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Wang W, Zhao Y, Liu M, Zhang W, Zhang W, Tang M, Feng W, Sun X, Song Y, Yi M, Wang W. Novel solution synthesis of the overlooked cubic phase Cu 2GeTe 3 nanocrystals for optoelectronic devices. Dalton Trans 2022; 51:5792-5795. [PMID: 35356955 DOI: 10.1039/d1dt04307b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Herein, for the first time, we present a novel solution method for controllable synthesis of the overlooked cubic phase Cu2GeTe3 nanocrystals. The resulting Cu2GeTe3 nanocrystals are of high quality with monodispersed size and uniform shape. Optical characterization demonstrates that Cu2GeTe3 nanocrystals have a broad absorption in the visible to near-infrared region. Furthermore, an optoelectronic device based on Cu2GeTe3 nanocrystals exhibits excellent stability, reproducibility and responsivity. The novel synthetic route presented here not only can open a new avenue for fabricating Cu2GeTe3 nanocrystals, especially at the nanoscale, but also may further expand their applications.
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Affiliation(s)
- Wenliang Wang
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, Shandong, P. R. China. .,Key Laboratory of Life-Organic Analysis of Shandong Province, Qufu Normal University, Qufu 273165, Shandong, P. R. China
| | - Yutong Zhao
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, Shandong, P. R. China. .,Key Laboratory of Life-Organic Analysis of Shandong Province, Qufu Normal University, Qufu 273165, Shandong, P. R. China
| | - Mengxue Liu
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, Shandong, P. R. China.
| | - Wenqian Zhang
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, Shandong, P. R. China. .,Key Laboratory of Life-Organic Analysis of Shandong Province, Qufu Normal University, Qufu 273165, Shandong, P. R. China
| | - Wenxiu Zhang
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, Shandong, P. R. China.
| | - Mengqi Tang
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, Shandong, P. R. China.
| | - Wenling Feng
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, Shandong, P. R. China. .,Key Laboratory of Life-Organic Analysis of Shandong Province, Qufu Normal University, Qufu 273165, Shandong, P. R. China
| | - Xue Sun
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, Shandong, P. R. China.
| | - Yingqi Song
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, Shandong, P. R. China.
| | - Menglin Yi
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, Shandong, P. R. China.
| | - Weihua Wang
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, Shandong, P. R. China. .,Key Laboratory of Life-Organic Analysis of Shandong Province, Qufu Normal University, Qufu 273165, Shandong, P. R. China
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Dash TS, Naik S, Sheetal, Sarangi SN, Samal D, Yadav CS, Kaushik SD, Samal SL. Manifestation of dissimilar types of magnetism in iron- and chromium-substituted Mn 2SnS 4. Dalton Trans 2021; 50:15711-15720. [PMID: 34694308 DOI: 10.1039/d1dt02509k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Mn2SnS4 belongs to the MII2AIVQ4 (M = transition metal; A = Si, Ge and Sn; Q = S, Se and Te) class of compounds that crystallizes in the orthorhombic space group Cmmm and shows complex magnetic properties. Here we report the synthesis and magnetic properties of Fe- and Cr-substituted Mn2SnS4 quaternary chalcogenides. All these compounds have been synthesized using a high-temperature solid-state route. Room temperature neutron diffraction studies on the specific compositions of chromium- and iron-substituted compounds were performed to obtain the site occupancy of different elements in the unit cell. The neutron diffraction analysis by employing the Rietveld refinement shows that for the Fe-substituted compound, most of the Fe goes to the Mn site with a small amount at the Sn site, while in the Cr-substituted sample, all the Cr occupy the Mn site. However, the Sn site almost remains intact in the case of the Fe-substituted compound, while it is significantly disordered for the Cr-substituted sample as a fraction of Mn occupies the Sn site and an equivalent amount of Sn occupies the Mn site. XPS study shows that both Cr and Fe exist in the +3 oxidation state, while Mn exists in the +2 state and Sn exists in a mixture of +2 and +4 oxidation states. Magnetic property study of these substituted compounds shows different types of magnetism, which is attributed to the variation of d-electrons of the substituent atom. The chromium-doped compounds show ferrimagnetic character along with two transitions: one transition at ∼37 K and another at ∼152 K. However, in Fe-substituted Mn2SnS4 samples, the low-temperature transition disappears and an increase in the high-temperature antiferromagnetic ordering temperature i.e. from 152 K (Mn2SnS4) to 174 K (Mn1.82Fe0.18SnS4) is observed. The increase in the antiferromagnetic ordering temperature in Mn2-xFexSnS4 may be attributed to the increase in the covalence of Mn/Fe-S-Mn/Fe bonds (shorter) with iron substitution.
