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Wang S, Guo T, Cao S. The Influence of Synthetic Parameters on HgSe QDs. ACS OMEGA 2023; 8:44804-44811. [PMID: 38046346 PMCID: PMC10688168 DOI: 10.1021/acsomega.3c05910] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/11/2023] [Revised: 10/25/2023] [Accepted: 10/27/2023] [Indexed: 12/05/2023]
Abstract
HgSe quantum dots (QDs) were synthesized by a thermal injection method. The effects of material ratio, growth time, and reaction temperature on the growth and spectral properties of the QDs have been studied. The experimental results show that the QDs had the highest yield of 53.04% when the molar ratio of Se source to Hg source was 1.5. Also, the excess source of SeS2 was reduced to Se. In addition, the critical radius and spectral red-shift rate of QDs can be increased with the reaction temperature. When the reaction temperature was increased to 100 °C, the spectrum reached far-infrared and the growth rate was increased to 10 times and reached 0.63 nm/min. Differing particle morphologies can be obtained by increasing the growth time to 40 min. Moreover, the growth rate reached the minimum at 30 min and the maximum at 80 min of the growth time. This study can provide guidance for the synthesis of long-wave infrared QD materials.
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Affiliation(s)
- Suhui Wang
- State Key Laboratory of
NBC Protection for Civilian, Beijing 102205, China
| | - Tengxiao Guo
- State Key Laboratory of
NBC Protection for Civilian, Beijing 102205, China
| | - Shuya Cao
- State Key Laboratory of
NBC Protection for Civilian, Beijing 102205, China
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Xiong C, Yang Z, Shen J, Tang F, He Q, Li Y, Xu M, Miao X. Nano t-Se Peninsulas Embedded in Natively Oxidized 2D TiSe 2 Enable Uniform and Fast Memristive Switching. ACS APPLIED MATERIALS & INTERFACES 2023; 15:23371-23379. [PMID: 37155833 DOI: 10.1021/acsami.3c00818] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Memristive devices, regardless of their potential applications in memory and computing scenarios, still suffer from large cycle-to-cycle and device-to-device variations due to the stochastic growth of conductive filaments (CFs). In this work, we fabricated a crossbar memristor using the 2D TiSe2 material and then oxidized it into TiO2 in the atmosphere at a moderate temperature. Such a mild oxidation approach fails to evaporate all Se into the air, and after further annealing using thermal or electrical stimulations, the remnant Se atoms gather near the interfaces and grow into nanosized crystals with relatively high conductivity. The resulting peninsula-shaped nanocrystals distort the electric field, forcing CFs to grow on them, which could largely confine the location and length of CFs. As a result, this two-terminal TiSe2/TiO2/TiSe2 device exhibits excellent resistive switching performance with a fairly low threshold voltage (Vset < 0.8 V, Vreset > 0.55 V) and high cycle-to-cycle consistency, enabling resistive switching at narrow operating variations, e.g., 500 ± 48 and 845 ± 39 mV. Our work offers a new approach to minimize the cycle-to-cycle stochasticity of the memristive device, paving the way for its applications in data storage and brain-inspired computing.
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Affiliation(s)
- Changying Xiong
- Wuhan National Laboratory for Optoelectronics, School of Integrated Circuits, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Zhe Yang
- Wuhan National Laboratory for Optoelectronics, School of Integrated Circuits, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Jiahao Shen
- Wuhan National Laboratory for Optoelectronics, School of Integrated Circuits, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Feiyu Tang
- Wuhan National Laboratory for Optoelectronics, School of Integrated Circuits, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Qiang He
- Wuhan National Laboratory for Optoelectronics, School of Integrated Circuits, Huazhong University of Science and Technology, Wuhan 430074, China
- Hubei Yangtze Memory Laboratories, Wuhan 430205, China
| | - Yi Li
- Wuhan National Laboratory for Optoelectronics, School of Integrated Circuits, Huazhong University of Science and Technology, Wuhan 430074, China
- Hubei Yangtze Memory Laboratories, Wuhan 430205, China
| | - Ming Xu
- Wuhan National Laboratory for Optoelectronics, School of Integrated Circuits, Huazhong University of Science and Technology, Wuhan 430074, China
- Hubei Yangtze Memory Laboratories, Wuhan 430205, China
| | - Xiangshui Miao
- Wuhan National Laboratory for Optoelectronics, School of Integrated Circuits, Huazhong University of Science and Technology, Wuhan 430074, China
- Hubei Yangtze Memory Laboratories, Wuhan 430205, China
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A simple way to prepare nickel selenide from NiSe2 to Ni1-xSe and their formation mechanism. J SOLID STATE CHEM 2018. [DOI: 10.1016/j.jssc.2018.07.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Xiang K, Liu H, Yang B, Zhang C, Yang S, Liu Z, Liu C, Xie X, Chai L, Min X. Selenium catalyzed Fe(III)-EDTA reduction by Na2SO3: a reaction-controlled phase transfer catalysis. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2016; 23:8113-8119. [PMID: 26888642 DOI: 10.1007/s11356-016-6267-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2015] [Accepted: 02/08/2016] [Indexed: 06/05/2023]
Abstract
Fe(II)-EDTA, a typical chelated iron, is able to coordinate with nitric oxide (NO) which accelerates the rates and kinetics of the absorption of flue gas. However, Fe(II)-EDTA can be easily oxidized to Fe(III)-EDTA which is unable to absorb NO. Therefore, the regeneration of fresh Fe(II)-EDTA, which actually is the reduction of Fe(III)-EDTA to Fe(II)-EDTA, becomes a crucial step in the denitrification process. To enhance the reduction rate of Fe(III)-EDTA, selenium was introduced into the SO3 (2-)/Fe(III)-EDTA system as catalyst for the first time. By comparison, the reduction rate was enhanced by four times after adding selenium even at room temperature (25 °C). Encouragingly, elemental Se could precipitate out when SO3 (2-) was consumed up by oxidation to achieve self-separation. A catalysis mechanism was proposed with the aid of ultraviolet-visible (UV-Vis) spectroscopy, Tyndall scattering, horizontal attenuated total reflection Fourier transform infrared (HATR-FTIR) spectroscopy, and X-ray diffraction (XRD). In the catalysis process, the interconversion between SeSO3 (2-) and nascent Se formed a catalysis circle for Fe(III)-EDTA reduction in SO3 (2-) circumstance.
