JOURNAL OF ELECTRONIC MATERIALS
·
2022
·Vol. 51
·期 12
·6885-6893
·
IF 2.047
Song Angang,Cao Guoqin,Zhu Di,Zhao Baofeng,Fu Zhenya,Cao Shuaiqi,Wang Qingjie,Hu Junhua
Nb-doped TiO 2 (NTO) thin films were sputtered on glass substrate followed by a simple annealing process in air. The photoelectric cooperative optimization was discussed based on the structural, optical and electrical characteristics. The influence of oxygen flow during deposition on materials chemistry and performance was analyzed. Hall measurement showed a strong dependence of transparent conductivity on the oxygen flow. Oxygen vacancies are related to the phase transitions from the rutile to anatase TiO 2 during annealing. The chemical states of Nb, Ti and O before and after annealing were discussed. The achievement of optimized transparent conductivity was resultant from the fine-tuning of the doped chemistry and special interplay of dopants and host lattice. Graphical
研究领域:
材料科学
·
薄膜技术
·
固体物理
·
光电材料
·
无机非金属材料
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2021
·
IF 3.196
Xiaoyi Zhang,Shengjie Jiang,Guoliang Lin,Hongyu Guo,Fafu Yang
In this article, two new tetraphenylethylene- rufigallol-tetraphenylethylene triads 7a and 7b were synthesized in yield of 50%. These compounds were characterized by mass spectrometry, NMR spectroscopy, and elemental analysis. Their mesomorphic behaviors were studied by polarizing optical microscopy, differential scanning calorimetry, and X-ray diffractometry. Investigation of their liquid crystalline behaviors indicated that compounds 7a and 7b possessed the hexagonal columnar mesophase. Compound 7b with dodecyl chains exhibited the low phase transition temperatures and wide range of mesophase temperatures in comparison with compound 7a . Compounds 7a and 7b exhibited excellent aggregation-induced emission in H 2 O/THF solution. The fluorescence quantum yields of these compounds in the solid state were 22% and 16%, respectively. Results from this study suggest that symmetrical trimer was a good approach to construct novel fluorescence columnar liquid crystals.
研究领域:
材料化学
·
有机化学
✓ 已验证
DOI
高影响因子
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2024
·
IF 2.2
Shu-Yue Xie,Bao-Han Li,Jia-Qi Li,Jiu-Jiang Dong,Xiao-Chen Ren,Bo Zhang,Jun Li,Xiao-Ying Huang
Employing metal complex cations as the structural modifiers, three new numbers of hybrid halobismuthates family, namely [NH4][Co(phen)3]BiI6 (phen = 1,10-phenanthroline; 1), [Zn(phen)2Br][Bi(phen)Br4]·H2O (2) and [Cu(2,2'-bipy)2Br][Cu(2,2'-bipy)2Bi2Br9]·H2O (2,2'-bipy = 2,2'-bipyridine; 3) have been solvothermally constructed and structurally characterized. X-ray crystallography analyses show that all compounds characteristic of abundant weak interactions feature the discrete anionic motifs. The obtained hybrid materials possess the semiconducting nature, with the visible light responding optical band gaps of 2.13−2.71 eV. Under the alternating light irradiation, they exhibit excellent photoelectric switching properties, whose photocurrent densities (0.85, 0.24 and 0.43 μA/cm2 for compounds 1−3, respectively) compare well with some high-performance halobismuthate competitors. Further theoretical calculations of compound 1 reveal that the photosensitive [Co(phen)3]2+ cations contribute greatly to the bottom of conduction bands (CBs) and the top of valence bands (VBs), which may be the important reason for its excellent photoelectric behavior. The analyses of Hirshfeld surface, thermal stability and X-ray photoelectron spectroscopy were also discussed detailedly in this paper.