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Affiliation(s)
- Tuhin Subhra Dash
- Solid State and Materials Laboratory, Department of Chemistry, National Institute of Technology, Rourkela-769008, India.
| | - Subham Naik
- Solid State and Materials Laboratory, Department of Chemistry, National Institute of Technology, Rourkela-769008, India.
| | - Sheetal
- School of Basic Sciences, Indian Institute of Technology Mandi, Mandi-175005, H.P., India
| | | | - Debakanta Samal
- Institute of Physics, Bhubaneswar-751005, India.,Homi Bhabha National Institute, Anushakti Nagar, Mumbai 400085, India
| | - C S Yadav
- School of Basic Sciences, Indian Institute of Technology Mandi, Mandi-175005, H.P., India
| | - S D Kaushik
- UGC-DAE Consortium for Scientific Research, Mumbai Centre, BARC, Maharashtra-400085, India
| | - Saroj L Samal
- Solid State and Materials Laboratory, Department of Chemistry, National Institute of Technology, Rourkela-769008, India.
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Miller RC, Geiss RH, Prieto AL. Olivine Crystal Structure-Directed Twinning in Iron Germanium Sulfide (Fe 2GeS 4) Nanoparticles. ACS NANO 2021; 15:11981-11991. [PMID: 34157224 DOI: 10.1021/acsnano.1c03237] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Understanding the microstructure of complex crystal structures is critical for controlling material properties in next-generation devices. Synthetic reports of twinning in bulk and nanostructured crystals with detailed crystallographic characterization are integral for advancing systematic studies of twinning phenomena. Herein, we report a synthetic route to controllably twinned olivine nanoparticles. Microstructural characterization of Fe2GeS4 nanoparticles via electron microscopy (imaging, diffraction, and crystallographic analysis) demonstrates the formation of triplets of twins, or trillings. We establish synthetic control over the particle crystallinity and crystal growth. We describe the geometrical basis for twin formation, hexagonal pseudosymmetry of the orthorhombic lattice, and rank all of the reported olivine compounds according to this favorability to form twins. The work in this study highlights an area ripe for future exploration with respect to the advancement of solution-phase synthetic approaches that can control microstructure in compositionally complex, technologically relevant structures. Finally, we discuss the potential implications for olivine properties and performance in various applications.
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Affiliation(s)
- Rebecca C Miller
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Roy H Geiss
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Amy L Prieto
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
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4
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Zhou P, Pan L, Deng G, Zhou Z, Zhao H, Peng C, Yang S. Fe@Fe 3Ge 2 nanoparticles for MR imaging-guided NIR-driven photodynamic therapy in vivo. J Mater Chem B 2020; 7:5661-5668. [PMID: 31469371 DOI: 10.1039/c9tb01173k] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Photodynamic therapy (PDT) has attracted much attention as a useful technique for disease therapy, considering its minimum invasiveness, high spatial-temporal control, and specific lesion destruction. However, the limited generation of singlet oxygen (1O2) in PDT has restricted the practical biomedical applications of photosensitizers. To overcome this issue, we first developed iron nanoparticles as an Fe nanotemplate to synthesize iron germanium nanoalloy coated iron nanoparticles (Fe@Fe3Ge2 NPs), which possess strong near-infrared (NIR) absorption, as a highly stable photosensitizer and to generate 1O2 effectively under irradiation by an 808 nm laser for NIR-PDT via the mitochondrial apoptotic pathway. Taking advantage of the strong magnetic properties of the Fe nanotemplates and the effective generation of 1O2 by Fe3Ge2 nanoshells, Fe@Fe3Ge2 NPs could be applicable for efficient targeted magnetic resonance imaging-guided NIR-PDT in an αvβ3-positive U87MG glioblastoma model. This work marks an important step forward in developing a novel nanoparticulated theranostic agent for accurate clinical cancer theranostics in the future.