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Affiliation(s)
- Kaisong Xiang
- School of Metallurgy and Environment, Central South University, Changsha, 410083, China
| | - Hui Liu
- School of Metallurgy and Environment, Central South University, Changsha, 410083, China.
- Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha, 410083, China.
| | - Bentao Yang
- School of Metallurgy and Environment, Central South University, Changsha, 410083, China
| | - Cong Zhang
- School of Metallurgy and Environment, Central South University, Changsha, 410083, China
| | - Shu Yang
- School of Metallurgy and Environment, Central South University, Changsha, 410083, China
| | - Zhilou Liu
- School of Metallurgy and Environment, Central South University, Changsha, 410083, China
| | - Cao Liu
- School of Metallurgy and Environment, Central South University, Changsha, 410083, China
| | - Xiaofeng Xie
- School of Metallurgy and Environment, Central South University, Changsha, 410083, China
| | - Liyuan Chai
- School of Metallurgy and Environment, Central South University, Changsha, 410083, China
- Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha, 410083, China
| | - Xiaobo Min
- School of Metallurgy and Environment, Central South University, Changsha, 410083, China.
- Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha, 410083, China.
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Li J, Su L, Zhu X, Li H, Cheng X, Li L. Decompression-induced disorder to order phase transition in low-melting ionic liquid [OMIM][PF6]. ACTA ACUST UNITED AC 2014. [DOI: 10.1007/s11434-014-0427-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Kumar A, Sevonkaev I, Goia DV. Synthesis of selenium particles with various morphologies. J Colloid Interface Sci 2014; 416:119-23. [DOI: 10.1016/j.jcis.2013.10.046] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2013] [Accepted: 10/21/2013] [Indexed: 11/24/2022]
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Dobias J, Suvorova EI, Bernier-Latmani R. Role of proteins in controlling selenium nanoparticle size. NANOTECHNOLOGY 2011; 22:195605. [PMID: 21430311 DOI: 10.1088/0957-4484/22/19/195605] [Citation(s) in RCA: 96] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
This work investigates the potential for harnessing the association of bacterial proteins to biogenic selenium nanoparticles (SeNPs) to control the size distribution and the morphology of the resultant SeNPs. We conducted a proteomic study and compared proteins associated with biogenic SeNPs produced by E. coli to chemically synthesized SeNPs as well as magnetite nanoparticles. We identified four proteins (AdhP, Idh, OmpC, AceA) that bound specifically to SeNPs and observed a narrower size distribution as well as more spherical morphology when the particles were synthesized chemically in the presence of proteins. A more detailed study of AdhP (alcohol dehydrogenase propanol-preferring) confirmed the strong affinity of this protein for the SeNP surface and revealed that this protein controlled the size distribution of the SeNPs and yielded a narrow size distribution with a three-fold decrease in the median size. These results support the assertion that protein may become an important tool in the industrial-scale synthesis of SeNPs of uniform size and properties.