研究领域:
材料化学
·
晶体学
·
理论化学
✓ 已验证
DOI
高影响因子
EES Catalysis
·
2024
·
IF 0
Xiao Yu,Chuang Zhao,Lixia Yang,Jian Zhang,Chunlin Chen
The Pt-Mn2O3/CN catalyst formed through the synthesis via the solvent-thermal method involves a synergistic combination of polymer CN and Pt nanoparticles loaded on Mn2O3 to catalyze the degradation of toluene. The composition incorporates Mn2O3 as the central element for photothermal conversion, CN as a uniformly dispersed matrix for Pt nanoparticles, and Pt as the catalytically active center, demonstrating significant efficacy. Particularly noteworthy is the discernible enhancement in the photothermal catalytic degradation capability of the Pt-Mn2O3/CN composite catalyst, specifically in the context of toluene. When subjected to light intensity of 300 mW cm-2 and a toluene concentration of 400 ppm, Pt-Mn2O3/CN achieves toluene conversion and CO2 mineralization rates of 99% and 80.9%, respectively. This improvement primarily stems from the Pt nanoparticles inducing a substantial presence of oxygen vacancies within the catalyst structure, thereby increasing oxygen adsorption capacity and surface mobility. This, in turn, activates adsorbed oxygen species at the catalyst’s interface. The adept utilization and conversion of solar irradiance for volatile organic compound (VOC) abatement underscore its potential as an environmentally friendly and renewable energy source.
研究领域:
环境科学
·
材料化学
·
催化化学
✓ 已验证
DOI
Water Cycle
·
2024
·
IF 0
Guoting Li,Haozhe Li,Shude Zhang,Xiao Mi,Yujie Guo,Zhixin Song,Yuhao Liu,Hongwei Pan,Baogui Wang,Yingxu Liu,Weigao Zhao,Tannaz Pak
Mn oxides are confined within the porous structure of activated coke (ACO) via impregnation followed by calcination treatment. The Mn-ACO sample calcined at 600°C (Mn-ACO600) demonstrated superior performance despite containing only a minute atomic ratio of 0.11% Mn on its surface. This treatment led to a slight increase in the specific surface area and pore volume of ACO, with a significant enhancement in the proportion of micropores, rising from 54.2% in ACO to 71.8% in Mn-ACO600. Raman spectroscopy indicated additional defects in Mn-ACO, while XPS analysis confirmed the coexistence of Mn(II), Mn(III), and Mn(IV) oxides. Although ACO adsorption alone was ineffective in removing acesulfame (ACE), Mn-ACO600 achieved a removal rate of 19.0%. The introduction of peroxydisulfate (PDS) further boosted the degradation of Mn-ACO600, with a K app value that was 2.28 times of that of the combined Mn-ACO600 adsorption and PDS oxidation process, indicating a remarkable synergistic effect. To optimize the experimental conditions, a response surface methodology design analysis was conducted, revealing that solution pH and the dosage of Mn-ACO600 were crucial factors. Furthermore, the study confirmed non-radical oxidizing species, such as 1 O 2 and h + , played a predominant role in the process, with relatively minor contributions from radical oxidizing species.
研究领域:
环境科学
·
材料化学
·
化学工程
✓ 已验证
DOI
Applied Catalysis O: Open
·
2024
·
IF 0
Xue Zhang,Baowei Zhao,Yetong Liu,Min Yao,Yanjuan Li,Nan Wu
Sonochemistry was used to improve the degradation performance of trace antibiotics in water by the adsorption-catalytic oxidation system composed of Nitrogen-doped cyclodextrin reduced graphene oxide (N-β-rGO) and peroxymonosulfate (PMS). The results indicated that after loading ultrasound, >90% of antibiotics such as SMZ, LVX, CLI, TC, PEN, and CHL were removed within 10 min. Increasing the sound intensity, raising the system temperature, and increasing the initial PMS concentration all improved the strengthening effect. Among them, the removal rate was enhanced by >10% under low pH conditions. Moreover, the calculated enhancement factor of ultrasound enhancement was >1.30. The magnitude of the enhancement effect was correlated with the logP of antibiotics.