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Affiliation(s)
- Ping Zhou
- The Key Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, and Shanghai Municipal Education Committee Key Laboratory of Molecular Imaging Probes and Sensors, Shanghai Normal University, Shanghai 200234, China.
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Miller RC, Neilson JR, Prieto AL. Amide-Assisted Synthesis of Iron Germanium Sulfide (Fe 2GeS 4) Nanostars: The Effect of LiN(SiMe 3) 2 on Precursor Reactivity for Favoring Nanoparticle Nucleation or Growth. J Am Chem Soc 2020; 142:7023-7035. [PMID: 32212651 DOI: 10.1021/jacs.0c00260] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Olivine Fe2GeS4 has been identified as a promising photovoltaic absorber material introduced as an alternate candidate to iron pyrite, FeS2. The compounds share similar benefits in terms of elemental abundance and relative nontoxicity, but Fe2GeS4 was predicted to have higher stability with respect to decomposition to alternate phases and, therefore, more optimal device performance. Our initial report of the nanoparticle (NP) synthesis for Fe2GeS4 was not well understood and required an inefficient 24 h growth to dissolve an iron sulfide impurity. Here, we report an amide-assisted Fe2GeS4 NP synthesis that directly forms the phase-pure product in minutes. This significant advance was achieved by the replacement of the poorly understood hexamethyldisilazane (HMDS) additive and TMS2S by the conjugate base, lithium bis(trimethylsilyl)amide (LiN(SiMe3)2), and elemental S, respectively. We hypothesized that fragments of both TMS2S and HMDS had carried out the roles that Brønsted bases play in amide-assisted NP syntheses and were necessary for Ge incorporation. Convolution of this role with the supply of S in TMS2S caused the iron sulfide impurities. Separating these effects in the use of LiN(SiMe3)2 and elemental S resulted in synthetic control over the ternary phase. Herein we explore the Fe-Ge-S reaction landscape and the role of the base. Its concentration was found to increase the reactivities of the Fe, Ge, and S precursors, and we discuss possible metal-amide intermediates. This affords tunability in two areas: favorability of NP nucleation versus growth and phase formation. The phase-purity of Fe2GeS4 depends on the molar ratios of the cations, base, and amine as well as the Fe:Ge:S molar ratios. The resultant Fe2GeS4 NPs exhibit an interesting star anise-like morphology with stacks of nanoplates that intersect along a 6-fold rotation axis. The optical properties of the Fe2GeS4 NPs are consistent with previously published measurements showing a measured band gap of 1.48 eV.
