CHEMISTRY-A EUROPEAN JOURNAL
·
2016
·Vol. 22
·期 34
·12160-12165
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IF 5.771
Fang Chen,Zhaohui Ren,Siyu Gong,Xiang Li,Ge Shen,Gaorong Han
Graphical Pick a side : Ag 2 O was selectively deposited on the positive polar surface of ferroelectric PbTiO 3 (PTO) nanoplates by a photochemical reaction. Formation of Ag 2 O is attributed to the oxidation of freshly formed silver nanoparticles by oxygen during visible-light irradiation. The composite shows efficient photocatalytic performance, which may be caused by the ferroelectric polarization effect of the PTO nanoplate. In this work, single-crystal and single-domain PbTiO 3 nanoplates are employed as substrates to prepare Ag 2 O/PbTiO 3 composite materials through a photodeposition method. It is revealed that silver oxide nanocrystals with an average size of 63 nm are selectively deposited on the positive polar surface of the ferroelectric substrate. The possible mechanism leading to the formation of silver oxide is that silver ions are first reduced to silver and then oxidized by oxygen generation. The composite shows an efficient photodegradation performance towards rhodamine B (RhB) and methyl orange (MO) under visible-light irradiation. Such highly efficient photoactivity can be attributed to the ferroelectric polarization effect of the substrate, which promotes the separation of photogenerated electrons and holes at the interface.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COORDINATION CHEMISTRY
·
2015
·
IF 2.012
Xi-He Huang,Zu-Ping Xiao,Feng-Lan Wang,Ting Li,Meng Wen,Shu-Ting Wu
Two silver(I) compounds, [Ag(H2mbpz)(Hchda)]n (1) and [Ag2(H2mbpz)2(oba)]n (2) (where H2mbpz = 3,3′,5,5′-tetramethyl-4,4′-bipyrazole, H2chda = trans-cyclohexane-dicarboxylic acid and H2oba = 4,4′-oxy-bis-benzoic acid), have been synthesized and characterized by single-crystal X-ray diffraction analyses. In both cases, the Ag(I) centers are linked by H2mbpz ligands to form 1-D Ag(I)-H2mbpz chains; then, the Ag(I)-H2mbpz chains connect with two neighboring congeners through Ag⋯Ag interactions, forming 2-D supramolecular layers. In 1, the dicarboxylate is monodeprotonated and linked to form an anion chain through strong hydrogen bonding interaction. Such anion chains attach on two sides of the supramolecular layers via Ag–O bonds to form a neutral sandwich-like layered network. In 2, the dicarboxylate is fully deprotonated and adopts a μ2-η1:η1 mode to link two adjacent supramolecular layers to form a twofold interpenetrating 3-D supramolecular network. The thermal stability and luminescence of 1 were also studied.
研究领域:
无机化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2018
·
IF 0
Yuan Wang,Cailv Zheng,Yilin Wang,Hanxiang Chen,Yun Xu
A new kind of ionic liquids has been synthesized which comprised double bonds in the structure of anions (DB-ILs). Their physical properties, including densities, viscosities, activation energies and diffusion coefficients were determined. Temperature-dependent Krichevsky-Kasarnovsky (K-K) was used to deal with the data of solubility of CO 2 in DB-ILs, thermo-properties including solve enthalpy (ΔH sol ), entropy (ΔS sol ) and Gibbs free energy (ΔG sol ) were obtained. The research shows that DB-ILs perform well at the capturing CO 2 and can be regenerated four times.
研究领域:
化学工程
·
热力学
✓ 已验证
产品关联
DOI
INORGANIC CHEMISTRY
·
2020
·
IF 4.825
Kuan-Guan Liu,Xue-Wen Wei,Fahime Bigdeli,Xue-Mei Gao,Jing-Zhe Li,Xiao-Wei Yan,Mao-Lin Hu,Ali Morsali
Advancement of the synthesis and control of the self-assembly process of new high-nucleus silver clusters with desired structures is important for both the material sciences and the many applications. Herein, three new silver clusters, 20-, 22-, and 8-nucleus, based on alkynyl ligands were constructed and their structures were confirmed by single-crystal X-ray diffraction, powder X-ray diffraction, elemental analyses, and Fourier-transform infrared spectroscopy (FT-IR). For the first time, the trivalent tetrahedron anion of AsO43–, as a template, and the surface ligand of Ph2PO2H, with new coordination modes, were employed in preparation of the silver clusters. The role of surface ligands and template anions in the size and structure of the clusters was investigated. The presence of the template in the structure of the clusters led to the formation of the high-nucleus clusters. Also, in this report, it was shown that the participation of the template in the assembly of a cluster can be controlled by the surface ligands. UV–vis absorption and luminescent properties of the clusters and the thermal stability of the 8-nucleus cluster were also studied.
