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Lin YC, Lo I, Tsai CD, Wang YC, Huang HC, Li CA, Chou MMC, Chang TC. Optimization of Ternary In xGa 1-xN Quantum Wells on GaN Microdisks for Full-Color GaN Micro-LEDs. Nanomaterials (Basel) 2023; 13:1922. [PMID: 37446439 DOI: 10.3390/nano13131922] [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: 05/31/2023] [Revised: 06/20/2023] [Accepted: 06/21/2023] [Indexed: 07/15/2023]
Abstract
Red, green, and blue light InxGa1-xN multiple quantum wells have been grown on GaN/γ-LiAlO2 microdisk substrates by plasma-assisted molecular beam epitaxy. We established a mechanism to optimize the self-assembly growth with ball-stick model for InxGa1-xN multiple quantum well microdisks by bottom-up nanotechnology. We showed that three different red, green, and blue lighting micro-LEDs can be made of one single material (InxGa1-xN) solely by tuning the indium content. We also demonstrated that one can fabricate a beautiful InxGa1-xN-QW microdisk by choosing an appropriate buffer layer for optoelectronic applications.
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Affiliation(s)
- Yu-Chung Lin
- Department of Physics, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
| | - Ikai Lo
- Department of Physics, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
| | - Cheng-Da Tsai
- Department of Physics, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
| | - Ying-Chieh Wang
- Center for Nanoscience and Nanotechnology, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
| | - Hui-Chun Huang
- Department of Materials and Optoelectronic Science, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
| | - Chu-An Li
- Department of Materials and Optoelectronic Science, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
| | - Mitch M C Chou
- Department of Materials and Optoelectronic Science, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
| | - Ting-Chang Chang
- Department of Physics, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
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2
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Nadig V, Herweg K, Chou MMC, Lin JWC, Chin E, Li CA, Schulz V, Gundacker S. Timing advances of commercial divalent-ion co-doped LYSO:Ce and SiPMs in sub-100 ps time-of-flight positron emission tomography. Phys Med Biol 2023; 68. [PMID: 36808914 DOI: 10.1088/1361-6560/acbde4] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [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] [Received: 10/27/2022] [Accepted: 02/21/2023] [Indexed: 02/23/2023]
Abstract
Objective.Together with novel photodetector technologies and emerging electronic front-end designs, scintillator material research is one of the key aspects to obtain ultra-fast timing in time-of-flight positron emission tomography (TOF-PET). In the late 1990s, Cerium-doped lutetium-yttrium oxyorthosilicate (LYSO:Ce) has been established as the state-of-the-art PET scintillator due to its fast decay time, high light yield and high stopping power. It has been shown that co-doping with divalent ions, such as Ca2+and Mg2+, is beneficial for its scintillation characteristics and timing performance. Therefore, this work aims to identify a fast scintillation material to combine it with novel photosensor technologies to push the state of the art in TOF-PET.Approach.This study evaluates commercially available LYSO:Ce,Ca and LYSO:Ce,Mg samples manufactured by Taiwan Applied Crystal Co., LTD regarding their rise and decay times as well as their coincidence time resolution (CTR) with both ultra-fast high-frequency (HF) readout and commercially available readout electronics, i.e. the TOFPET2 ASIC.Main results.The co-doped samples exhibit state-of-the-art rise times of on average 60 ps and effective decay times of on average 35 ns. Using the latest technological improvements made on NUV-MT SiPMs by Fondazione Bruno Kessler and Broadcom Inc., a 3 × 3 × 19 mm3LYSO:Ce,Ca crystal achieves a CTR of 95 ps (FWHM) with ultra-fast HF readout and 157 ps (FWHM) with the system-applicable TOFPET2 ASIC. Evaluating the timing limits of the scintillation material, we even show a CTR of 56 ps (FWHM) for small 2 × 2 × 3 mm3pixels. A complete overview of the timing performance obtained with different coatings (Teflon, BaSO4) and different crystal sizes coupled to standard Broadcom AFBR-S4N33C013 SiPMs will be presented and discussed.Significance.This work thoroughly evaluates commercially available co-doped LYSO:Ce crystals and, in combination with novel NUV-MT SiPMs, shows a TOF performance that significantly exceeds the current state of the art.
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Affiliation(s)
- Vanessa Nadig
- Department of Physics of Molecular Imaging Systems (PMI), Institute for Experimental Molecular Imaging (ExMI), RWTH Aachen University, D-52074 Aachen, Germany
| | - Katrin Herweg
- Department of Physics of Molecular Imaging Systems (PMI), Institute for Experimental Molecular Imaging (ExMI), RWTH Aachen University, D-52074 Aachen, Germany
| | | | - Jack W C Lin
- Taiwan Applied Crystal Co., LTD, Kaohsiung 80424, Taiwan
| | - Edmund Chin
- Taiwan Applied Crystal Co., LTD, Kaohsiung 80424, Taiwan
| | - Chu-An Li
- Center of Crystal Research, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
- Department of Materials and Optoelectronic Science, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
| | - Volkmar Schulz
- Department of Physics of Molecular Imaging Systems (PMI), Institute for Experimental Molecular Imaging (ExMI), RWTH Aachen University, D-52074 Aachen, Germany
- Hyperion Hybrid Imaging Systems GmbH, D-52074 Aachen, Germany
- Physics Institute IIIB, RWTH Aachen University, D-52074 Aachen, Germany
- Fraunhofer Institute for Digital Medicine MEVIS, D-52074 Aachen, Germany
| | - Stefan Gundacker
- Department of Physics of Molecular Imaging Systems (PMI), Institute for Experimental Molecular Imaging (ExMI), RWTH Aachen University, D-52074 Aachen, Germany
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3
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Shih CH, Chang CC, Wang KK, Huang HC, Chang L, Chou MMC. Substrate-Induced Anisotropic Growth of CuAlO 2 Platelets in a Liquid-Solid Reaction. ACS Omega 2023; 8:4703-4710. [PMID: 36777590 PMCID: PMC9909797 DOI: 10.1021/acsomega.2c06672] [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: 10/16/2022] [Accepted: 01/20/2023] [Indexed: 06/18/2023]
Abstract
This study reports a simplified method to grow CuAlO2 crystals of submillimeter sizes with a highly anisotropic shape of a platelet. The solid-state reaction of forming CuAlO2 at ca. 1373 K in the first stage of the conventional flux method is no longer required. The CuAlO2 platelets nucleated directly onto the (0001)sapphire surface in a melt of Cu2O saturated with Al2O3 at 1473 K. The excess flux was mostly removed by the capped alumina plate on cooling with a limited amount of residue which can be leached afterward. The CuAlO2 platelets all have a 3R crystal structure with no line and planar defects observed by TEM. The CuAlO2 crystals emit a luminescence at 3.49 eV associated with resonant Raman effect resulted from a band-to-band transition in room-temperature PL measurement. The facile fabrication method for growing highly anisotropic CuAlO2 crystals paves the way for their practical application in photoelectrochemical devices.