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Affiliation(s)
- Rebecca C Miller
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
| | - James R Neilson
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Amy L Prieto
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
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Lee JM, Miller RC, Moloney LJ, Prieto AL. The development of strategies for nanoparticle synthesis: Considerations for deepening understanding of inherently complex systems. J SOLID STATE CHEM 2019. [DOI: 10.1016/j.jssc.2018.12.053] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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7
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Shi X, Tian A, You J, Yang H, Wang Y, Xue X. Degradation of organic dyes by a new heterogeneous Fenton reagent - Fe 2GeS 4 nanoparticle. JOURNAL OF HAZARDOUS MATERIALS 2018; 353:182-189. [PMID: 29674093 DOI: 10.1016/j.jhazmat.2018.04.018] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2018] [Revised: 04/07/2018] [Accepted: 04/09/2018] [Indexed: 06/08/2023]
Abstract
The heterogeneous Fenton system has become the hotspot in the decontamination field due to its effective degradation performance with a wide pH range. Based on the unstable chemical properties of pyrite, in this article, Fe2GeS4 nanoparticles with better thermodynamic stability were prepared by vacuum sintering and high energy ball milling and its potential as Fenton reagent was investigated for the first time. Three determinants of the heterogeneous Fenton system including the iron source, hydrogen peroxide, pH and the degradation mechanism were investigated. The catalyst dosage of 0.3 g/L, initial H2O2 concentration in the Fenton system of 50 m mol/L and pH of 7 were chosen as the best operational conditions. An almost complete degradation was achieved within 5 min for methylene blue and rhodamine b while 10 min for methyl orange. The total organic carbon removal efficiencies of Fe2GeS4 heterogeneous Fenton system for methylene blue, methyl orange and rhodamine b in 10 min were 56.3%, 66.2% and 74.2%, respectively. It's found that the degradation ability could be attributed to a heterogeneous catalysis occurring at the Fe2GeS4 surface together with a homogeneous catalysis in the aqueous phase by the dissolved iron ions.
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Affiliation(s)
- Xiaoguo Shi
- Liaoning Provincial Key Laboratory of Metallurgical Resources Circulation Science, Northeastern University, Shenyang 110819, China
| | - Ang Tian
- Liaoning Provincial Key Laboratory of Metallurgical Resources Circulation Science, Northeastern University, Shenyang 110819, China
| | - Junhua You
- School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China
| | - He Yang
- Liaoning Provincial Key Laboratory of Metallurgical Resources Circulation Science, Northeastern University, Shenyang 110819, China
| | - Yuzheng Wang
- School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China
| | - Xiangxin Xue
- Liaoning Provincial Key Laboratory of Metallurgical Resources Circulation Science, Northeastern University, Shenyang 110819, China.
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Quan B, Liang X, Ji G, Zhang Y, Xu G, Du Y. Cross-Linking-Derived Synthesis of Porous Co xNi y/C Nanocomposites for Excellent Electromagnetic Behaviors. ACS APPLIED MATERIALS & INTERFACES 2017; 9:38814-38823. [PMID: 29035033 DOI: 10.1021/acsami.7b13411] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The magnet/dielectric composites with tunable structure and composition have drawn much attention because of their particular merits in magnetoelectric properties compared with the sole dielectric or magnetic composites. In addition, porous materials at the nanoscale can satisfy the growing requirements in many industries. Therefore, constructing porous metal alloy/carbon nanocomposites is to be an admirable option. Unfortunately, traditional synthesis methods involve multistep routes and complicated insert-and-remove templates approaches. Here we report a facile process to synthesize CoxNiy/C composites via a spontaneous cross-linking reaction and subsequent calcination process, during which multiple processes, including reducing polyvalent metal ions, forming alloy, and encapsulating alloy nanoparticles into porous carbon matrix, are achieved almost simultaneously. By adjusting the feed ratio of Co2+ to Ni2+ ions, controllable composition of CoxNiy/C composites can be gained. It should be noted that the CoxNiy/C composites are demonstrated to be excellent microwave absorbers from every aspect of assessment criteria including reflection loss, effective bandwidth, thickness, and weight of absorber. Our study opens up a promising technique for the synthesis of alloy/carbon composites with porous nanostructures with target functionalities.
