CHEMICAL PHYSICS
·
2019
·
IF 1.822
Tong-Tong Zhang,Xiang-Dong Gao,Yong-Qing Wu,Jing-Nan Yang,Xiao-Min Li
Cr-doped BaSnO 3 (BaSn 1-x Cr x O 3 , BSCO-x, x = 0–0.15) thin films with nanoporous structure were deposited on fluorine-doped tin oxide substrates via a colloidal solution route. The BSCO-x films exhibited single cubic perovskite phase and nanoporous feature, with the typical specific surface area of 18.98 m 2 /g and pore size of 10.75 nm (BSCO-0.15). The lowest band gap of 2.68 eV and a high transparency (above 70% in 500–800 nm) were realized in BSCO-0.15 film. This work paves a way toward perovskites with tunable band gap and nanoporous structures for varied photo and photoelectric devices.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2018
·
IF 4.7
Yibao Chen,Maxim S. Molokeev,Victor V. Atuchin,Ali H. Reshak,Sushil Auluck,Zeyad A. Alahmed,Zhiguo Xia
Exploring new perovskite-related solid-state materials and the investigating composition-dependent structural and physical properties are highly important for advanced functional material development. Herein, we present the successful hydrothermal synthesis of tetragonal CsPb2Cl5 and the anion-exchange phase formation of CsPb2(Cl1–xBrx)5 (x = 0–1) solid solutions. The CsPb2(Cl1–xBrx)5 crystal structures, which crystallize in the tetragonal system, space group I4/mcm, with parameters similar to those of CsPb2Cl5, have been determined by Rietveld analysis. The optical band gap was obtained by UV–vis spectroscopy, and the band structure was further calculated by the full-potential method within the generalized gradient approximation. It was revealed that the band gap in CsPb2(Cl1–xBrx)5 solid solutions can be tuned over the range of 4.5–3.8 eV by anion substitution.
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Jingjing Xu,Miaomiao Wu,Jingwen Yang,Zhengmei Wang,Mindong Chen,Fei Teng
In this work, we prepared a new wide band gap semiconductor, p -block metal oxyhydroxide InOOH, which exhibits efficient activity for perfluorooctanoic acid (PFOA) degradation under mild conditions and UV light irradiation. The apparent rate constant for PFOA degradation by InOOH is 27.6 times higher than that for P25 titania. Results show that ionized PFOA (C 7 F 15 COO − ) can be adsorbed much more efficiently on the surface of InOOH than P25. Then, the adsorbed C 7 F 15 COO − can be decomposed directly by photo-generated holes to form C 7 F 15 COO radicals. This process is the key step for the photocalytic degradation of PFOA. Major degradation intermediates, fluoride ions and perfluorinated carboxylic acids (PFCAs) with shorter chain lengths were detected during PFOA degradation. A possible pathway for photocatalytic degradation of PFOA is proposed based on the experimental results. Therefore, this studies indicates a potential new material and method for the efficient treatment of PFCA pollutants under mild conditions.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2020
·
IF 7.888
Ran Wang,Yawei Wang,Shufang Chang,Shu Jin,Yinlin Shao,Xiaoxiang Xu
Complete solid solutions between LaTaON 2 and SrZrO 3 , i.e. (LaTaON 2 ) 1−x (SrZrO 3 ) x (0 ≤ x ≤ 1) have been built which are very useful in tailoring many important parameters of LaTaON 2 . Band gap of LaTaON 2 becomes tunable by controlling the level of solid solutions with SrZrO 3 . Structural distortions, defects (e.g. Ta 4+ species) concentration and surface hydrophilicity of LaTaON 2 are largely improved by introducing SrZrO 3 in the structure. These modifications contribute to much enhanced photocatalytic activities of solid solutions for oxygen production which clearly outperform pristine LaTaON 2 under visible light illumination. Apparent quantum efficiency as high as 0.87% at 420 ± 20 nm was achieved at (LaTaON 2 ) 0.6 (SrZrO 3 ) 0.4 (x = 0.4). Further analysis suggest that introducing SrZrO 3 results in realignment of band edge positions of LaTaON 2 so as to be more appropriate for water splitting reactions.