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Affiliation(s)
- Cheng-Hung Shih
- Department
of Materials and Optoelectronic Science, National Sun Yat-sen University, Kaohsiung80424, Taiwan, ROC
- Center
for Crystal Researches, National Sun Yat-sen
University, Kaohsiung80424, Taiwan, ROC
| | - Cheng-Chia Chang
- Department
of Materials and Optoelectronic Science, National Sun Yat-sen University, Kaohsiung80424, Taiwan, ROC
| | - Kuang-Kuo Wang
- Department
of Materials and Optoelectronic Science, National Sun Yat-sen University, Kaohsiung80424, Taiwan, ROC
| | - Hui-Chun Huang
- Department
of Materials and Optoelectronic Science, National Sun Yat-sen University, Kaohsiung80424, Taiwan, ROC
| | - Liuwen Chang
- Department
of Materials and Optoelectronic Science, National Sun Yat-sen University, Kaohsiung80424, Taiwan, ROC
- Center
for Crystal Researches, National Sun Yat-sen
University, Kaohsiung80424, Taiwan, ROC
| | - Mitch M. C. Chou
- Department
of Materials and Optoelectronic Science, National Sun Yat-sen University, Kaohsiung80424, Taiwan, ROC
- Center
for Crystal Researches, National Sun Yat-sen
University, Kaohsiung80424, Taiwan, ROC
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Paras, Yadav K, Kumar P, Teja DR, Chakraborty S, Chakraborty M, Mohapatra SS, Sahoo A, Chou MMC, Liang CT, Hang DR. A Review on Low-Dimensional Nanomaterials: Nanofabrication, Characterization and Applications. Nanomaterials (Basel) 2022; 13:160. [PMID: 36616070 PMCID: PMC9824826 DOI: 10.3390/nano13010160] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2022] [Revised: 12/23/2022] [Accepted: 12/24/2022] [Indexed: 09/02/2023]
Abstract
The development of modern cutting-edge technology relies heavily on the huge success and advancement of nanotechnology, in which nanomaterials and nanostructures provide the indispensable material cornerstone. Owing to their nanoscale dimensions with possible quantum limit, nanomaterials and nanostructures possess a high surface-to-volume ratio, rich surface/interface effects, and distinct physical and chemical properties compared with their bulk counterparts, leading to the remarkably expanded horizons of their applications. Depending on their degree of spatial quantization, low-dimensional nanomaterials are generally categorized into nanoparticles (0D); nanorods, nanowires, and nanobelts (1D); and atomically thin layered materials (2D). This review article provides a comprehensive guide to low-dimensional nanomaterials and nanostructures. It begins with the classification of nanomaterials, followed by an inclusive account of nanofabrication and characterization. Both top-down and bottom-up fabrication approaches are discussed in detail. Next, various significant applications of low-dimensional nanomaterials are discussed, such as photonics, sensors, catalysis, energy storage, diverse coatings, and various bioapplications. This article would serve as a quick and facile guide for scientists and engineers working in the field of nanotechnology and nanomaterials.
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Affiliation(s)
- Paras
- Department of Chemical Engineering, Indian Institute of Technology, Kharagpur 721302, India
| | - Kushal Yadav
- Department of Materials and Optoelectronic Science, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
- Department of Chemical Engineering, Indian Institute of Technology (Indian School of Mines), Dhanbad 826004, India
| | - Prashant Kumar
- Department of Chemical Engineering, Indian Institute of Technology, Kharagpur 721302, India
| | - Dharmasanam Ravi Teja
- Department of Civil Engineering, Indian Institute of Technology, Kharagpur 721302, India
| | - Sudipto Chakraborty
- Department of Chemical Engineering, Indian Institute of Technology, Kharagpur 721302, India
| | - Monojit Chakraborty
- Department of Chemical Engineering, Indian Institute of Technology, Kharagpur 721302, India
| | | | - Abanti Sahoo
- Department of Chemical Engineering, National Institute of Technology, Rourkela 769008, India
| | - Mitch M. C. Chou
- Department of Materials and Optoelectronic Science, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
- Center of Crystal Research, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
| | - Chi-Te Liang
- Department of Physics, National Taiwan University, Taipei 10617, Taiwan
- Center for Quantum Science and Engineering, National Taiwan University, Taipei 10617, Taiwan
- Taiwan Consortium of Emergent Crystalline Materials, National Taiwan University, Taipei 10617, Taiwan
| | - Da-Ren Hang
- Department of Materials and Optoelectronic Science, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
- Center of Crystal Research, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
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Huang SM, Wang PC, Chen PC, Hong JL, Cheng CM, Jian HL, Yan YJ, Yu SH, Chou MMC. The Singularity Paramagnetic Peak of Bi 0.3Sb 1.7Te 3 with p-type Surface State. Nanoscale Res Lett 2022; 17:12. [PMID: 35032238 PMCID: PMC8761187 DOI: 10.1186/s11671-021-03650-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Accepted: 12/30/2021] [Indexed: 06/14/2023]
Abstract
The magnetization measurement was performed in the Bi0.3Sb1.7Te3 single crystal. The magnetic susceptibility revealed a paramagnetic peak independent of the experimental temperature variation. It is speculated to be originated from the free-aligned spin texture at the Dirac point. The ARPES reveals that the Fermi level lies below the Dirac point. The Fermi wavevector extracted from the de Haas-van Alphen oscillation is consistent with the energy dispersion in the ARPES. Our experimental results support that the observed paramagnetic peak in the susceptibility curve does not originate from the free-aligned spin texture at the Dirac point.