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Affiliation(s)
- Bin Quan
- College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics , Nanjing 211100, PR China
| | - Xiaohui Liang
- College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics , Nanjing 211100, PR China
| | - Guangbin Ji
- College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics , Nanjing 211100, PR China
| | - Yanan Zhang
- College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics , Nanjing 211100, PR China
| | - Guoyue Xu
- College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics , Nanjing 211100, PR China
| | - Youwei Du
- Laboratory of Solid State Microstructures, Nanjing University , Nanjing 210093, PR China
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9
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Gong M, Liu Q, Goul R, Ewing D, Casper M, Stramel A, Elliot A, Wu JZ. Printable Nanocomposite FeS 2-PbS Nanocrystals/Graphene Heterojunction Photodetectors for Broadband Photodetection. ACS APPLIED MATERIALS & INTERFACES 2017; 9:27801-27808. [PMID: 28758390 DOI: 10.1021/acsami.7b08226] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Colloidal nanocrystals are attractive materials for optoelectronics applications because they offer a compelling combination of low-cost solution processing, printability, and spectral tunability through the quantum dot size effect. Here we explore a novel nanocomposite photosensitizer consisting of colloidal nanocrystals of FeS2 and PbS with complementary optical and microstructural properties for broadband photodetection. Using a newly developed ligand exchange to achieve high-efficiency charge transfer across the nanocomposite FeS2-PbS sensitizer and graphene on the FeS2-PbS/graphene photoconductors, an extraordinary photoresponsivity in exceeding ∼106 A/W was obtained in an ultrabroad spectrum of ultraviolet (UV)-visible-near-infrared (NIR). This is in contrast to the nearly 3 orders of magnitude reduction of the photoresponsivity from ∼106 A/W at UV to 103 A/W at NIR on their counterpart of FeS2/graphene detectors. This illustrates the combined advantages of the nanocomposite sensitizers and the high charge mobility in FeS2-PbS/graphene van der Waals heterostructures for nanohybrid optoelectronics with high performance, low cost, and scalability for commercialization.
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Affiliation(s)
- Maogang Gong
- Department of Physics and Astronomy, University of Kansas , Lawrence, Kansas 66045, United States
| | - Qingfeng Liu
- Department of Physics and Astronomy, University of Kansas , Lawrence, Kansas 66045, United States
| | - Ryan Goul
- Department of Physics and Astronomy, University of Kansas , Lawrence, Kansas 66045, United States
| | - Dan Ewing
- Department of Energy's National Security Campus , Kansas City, Missouri 64147, United States
| | - Matthew Casper
- Department of Energy's National Security Campus , Kansas City, Missouri 64147, United States
| | - Alex Stramel
- Department of Energy's National Security Campus , Kansas City, Missouri 64147, United States
| | - Alan Elliot
- Department of Energy's National Security Campus , Kansas City, Missouri 64147, United States
| | - Judy Z Wu
- Department of Physics and Astronomy, University of Kansas , Lawrence, Kansas 66045, United States
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Yamada T, Zettsu N, Nozaki S, Teshima K. Growth of idiomorphic LiMnPO4crystals in molten NaCl–KCl and LiF–NaCl–KCl fluxes. CrystEngComm 2017. [DOI: 10.1039/c6ce02114j] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Xu X, Ge Y, Wang M, Zhang Z, Dong P, Baines R, Ye M, Shen J. Cobalt-Doped FeSe2-RGO as Highly Active and Stable Electrocatalysts for Hydrogen Evolution Reactions. ACS APPLIED MATERIALS & INTERFACES 2016; 8:18036-42. [PMID: 27355432 DOI: 10.1021/acsami.6b03849] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Herein, we describe the preparation and testing of Co-doped FeSe2 hybridized with graphene (Fe1-xCoxSe2/RGO), a high-active yet stable electrocatalyst for hydrogen evolution reactions (HERs) in acidic solutions. First, we systematically analyze the composition and morphology of Fe1-xCoxSe2/RGO and attribute its excellent electrochemical performance to its unique architecture-a base of highly conductive graphene with fully exposed active edges that enhances conductivity and facilitates ion/electron transfer. Our experimental measurements indicate elevated HER activity with a moderate overpotential of ∼166 mV at a hydrogen production current density of 10 mA cm(-2), a small Tafel slope of ∼36 mV dec(-1), and long cycling lifespan more than 20 h. The promising results, in addition to the fact that Fe1-xCoxSe2/RGO is a high-performance, precious-metal-free electrocatalyst, pave the way for exciting opportunities in renewable hydrogen production applications.