研究领域:
材料科学
·
化学合成
·
配位化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Yongbo Fan,Weijia Wang,Jinyan Zhao
Dielectric capacitors with high recoverable energy density are in high demand for their application in electrical and electronic systems. Among lead-free dielectric materials, silver niobate (AgNbO 3 ) has attracted growing interest due to its superior energy storage density at room temperature. The field-induced phase transition from antiferroelectric (AFE) phase to ferroelectric (FE) phase contributes to its large energy density. In this work, pure perovskite silver niobate ceramics were fabricated in an oxygen atmosphere by the solid-state reaction technique. The Pbcm orthorhombic phase of AgNbO 3 was closely observed using the Rietveld refinement method to provide explanation for the origin of high spontaneous polarization within a unit cell. Local structural analysis via piezoelectric force microscopy revealed the existence of ferroelectric nano domains, which may contribute to the high energy storage efficiency (η = 99.9926%) in AgNbO 3 at low electric fields. The phase transitions of AgNbO 3 were also investigated via the dependence of the dielectric permittivity (ε′ and ε″) and loss angle tangent (tanδ) on temperatures, providing insights into the further modification of AgNbO 3 .
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Zhongyang Wang,Peitao Xie,Guohua Fan,Zidong Zhang,Yao Liu,Qilin Gu,Runhua Fan
Epsilon-negative behavior in metamaterials has attracted increasing attention recently. In this work, excessively percolating BaTiO 3 /Ag composites were synthesized by an in-situ preparation method to achieve negative permittivity. The epsilon-negative behavior is explained by low-frequency plasma oscillation of free electrons, which can be well fitted by the Drude model. Moreover, the negative permittivity of composites can be tuned by adjusting the content of randomly distributed Ag particles. The ac conductivity of excessively percolating BaTiO 3 /Ag composites shows a typical metal-like behavior. Furthermore, the investigation of reactance reveals that the inductive character derived from the conductive network is the main contributor to negative permittivity, as confirmed by the equivalent circuit analysis. This work provides a theoretical recipe for designing negative permittivity, supplements the family of metamaterials, and would further facilitate the practical applications of epsilon-negative materials in electromagnetic devices.
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Guangpeng Yang,Xuesen Du,Jingyu Ran,Xiangmin Wang,Yanrong Chen,Li Zhang,Vladislav Rac,Vesna Rakic,John Crittenden
SCR activity of Cu-SAPO-34 catalyst was reduced by alkali metal ions. The alkali metals ions (Li + , Na + and K + ) have shown irregular influences on Cu-SAPO-34. The order of poisoning strengths under 400 °C was found to be: Na + > K + > Li + , which is not consistent with the basicities of their corresponding metals. Experimental results and calculations showed that the alkali metal ions readily replace H + and Cu 2+ /Cu + ions. These exchanges result in the loss of Brønsted acid sites and migration of isolated Cu 2+ ions in Cu-SAPO-34, which decrease the NH 3 -SCR activity. Both the basicity and ion diameter will affect the exchanging behavior of an alkali ion. Na + and Li + ions will influence both H + and Cu 2+ /Cu + ions but K + ions only preferably replace the H + . We hypothesize that K + cannot enter into a small ring (6-membered ring) to replace a Cu 2+ /Cu + ion because of its large ion diameter. The displaced Cu 2+ /Cu + ions will transfer to adjacent unbonded Al site to form a CuAlO 2 species.
研究领域:
环境科学
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催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Xinan Shi,Lijian Huang,Daocheng Pan
In this research, a facile and environmentally friendly solution approach is developed to deposit Cu 2 ZnSn(S,Se) 4 thin films by addition of n -butylammonium butyrate ionic liquid . n -Butylammonium butyrate plays a critical role in solution deposition of Cu 2 ZnSnS 4 precursor thin film. We find that liquid n -butylammonium butyrate can dissolve a number of metal oxides , including Cu 2 O, ZnO, and SnO as well as various metal chlorides , metal nitrates and metal acetates. Smell-free Cu 2 ZnSnS 4 precursor solution is synthesized by dissolving Cu 2 O, ZnO, SnCl 2 and thiourea in an ethanol solution of n -butylammonium butyrate. Thermally degradable n -butylammonium butyrate can be completely removed by a low-temperature sintering process , forming high quality Cu 2 ZnSnS 4 nanoparticle thin film. A power conversion efficiency of 8.79% is obtained by this facile and green solution approach.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Chongguang Lyu,Chang Liu,Huihua Min,Xinyu Shi,Ran Jiang,Zhikang Ao,Xu Zhang,Chunli Wang,Huifang Ma,Lin Wang
Lead-free double perovskites have been an excellent candidate for resistive memories due to their mixed electronic-ionic properties, remarkable ambient stability and nontoxicity. However, the studies on resistive memories of rare-earth ion doping lead-free double perovskite are scarce to date. Here, we report the lead-free double perovskite Cs 2 AgBiBr 6 films with tuning rare earth Nd 3+ content by the vacuum sublimation and solution processing. The X-ray diffraction (XRD) pattern and scanning electron microscopy (SEM) confirm that Nd-doped Cs 2 AgBiBr 6 films show high crystallinity and phase purity. We also systematically investigate the resistive memory properties of the resulted Cs 2 AgBiBr 6 films doped by different content Nd 3+ . The resistive memory devices demonstrate a typical write-once-read-many-times (WORM) behavior with low on-set voltage and long retention time. Particularly, the ON/OFF ratio of Nd-doped Cs 2 AgBiBr 6 film is 1000 times higher than that of the undoped Cs 2 AgBiBr 6 film. This study exhibits that Nd-doped Cs 2 AgBiBr 6 film provide a new material platform for lead-free perovskite-based application in future electronics and optoelectronics .