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Affiliation(s)
- Shiu-Ming Huang
- Department of Physics, National Sun Yat-Sen University, Kaohsiung, 80424 Taiwan
- Taiwan Consortium of Emergent Crystalline Materials, TCECM, National Sun Yat-Sen University, Kaohsiung, 80424 Taiwan
- Center of Crystal Research, National Sun Yat-Sen University, Kaohsiung, 80424 Taiwan
| | - Pin-Cing Wang
- Department of Physics, National Sun Yat-Sen University, Kaohsiung, 80424 Taiwan
| | - Pin-Cyuan Chen
- Department of Physics, National Sun Yat-Sen University, Kaohsiung, 80424 Taiwan
| | - Jai-Long Hong
- Department of Physics, National Sun Yat-Sen University, Kaohsiung, 80424 Taiwan
| | - Cheng-Maw Cheng
- National Synchrotron Radiation Research Center, Hsin-Chiu, 80076 Taiwan
| | - Hao-Lun Jian
- Department of Materials and Optoelectronic Science, National Sun Yat-Sen University, Kaohsiung, 80424 Taiwan
| | - You-Jhih Yan
- Department of Materials and Optoelectronic Science, National Sun Yat-Sen University, Kaohsiung, 80424 Taiwan
| | - Shih-Hsun Yu
- Department of Materials and Optoelectronic Science, National Sun Yat-Sen University, Kaohsiung, 80424 Taiwan
| | - Mitch M. C. Chou
- Department of Materials and Optoelectronic Science, National Sun Yat-Sen University, Kaohsiung, 80424 Taiwan
- Taiwan Consortium of Emergent Crystalline Materials, TCECM, National Sun Yat-Sen University, Kaohsiung, 80424 Taiwan
- Center of Crystal Research, National Sun Yat-Sen University, Kaohsiung, 80424 Taiwan
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Huang SM, Wang PC, Jian HL, Chou MMC. The Magnetic Susceptibility Bifurcation in the Ni-Doped Sb 2Te 3 Topological Insulator with Antiferromagnetic Order Accompanied by Weak Ferromagnetic Alignment. Nanoscale Res Lett 2021; 16:180. [PMID: 34928440 PMCID: PMC8688649 DOI: 10.1186/s11671-021-03637-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Accepted: 12/07/2021] [Indexed: 06/14/2023]
Abstract
The magnetic susceptibility reveals a discontinuity at Néel temperature and a hysteresis loop with low coercive field was observed below Néel temperature. The magnetic susceptibility of zero field cool and field cool processes coincide at a temperature above the discontinuity, and they split at temperature blow the discontinuity. The magnetic susceptibility splitting is larger at lower external magnetic fields. No more magnetic susceptibility splitting was observed at a magnetic field above 7000 Oe which is consistent with the magnetic anisotropy energy. Our study supports that these magnetic susceptibility characteristics originate from an antiferromagnetic order accompanied by weak ferromagnetism.
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Affiliation(s)
- Shiu-Ming Huang
- Department of Physics, National Sun Yat-Sen University, 80424 Kaohsiung, Taiwan
- Center of Crystal Research, National Sun Yat-Sen University, 80424 Kaohsiung, Taiwan
| | - Pin-Cing Wang
- Department of Physics, National Sun Yat-Sen University, 80424 Kaohsiung, Taiwan
| | - Hao-Lun Jian
- Department of Materials and Optoelectronic Science, National Sun Yat-Sen University, 80424 Kaohsiung, Taiwan
| | - Mitch M. C. Chou
- Center of Crystal Research, National Sun Yat-Sen University, 80424 Kaohsiung, Taiwan
- Department of Materials and Optoelectronic Science, National Sun Yat-Sen University, 80424 Kaohsiung, Taiwan
- Taiwan Consortium of Emergent Crystalline Materials, TCECM, National Sun Yat-Sen University, 80424 Kaohsiung, Taiwan
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Islam SE, Hang DR, Chen CH, Chou MMC, Liang CT, Sharma KH. Rational design of hetero-dimensional C-ZnO/MoS 2 nanocomposite anchored on 3D mesoporous carbon framework towards synergistically enhanced stability and efficient visible-light-driven photocatalytic activity. Chemosphere 2021; 266:129148. [PMID: 33310520 DOI: 10.1016/j.chemosphere.2020.129148] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2020] [Revised: 11/03/2020] [Accepted: 11/27/2020] [Indexed: 06/12/2023]
Abstract
For efficient solar energy harvesting, various engineering strategies to strengthen visible-light responsivity of ZnO photocatalyst is under intensive investigation. In this work, a new ternary C-ZnO/MoS2/mesoporous carbon nanocomposite was successfully prepared by a two-step solution-processed synthesis protocol. The ternary composite exhibits a well-interconnected 3D mesoporous microstructure assembled by carbon nanosheets, which is loaded with quasi 0D ZnO nanoparticles and 2D MoS2 nanosheets. The carbonaceous nanocomposites show enhanced visible-light-driven photocatalytic performance and high photo-corrosion resistance. The incorporation of carbon in the hybrid design has manifold benefits that drastically promotes the photoactivity and photostability. The significant enhancement in photodegradation activity of the hybrid catalysts can be ascribed to a few positive synergistic effects, such as increased surface area and active reaction sites, boosted surface charge utilization efficiency, and band-gap lowering. The high porosity of the distinct microstructure raises the dye adsorption within the material. Tailored interface/surface properties enable more effective mass transport and higher separation efficiency of photo-generated carriers. The modulated electronic structure leads to the narrowing of the ZnO optical bandgap. Meanwhile, coupling with carbon prevents ZnO from photo-corrosion. Our approach highlights the roles of carbon as structure directing and stabilizing agents as well as heteroatom in defect engineering for wide band-gap oxide materials. The rational material design of multivariate mixed-dimensional architecture also provides guiding insight for the advancement of heterogeneous photocatalyst materials with superior performance and durability. The presented engineering strategy would be a promising method for the preparation of nanomaterials supported on 3D carbon network with high porosity and visible-light-driven photocatalytic performance.
