chemical Engineering, Zunyi Normal College, Zunyi, Guizhou 563002, People’s Republic of China
| | - Ling Chen
- Key Laboratory of
Optoelectronic Materials Chemistry and Physics, Fujian Institute of
Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, People’s Republic of China
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22
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Ghodsi V, Layek A, Hegde M, Yildirim B, Radovanovic PV. Native defects determine phase-dependent photoluminescence behavior of Eu(2+) and Eu(3+) in In2O3 nanocrystals. Chem Commun (Camb) 2016; 52:4353-6. [PMID: 26924607 DOI: 10.1039/c6cc01122e] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We demonstrate the coexistence of Eu(2+) and Eu(3+) in corundum and bixbyite-type colloidal In2O3 nanocrystals. The emission properties of dopants in both oxidation states are determined by their interaction with native defects, and are dramatically different in the two nanocrystal phases. This difference arises from the smaller nanocrystal size and higher defect density in metastable corundum-type nanocrystals.
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Affiliation(s)
- Vahid Ghodsi
- Department of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, ON N2L 3G1, Canada.
| | - Arunasish Layek
- Department of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, ON N2L 3G1, Canada.
| | - Manu Hegde
- Department of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, ON N2L 3G1, Canada.
| | - Baran Yildirim
- 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.
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23
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Energy Transfer between Conjugated Colloidal Ga₂O₃ and CdSe/CdS Core/Shell Nanocrystals for White Light Emitting Applications. NANOMATERIALS 2016; 6:nano6020032. [PMID: 28344289 PMCID: PMC5302483 DOI: 10.3390/nano6020032] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/31/2015] [Revised: 01/21/2016] [Accepted: 02/04/2016] [Indexed: 11/30/2022]
Abstract
Developing solid state materials capable of generating homogeneous white light in an energy efficient and resource-sustainable way is central to the design of new and improved devices for various lighting applications. Most currently-used phosphors depend on strategically important rare earth elements, and rely on a multicomponent approach, which produces sub-optimal quality white light. Here, we report the design and preparation of a colloidal white-light emitting nanocrystal conjugate. This conjugate is obtained by linking colloidal Ga2O3 and II–VI nanocrystals in the solution phase with a short bifunctional organic molecule (thioglycolic acid). The two types of nanocrystals are electronically coupled by Förster resonance energy transfer owing to the short separation between Ga2O3 (energy donor) and core/shell CdSe/CdS (energy acceptor) nanocrystals, and the spectral overlap between the photoluminescence of the donor and the absorption of the acceptor. Using steady state and time-resolved photoluminescence spectroscopies, we quantified the contribution of the energy transfer to the photoluminescence spectral power distribution and the corresponding chromaticity of this nanocrystal conjugate. Quantitative understanding of this new system allows for tuning of the emission color and the design of quasi-single white light emitting inorganic phosphors without the use of rare-earth elements.
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24
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Wawrzynczyk D, Nyk M, Samoc M. Synthesis and optical characterization of lanthanide-doped colloidal Ga2O3 nanoparticles. Chem Phys 2015. [DOI: 10.1016/j.chemphys.2015.01.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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25
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Saha M, Ghosh S, Ashok VD, De SK. Carrier concentration dependent optical and electrical properties of Ga doped ZnO hexagonal nanocrystals. Phys Chem Chem Phys 2015; 17:16067-79. [PMID: 26029747 DOI: 10.1039/c4cp05480f] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Colloidal trivalent gallium (Ga) doped zinc oxide (ZnO) hexagonal nanocrystals have been prepared to introduce more carrier concentration into the wide band gap of ZnO. The dopant (Ga) modifies the morphology and size of ZnO nanocrystals. Low content of Ga enhances the optical band gap of ZnO due to excess carrier concentration in the conduction band of ZnO. The interaction among free carriers arising from higher concentration of Ga gives rise to narrowing of the band gap. Surface plasmon resonance absorption appears in the infrared region due to excessive carrier concentration. A broad emission band consists of blue, yellow and green colors associated with different native defects of ZnO. Intrinsic defects and extrinsic dopant Ga control the defect related emission spectrum in the visible region. Replacement of Zn by Ga induces a room temperature metallic state in a degenerate semiconductor. Cationic disorder leads to metal-semiconductor transition at low temperature strongly dependent on the concentration of Ga. Pure semiconducting behavior up to about 80 K is observed for the highest amount of Ga. Temperature dependent metal-semiconductor transition has been interpreted by localization of charge carriers due to disorder arising from random Ga substitution.
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Affiliation(s)
- Manas Saha
- Department of Materials Science, Indian Association for the Cultivation of Science, Jadavpur, Kolkata - 700032, India.