研究领域:
材料科学
·
光催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Yanqing Zhu,Cong Shen,Xueqing Xu,Jianhua Zou,Lei Wang,Xudong Cheng,Jingqiu Liang,Xiudi Xiao,Gang Xu
InP quantum dots (QDs) with low toxicity are considered to be the most promising materials. However, the oxidation problem of In and P has become to the major factor affecting the optical properties of InP QDs. In this work, the effect of luminescence properties of InP/GaP/ZnS QDs with halogen acid treatment have been studied. The results show that HF and HCl are beneficial to improve the optical properties of QDs, HBr especially HI are not conductive to promote the photoluminescence quantum yield (PL QY) of QDs. HF and HCl can etch the oxidative layer effectively, the F − and Cl − can also passivate the surface indium dangling bonds in the form of atomic ligands. The proposed model of charge carrier recombination show that the PL QY improved significantly after HA treatment attributed to the recombination of electron-hole pairs through radiative pathways mainly from the conduction band and valence band . The InP QDs with HF treatment has the best luminescence properties with high PL QY of 96%, offering great potential for advanced optoelectronic devices.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Xuan Jiang,Zhaodong Nan
Multiple oxidation states of first-row transition-metal cations were always doped in g-C3N4 to enhance the catalytic activity by the synergistic action between the cations in the Fenton-like reaction. It remains a challenge for the synergistic mechanism when the stable electronic centrifugation (3d10) of Zn2+ was used. In this work, Zn2+ was facilely introduced in Fe-doped g-C3N4 (named xFe/yZn-CN). Compared with Fe-CN, the rate constant of the tetracycline hydrochloride (TC) degradation increased from 0.0505 to 0.0662 min–1 for 4Fe/1Zn-CN. The catalytic performance was more outstanding than those of similar catalysts reported. The catalytic mechanism was proposed. With the introduction of Zn2+ in 4Fe/1Zn-CN, the atomic percent of Fe (Fe2+ and Fe3+) and the molar ratio of Fe2+ to Fe3+ at the catalyst’s surface increased, where Fe2+ and Fe3+ were the active sites for adsorption and degradation. In addition, the band gap of 4Fe/1Zn-CN decreased, leading to enhanced electron transfer and conversion from Fe3+ to Fe2+. These changes resulted in the excellent catalytic performance of 4Fe/1Zn-CN. Radicals •OH, •O2–, and 1O2 formed in the reaction and took different actions under various pH values. 4Fe/1Zn-CN exhibited excellent stability after five cycles under the same conditions. These results may give a strategy for synthesizing Fenton-like catalysts.
研究领域:
材料科学
·
环境催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Xuanxuan Hua,Xiaodi Mao,Shuang Yang,Meijie Zhang,Lvping Fu,Cangjuan Han,Ao Huang,Huazhi Gu
Typical infrared (IR) radiation materials, such as spinel structure with transition metal doping , remain challenges on IR radiation performance and thermal stability. Inspired by manipulatable entropy with desired properties, (Mg 1/5 Co 1/5 Ni 1/5 Cu 1/5 Zn 1/5 )Al 2 O 4 (5MAl 2 O 4 ) with improved infrared radiation property and reduced thermal conductivity has been successfully synthesized. High-entropy strategy significantly narrows the band gap by impurity energy level formation, resulting in an improved 0.91 (0.78–2.5 μm). Simultaneously, 5MAl 2 O 4 emerges site inversion (tetrahedral and octahedral sites) and lattice distortion which benefits the outstanding infrared emissivity of 0.94 (2.5–15 μm, measured at 800 °C). Furthermore, 5MAl 2 O 4 reaches fairly low thermal conductivity of 2.1 W·m −1 ·K −1 , 4–5 times decrease compared with MAl 2 O 4 end members. The remarkable infrared emissivity and low thermal conductivity offer great potential in energy conservation and heat dissipation.