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Affiliation(s)
- Sk Emdadul Islam
- Department of Materials and Optoelectronic Science, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan; Department of Physics, National Taiwan University, Taipei, 10617, Taiwan
| | - Da-Ren Hang
- Department of Materials and Optoelectronic Science, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan; Center of Crystal Research, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan.
| | - Chun-Hu Chen
- Department of Chemistry, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan
| | - Mitch M C Chou
- Department of Materials and Optoelectronic Science, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan; Center of Crystal Research, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan
| | - Chi-Te Liang
- Department of Physics, National Taiwan University, Taipei, 10617, Taiwan.
| | - Krishna Hari Sharma
- Department of Materials and Optoelectronic Science, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan
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Yan T, Min Y, Lin M, Chen C, Lee C, Zhao L, Ye N, Chou MMC, Liu H, Zhou W. Intersected nonpolar ZnO nanosail arrays aligned epitaxially on LiGaO
2
substrate towards enhanced photoelectrochemical responses. Nano Select 2021. [DOI: 10.1002/nano.202000273] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Affiliation(s)
- Tao Yan
- Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou 350002 China
| | - Yunxiao Min
- Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou 350002 China
| | - Mei‐Yi Lin
- Department of Materials and Optoelectronic Science National Sun Yat‐sen University Kaohsiung 80424 Taiwan
| | - Chenlong Chen
- Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou 350002 China
| | - Chun‐Yu Lee
- Department of Materials and Optoelectronic Science National Sun Yat‐sen University Kaohsiung 80424 Taiwan
| | - Lili Zhao
- Institute for Advanced Interdisciplinary Research (IAIR) University of Jinan Jinan 250022 China
| | - Ning Ye
- Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou 350002 China
| | - Mitch M. C. Chou
- Department of Materials and Optoelectronic Science National Sun Yat‐sen University Kaohsiung 80424 Taiwan
| | - Hong Liu
- Institute for Advanced Interdisciplinary Research (IAIR) University of Jinan Jinan 250022 China
| | - Weijia Zhou
- Institute for Advanced Interdisciplinary Research (IAIR) University of Jinan Jinan 250022 China
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Hang DR, Pan YQ, Sharma KH, Chou MMC, Islam SE, Wu HF, Liang CT. 2D CTAB-MoSe 2 Nanosheets and 0D MoSe 2 Quantum Dots: Facile Top-Down Preparations and Their Peroxidase-Like Catalytic Activity for Colorimetric Detection of Hydrogen Peroxide. Nanomaterials (Basel) 2020; 10:E2045. [PMID: 33081190 PMCID: PMC7602750 DOI: 10.3390/nano10102045] [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] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Revised: 10/11/2020] [Accepted: 10/13/2020] [Indexed: 02/02/2023]
Abstract
We report the facile and economic preparation of two-dimensional (2D) and 0D MoSe2 nanostructures based on systematic and non-toxic top-down strategies. We demonstrate the intrinsic peroxidase-like activity of these MoSe2 nanostructures. The catalytic processes begin with facilitated decomposition of H2O2 by using MoSe2 nanostructures as peroxidase mimetics. In turn, a large amount of generated radicals oxidizes 3,3,5,5-tetramethylbenzidine (TMB) to produce a visible color reaction. The enzymatic kinetics of our MoSe2 nanostructures complies with typical Michaelis-Menten theory. Catalytic kinetics study reveals a ping-pong mechanism. Moreover, the primary radical responsible for the oxidation of TMB was identified to be Ȯ2- by active species-trapping experiments. Based on the peroxidase mimicking property, we developed a new colorimetric method for H2O2 detection by using 2D and 0D MoSe2 nanostructures. It is shown that the colorimetric sensing capability of our MoSe2 catalysts is comparable to other 2D materials-based colorimetric platforms. For instance, the linear range of H2O2 detection is between 10 and 250 μM by using 2D functionalized MoSe2 nanosheets as an artificial enzyme. Our work develops a systematic approach to use 2D materials to construct novel enzyme-free mimetic for a visual assay of H2O2, which has promising prospects in medical diagnosis and food security monitoring.
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Affiliation(s)
- Da-Ren Hang
- Department of Materials and Optoelectronic Science, National Sun Yat-sen University, Kaohsiung 80424, Taiwan; (Y.-Q.P.); (K.H.S.); (M.M.C.C.)
- Center of Crystal Research, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
| | - Ya-Qi Pan
- Department of Materials and Optoelectronic Science, National Sun Yat-sen University, Kaohsiung 80424, Taiwan; (Y.-Q.P.); (K.H.S.); (M.M.C.C.)
| | - Krishna Hari Sharma
- Department of Materials and Optoelectronic Science, National Sun Yat-sen University, Kaohsiung 80424, Taiwan; (Y.-Q.P.); (K.H.S.); (M.M.C.C.)
| | - Mitch M. C. Chou
- Department of Materials and Optoelectronic Science, National Sun Yat-sen University, Kaohsiung 80424, Taiwan; (Y.-Q.P.); (K.H.S.); (M.M.C.C.)
- Center of Crystal Research, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
| | - Sk Emdadul Islam
- Department of Physics, National Taiwan University, Taipei 10617, Taiwan;
| | - Hui-Fen Wu
- Department of Chemistry, National Sun Yat-sen University, Kaohsiung 80424, Taiwan;
| | - Chi-Te Liang
- Department of Physics, National Taiwan University, Taipei 10617, Taiwan;
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10
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Huang SM, Lin C, You SY, Chen PC, Hong JL, Wong JF, Yan YJ, Yu SH, Chou MMC. Observation of Landau Level-Dependent Aharonov-Bohm-Like Oscillations in a Topological Insulator. Nanoscale Res Lett 2020; 15:171. [PMID: 32844331 PMCID: PMC7447688 DOI: 10.1186/s11671-020-03389-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Accepted: 07/23/2020] [Indexed: 06/11/2023]
Abstract
We study the quantum oscillations in the BiSbTe3 topological insulator. In addition to the Shubnikov-de Haas (SdH) oscillation, the Aharonov-Bohm-like (ABL) oscillations are also observed. The ABL oscillation period is constant at each Landau level (LL) which is determined from the SdH oscillation. The shorter ABL oscillation periods are observed at lower LLs. The oscillation period is proportional to the square root of the LL at temperatures. The ratio of the ABL oscillation period to the effective mass is weak LL dependence. The LL-dependent ABL oscillation might originate from the LL-dependent effective mass.
