Materials
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2024
·Vol. 17
·期 19
·4804
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IF 3.1
Fan Zhang,Qiwen Zhang,Feng Zhang,Xiaolin Luo,Wei Wang
N-heterocycles with quinoline structures hold significant importance within the chemical and pharmaceutical industries. However, achieving their efficient transformations remains a vital yet challenging endeavor. Herein, a series of W-doped Ga2O3-NC catalysts were synthesized using a Ga-MOF-derived strategy through a simple solvothermal method, with a remarkably high activity and selectivity towards the oxidative dehydrogenation ofN-heterocycles. Furthermore, the MOF-derived W-doped Ga2O3-NC catalysts exhibit remarkable substrate tolerance and recyclability. The outstanding catalytic activity was attributed to the robust synergistic interaction between the W species and the Ga2O3-NC carrier, which facilitates the activation of hydrogen atoms in the C-H and C=N bonds on both the oxygen molecule and the substrate to produce H2O2. Additionally, the solvent effect of methanol can significantly enhance dehydrogenation due to its strong ability to donate and accept protons of hydrogen bonding. The present work provides a new approach to MOF-derived non-precious metal catalysts for achieving the efficient oxidation dehydrogenation ofN-heterocycles.
研究领域:
化学工程
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催化科学
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材料科学
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DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Ying Li,Yong Hong Ma,Aihua Mao,Xiwei Qi
A series of transparent (1- y )La 2 O 3 –Ga 2 O 3 - y Sm 2 O 3 - x Eu 2 O 3 (where x = 0, 0.02, 0.04, 0.06, 0.08, 0.10, 0.12, 0.14, and y = 0, 0.04) were successfully synthesized using a containerless solidification process. Co-doping with Sm 3+ and Eu 3+ enhanced the energy absorption of Eu 3+ , notably improving the characteristic emission peak 5 D 0 - 7 F 2 of Eu 3+ . The peak emission intensity for y = 0.04 was observed at x = 0.08, attributable to the concentration quenching of Eu 3+ ions. As the concentration of Eu 3+ increased, the energy transfer effect on emission intensity diminished. Attributed to the energy transfer between Sm 3+ and Eu 3+ , Sm 3+ may primarily serve as the sensitizer, and Eu 3+ as the activator. According to the Dexter theory, which suggests that the interaction between activator ions and their adjacent ions is the primary mechanism of energy transfer and quenching among Eu 3+ ions and adjacent ions, an increase in Eu 3+ concentration leads to a decrease in the distance between Eu 3+ and adjacent ions, strengthening their interaction, and potentially inducing concentration quenching. Furthermore, with an increase in Eu 3+ concentration, the CIE chromaticity coordinates for the samples co-doped with Sm 3+ and Eu 3+ shifted significantly, enhancing the color purity of the emitted light and bringing it closer to the NTSC color standard coordinates (0.67, 0.33).
研究领域:
材料科学
·
光学
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DOI
高影响因子
Nanoscale Horizons
·
2026
·
IF 6.4
Liyan Wang,Kaijun Feng,Shuai Liu,Jiehui Tian,Xiangdong Guo,Lin Geng,Yuchuan Xiao,Debo Hu,Lixing Kang,Qing Dai
Twist-polaritonics provides precise control of light-matter states through the stacking of atomically smooth, anisotropic layers, but has been restricted to the van der Waals (vdW) crystals. Non-vdW crystals, despite their symmetry-broken dielectric responses ideal for exotic polaritons, are challenging to prepare as suitable flakes due to their rigid 3D bonding networks, thus limiting the implementation of deep-subwavelength twist-polaritonics. We established a non-vdW polaritonic platform using ultrathin, single-crystalline β-Ga2O3 nanoflakes synthesized by exploiting its anisotropic bonding hierarchy on the quasi-layered (100)B plane. These flakes exhibited deep-subwavelength polariton confinement beyond λ/20. Moreover, their atomic-scale flatness enabled the assembly of twisted bilayers, in which we observed a topological transition of the polariton dispersion from hyperbolic to elliptical, directly controlled by the twist angle. This work positions β-Ga2O3 as a high-performance nanophotonic platform beyond the vdW family, while proposing that anisotropic bonding hierarchy provides a general strategy to unlock non-vdW twist-polaritonic functionality in a wide range of bulk crystals.
