CRYSTENGCOMM
·
2019
·Vol. 22
·期 1
·68-73
·
IF 3.382
Junli Wang,Fan Guan
Antimony selenide (Sb2Se3) is a low-toxic, element-abundant, narrow bandgap (Eg = ∼1.1–1.3 eV) semiconductor that shows potential for UV-Visible-Near-infrared optoelectronic applications. This paper reports the use of potassium selenocyanate (KSeCN) as a novel molecular selenium source to synthesize Sb2Se3 uniform nanorods. The resulting nanorods have been carefully characterized and are found to exhibit decent photoconductivity as well as broad-spectrum optical absorption with an Eg value of ∼1.35 eV. A molecular reaction mechanism is rationally proposed and evidenced for forming Sb2Se3, which is related to the thermal decomposition of selenocyanate (SeCN−) anions through the cleaving of Se–CN bonds to elemental Se(0), followed by its reduction to Se2− anions. Our work using KSeCN offers an alternative method for the synthesis of metal selenides with desirable nanostructures and properties.
研究领域:
材料科学
·
纳米技术
·
半导体物理
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2016
·
IF 2.933
Xiaokai Li,Xiaojian Mao,Minghui Feng,Junxi Xie,Benxue Jiang,Long Zhang
ZrO 2 is considered an efficient sintering additive for transparent Y 2 O 3 ceramics. However, the doping of tetravalent Zr 4+ ions leads to a dark brown color of the ceramic after vacuum sintering. In this study, the optical properties of vacuum-sintered and air-annealed ceramics were characterized using transmittance spectra and a Commission International de l’Eclairage (CIE) diagram. The corresponding defects are investigated by electron paramagnetic resonance (EPR) spectra. The band gap of the vacuum-sintered samples is 2.72 eV, which is much smaller than that of the annealed sample. The results reveal that the V O + (F + center) and Zr 3+ defects form transition energy levels near the top of the valence band and at the bottom of the conduction band , respectively. The color-related absorption is mainly attributed to the electronic transfer from the Zr 3+ level to the conduction band and from the F + center to the Zr 3+ level.
研究领域:
材料科学
·
无机非金属材料
·
光学材料
·
陶瓷材料
·
固体物理
✓ 已验证
DOI
高影响因子
Discover Nano
·
2024
·Vol. 19
·期 1
·1-8
·
IF 0
Xiong Yuanpeng,Wu Bo,Lin Yuanzhi,Zhang Mingwen,Chen Jintian
In this study, a simple route for the synthesis of hierarchical W 18 O 49 assembled by nanowires is reported. The morphologies and formation of W 18 O 49 single-crystal could be controlled by changing the concentration of WCl 6 -ethanol solution. This synthesis strategy has the advantages that the hierarchical W 18 O 49 microspheres could be economic synthesized at 180 °C without adding additives. Furthermore, efficient optical absorption properties in ultraviolet, visible and near-infrared region were obtained for the hierarchical W 18 O 49 microspheres comparing with nanowires. These results will further promote the research of tungsten-based oxide nanomaterials. Graphical abstract
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
SOLAR ENERGY
·
2020
·
IF 4.608
Xiao Nairui,Tang Yehua,Qiu Yali,Liu Duoduo,Wang Ke-Fan
Inorganic perovskite semiconductor Cs 2 SnI 6 is a promising solar light absorber material to replace its unstable organic-inorganic counterpart in perovskite solar cells. However, at present its synthesis method is still complex and expensive. Here we report a simple one-step solution method to synthesize the Cs 2 SnI 6 powder, and then the effects of reactant type, reactant ratio and reaction solvent on the purity, crystallinity, optical and electrical properties, air and thermal stability of the Cs 2 SnI 6 power were studied. We find that pure and crystalline Cs 2 SnI 6 powder can be achieved in acetonitrile or anhydrous ethanol with a CsI:SnI 2 ratio of 1:1, or with a CsI:SnI 4 ratio of 3:2 (or 2:1). Cs 2 SnI 6 film with better crystallinity usually has a stronger optical absorption, a lower carrier concentration, a higher carrier mobility, and a better air and thermal stablity. Optical absorption of Cs 2 SnI 6 synthesized in anhydrous ethanol and acetonitrile keeps almost unchanged at the anneal temperature up to 150 °C.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2016
·Vol. 18
·期 33
·6262-6271
·
IF 3.849
Yuxuan Liang,Pengpeng Bai,Jie Zhou,Tianqi Wang,Bingwei Luo,Shuqi Zheng
Non-toxic and earth-abundant pyrite (FeS2) is a promising photoelectric material for solar energy conversion and storage. In this study, an efficient FeS precursor was employed to synthesise successfully various shapes of pyrite FeS2, such as nanopolyhedra, nanocubes, nanooctahedra, and irregular nanocrystals via a simple hydrothermal method by adjusting the reaction conditions. Pyrite FeS2 nanopolyhedra and nanocubes were synthesised using the FeS precursor as the single iron source and thiourea (NH2CSNH2) as the sulphur source at various reaction temperatures. Nanooctahedra and irregular nanocrystals were obtained using sodium thiosulfate pentahydrate (Na2S2O3·5H2O) and sulphur powder as sulphur sources. The effects of polyvinylpyrrolidone content and the molar ratio of the FeS precursor to NH2CSNH2 on the formation of cubic shaped pyrite FeS2 were investigated. The products were characterised by X-ray diffraction, scanning electron microscopy, energy-dispersive spectroscopy, transmission electron spectroscopy, X-ray photoelectron spectroscopy, and ultraviolet–visible and Raman spectroscopy. The proposed facile hydrothermal method used an efficient FeS precursor as the iron source, which can be easily controlled to produce high-purity pyrite FeS2 with desirable optical absorption properties.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Jinzhu Wu,Yue Liu,Yuan Yao,Yanbin Shao,Xiaohong Wu