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Affiliation(s)
- J Dobias
- Environmental Microbiology Laboratory, EPFL, Station 6, Lausanne, Switzerland
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Chakraborty S, Bardelli F, Charlet L. Reactivities of Fe(II) on calcite: selenium reduction. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2010; 44:1288-1294. [PMID: 20092306 DOI: 10.1021/es903037s] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The reductive immobilization of Se(IV) by micrometer-sized (100-200 microm) calcite containing sorbed or coprecipitated Fe(II) was investigated at pH 7 under anoxic conditions (O(2) < 1 ppmv) using X-ray absorption near-edge structure (XANES) spectroscopy. The Se(IV) sorption on calcite increased in the presence of sorbed Fe(II) compared to that of Fe-free pure calcite. XANES spectra of Se K-edge shows that nearly half of the total sorbed Se(IV) is reduced to Se(0) by Fe(II) sorbed on calcite within 24 h. The extent of reduction decreases with increasing equilibration time of calcite with Fe(II) solution before Se(IV) addition. The combined results of field emission scanning electron microscopy and X-ray diffraction have shown that needle-shaped red monoclinic elemental Se with diameters of 30-50 nm and lengths of up to 100 nm is precipitated on the calcite surface. Fe(II) coprecipitated calcite does not contribute to Se(IV) reduction within 72 h. Therefore, the reduction capacity of Fe(II) linked to calcite critically depends on its location (either on the surface or in the bulk solid), and less extensively on the pre-equilibration time of calcite with Fe(II) solution. Such understanding is important to predict the transport, transformation, and attenuation of Se in subsurface and in nuclear waste repositories.
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Affiliation(s)
- Sudipta Chakraborty
- LGIT-OSUG, University of Grenoble-I, BP 53, F-38041 Grenoble Cedex 9, France.
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Pearce CI, Pattrick RAD, Law N, Charnock JM, Coker VS, Fellowes JW, Oremland RS, Lloyd JR. Investigating different mechanisms for biogenic selenite transformations: Geobacter sulfurreducens, Shewanella oneidensis and Veillonella atypica. ENVIRONMENTAL TECHNOLOGY 2009; 30:1313-26. [PMID: 19950474 DOI: 10.1080/09593330902984751] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
The metal-reducing bacteria Geobacter sulfurreducens, Shewanella oneidensis and Veillonella atypica, use different mechanisms to transform toxic, bioavailable sodium selenite to less toxic, non-mobile elemental selenium and then to selenide in anaerobic environments, offering the potential for in situ and ex situ bioremediation of contaminated soils, sediments, industrial effluents, and agricultural drainage waters. The products of these reductive transformations depend on both the organism involved and the reduction conditions employed, in terms of electron donor and exogenous extracellular redox mediator. The intermediary phase involves the precipitation of elemental selenium nanospheres and the potential role of proteins in the formation of these structures is discussed. The bionanomineral phases produced during these transformations, including both elemental selenium nanospheres and metal selenide nanoparticles, have catalytic, semiconducting and light-emitting properties, which may have unique applications in the realm of nanophotonics. This research offers the potential to combine remediation of contaminants with the development of environmentally friendly manufacturing pathways for novel bionanominerals.
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Affiliation(s)
- Carolyn I Pearce
- School of Earth, Atmospheric and Environmental Sciences, University of Manchester, Manchester, UK.
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Mehta SK, Chaudhary S, Kumar S, Bhasin KK, Torigoe K, Sakai H, Abe M. Surfactant assisted synthesis and spectroscopic characterization of selenium nanoparticles in ambient conditions. NANOTECHNOLOGY 2008; 19:295601. [PMID: 21730604 DOI: 10.1088/0957-4484/19/29/295601] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
In this work, an attempt has been made to synthesize well-distributed stable selenium (Se) particles of nanosize dimensions via an aqueous micellar solution by the assistance of surfactants of two different polarities (anionic, sodium bis(2-ethylhexyl)sulfosuccinate (AOT) and cationic, hexadecyltrimethylammonium bromide (CTAB)). The morphology of the particles was examined with transmission electron microscopy (TEM). X-ray analysis reveals that the particles have a monoclinic structure. The band gap of the particles was determined from UV-visible optical spectroscopic results. The size variation was estimated by employing a quantum confinement effect equation. The evolution of the selenium nanoparticles in AOT and CTAB micellar media was corroborated with the time-dependent absorption spectra. The influence of hydrazine hydrate concentrations on the formation kinetics of Se nanoparticles was also investigated. The capping ability of the surfactants has been quantitatively evaluated from Fourier transform infrared (FTIR) studies.
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Affiliation(s)
- S K Mehta
- Department of Chemistry and Centre of Advanced Studies in Chemistry, Panjab University, Chandigarh 160014, India
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XAFS study of nanocrystalline selenium embedded in amorphous matrix. E-JOURNAL OF SURFACE SCIENCE AND NANOTECHNOLOGY 2006. [DOI: 10.1380/ejssnt.2006.213] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Johnson JA, Saboungi ML, Thiyagarajan P, Csencsits R, Meisel D. Selenium Nanoparticles: A Small-Angle Neutron Scattering Study. J Phys Chem B 1999. [DOI: 10.1021/jp983229y] [Citation(s) in RCA: 114] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Sun NX, Lu K. Heat-capacity comparison among the nanocrystalline, amorphous, and coarse-grained polycrystalline states in element selenium. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:6058-6061. [PMID: 9986606 DOI: 10.1103/physrevb.54.6058] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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