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Affiliation(s)
- Shiu-Ming Huang
- Department of Physics, National Sun Yat-Sen University, Kaohsiung, 80424 Taiwan
- Taiwan Consortium of Emergent Crystalline Materials, TCECM, National Sun Yat-Sen University, Kaohsiung, 80424 Taiwan
| | - Chien Lin
- Department of Physics, National Sun Yat-Sen University, Kaohsiung, 80424 Taiwan
| | - Sheng-Yu You
- Department of Physics, National Sun Yat-Sen University, Kaohsiung, 80424 Taiwan
| | - Pin-Cyuan Chen
- Department of Physics, National Sun Yat-Sen University, Kaohsiung, 80424 Taiwan
| | - Jai-Long Hong
- Department of Physics, National Sun Yat-Sen University, Kaohsiung, 80424 Taiwan
| | - Jyun-Fong Wong
- Department of Physics, National Sun Yat-Sen University, Kaohsiung, 80424 Taiwan
| | - You-Jhih Yan
- Department of Materials and Optoelectronic Science, National Sun Yat-Sen University, Kaohsiung, 80424 Taiwan
| | - Shih-Hsun Yu
- Department of Materials and Optoelectronic Science, National Sun Yat-Sen University, Kaohsiung, 80424 Taiwan
| | - Mitch M. C. Chou
- Taiwan Consortium of Emergent Crystalline Materials, TCECM, National Sun Yat-Sen University, Kaohsiung, 80424 Taiwan
- Department of Materials and Optoelectronic Science, National Sun Yat-Sen University, Kaohsiung, 80424 Taiwan
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Yan T, Trinkler L, Korsaks V, Lu CYJ, Berzina B, Chang L, Chou MMC, Ploog KH. Anisotropic photoluminescence of nonpolar ZnO epilayers and ZnO/Zn 1-xMg xO multiple quantum wells grown on LiGaO 2 substrate. Opt Express 2020; 28:5629-5638. [PMID: 32121779 DOI: 10.1364/oe.385828] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Accepted: 02/03/2020] [Indexed: 06/10/2023]
Abstract
The temperature-dependent polarized photoluminescence spectra of nonpolar ZnO samples were investigated by 263 nm laser. The degree of polarization (DOP) of m-plane quantum wells changes from 76% at 10 K to 40% at 300 K, which is much higher than that of epilayer. The strong anisotropy was presumably attributed to the enhanced confinement effect of a one-dimension confinement structure formed by the intersection of quantum well and basal stacking fault. The polarization of laser beam also has an influence on the DOP. It is assumed that the luminescence polarization should be affected not only by the in-plane strains but also the microstructural defects, which do modify the electronic band structure.
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12
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Hang DR, Sun DY, Chen CH, Wu HF, Chou MMC, Islam SE, Sharma KH. Facile Bottom-up Preparation of WS 2-Based Water-Soluble Quantum Dots as Luminescent Probes for Hydrogen Peroxide and Glucose. Nanoscale Res Lett 2019; 14:271. [PMID: 31399837 PMCID: PMC6689045 DOI: 10.1186/s11671-019-3109-5] [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] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/23/2019] [Accepted: 07/29/2019] [Indexed: 06/10/2023]
Abstract
Photoluminescent zero-dimensional (0D) quantum dots (QDs) derived from transition metal dichalcogenides, particularly molybdenum disulfide, are presently in the spotlight for their advantageous characteristics for optoelectronics, imaging, and sensors. Nevertheless, up to now, little work has been done to synthesize and explore photoluminescent 0D WS2 QDs, especially by a bottom-up strategy without using usual toxic organic solvents. In this work, we report a facile bottom-up strategy to synthesize high-quality water-soluble tungsten disulfide (WS2) QDs through hydrothermal reaction by using sodium tungstate dihydrate and L-cysteine as W and S sources. Besides, hybrid carbon quantum dots/WS2 QDs were further prepared based on this method. Physicochemical and structural analysis of QD hybrid indicated that the graphitic carbon quantum dots with diameters about 5 nm were held onto WS2 QDs via electrostatic attraction forces. The resultant QDs show good water solubility and stable photoluminescence (PL). The excitation-dependent PL can be attributed to the polydispersity of the synthesized QDs. We found that the PL was stable under continuous irradiation of UV light but can be quenched in the presence of hydrogen peroxide (H2O2). The obtained WS2-based QDs were thus adopted as an electrodeless luminescent probe for H2O2 and for enzymatic sensing of glucose. The hybrid QDs were shown to have a more sensitive LOD in the case of glucose sensing. The Raman study implied that H2O2 causes the partial oxidation of QDs, which may lead to oxidation-induced quenching. Overall, the presented strategy provides a general guideline for facile and low-cost synthesis of other water-soluble layered material QDs and relevant hybrids in large quantity. These WS2-based high-quality water-soluble QDs should be promising for a wide range of applications in optoelectronics, environmental monitoring, medical imaging, and photocatalysis.
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Affiliation(s)
- Da-Ren Hang
- Department of Materials and Optoelectronic Science, National Sun Yat-sen University, Kaohsiung, 80424 Taiwan
- Center of Crystal Research, National Sun Yat-sen University, Kaohsiung, 80424 Taiwan
| | - De-You Sun
- Department of Materials and Optoelectronic Science, National Sun Yat-sen University, Kaohsiung, 80424 Taiwan
| | - Chun-Hu Chen
- Department of Chemistry, National Sun Yat-sen University, Kaohsiung, 80424 Taiwan
| | - Hui-Fen Wu
- Department of Chemistry, National Sun Yat-sen University, Kaohsiung, 80424 Taiwan
| | - Mitch M. C. Chou
- Department of Materials and Optoelectronic Science, National Sun Yat-sen University, Kaohsiung, 80424 Taiwan
- Center of Crystal Research, National Sun Yat-sen University, Kaohsiung, 80424 Taiwan
| | - Sk Emdadul Islam
- Department of Materials and Optoelectronic Science, National Sun Yat-sen University, Kaohsiung, 80424 Taiwan
| | - Krishna Hari Sharma
- Department of Materials and Optoelectronic Science, National Sun Yat-sen University, Kaohsiung, 80424 Taiwan
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13
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Lan TH, Pan CY, Liu PH, Chou MMC. Fracture Resistance of Monolithic Zirconia Crowns in Implant Prostheses in Patients with Bruxism. Materials (Basel) 2019; 12:ma12101623. [PMID: 31108872 PMCID: PMC6567035 DOI: 10.3390/ma12101623] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/27/2019] [Revised: 05/14/2019] [Accepted: 05/15/2019] [Indexed: 11/16/2022]
Abstract
The aim of this study is to determine the minimum required thickness of a monolithic zirconia crown in the mandibular posterior area for patients with bruxism. Forty-nine full zirconia crowns, with seven different occlusal thicknesses of 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, and 1.0 mm, were made by using a computer-aided design/computer-aided manufacturing system (CAD/CAM). Seven crowns in each group were subjected to cyclic loading at 800 N and 5 Hz in a servohydraulic testing machine until fracture or completion of 100,000 cycles. Seven finite element models comprising seven different occlusal thicknesses of 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, and 1.0 mm were simulated using three different loads of vertical 800 N, oblique 10 degrees 800 N, and vertical 800 N + x N torque (x = 10, 50, and 100). The results of cyclic loading tests showed that the fracture resistance of the crown was positively associated with thickness. Specimen breakage differed significantly according to the different thicknesses of the prostheses (p < 0.01). Lowest von Mises stress values were determined for prostheses with a minimal thickness of 1.0 mm in different loading directions and with different forces. Zirconia specimens of 1.0 mm thickness had the lowest stress values and high fracture resistance and under 800 N of loading.