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26
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Zhang X, Liu W, Wei GZ, Banerjee D, Hu Z, Li J. Systematic Approach in Designing Rare-Earth-Free Hybrid Semiconductor Phosphors for General Lighting Applications. J Am Chem Soc 2014; 136:14230-6. [DOI: 10.1021/ja507927a] [Citation(s) in RCA: 148] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Xiao Zhang
- Department of Chemistry and
Chemical Biology, Rutgers University, 610 Taylor Road, Piscataway, New Jersey 08854, United States
| | - Wei Liu
- Department of Chemistry and
Chemical Biology, Rutgers University, 610 Taylor Road, Piscataway, New Jersey 08854, United States
| | - George Z. Wei
- Department of Chemistry and
Chemical Biology, Rutgers University, 610 Taylor Road, Piscataway, New Jersey 08854, United States
| | - Debasis Banerjee
- Department of Chemistry and
Chemical Biology, Rutgers University, 610 Taylor Road, Piscataway, New Jersey 08854, United States
| | - Zhichao Hu
- Department of Chemistry and
Chemical Biology, Rutgers University, 610 Taylor Road, Piscataway, New Jersey 08854, United States
| | - Jing Li
- Department of Chemistry and
Chemical Biology, Rutgers University, 610 Taylor Road, Piscataway, New Jersey 08854, United States
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27
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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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28
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Li P, Fan H, Cai Y, Xu M, Long C, Li M, Lei S, Zou X. Phase transformation (cubic to rhombohedral): the effect on the NO2 sensing performance of Zn-doped flower-like In2O3 structures. RSC Adv 2014. [DOI: 10.1039/c3ra47467d] [Citation(s) in RCA: 64] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
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29
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Sigaev VN, Golubev NV, Ignat'eva ES, Paleari A, Lorenzi R. Light-emitting Ga-oxide nanocrystals in glass: a new paradigm for low-cost and robust UV-to-visible solar-blind converters and UV emitters. NANOSCALE 2014; 6:1763-1774. [PMID: 24352834 DOI: 10.1039/c3nr05210a] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Wide-bandgap nanocrystals are an inexhaustible source of tuneable functions potentially addressing most of the demand for new light emitting systems. However, the implementation of nanocrystal properties in real devices is not straightforward if a robust and stable optical component is required as a final result. The achievement of efficient light emission from dense dispersions of Ga-oxide nanocrystals in UV-grade glass can be a breakthrough in this regard. Such a result would permit the fabrication of low cost UV-to-visible converters for monitoring UV-emitting events on a large-scale - from invisible hydrogen flames to corona dispersions. From this perspective, γ-Ga₂O₃ nanocrystals are developed by phase separation in Ga-alkali-germanosilicate glasses, obtaining optical materials based on a UV transparent matrix. Band-to-band UV-excitation of light emission from donor-acceptor pair (DAP) recombination is investigated for the first time in embedded γ-Ga₂O₃. The analysis of the decay kinetics gives unprecedented evidence that nanosized confinement of DAP recombination can force a nanophase to the efficient response of exactly balanced DAPs. The results, including a proof of concept of UV-to-visible viewer, definitely demonstrate the feasibility of workable glass-based fully inorganic nanostructured materials with emission properties borrowed from Ga₂O₃ single-crystals and tailored by the nanocrystal size.
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Affiliation(s)
- Vladimir N Sigaev
- P.D. Sarkisov International Laboratory of Glass-based Functional Materials, Mendeleev University of Chemical Technology of Russia, Miusskaya Square 9, 125190 Moscow, Russia
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30
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Yin J, Cao H. Synthesis and Photocatalytic Activity of Single-Crystalline Hollow rh-In2O3 Nanocrystals. Inorg Chem 2012; 51:6529-36. [DOI: 10.1021/ic300005c] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jiefu Yin
- Department of Chemistry, Tsinghua University, Beijing
100084, P. R. China
| | - Huaqiang Cao
- Department of Chemistry, Tsinghua University, Beijing
100084, P. R. China
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31
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Farvid SS, Radovanovic PV. Phase Transformation of Colloidal In2O3 Nanocrystals Driven by the Interface Nucleation Mechanism: A Kinetic Study. J Am Chem Soc 2012; 134:7015-24. [DOI: 10.1021/ja211627r] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Shokouh S. Farvid
- Department of Chemistry
and Waterloo Institute for
Nanotechnology, University of Waterloo,
200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada
| | - Pavle V. Radovanovic
- Department of Chemistry
and Waterloo Institute for
Nanotechnology, University of Waterloo,
200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada
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32
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Martha S, Reddy KH, Biswal N, Parida K. Facile synthesis of InGaZn mixed oxide nanorods for enhanced hydrogen production under visible light. Dalton Trans 2012; 41:14107-16. [DOI: 10.1039/c2dt31949g] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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