研究领域:
材料科学
·
电子器件
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Chongguang Lyu,Yuchi Qian,Guixiang Zhan,Jiaxiao Yuan,Kaiyue He,Huihua Min,Chang Liu,Yang Cao,Xuefen Song,Huifang Ma,Yunfei Liu,Lin Wang
Rare earth ions have been widely investigated as active dopants in various materials because of their distinct optical, electronic and magnetic properties . Halide perovskite resistive memories have attracted increasingly recent interest for tremendous potential applications in computation and data storage techniques. However, it remains unexplored to implement rare earth doping strategy for tuning perovskite resistive memories. Here, we report read-only memories based on environment-friendly and air-stable lead-free double perovskite Cs 2 AgBiBr 6 films, which is particularly tuned by rare earth La 3+ doping. We use the vacuum sublimation and solution processing method to obtain Cs 2 AgBiBr 6 crystals doped by different content La 3+ , and fabricate resistive memory devices based on doped Cs 2 AgBiBr 6 films. The simplest sandwich-like structure composed of ITO/La-doped-Cs 2 AgBiBr 6 /Ag only is designed in cross-bar array architecture with high-integration and simple operation. The resistive memory device of La-doped Cs 2 AgBiBr 6 films demonstrate a typical write-once-read-many-times (WORM) behavior with low onset voltage of 1 V and long retention time of 12000 s. In particular, the ON/OFF ratio of the La-doped Cs 2 AgBiBr 6 film is 100 times higher than that of the undoped Cs 2 AgBiBr 6 film. This study provides a new insight to design and manipulate memory devices based on lead-free halide perovskite materials through doping effect of rare earth ions.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2022
·
IF 3.574
Jinhua Du,Ye Zhao,Yanyu Wang,Jing Ai,Yong Li,Xihong Hao
High energy density is an important factor for antiferroelectric materials applied in power pulse devices. Herein, the Ag (1-3x) Yb x NbO 3 (AYNO-100 x ) ceramics with x = 0, 0.02 and 0.04 were synthesized via a solid-state reaction method in an oxygen atmosphere. The Yb 3+ doping at A-site reduces the oxygen vacancy and increases the silver vacancy after reaching saturation, which improves the antiferroelectric stability, leading to enhanced recoverable energy-storage density of 2.7 J/cm 3 under 255 kV/cm at room temperature. Meanwhile, a relatively high discharge energy density of 1.0 J/cm 3 at 200 kV/cm is also observed in the Ag 0.94 Yb 0.02 NbO 3 ceramic. These results indicate that AgNbO 3 -based ceramics are potential candidates in advanced power electronic devices.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 31
·14158-14166
·
IF 3.591
Yuxiang Wang,Yue Liu,Xinan Shi,Lijian Huang,Junye Tong,Gang Wang,Daocheng Pan
Alkali-metal-ion doping is an efficient strategy to improve the device performance of thin film solar cells. Though doping with Li+ or Cs+ doping has been reported in Ag–Bi–I solar cells, the influence of doping with other alkali metal ions on Ag–Bi–I solar cells has not been systematically studied. In this work, we investigate the effects of five alkali metal ions (Li+, Na+, K+, Rb+, and Cs+) on the structure, morphology, and optical and electrical properties of Ag2BiI5 absorber layers, and also their influence on the device performance. All alkali-metal-doped Ag2BiI5 thin films show high crystallinity and have similar suitable band gaps. Hall effect measurements demonstrate that the alkali-metal-doped Ag2BiI5 films show an improved electrical performance compared with the pristine Ag2BiI5 thin film, which is beneficial to achieving high-efficiency solar cells. Unexpectedly, Cs+ doping can significantly increase the grain size of Ag2BiI5 thin films, leading to a porous absorber that reduces the device efficiency. The device performance of Li+-, Na+-, K+- and Rb+-doped Ag2BiI5 is significantly improved compared with that of pristine Ag2BiI5. It is found that the order of the power conversion efficiency promotion ability is K+ > Rb+ > Na+ > Li+ > Cs+ under the same experimental conditions. The present approach can be extended to other Bi-based solar cells to improve their device performance, which is critical for applications in absorbers with poor electrical performance or low crystallinity.
研究领域:
材料科学
·
光伏技术
✓ 已验证
产品关联
DOI
高影响因子
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