研究领域:
材料科学
·
热能工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
·
IF 10.9
Yi-bo Zhang,Ji-Sheng Liang,Chengyan Liu,Qi Zhou,Zhe Xu,Hong-bo Chen,Fu-cong Li,Ying Peng,Lei Miao
P-type Mg 3 Sb 2 -based Zintls have attracted considerable interest in the thermoelectric (TE) field due to their environmental friendliness and low cost. However, compared to their n-type counterparts, they show relatively low TE performance, limiting their application in TE devices. In this work, we simultaneously introduce Bi alloying at Sb sites and Ag doping at Mg sites into the Mg 3 Sb 2 to cooperatively optimize the electrical and thermal properties for the first time, acquiring the highest ZT value of ∼0.85 at 723 K and a high average ZT of 0.39 in the temperature range of 323–723 K in sample Mg 2.94 Ag 0.06 Sb 1.9 Bi 0.1 . The first-principle calculations show that the co-doping of Ag and Bi can shift the Fermi level into the valence band and narrow the band gap, resulting in the increased carrier concentration from 3.50 × 10 17 cm −3 in the reference Mg 3 Sb 0.9 Bi 0.1 to ∼7.88 × 10 19 cm −3 in sample Mg 2.94 Ag 0.06 Sb 0.9 Bi 0.1 . As a result, a remarkable power factor of ∼778.9 µW m − 1 K − 2 at 723 K is achieved in sample Mg 2.94 Ag 0.06 Sb 0.9 Bi 0.1 . Meanwhile, a low lattice thermal conductivity of ∼0.48 W m − 1 K − 1 at 723 K is also obtained with the help of phonon scattering at the distorted lattice, point defects, and nano-precipitates in sample Mg 2.94 Ag 0.06 Sb 0.9 Bi 0.1 . The synergistic effect of using the multi-element co-doping/-alloying to optimize electrical properties in Mg 3 Sb 2 holds promise for further improving the TE performance of Zintl phase materials or even others.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2021
·Vol. 104
·期 11
·5934-5945
·
IF 3.784
Zhenya Wang,Hao Guo,De Ning,Xiaobai Ma,Lirong Zheng,Dmitry Smirnov,Kai Sun,Dongfeng Chen,Limei Sun,Xiangfeng Liu
Li 4 T i5 O 12 (LTO) attracts great interest due to the “zero strain” during cycles but the poor electronic and ionic conductivity critically impede the practical application. Herein, we report a synergy strategy of tuning localized electrons to shift Fermi level and band gap by Mg/Zr co-doping and oxygen vacancy incorporation, which significantly improves Li + and electronic transport. More importantly, the intrinsic synergistic mechanism has been revealed by neutron diffraction, X-ray absorption spectra, and first-principles calculations. The “elastic effect” of lattice induced by Mg/Zr co-doping allows LTO to accommodate more oxygen vacancies to a certain degree without a severe lattice distortion, which largely improves the electronic conductivity. Mg/Zr co-doping and oxygen vacancy incorporation effectively enhanced the dynamic characteristics of LTO electrode, achieving the excellent rate performance (90 mAh/g at 20C) and cycle stability (96.9% after 500 cycles at 10C). First-principles calculations confirm Fermi level shifts to the conduction band, and the band gap becomes narrowed due to the synergistic modulation, and the intrinsic mechanism of the enhanced electronic and Li-ion conductivity is clarified. This study offers some insights into achieving the fast Li + insertion/extraction by tuning the crystal and electronic structure with lattice doping and oxygen vacancy engineering.