Superabsorbers can find application in the fields of solar cells, blackbody radiation, thermal control systems, and stray light elimination devices. Herein, graphene-like 2H/1T-molybdenum diselenide (MoSe 2 ) was synthesized via a hydrothermal method and shows superhigh solar absorption (~99%) within a range of 200–2500 nm. In the synthesis, selenium dioxide (SeO 2 ) was used as a Se source instead of Se powder, which plays an important role in manipulating the graphene-like morphology and the multiphasic composition of the MoSe 2 . Consequently, the as-prepared MoSe 2 nanoflowers possess desired band structure and abundant pores and pore channels for strong optical absorption. DFT calculations clarify that the 1T-MoSe 2 primarily contributes to the superior optical absorption over the 2H-MoSe 2 . This work provides a facile strategy for enhancing the optical absorption of two-dimensional transition metal dichalcogenides (2D TMDCs) by engineering morphology and phase.
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
PHYSICA B-CONDENSED MATTER
·
2017
·
IF 1.405
Xiaoping Qi,Lihong Bao,Luomeng Chao,O. Tegus
Nanocrystalline Ca-doped CeB 6 powders have been synthesized via a solid-state reaction of CaO and CeO 2 with NaBH 4 under a vacuum condition. The Ca doping effects on phase composition, grain morphology and optical absorption properties of nanocrystalline CeB 6 were investigated. As a result, all the synthesized nanocrystalline hexaborides are composed by single phase of CsCl -type structure. The grain size and morphology are very sensitive to the reaction temperature. The optical absorption result indicates that the absorption valley of nanocrystalline CeB 6 shows a red-shift from 619 nm to 685 nm with increasing Ca doping content, which means the tunable optical absorption of nanocrystalline Ca-doped CeB 6 . In addition, a first-principles calculation has been used to reveal the origin of the tunable optical properties. It is found that Ca doping reduces the total kinetic energy of the electrons of CeB 6 and leads to the absorption valleys shift to longer wavelength direction.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2015
·Vol. 7
·期 42
·17771-17777
·
IF 7.394
Hui Long,Lili Tao,Chun Yin Tang,Bo Zhou,Yuda Zhao,Longhui Zeng,Siu Fung Yu,Shu Ping Lau,Yang Chai,Yuen Hong Tsang
To control the optical properties of two-dimensional (2D) materials is a long-standing goal, being of both fundamental and technological significance. Tuning nonlinear optical absorption (NOA) properties of 2D transition metal dichalcogenides in a cost effective way has emerged as an important research topic because of its possibility to custom design NOA properties, implying enormous applications including optical computers, communications, bioimaging, and so on. In this study, WS2 with different size and thickness distributions was fabricated. The results demonstrate that both NOA onset threshold, FON, and optical limiting threshold, FOL, of WS2 under the excitation of a nanosecond pulsed laser can be tuned over a wide range by controlling its size and thickness. The FON and FOL show a rapid decline with the decrease of size and thickness. Due to the edge and quantum confinement effect, WS2 quantum dots (2.35 nm) exhibit the lowest FON (0.01 J cm−2) and FOL (0.062 J cm−2) among all the samples, which are comparable to the lowest threshold achieved in graphene based materials, showing great potential as NOA materials with tunable properties.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2022
·
IF 7.305
Yun Da,Jialei Zhou
The ability of calcium-based composites to simultaneously improve optical absorption and accelerate decomposition kinetics represents a major endeavor direction in the direct solar-driven thermochemical energy storage system. Doping strategy has been macroscopically proved to be an effective way in boosting optical absorption properties and calcination kinetics, but the underlying microscopic mechanisms are still unclear. This paper aims to reveal the mechanisms of optical absorption enhancement and accelerated decomposition kinetics for Mn-doped CaCO 3 through both experiments and density function theory (DFT). In the experiment, the optical absorption of Mn-doped CaCO 3 was much higher than that of pure CaCO 3 . The sample CaCO 3 –7Mn displayed satisfied optical absorption and fabulous cycling stability. The optical absorption reached 74% and energy storage density only decreased 2.6% after 20 cycles. Meanwhile, the decomposition reaction rate equations of pure CaCO 3 and Mn-doped CaCO 3 were obtained via non-isothermal kinetic analysis . The results indicated that doping Mn could accelerate decomposition kinetics of CaCO 3 by reducing the apparent activation energy . In the DFT calculation, the complex refractive index of Mn-doped CaCO 3 was lower in real part (refractive index) and higher in imaginary part (extinction coefficient) within the wavelength range from 300 to 2500 nm compared with pure CaCO 3 , which was closely related to the electron cloud distribution in the calcite crystal structure. Moreover, Mn-doped CaCO 3 has lower transition state energy barrier and dissociation energy than pure CaCO 3 . The calculation results revealed the mechanisms of doping Mn in CaCO 3 to enhance the light absorption and accelerate the decomposition kinetics from the microscopic perspective at atomic level. This work contributes to understanding the physical mechanisms of doping elements on boosting the performance of calcium-based composites at the molecular level.
