ACS Omega
·
2022
·
IF 4.132
Xiaofei Li,Xin Ding,Yuhang Du,Chao Xiao,Kang Zheng,Xianglan Liu,Xingyou Tian,Xian Zhang
Liquid metals (LMs) are playing an increasingly important role in the fields of flexible devices, electronics, and thermal management due to their low melting point and excellent thermal and electrical conductivity, and the transformation of LMs in deionized water has recently received much attention. In this paper, we investigate the transformation process of EGaIn microspheres in deionized water and propose a two-step process of microspherical transformation, whereby the microspheres are first deformed into a spindle shape and then into lamellar nanorods. It is also shown that the growth of GaOOH crystals drives the transformation. Based on this result, EGaIn microspheres with controllable transformation could be prepared, such as spindle or lamellar rod shapes, extending the application area of LMs.
研究领域:
材料科学
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纳米技术
·
化学工程
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DOI
PubMed
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Huijuan Wu,Lili Chen,Suiting Ning,Xiaodie Zhao,Shuping Deng,Ning Qi,Feng Ren,Zhiquan Chen,Jing Tang
In this paper, Ga-doped In2O3 (IGO) was synthesized using a hydrothermal method combined with spark plasma sintering (SPS) treatment. Nanosized pore structures were successfully introduced into IGO. A high porosity of 67.2% is obtained in the In1.82Ga0.18O3 sample consolidated by SPS sintering at a relatively low temperature of 500 °C. With further increasing sintering temperature, the porosity decreases gradually and reaches 10.1% at 1000 °C. Positron annihilation measurements confirm the decrease of porosity in IGO with increasing sintering temperature and reveal that there are still considerable amounts of nanopores even after sintering at 1000 °C. The nanopores in IGO act as strong phonon scattering centers, which lead to an extremely low thermal conductivity of 0.21 W m–1 K–1 at room temperature for IGO sintered at 500 °C. This thermal conductivity is nearly 2 orders of magnitude lower than that of the fully densified bulk In2O3 and is also the lowest value reported so far. Although the electrical conductivity of IGO is deteriorated by the pore structure, it is overcompensated by the extremely low thermal conductivity. As a result, a high ZT of 0.383 is obtained at 800 °C in this sample. Our results indicate that the pore structure can be a competitive strategy to achieve a high ZT value for thermoelectric materials.
研究领域:
材料科学
·
能源科学
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DOI
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 36
·12156-12162
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IF 6.4
Kun Huang,Lihao Guo,Li Liu,Ximeng Chen,Chen Su,Peipei Li,Zhiyong Deng,Weiwei Wu,Lu Zhang
Two-dimensional gallium oxide (Ga2O3) is a promising material with diverse applications, but its development and application are hindered by the complicated synthesis process of 2D Ga2O3 film. However, the van der Waals printing method, which employs liquid metal as a platform, can simply synthesize large-scale and high-quality 2D oxide films with ease. Moreover, the band structure of oxide films can be modulated through doping during the printing process, broadening their applications. In this study, pure and doped Ga2O3 films have been successfully synthesized by using Bi–Ga alloys with different ratios (0 wt% Bi, 1 wt% Bi, 10 wt% Bi, 15 wt% Bi) via the van der Waals printing method. Furthermore, the modulation of the band structure of Ga2O3 films by doping ranging from 5.23 eV to 4.88 eV is systematically investigated. Photodetectors based on Ga2O3 films with a controllable band structure have been fabricated, which demonstrated good sensing performance with a responsivity of 959 mA W−1, detectivity of 3.43 × 1011 Jones, and response/recovery time of 13 ms/18 ms. This printing method provides a straightforward, low-cost, and high-efficiency strategy for synthesizing and doping 2D oxide films, which could advance their practical applications.
研究领域:
材料科学
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电子工程
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产品关联
DOI
高影响因子
IEEE SENSORS JOURNAL
·
2025
·
IF 4.5
Jianxun Dai,Taisen Ye,Xuedong Zhan,Shancheng Han,Bin Ma,Hongyan Hai,Yanhong Liu,Pengcheng Tao,Dawei Li,Fengli Wang,Rong Han,Zhiguo Zhang,Yue Chen,Hao Zheng,Lili Geng,Rui Zhang,Huolin Huang
The analysis of human breath to detect both respiration state and breath biomarkers is of great importance in the fields of exhaled noninvasive breath monitoring and diagnosis. Thus, we have elaborately synthesized gallium oxide (Ga2O3) with different oxygen species as humidity and gas sensitive materials to monitor respiratory function and ammonia (NH3). In this work, the sensing characteristics and breath monitoring applications of the humidity/ammonia sensor based on the Ga2O3 are systematically investigated. The humidity sensor demonstrated high responsivity (over 3 orders of magnitude), low humidity hysteresis (1.83%) and good long-term stability. The ammonia sensor has a response of 1.2% to 2 ppm ammonia at 70% RH. To investigate the potential application of the sensor in detecting ammonia in exhaled gas, a simulated breath test was conducted.