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Affiliation(s)
- Ting-Hsun Lan
- Division of Prosthodontics, Department of Dentistry, Kaohsiung Medical University Hospital, Kaohsiung 80708, Taiwan.
- School of Dentistry, College of Dental Medicine, Kaohsiung Medical University, Kaohsiung 80708, Taiwan.
| | - Chin-Yun Pan
- Division of Orthodontics, Department of Dentistry, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung 80708, Taiwan.
| | - Pao-Hsin Liu
- Department of Biomedical Engineering, I-Shou University, Kaohsiung 82442, Taiwan.
| | - Mitch M C Chou
- Department of Materials & Optoelectronic Science, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan.
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14
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Huang SM, Lin LJ, Yan YJ, Yu SH, Chou MMC, Hsieh HF, Ho CJ, Chen RS. The Extremely Enhanced Photocurrent Response in Topological Insulator Nanosheets with High Conductance. Nanoscale Res Lett 2018; 13:371. [PMID: 30465297 PMCID: PMC6249153 DOI: 10.1186/s11671-018-2758-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/02/2018] [Accepted: 10/15/2018] [Indexed: 06/09/2023]
Abstract
The photocurrent was performed in topological insulator nanosheets with different conductances. The higher photocurrent is observed in the nanosheet with higher conductance. The responsivity is proportional to the nanosheet conductance over two orders. The responsivity is independent of the light power intensity in vacuum, but responsivity drastically decreases at low power intensity in air. The ratio of the responsivity in air to that in vacuum is negatively proportional to the the inverse of the light power intensity. These behaviors are understood as the statistical photocurrent in a system with blocked molecules. The time constant decreases as the thickness increases. A longer time constant is observed in lower atmosphere pressure.
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Affiliation(s)
- Shiu-Ming Huang
- Department of Physics, National Sun Yat-Sen University, Kaohsiung, 80424 Taiwan
| | - Lin-Jie Lin
- Department of Physics, National Sun Yat-Sen University, Kaohsiung, 80424 Taiwan
| | - You-Jhih Yan
- Department of Materials and Optoelectronic Science, National Sun Yat-Sen University, Kaohsiung, 80424 Taiwan
| | - Shih-Hsun Yu
- Department of Materials and Optoelectronic Science, National Sun Yat-Sen University, Kaohsiung, 80424 Taiwan
| | - Mitch M. C. Chou
- Department of Materials and Optoelectronic Science, National Sun Yat-Sen University, Kaohsiung, 80424 Taiwan
- Center of Crystal Research, National Sun Yat-sen University, Kaohsiung, 80424 Taiwan
| | - Ho-Feng Hsieh
- Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei, 10607 Taiwan
| | - Chin-Jung Ho
- Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei, 10607 Taiwan
| | - Ruei-San Chen
- Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei, 10607 Taiwan
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Abstract
The functionalities of porous materials could be significantly enhanced if the materials themselves were in single-crystal form, which, owing to structural coherence, would reduce electronic and optical scattering effects. However, growing macroporous single crystals remains a fundamental challenge, let alone manufacturing crystals large enough to be of practical use. Here we demonstrate a straightforward, inexpensive, versatile method for creating macroporous gallium nitride single crystals on a centimetre scale. The synthetic strategy is built upon a disruptive crystal growth mechanism that utilises direct nitridation of a parent LiGaO2 single crystal rendering an inward epitaxial growth process. Strikingly, the resulting single crystals exhibit electron mobility comparable to that for bulk crystals grown by the conventional sodium flux method. This approach not only affords control of both crystal and pore size through synthetic modification, but proves generic, thus opening up the possibility of designing macroporous crystals in a wealth of other materials. Porous single crystals are desirable for optoelectronic applications, but their fabrication remains challenging. Here the authors produce centimetre-sized macroporous GaN single crystals with electron mobility comparable to that of bulk crystals via in situ inward epitaxial growth on parent LiGaO2 crystals.
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Affiliation(s)
- Chenlong 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, China.
| | - Shujing Sun
- Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China
| | - Mitch M C Chou
- MOST Taiwan Consortium of Emergent Crystalline Materials (TECCM), Department of Materials and Optoelectronic Science, National SunYat-Sen University, Kaohsiung, Taiwan, 80424, China.
| | - Kui Xie
- Key Laboratory of Design & Assembly of Functional Nanostructure, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China.
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Lin YC, Lo I, Shih HC, Chou MMC, Schaadt DM. Growth and Characterization of M-Plane GaN Thin Films Grown on γ-LiAlO 2 (100) Substrates. Scanning 2017; 2017:2362084. [PMID: 29109806 PMCID: PMC5664351 DOI: 10.1155/2017/2362084] [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] [Figures] [Subscribe] [Scholar Register] [Received: 07/28/2017] [Accepted: 09/13/2017] [Indexed: 06/07/2023]
Abstract
M-plane GaN thin films were grown on LiAlO2 substrates under different N/Ga flux ratios by plasma-assisted molecular beam epitaxy. An anisotropic growth of M-plane GaN was demonstrated against the N/Ga flux ratio. As the N/Ga flux ratio decreased by increasing Ga flux, the GaN surface trended to a flat morphology with stripes along [11[Formula: see text]0]. According to high-resolution X-ray diffraction analysis, Li5GaO4 was observed on the interface between GaN and LiAlO2 substrate. The formation of Li5GaO4 would influence the surface morphology and crystal quality.