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高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2025
·
IF 4.7
Rui Geng,Xianjun Niu,Yajie Liu
HZSM-5 zeolite is extensively used in methanol-to-aromatics (MTA) reactions; however, its low aromatics selectivity limits its performance due to weak intrinsic aromatization ability. In this study, a series of bifunctional x -Ga 2 O 3 /HZSM-5 were synthesized by mechanically mixing different Ga 2 O 3 isomers with HZSM-5 to systematically investigate the influence of the crystal structure on methanol aromatization. Among them, β-Ga 2 O 3 /HZSM-5 catalyst exhibited the highest aromatic selectivity, reaching 40 mol%. Structural characterization by XRD, N 2 adsorption, XPS, H 2 -TPR, XANES, and EXAFS analyses revealed that the dispersion and reducibility of extra-framework Ga 3+ species varied with the Ga 2 O 3 structure. In particular, the monoclinic β-Ga 2 O 3 exhibited a pronounced interaction with Brønsted acid sites of HZSM-5, promoting the formation of highly active and stable four-coordinated [Ga 2 O 2 ] 2+ dimers. These species functioned as efficient dehydrogenation and cyclization centers, thereby markedly promoting aromatics production.
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高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 15
·
IF 5.719
Asha Yadav,Bo Fu,Stephanie Nicole Bonvicini,Linh Quy Ly,Zhitai Jia,Yujun Shi
β-Ga2O3nanostructures, including nanowires (NWs), nanosheets (NSHs), and nanorods (NRs), were synthesized using thermally dewetted Au nanoparticles as catalyst in a chemical vapor deposition process. The morphology of the as-grownβ-Ga2O3nanostructures depends strongly on the growth temperature and time. Successful growth ofβ-Ga2O3NWs with lengths of 7–25 μm, NSHs, and NRs was achieved. It has been demonstrated that the vapor–liquid–solid mechanism governs the NW growth, and the vapor–solid mechanism occurs in the growth of NSHs and NRs. The X-ray diffraction analysis showed that the as-grown nanostructures were highly pure single-phaseβ-Ga2O3. The bandgap of theβ-Ga2O3nanostructures was determined to lie in the range of 4.68–4.74 eV. Characteristic Raman peaks were observed with a small blue and red shift, both of 1–3 cm−1, as compared with those from the bulk, indicating the presence of internal strain and defects in the as-grownβ-Ga2O3nanostructures. Strong photoluminescence emission in the UV-blue spectral region was obtained in theβ-Ga2O3nanostructures, regardless of their morphology. The UV (374–377 nm) emission is due to the intrinsic radiative recombination of self-trapped excitons present at the band edge. The strong blue (404–490 nm) emissions, consisting of five bands, are attributed to the presence of the complex defect states in the donor (VO) and acceptor (VGaor VGa–O). Theseβ-Ga2O3nanostructures are expected to have potential applications in optoelectronic devices such as tunable UV–Vis photodetectors.
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DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2024
·
IF 2.8
Fan Zhao,Huiling Du,Zhuo Li,Qianqian Li,Jie Lu,Na Cao,Yupu Shi
Ga 2 O 3 has been used as an anode for lithium batteries due to its high theoretical capacity. However, limited electronic conductivity and severe volume expansion limit its application. Herein, to circumvent these issues, we proposed to design multiscale interface of Ga 2 O 3 @rGO. It was synthesized to achieve superior multiplicative performance (218 mAh g −1 at 5.0 A g −1 ) and cycling performance (428.7 mAh g −1 after 100 cycles at 100 mAh g −1 ). These findings suggest that the nanoscale morphology of Ga 2 O 3 and nanographene work together to promote electron transfer, ultimately enhancing the cycling stability of the composites.