研究领域:
医学诊断
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材料科学
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传感技术
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产品关联
DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 19
·4804
·
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
·
催化科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2022
·
IF 5.723
Yitao Zhao,Junjun Cheng,Peng Zhang,Xinhui Liu,Jianguo Zhuang,Yijun Yu,Qichao Zhao,Yuchen Wang,Xuedong Zhu,Fan Yang
Alkylation of benzene with carbon dioxide (CO 2 ) is significant for converting greenhouse gas and surplus benzene into value-added toluene and xylene. Herein, a bifunctional catalyst comprising Zn/Ga oxides and HZSM-5 zeolite was developed to efficiently promote the methylation of benzene with CO 2 and H 2 . This catalytic system exhibited excellent performance at 425 ℃ and 3.0 MPa, through which benzene conversion of 39.1% and total xylene/toluene selectivity of 92.7% have been achieved. Furthermore, the catalysts are carefully characterized; compositions of Zn/Ga oxides and Si/Al ratios of HZSM-5 zeolite are recognized as decisive factors for reaction activity and selectivity respectively. Additionally, primary reaction pathways are explored and testified to provide detailed understanding for the establishment of reaction networks, especially for mechanisms of ethylbenzene evolution. These findings are able to provide more deep insights into the process of benzene alkylation, which further facilitates the emergence of effective catalysts with potential industrial applications.
研究领域:
催化化学
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环境科学
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DOI
高影响因子
ChemCatChem
·
2018
·Vol. 10
·期 24
·5637-5648
·
IF 4.674
Zhiquan Hou,Yuxi Liu,Jiguang Deng,Yue Lu,Shaohua Xie,Xiuzhong Fang,Hongxing Dai
Graphical Effective synergy : The Pd−GaO x /Al 2 O 3 catalysts are prepared via the oxidative transformation of intermetallic Pd 5 Ga 3 nanocrystals supported on Al 2 O 3 . A synergistic effect between palladium and gallium oxide via formation of a bi-functional active Pd−O−Ga phase is observed, resulting in a highly active and exceptionally stable catalyst that can markedly suppress the sintering of noble metals under harsh conditions. Surface oxygen vacancies and the surface Pd−O−Ga phase are the catalytically active sites. Catalytic combustion of methane is widely used in industrial and transportation activities. The commonly used Pd-based catalysts, however, are easily deactivated under hydrothermal conditions. In this work, we adopted a novel strategy to prepare a GaO x -doped Pd/Al 2 O 3 catalyst via the oxidative transformation of intermetallic Pd 5 Ga 3 nanocrystals supported on γ -Al 2 O 3 . We observed a synergistic effect between palladium and gallium oxide via formation of a bi-functional active Pd−O−Ga phase, resulting in a highly active and exceptionally stable catalyst that could markedly suppress the sintering of noble metals under harsh conditions (hydrothermal treatment at 750 °C). Moreover, the presence of a large amount of surface oxygen vacancies and the surface Pd−O−Ga phase could promote methane combustion over the catalysts. It is believed that such a novel dual-metal catalyst is promising in practical applications for methane combustion.
研究领域:
催化化学
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环境科学
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材料科学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·Vol. 52
·期 1
·1327-1334
·
IF 5.6
Yuping Hou,Yusong Du,Xiaofei Wu,Guihua Li,Lin Li,Huan Li,Shuai Cheng,Jingtai Zhao
Highly efficient mechanoluminescent material Gd 3 GaO 6 : Eu 3+ was synthesized by high-temperature solid-phase method. The phosphor can effectively excited by ultraviolet light near 261 nm, along with strong red emission from the phosphor at 612 nm due to the main radiation transition of 5 D 0 - 7 F 2 of Eu 3+ . The results of photoluminescence and mechanoluminescence indicated that the luminescence intensity reaches a maximum when the concentration of Eu 3+ is 0.1. The thermoluminescence spectroscopy results indicated that the mechanoluminescence manifestation of the phosphor was caused by the release of carriers from the trap under mechanical stimulation, thereby revealing the mechanism of mechanoluminescence of Gd 3 GaO 6 : Eu 3+ . The possible applications of wearable devices based on fluorophores in the bending-induced mode are also proposed, showing a wider development prospect for the application of phosphors to wearable devices.
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产品关联
DOI
高影响因子
LANGMUIR
·
2021
·
IF 3.882
Stephan Handschuh-Wang,Tiansheng Gan,Tao Wang,Florian J. Stadler,Xuechang Zhou
Gallium-based alloys have garnered considerable attention in the scientific community, particularly as they are in an atypical liquid state at and near room temperature. Though physical parameters, such as thermal conductivity, electrical conductivity, viscosity, yield stress, and surface tension, of these alloys are broadly known, the surface tension (surface free energy) of the oxide skin remains intangible due to the high yield stress of the oxide skin. In this article, we propose to employ gradually attenuated vibrations to obtain equilibrium shapes, which are analyzed along the lines of the puddle height method. The surface tension of the oxide skin was determined on quartz glass and liquid metal-phobic diamond coating to be around 350–365 mN/m, thus independent of the substrate surface or employed liquid metal (i.e., eutectic Ga–In (EGaIn) and galinstan). The similarity of the surface tension for different alloys was ascribed to the composition of the oxide skin, which predominantly comprises gallium oxides due to thermodynamic constraints. We envision that this method can also be applied to other liquid metal alloys and liquid metal marble systems facilitating modeling, simulation, and optimization processes.