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Affiliation(s)
- Yu-Chiao Lin
- Department of Physics, Department of Materials and Optoelectronic Science, Center for Nanoscience and Nanotechnology, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
- Institute of Energy Research and Physical Technologies, Clausthal University of Technology and Energy Research Center of Lower Saxony, Clausthal-Zellerfeld, Germany
| | - Ikai Lo
- Department of Physics, Department of Materials and Optoelectronic Science, Center for Nanoscience and Nanotechnology, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
| | - Hui-Chun Shih
- Department of Physics, Department of Materials and Optoelectronic Science, Center for Nanoscience and Nanotechnology, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
| | - Mitch M. C. Chou
- Department of Physics, Department of Materials and Optoelectronic Science, Center for Nanoscience and Nanotechnology, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
| | - D. M. Schaadt
- Institute of Energy Research and Physical Technologies, Clausthal University of Technology and Energy Research Center of Lower Saxony, Clausthal-Zellerfeld, Germany
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17
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Xu JL, Sun YJ, He JL, Wang Y, Zhu ZJ, You ZY, Li JF, Chou MMC, Lee CK, Tu CY. Ultrasensitive nonlinear absorption response of large-size topological insulator and application in low-threshold bulk pulsed lasers. Sci Rep 2015; 5:14856. [PMID: 26442909 PMCID: PMC4595639 DOI: 10.1038/srep14856] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2015] [Accepted: 08/28/2015] [Indexed: 11/13/2022] Open
Abstract
Dirac-like topological insulators have attracted strong interest in optoelectronic application because of their unusual and startling properties. Here we report for the first time that the pure topological insulator Bi2Te3 exhibited a naturally ultrasensitive nonlinear absorption response to photoexcitation. The Bi2Te3 sheets with lateral size up to a few micrometers showed extremely low saturation absorption intensities of only 1.1 W/cm2 at 1.0 and 1.3 μm, respectively. Benefiting from this sensitive response, a Q-switching pulsed laser was achieved in a 1.0 μm Nd:YVO4 laser where the threshold absorbed pump power was only 31 mW. This is the lowest threshold in Q-switched solid-state bulk lasers to the best of our knowledge. A pulse duration of 97 ns was observed with an average power of 26.1 mW. A Q-switched laser at 1.3 μm was also realized with a pulse duration as short as 93 ns. Moreover, the mode locking operation was demonstrated. These results strongly exhibit that Bi2Te3 is a promising optical device for constructing broadband, miniature and integrated high-energy pulsed laser systems with low power consumption. Our work clearly points out a significantly potential avenue for the development of two-dimensional-material-based broadband ultrasensitive photodetector and other optoelectronic devices.
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Affiliation(s)
- Jin-Long Xu
- Key Laboratory of Optoelectronic Materials Chemistry and Physics of CAS, Fujian Institute of Research on the Structure of Matter, Chinese Academic of Sciences, Fuzhou, 350002 China
| | - Yi-Jian Sun
- Key Laboratory of Optoelectronic Materials Chemistry and Physics of CAS, Fujian Institute of Research on the Structure of Matter, Chinese Academic of Sciences, Fuzhou, 350002 China
| | - Jing-Liang He
- State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, China
| | - Yan Wang
- Key Laboratory of Optoelectronic Materials Chemistry and Physics of CAS, Fujian Institute of Research on the Structure of Matter, Chinese Academic of Sciences, Fuzhou, 350002 China
| | - Zhao-Jie Zhu
- Key Laboratory of Optoelectronic Materials Chemistry and Physics of CAS, Fujian Institute of Research on the Structure of Matter, Chinese Academic of Sciences, Fuzhou, 350002 China
| | - Zhen-Yu You
- Key Laboratory of Optoelectronic Materials Chemistry and Physics of CAS, Fujian Institute of Research on the Structure of Matter, Chinese Academic of Sciences, Fuzhou, 350002 China
| | - Jian-Fu Li
- Key Laboratory of Optoelectronic Materials Chemistry and Physics of CAS, Fujian Institute of Research on the Structure of Matter, Chinese Academic of Sciences, Fuzhou, 350002 China
| | - Mitch M C Chou
- Department of Materials and Optoelectronics Science, National Sun Yat-sen University, 70, Lienhei Road, Kaohsiung, Taiwan
| | - Chao-Kuei Lee
- Department of Photonics, National Sun Yat-sen University, 70, Lienhei Road, Kaohsiung, Taiwan
| | - Chao-Yang Tu
- Key Laboratory of Optoelectronic Materials Chemistry and Physics of CAS, Fujian Institute of Research on the Structure of Matter, Chinese Academic of Sciences, Fuzhou, 350002 China
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18
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Lan TH, Liu PH, Chou MMC, Lee HE. Fracture resistance of monolithic zirconia crowns with different occlusal thicknesses in implant prostheses. J Prosthet Dent 2015; 115:76-83. [PMID: 26412004 DOI: 10.1016/j.prosdent.2015.06.021] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2015] [Revised: 06/17/2015] [Accepted: 06/24/2015] [Indexed: 11/24/2022]
Abstract
STATEMENT OF PROBLEM The use of monolithic zirconia crowns in implant prostheses is increasing, especially when the interdental space is insufficient. However, fractures have been reported in clinical practice. PURPOSE The purpose of this study was to determine the minimal thickness of a complete zirconia crown used for an implant prosthesis in the posterior dental region. MATERIAL AND METHODS Fifty complete zirconia crowns were produced using a computer-aided design/computer-aided manufacturing technique. In each group, 5 crowns of varying thicknesses (0.4, 0.5, 0.6, 0.7, and 0.8 mm) were subjected to cycles of vertical and 10-degree oblique compressive loading at 5 Hz and 300 N in a servohydraulic testing machine. Five finite element models comprising 5 different occlusal thicknesses (0.4, 0.5, 0.6, 0.7, and 0.8 mm) were simulated at 2 loading angles (0 and 10 degrees) and 3 loading forces (300, 500, and 800 N). Data were statistically analyzed, and fracture patterns were observed with a scanning electron microscope. RESULTS Cyclic loading tests revealed that the fracture resistance of the specimens was positively associated with prosthesis thickness (P<.01). Low von Mises stress values were obtained for prostheses with a minimal thickness of 0.7 mm under varying loading directions and forces. CONCLUSIONS Zirconia prostheses with a minimal thickness of 0.7 mm had a high fracture resistance and the lowest stress values. Therefore, dentists and laboratory technicians should carefully choose the optimum thickness of zirconia prostheses.