研究领域:
材料科学
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储能
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纳米技术
·
电化学
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DOI
高影响因子
Journal of the American Chemical Society
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2022
·
IF 16.383
Hongyu Chen,Pan Gao,Zhengmao Liu,Lixin Liang,Qiao Han,Zhili Wang,Kuizhi Chen,Zhenchao Zhao,Meiling Guo,Xuebin Liu,Xiuwen Han,Xinhe Bao,Guangjin Hou
Surface metal hydrides (M–H) are ubiquitous in heterogeneous catalytic reactions, while the detailed characterizations are frequently hindered by their high reactivity/low concentration, and the complicated surface structures of the host solids, especially in terms of practical solid catalysts. Herein, combining instant quenching capture and advanced solid-state NMR methodology, we report the first direct and unambiguous NMR evidence on the highly reactive surface gallium hydrides (Ga–H) over a practical Ga2O3 catalyst during direct H2 activation. The spectroscopic effects of 69Ga and 71Ga isotopes on the 1H NMR signal are clearly differentiated and clarified, allowing a concrete discrimination of the Ga–H signal from the hydroxyl crowd. Accompanied with quantitative and two-dimensional NMR spectroscopical methods, as well as density functional theory calculations, information on the site specification, structural configuration, and formation mechanism of the Ga–H species has been revealed, along with the H2 dissociation mechanism. More importantly, the successful spectroscopic identification and isolation of the surface Ga–H allow us to clearly reveal the critical but ubiquitous intermediate role of this species in catalytic reactions, such as propane dehydrogenation and CO2 hydrogenation reactions. The analytic approach presented in this work can be extended to other M–H analysis, and the insights will benefit the design of more efficient Ga-based catalysts.
研究领域:
催化化学
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材料科学
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物理化学
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DOI
PubMed
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2022
·
IF 4.778
Tianxiang Ning,Qian Zhang,Piao Liu,Xiangtao Lin,Yinyi Luo,Lidan Liu,Zhiwei Luo,Anxian Lu
In this study, Li 2 O–Ga 2 O 3 -GeO 2 -Gd 2 O 3 (LGGG) glass is doped into Li 7 La 3 Zr 2 O 12 (LLZO) ceramic in proportions of 1, 2, 3, 4, and 5 wt% by a conventional solid-state reaction method. The main crystalline phase that existed in this composite electrolyte is proved to be cubic phase LLZO by XRD patterns. With a dosage of 3 wt% LGGG glass, the composite electrolyte has the highest ionic conductivity of 3.26 × 10 −4 S cm −1 , a maximum relative density of about 96.79%, and minimum activation energy of 0.276 eV at room temperature. This work also verifies that doping the same amount of identified elements into LLZO ceramics in the form of glass can obtain higher ionic conductivity and relative density than in the form of oxides (2.40 × 10 −4 S cm −1 and 92.03%). A symmetric cell composed of this electrolyte reveals a good cycling performance and low overpotential in a total of 230 cycles at a current density of 0.125 mA cm −2 . These results confirm the potential of this LGGG-LLZO composite electrolyte for applicating in new generation all-solid-state lithium-ion batteries.
研究领域:
材料科学
·
能源存储与转换
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DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2023
·
IF 5.5
Shu-Zhen Zhou,Xin-Qian Gao,Fan Wu,Wen-Cui Li,An-Hui Lu
With the demand for propene and the development of shale gas, propane dehydrogenation is an effective strategy to tackle the tight propene supply. Ga-based catalysts have immense potential for propane dehydrogenation among many environmentally friendly non-precious metal catalysts. Herein, we found that the hydrogen co-feeding not only significantly improved the activity but also enhanced the stability of Ga/Al-R catalyst for propane dehydrogenation. The propane conversion rates at zero reaction time at a hydrogen concentration of 10% was 81 mmol C3H8 g cat −1 h −1 , almost twice as high as in the absence of hydrogen (43.8 mmol C3H8 g cat −1 h −1 ). In addition, co-feeding with hydrogen significantly enhanced catalyst stability and resistance to carbon deposition. In-situ IR spectroscopy confirmed that the addition of hydrogen could effectively contribute to the production and enrichment of GaHx species. The H 2 -D 2 exchange and elimination of GaHx species by CO 2 experiments demonstrated that GaHx species was the more active site for PDH over Ga/Al-R catalyst.