研究领域:
环境科学
·
水处理技术
·
材料化学
✓ 已验证
DOI
Nature Water
·
2023
·Vol. 1
·期 12
·1068-1078
·
IF 0
Wang Kaifeng,Mao Ran,Liu Rui,Zhang Juanjuan,Zhao Huachao,Ran Wei,Zhao Xu
The electroreduction of nitrate to ammonia is particularly important in mitigating environmental pollution and obtaining value-added products. Although non-toxic and inexpensive iron-based materials are expected to be a promising catalyst for electrochemical nitrate reduction, ensuring their sustained high activity and inhibiting spontaneous corrosion requires the implementation of complex design. Here we report an economical self-corrosion approach that utilizes Ni 2+ ions in wastewater to control the formation of NiFe layered double hydroxide active phase on iron surface, resulting in high nitrate conversion (97.2%) and ammonia selectivity (90.3%). Coupling nitrate reduction with acid absorption, the conversion from NO 3 − to (NH 4 ) 2 SO 4 (s) for applications such as acting as fertilizer are achieved. This distinctive ‘waste-to-treasure’ perspective not only challenges the conventional belief that corrosion diminishes active phase but also notably improves catalytic efficiency while harnessing valuable resources from wastewater, offering a practical method for converting nitrate to useful ammonia products.
研究领域:
环境科学
·
材料化学
·
电化学
·
催化化学
✓ 已验证
DOI
ACS Catalysis
·
2014
·
IF 7.572
Le Xu,Chen-geng Li,Kun Zhang,Peng Wu
Tandem catalysis has been realized on the multilayered zeolites with organic-structure-directing agent (OSDA) molecules occluded within micropores. A combination of mild acid treatment and ion-exchange with ammonia solution was carried out on as-synthesized multilamellar MFI aluminosilicate, giving rise to an acid–base bifunctional catalyst. Containing tripropyl head groups, the Gemini-type quaternary ammonium OSDAs were firmly immobilized in the intersection of straight and sinusoidal 10-membered ring channels, with the other one exposed to the layer surface of the nanosheets. The resulting organic–inorganic materials possessed simultaneously the acid sites related to the framework Al and the base sites derived from coexisting OSDAs. In particular, two types of base sites were present, that is, the Lewis base sites due to the SiO– species and Brønsted base sites due to the OH– counteranion of exposed quaternary ammonium cations. The rigid materials were highly active and reusable in the one-pot reaction of tandem deacetalization–Knoevenagel condensation. Supporting palladium nanoparticles (Pd NPs) on the organic–inorganic hybrid zeolite led to bifunctional catalysts, which catalyzed effectively one-pot synthesis of benzylidene malononitrile from benzyl alcohol under soluble-base-free conditions, in which the benzyl alcohol was first aerobic oxidized to intermediate benzaldehyde followed by Knoevenagel condensation with malononitrile.
研究领域:
材料化学
·
催化化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2022
·
IF 4.119
Jinbo Ouyang,Xiaohong Xing,Limin Zhou,Chuntao Zhang,Jerry.Y.Y. Heng
Vanillin (VAN) is widely used in medicine, food and optoelectronics, but its low solubility leads to the decrease of bioavailability and increase of application costs. Three APIs-nicotinamide (NIC), isonicotinamide (INM) and isoniazid (INH) were chosen to form cocrystals with VAN, aiming at improving the solubility of VAN and APIs simultaneously. Two cocrystals (VAN-NIC, VAN-INM) were obtained through cocrystallization while VAN reacted with INH to form one novel compound (VAN-INH). The crystal structures were characterized by single-crystal X-ray diffraction (SCXRD), Powder X-ray diffraction (PXRD), Fourier-Transform Infrared Spectroscopy (FT-IR) and Differential Scanning Calorimetry (DSC). The melting temperatures of VAN-NIC and VAN-INM cocrystals are between this of VAN and APIs. Compared with pure VAN and APIs, the solubility and dissolution rate of VAN-NIC and VAN-INM are significantly increased. The melting temperature of VAN-INH is greater than that of VAN and INH, and the solubility and dissolution rate is not increased significantly. The intermolecular energy between VAN and APIs as well as lattice energies of cocrystals/novel compound were computed to elucidate the formation mechanism and stability. The present investigation opens a new pathway for the development of natural product-drug cocrystals to improve solubility and dissolution rate of natural product .