研究领域:
材料科学
·
电化学
·
理论计算
✓ 已验证
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2022
·
IF 10.508
Han Lin,Hideyuki Mitomo,Yusuke Yonamine,Zhiyong Guo,Kuniharu Ijiro
The emerging concept of tunable plasmonic chirality is mostly observed as a reconfigurable behavior or a feature of complex chiral plasmonic assemblies. For discrete colloidal particles, it is challenging to achieve reversible tunability or a transient response with regard to chiroptical activities, particularly in the visible or near-infrared region. Herein, we demonstrate a stimulus-responsive system based on chiral molecule–achiral plasmonic nanoparticles coated with polyaniline (PANI) as a variable dielectric layer, in which l-/d-cysteine molecules are introduced between the gold core and the shell as a static chiral source, allowing the chiral transfer effect to be greatly amplified by the hotspot gap of sub-monomolecular thickness. By taking advantage of the responsive properties to either pH or the electric potential dual stimuli of PANI, which also provides a stable and real-time switchable dielectric environment for the whole system, dynamic tuning of the plasmon and its induced chiroptical activities of core–gap–shell nanoparticles@PANI were precisely obtained. This well-defined design provides an open platform for flexible and rational tailoring of plasmonic cores, chiral molecules, and variable dielectrics to chiroptical needs, which is important for realizing applications in chemical sensing, chiral nanocatalysis, enantioselective separations, and novel optical devices.
研究领域:
纳米材料
·
光学
·
化学
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 12
·4903-4908
·
IF 4.569
Ling Luo,Linan Wang,Chen Bai,Jiazheng Zhou,Lai Wei,Xin Su
A Ga-enriched ternary alkali-metal sulfide Na4Ga8S14 has been synthesized by a high temperature solid-state reaction. It crystallizes in the centrosymmetric Pbca (no. 61) space group with cell parameters a = 13.5260(4) Å, b = 11.4979(3) Å, c = 29.9592(9) Å, and Z = 8, and exhibits a three-dimensional (3D) network structure constructed from unique [Ga12S42] 12-membered rings, one-dimensional ∞[Ga4S11] chains, individual [GaS4] units and Na+ ions. The experimental band gap of Na4Ga8S14 was measured as ∼3.57 eV. Theoretical calculations indicate that the title compound is a direct band gap compound and the band gap is mainly determined by [GaS4] units. Meanwhile, statistical analysis shows that the atomic ratio N (N = AIAII/Ga, where AI = alkali-metal, AII = alkaline earth-metal) can be used to regulate the connection of [GaS4] units from zero-dimensional (0D) isolated groups, one-dimensional (1D) chains, and two-dimensional (2D) layers to 3D frameworks in Ga-containing alkali- and/or alkaline earth-metal chalcogenides. The results enrich the diversity of alkali-metal sulfides and give an insight into the structural regulation of alkali- and/or alkaline earth-metal chalcogenides.
研究领域:
材料科学
·
固体化学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Cong Shen,Yanqing Zhu,Hong Tao,Jingling Li,Jianhua Zou,Lei Wang,Jingqiu Liang,Xiudi Xiao,Xueqing Xu,Gang Xu
InP quantum dots (QDs) with low toxicity are an ideal alternative to Cd-based QDs. However, the optical properties and stability of blue-emitting InP QDs are far inferior to those of red and green QDs. In this work, we report the synthesis of highly fluorescent InP/GaP/ZnS core/shell/shell QDs with an emission wavelength of 484 nm and photoluminescence quantum yield of 71%, along with a full width at half-maximum as narrow as 45 nm. In addition, we encapsulated the QDs with siloxane via specific ligand exchange and condensation reactions to improve their stability. The corresponding siloxane capping QD light-emitting device (QLED) shows a maximum luminance of 690 Cd m–2, an external quantum efficiency of 0.09%, and a much longer lifetime than pristine QDs. As a result, these enable the siloxane capping QDs to achieve a much stronger storage stability and a longer QLED lifetime than pristine QDs.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）