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Affiliation(s)
- Xiaowei Xu
- Institute of Special Materials and Technology, Fudan University , Shanghai 200433, China
| | - Yuancai Ge
- Institute of Special Materials and Technology, Fudan University , Shanghai 200433, China
| | - Man Wang
- Institute of Special Materials and Technology, Fudan University , Shanghai 200433, China
| | - Zhuqing Zhang
- Institute of Special Materials and Technology, Fudan University , Shanghai 200433, China
| | - Pei Dong
- Department of Materials Science and NanoEngineering, Rice University , 6100 Main Street, Houston, Texas 77005, United States
| | - Robert Baines
- Department of Materials Science and NanoEngineering, Rice University , 6100 Main Street, Houston, Texas 77005, United States
| | - Mingxin Ye
- Institute of Special Materials and Technology, Fudan University , Shanghai 200433, China
| | - Jianfeng Shen
- Institute of Special Materials and Technology, Fudan University , Shanghai 200433, China
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Berlinguette CP. Editorial for the ACS select virtual issue on inorganic chemistry driving the energy sciences. Inorg Chem 2016; 54:3079-83. [PMID: 25843332 DOI: 10.1021/acs.inorgchem.5b00490] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Gudelli VK, Kanchana V, Vaitheeswaran G. Predicted thermoelectric properties of olivine-type Fe2GeCh4 (Ch = S, Se and Te). JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2016; 28:025502. [PMID: 26683059 DOI: 10.1088/0953-8984/28/2/025502] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We present here the thermoelectric properties of olivine-type Fe2GeCh4 (Ch = S, Se and Te) using the linear augmented plane wave method based on first principles density functional calculations. The calculated transport properties using the semi-local Boltzmann transport equation reveal very high thermopower for both S and Se-based compounds compared to their Te counterparts. The main reason for this high thermopower is the quasi-flat nature of the bands at the valence and conduction band edges. The calculated thermopower of Fe2GeS4 is in good agreement with the experimental reports at room temperature, with the carrier concentration around 10(18)-10(19)cm(-3). All the investigated systems show an anisotropic nature in their electrical conductivity, resulting in a value less than the order of 10(2) along the a-axis compared to the b- and c-axes. Among the studied compounds, Fe2GeS4 and Fe2GeSe4 emerge as promising candidates with good thermoelectric performance.
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Affiliation(s)
- Vijay Kumar Gudelli
- Department of Physics, Indian Institute of Technology Hyderabad, Ordnance Factory Estate, Yeddumailaram-502 205, Telangana, India
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Kassem MA, Tabata Y, Waki T, Nakamura H. Structure and magnetic properties of flux grown single crystals of Co3−Fe Sn2S2 shandites. J SOLID STATE CHEM 2016. [DOI: 10.1016/j.jssc.2015.10.005] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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15
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Zhou B, Li M, Wu Y, Yang C, Zhang WH, Li C. Monodisperse AgSbS2Nanocrystals: Size-Control Strategy, Large-Scale Synthesis, and Photoelectrochemistry. Chemistry 2015; 21:11143-51. [DOI: 10.1002/chem.201501000] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2015] [Indexed: 11/08/2022]
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Huang S, He Q, Chen W, Qiao Q, Zai J, Qian X. Ultrathin FeSe2Nanosheets: Controlled Synthesis and Application as a Heterogeneous Catalyst in Dye-Sensitized Solar Cells. Chemistry 2015; 21:4085-91. [DOI: 10.1002/chem.201406124] [Citation(s) in RCA: 96] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2014] [Indexed: 11/06/2022]
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Polavarapu L, Mourdikoudis S, Pastoriza-Santos I, Pérez-Juste J. Nanocrystal engineering of noble metals and metal chalcogenides: controlling the morphology, composition and crystallinity. CrystEngComm 2015. [DOI: 10.1039/c5ce00112a] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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