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Affiliation(s)
- Ting-Hsun Lan
- Attending Dentist, Department of Dentistry, Kaohsiung Medical University Hospital, Kaohsiung Taiwan; Assistant Professor, School of Dentistry, College of Dental Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan.
| | - Pao-Hsin Liu
- Assistant Professor, Department of Biomedical Engineering, I-Shou University, Kaohsiung, Taiwan
| | - Mitch M C Chou
- Professor, Department of Materials & Opto-electronic Science, National Sun Yat-Sen University, Kaohsiung, Taiwan
| | - Huey-Er Lee
- Professor, School of Dentistry, College of Dental Medicine, Kaohsiung, Taiwan
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19
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Chen C, Yan T, Yu SH, Lee CY, Chang CW, Chou MMC. Microstructural and optical properties of high-quality ZnO epitaxially grown on a LiGaO2 substrate. RSC Adv 2015. [DOI: 10.1039/c5ra04499e] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [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] Open
Abstract
ZnO films with high crystallinity, high optical quality and very smooth surface have been epitaxially grown on (001) LiGaO2 substrate.
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Affiliation(s)
- Chenlong Chen
- MOST Taiwan Consortium of Emergent Crystalline Materials (TCECM)
- Department of Materials and Optoelectronic Science
- National Sun Yat-Sen University
- Kaohsiung
- Republic of China
| | - Tao Yan
- MOST Taiwan Consortium of Emergent Crystalline Materials (TCECM)
- Department of Materials and Optoelectronic Science
- National Sun Yat-Sen University
- Kaohsiung
- Republic of China
| | - Shih-Hsun Yu
- MOST Taiwan Consortium of Emergent Crystalline Materials (TCECM)
- Department of Materials and Optoelectronic Science
- National Sun Yat-Sen University
- Kaohsiung
- Republic of China
| | - Chun-Yu Lee
- MOST Taiwan Consortium of Emergent Crystalline Materials (TCECM)
- Department of Materials and Optoelectronic Science
- National Sun Yat-Sen University
- Kaohsiung
- Republic of China
| | - Chi-Wei Chang
- MOST Taiwan Consortium of Emergent Crystalline Materials (TCECM)
- Department of Materials and Optoelectronic Science
- National Sun Yat-Sen University
- Kaohsiung
- Republic of China
| | - Mitch M. C. Chou
- MOST Taiwan Consortium of Emergent Crystalline Materials (TCECM)
- Department of Materials and Optoelectronic Science
- National Sun Yat-Sen University
- Kaohsiung
- Republic of China
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20
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Abstract
Crystallographically aligned GaN nanobelt arrays were synthesized through a hybrid process of Au-assisted nucleation followed by non-Au-assisted anisotropy vapor-solid growth on a (100) γ-LiAlO2 substrate. To the best of our knowledge, this is the first report on aligned GaN nanobelts.
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Affiliation(s)
- Chenlong Chen
- NSC Taiwan Consortium of Emergent Crystalline Materials, Department of Materials and Optoelectronic Science, National Sun Yat-Sen University, Kaohsiung, 80424, Taiwan, Republic of China.
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Yan T, Leng Y, Yu Y, Sun D, Zhan J, Kamaruddin WHA, Qin X, Shi X, Chang L, Chou MMC, Wang J, Liu H. Growth of MgO doped near stoichiometric LiNbO3 single crystals by a hanging crucible Czochralski method using a ship lockage type powder feeding system assisted by numerical simulation. CrystEngComm 2014. [DOI: 10.1039/c4ce00524d] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [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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Jasinski J, Liliental-Weber Z, Maruska HP, Chai BH, Hill DW, Chou MMC, Gallagher JJ, Brown S. Structural Properties of Free-Standing 50 mm Diameter GaN Wafers with (1010) Orientation Grown on LiAlO2. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-764-c6.6] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Abstract(1010) GaN wafers grown on (100) face of γ-LiAlO2 were studied using transmission electron microscopy. Despite good lattice matching in this heteroepitaxial system, high densities of planar structural defects in the form of stacking faults on the basal plane and networks of boundaries located on prism planes inclined to the layer/substrate interface were present in these GaN layers. In addition, significant numbers of threading dislocations were observed. High-resolution electron microscopy indicates that stacking faults present on the basal plane in these layers are of low-energy intrinsic I1 type. This is consistent with diffraction contrast experiments.
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Chou MMC, Malocha DC. Acoustic velocities of shear waves in La3Ga(5.5)Ta(0.5)O14 piezoelectric crystal using singular value decomposition. IEEE Trans Ultrason Ferroelectr Freq Control 2010; 57:1813-1817. [PMID: 20679009 DOI: 10.1109/tuffc.2010.1619] [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: 05/29/2023]
Abstract
La3Ga(5.5)Ta(0.5)O14 (LGT) is a new piezoelectric material with superior electromechanical properties and high Q.f product. Transverse-wave splitting behavior of LGT was observed in the acoustic velocity measurements. The velocities of the two shear waves propagating in Y-(010) direction are very close and they cannot be separated completely. This has a tremendous influence on determining the correct velocity of the shear modes. It is proposed that the singular value decomposition (SVD) technique can be used to determine the splitting time of two shear modes in Y-plane LGT crystal. Moreover, it also helps to correct the arrival time of the transverse waves. It is believed that the presented approach is efficient and accurate for determining the correct velocities of shear modes in anisotropic media.
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Affiliation(s)
- Mitch M C Chou
- Department of Materials & Optoelectronic Science, National Sun Yat-Sen University, Kaohsiung, Taiwan, R.O.C.
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