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高影响因子
JOURNAL OF THE TEXTILE INSTITUTE
·
2025
·
IF 1.5
Yuqing Liu,Wenkun Chen,Jin Dai,Fan Wu,Fei Wang,Jianyong Yu,Yi-Tao Liu,Bin Ding
Photocatalysis is emerging as a promising technological pathway in wastewater treatment due to its environmental friendliness and advantages in azo dye degradation. However, the catalytic efficiency remains insufficient due to limited light absorption range and high rate of recombination of photogenerated carriers and holes. Nowadays, wide bandgap semiconductor materials are attracting increasing interests for their stronger redox capabilities. Here, we successfully fabricate amorphous Ga2O3 nanofibers by iron and block copolymer modulation coupled with electrospinning and thermal treatment. The abundance of oxygen vacancies (OVs) in amorphous matrix, porous physical structure and optimized electron density distribution by iron doping synergistically improve the adsorption and photogenerated carrier separation, exhibiting excellent activity and stability over multiple cycles. This study offers an enlightening insight for the efficient degradation of azo dyes.
研究领域:
材料科学
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环境科学
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物理化学
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纳米科技
·
光催化
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产品关联
DOI
高影响因子
Journal of Physical Chemistry Letters
·
2025
·
IF 4.6
Ruan Zhang,Shuai Liu,Xianyu Hu,Yong Zhang,Yunlei Zhong,Qing Guo,Xiyuan Feng
In the post-Moore era, next-generation optoelectronics and neuromorphic computing systems require ultrawide bandgap semiconductors with tunable properties. β-Ga2O3 stands as a promising candidate, possessing a bandgap of 4.5–4.9 eV and a high critical electric field of ∼ 8 MV/cm. However, its practical application is hindered by difficulties in synthesizing high-quality 2D forms and optimizing metal–semiconductor contacts. In this study, highly crystalline ultrathin 2D β-Ga2O3 nanoflakes with improved interface quality and enhanced carrier transport dynamics were synthesized using a space-confined CVD approach. The nanoflakes exhibit excellent structural and crystalline quality, as evidenced by the characteristic peaks in Raman spectroscopy and XRD, along with the clear lattice structure observed via TEM. Metal–semiconductor–metal devices with Ti–Ti, Pd–Pd, and Ti–Pd electrode configurations were fabricated and evaluated through current–voltage and time-resolved current–time measurements. The results reveal that the Schottky barrier height at the metal–Ga2O3 interface plays a decisive role in device performance. Notably, the Ti–Ti device exhibited a distinctive two-stage photocurrent decay after light illumination ceased, attributed to defect-mediated trapping and release of photogenerated carriers. By incorporating this unique photoresponse behavior into a deep neural network, promising image recognition accuracy was achieved on the Modified National Institute of Standards and Technology data set. This work not only offers a reliable pathway for synthesizing high-quality 2D β-Ga2O3 but also demonstrates its potential for application in high-performance optoelectronics and neuromorphic computing.
研究领域:
光电子学
·
材料科学
·
纳米技术
·
神经形态计算
·
半导体器件
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PubMed
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2019
·
IF 2.291
Lulu Huang,Jun Guo,Zhen-Hua Ge,Yehua Jiang,Jing Feng
The In 2 O 3 (ZnO) 3 + x mol%Ga 2 O 3 ( x = 0, 0.1, 0.3, 0.5, 1) ceramics were synthesized by a solid-state reaction process. The effect of Ga doping on the thermoelectric properties of the In 2 O 3 (ZnO) 3 ceramics was studied. The phase structure and microstructure of all the bulk samples were checked by X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM), respectively. Additionally, the minimum thermal conductivity of 1.45 Wm −1 K −1 at 973 K is obtained for 0.5% Ga-doped sample, which is 35% lower than that of the pristine sample. The significantly decreased thermal conductivity for Ga 2 O 3 -doped sample is due to the enhanced scattering of phonons , which is derives from the point defects caused by Ga-doping and the introduction of the second phase. As a result, the In 2 O 3 (ZnO) 3 +0.5 mol% Ga 2 O 3 sample achieved the highest ZT value of 0.23 at 973 K.
研究领域:
材料科学
·
热电学
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陶瓷
·
固态化学
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DOI
高影响因子
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