研究领域:
材料科学
·
能源存储
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2024
·Vol. 12
·期 36
·2401453
·
IF 8
Lan Yang,Danil W. Boukhvalov,Hui Li,Wenbo Li,Sheng Dai,Mark G. Humphrey,Chi Zhang,Zhipeng Huang
Simultaneously optimizing nonlinear absorption coefficient and modulation depth is a considerable challenge for nonlinear optical materials. Here we present an effective solution through constructing PbS 2 -based inorganic-organic superlattice. PbS 2 /C n superlattice particles are synthesized, where n (4, 6, and 8) denotes the number of carbon atoms in the organic component. First-principles simulations indicate the formation of covalent bonds and van der Waals interaction between PbS 2 unit and interlayer organic molecules. All samples exhibit strong nonlinear absorption under femtosecond laser excitation with a wavelength range between 515 nm and 900 nm, and the nonlinear absorption coefficient increases with interlayer distance. The optimized sample, PbS 2 /C 8 , demonstrates outstanding nonlinear absorption and substantial modulation depth under 800 nm (the third-order nonlinear absorption coefficient β eff , 10449 ± 609 cm GW −1 ; modulation depth, 39.1%) and 900 nm (the fifth-order nonlinear absorption coefficient γ eff , 6465 ± 68 cm 3 GW −2 ; modulation depth, 88.1%), which exhibits saturable absorption under 515 nm ( β eff , -4932 ± 818 cm GW −1 ; modulation depth, 48.1%). It exhibits a small optical limiting threshold of 1.23 mJ cm −2 . These performances surpass those of typical single-/few-layer metal chalcogenides. Structural and spectral analyses elucidate that the remarkable optical nonlinearity can be attributed to quantum confinement in the inorganic layer and the dielectric enhancement of the superlattice.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Qian Feng,Jiarui Lu,Zhangmin Wan,Sicong Tan,Chuchu Chen,Weibing Wu,Junfeng Wang,Zhaoyang Xu
Solar-powered steam generation and desalination by interfacial solar steam generation (ISSG) are promising techniques for addressing the freshwater shortage. However, the insufficient conversion efficiency and complex pollutant components confine its further extension and application. This study innovatively constructs an orientational graphene/bamboo evaporator (GBE), maintaining a solvent-accessible surface area and reducing vaporization enthalpy by selective delignification and torrefaction. The GBE device features a channel oriented from bamboo, consolidating the parallel architecture with multilayer biofilm filtration that guides efficient bulk-water pumping, steam release, and pollutant interception. The GBE demonstrates full-spectrum optical absorption at 90.5 % and 33.4 s response time while maintaining operational stability across different salt concentrations and natural water environments. The GBE achieved an evaporation rate of 1.53 kg m -2 h -1 as 4.34 enhancement factor under 1 kW/m −2 (−|-) illumination, surpassing microplastics (99.84 %) and tetracycline (99.87 %) desalination. This work provides a high-performance and innovative approach to bamboo evaporator design, offering a viable and alternative method to address freshwater shortage.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2022
·
IF 8.129
Ying Yang,Yingjie Li,Chunxiao Zhang,Zirui He,Jianli Zhao
CaO/CaCO 3 thermochemical heat storage has been considered as a competitive technology in concentrated solar power plants. Carbide slag and red mud are solid wastes from the chlor-alkali industry and aluminum industry, respectively. In this work, the red mud/Mn co-doped high alumina cement-stabilized carbide slag was synthesized for CaO/CaCO 3 heat storage. The effects of the addition of high alumina cement and red mud/Mn on the heat storage capacity, cyclic stability, and optical absorption of the modified carbide slag were investigated. The modified carbide slag exhibits excellent heat storage capacity and optical absorption. The Ca 3 Al 2 O 6 and CaMnO 3 inhibit the growth of CaO grains. FeMnO 3 and Ca 2 Fe 2 O 5 possess high optical absorption properties . The additions of Mn and red mud enhance the heat storage rate and basicity of the carbide slag. The effective conversion of the modified carbide slag is 0.62 after 30 cycles, which is 3.1 times as high as that of the untreated carbide slag. The modified carbide slag reaches the optical absorptance of ~58%, which is 6.5 times as high as that of the untreated one. Thus, the red mud/Mn co-doped high alumina cement-stabilized carbide slag is a potential candidate for the CaO/CaCO 3 heat storage system .
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）