研究领域:
材料科学
·
物理化学
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DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Lei Xiao,Lianwen Deng,Yingxiang Li,Zhenjun Qing,Yecheng Xi,Jiahui Zhu,Sen Peng
TiSnNbTaGa 2 O 12 (TSNTGO) high–entropy dielectric ceramic was successful synthesized using the solid-state reaction method. X–ray diffraction (XRD), Rietveld refinement and transmission electron microscopy (TEM) were used to verify that all samples have rutile structure of P42–mnm space group. The analysis of Raman spectra proved that the ε r exhibited a contrary changing trend as that of Raman shift near 822 cm −1 , and the same similar relationship occurred between Q×f values and full width at half maximum (FWHM). The exploration of complex chemical bonding theory (P–V–L theory) for TSNTGO ceramics suggested that the bond ionicity played a dominant role in ε r , while Q×f and τ f were primarily determined by lattice energy and bond energy, respectively. Notably, the TSNTGO ceramics sintered at 1275 ℃ demonstrated optimal microwave dielectric properties of ε r = 33.62 ± 0.03, Q×f = 51,832 ± 1000 GHz ( f 0 = 6.4 GHz), and τ f = –0.38 ± 0.16 ppm/℃.
研究领域:
材料科学
·
固态物理
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 30
·14930-14938
·
IF 9.931
Y. F. Cui,W. Jiang,S. Liang,L. F. Zhu,Y. W. Yao
A series of In/Ga-based MIL-68s, with batch molar ratios of In(III) to Ga(III) (In/Ga ratio) equaling 5 : 0, 4 : 1, 3 : 2, 1 : 1, 2 : 3, 1 : 4, and 0 : 5, were solvothermally prepared. Calcinating the as-prepared MOFs at 500 °C for 3 h produced a series of mesoporous In/Ga oxides (IGOs) of hexagonal morphology with a characteristic main pore radius of 3 nm to 12 nm, and a specific surface area of up to 60–135 m2 g−1. Studies on the ethanol gas-sensing properties of the as-prepared IGOs revealed that the two IGOs produced from MIL-68 with In/Ga ratios of 3 : 2 and 1 : 1 present high response values of 80–110 towards 300 ppm ethanol and a low detection limit of no more than 2 ppm. However, the response value of In2O3, produced from MIL-68 with an In/Ga ratio of 5 : 0, was 11 towards 300 ppm ethanol. At the same time, the two IGO samples exhibited a high response to ethanol, which was more than 2.6 times higher than response values towards CH3CHO, CH3COCH3, H2, CO, CH4, and NO2, at a concentration of 300 ppm. This gas-sensing performance is suggested to be attributed to their comparatively larger specific surface area, and remarkable oxygen vacancy capabilities.
研究领域:
材料科学
·
化学工程
·
纳米技术
·
传感器
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Yuting Zhong,Yalan Hu,Han Mo,Zhirui Wu,Xin Fu,Liqun Zhou,Hongying Liu,Ling Li,Xiaoguang Liu
A wrinkled rGO modified nanorod gallium oxides (Ga 2 O 3 ) anchored PdPb nanoalloys composite (PdPb@rGO/Ga 2 O 3 ) was prepared using GO/Ga-MOF as the precursor by facile hydrothermal, calcination and reduction approach, and then applied as an electrocatalyst for alcohols electrooxidation. Electrochemical tests show that the fabricated PdPb@rGO/Ga 2 O 3 exhibits superior electrocatalytic activity and high anti-CO poisoning capability for methanol, ethanol and ethylene glycol oxidation reactions (MOR, EOR and EGOR), outperforming Pd@rGO/Ga 2 O 3 and commercial Pd/C. Specifically, the bimetallic electrocatalyst owns the highest forward peak current density of 115.84 mA cm −2 , 146.97 mA cm −2 and 226.59 mA cm −2 , which is 4.69, 5.08 and 8.38 times of Pd/C for MOR, EOR and EGOR, respectively. After 3600 s CA test, the retained current density of PdPb@rGO/Ga 2 O 3 achieves the initial 59.24%, 71.13% and 81.71% towards MOR, EOR and EGOR, respectively. The remarkable performance is attributed to the electronic effects of PdPb nanoalloys, which can improve the electronic structure of Pd d-band, while the surface decoration of Pb/PbO NPs can dramatically adsorb more oxy-species and accelerate the oxidative removal of CO (ads) . Moreover, the oxidation mechanisms of three alcohols and the removal processes of CO (ads) on the Pd surface are analyzed in detail.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 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）