研究领域:
药学
·
材料化学
·
计算化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
·
2022
·Vol. 35
·期 1
·04022362
·
IF 3.651
Ming Zhang,Luyan Wang,Xiuzhi Zhang,Xiangyun Mi,Fengmeng Sun,Zhenzhen Fang,Meishan Pei
In this study, sodium hypophosphite (SHP) was used to modify polycarboxylate superplasticizer (P-PCE), and the properties of P-PCE on β-calcium sulfate hemihydrate (β-HH) were systematically investigated. The results showed that P-PCE could exhibit better fluidity and more retarding effect compared with the conventional polycarboxylate superplasticizer (C-PCE). The reason might be ascribed to the higher adsorption ability of P-PCE because of its stronger complexing capacity with calcium ion, which was induced by the phosphonate and phosphinate groups in the P-PCE molecule. Additionally, PCE played an important function in hindering the calcium sulfate dehydrate (DH) crystallization instead of the dissolution of β-HH, resulting in the retarding effect. This new type of PCE can show great potential in gypsum engineering.
研究领域:
建筑材料学
·
材料化学
✓ 已验证
DOI
高影响因子
ORGANIC ELECTRONICS
·
2017
·
IF 3.399
Renren Fang,Ru Chen,Jianhua Gao,Huarong Zhang,Hongzhuo Wu,Hongxiang Li
To explore how the different intermolecular non-covalent interactions synergistically affect the molecular packing and properties when they existed at the same molecules. A series of new pyrene derivatives with chalcogen atoms as bridges were designed and synthesized. The single crystal structures of the compounds revealed the significant effect of different intermolecular non-covalent interactions on the molecular packing. The thin film transistor devices were fabricated and exhibit high mobility over 0.04 cm 2 V −1 s −1 . The distinct difference of the OFETs performance suggests that the intermolecular non-covalent interactions have very important effect on gearing the molecular packing and properties.
研究领域:
材料化学
·
有机电子学
✓ 已验证
DOI
高影响因子
TETRAHEDRON
·
2014
·
IF 2.817
Junwei Shi,Yafei Wang,Manjun Xiao,Ping Zhong,Yu Liu,Hua Tan,Meixiang Zhu,Weiguo Zhu
To explore the influence of mesogenic unit on the liquid crystals and luminescence properties of metal complex , two novel triphenylene-based platinum complexes of TppyPtacac and TppyPtPhacac featuring donor–acceptor framework have been designed and synthesized, in which Tppy is triphenylene–phenylpyridine skeleton and acac/Phacac is pentane-2,4-dione derivative. Differential scanning calorimetry (DSC), polarized optical microscopy (POM) and X-ray diffraction (XRD) techniques demonstrate the complex TppyPtPhacac shows a column mesophase in the region of 55–110 °C. Both platinum complexes exhibit intense emission at about 550 nm in CH 2 Cl 2 solution. Compared to the analogous platinum complexes without triphenylene unit, TppyPtacac and TppyPtPhacac display a remarkable red-shifted emission profiles (ca. 50 nm) due to strong intramolecular charge transfer. Furthermore, the hole mobilities up to 2.5×10 −4 cm 2 V −1 s −1 and 2.99×10 −5 cm 2 V −1 s −1 are achieved for the annealed film of TppyPtacac and TppyPtPhacac, respectively, which is one of the highest hole mobility with respect to cyclometalated platinum complexes.
研究领域:
材料化学
·
配位化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）