Science China-Physics Mechanics & Astronomy
·
2018
·Vol. 61
·期 9
·1-4
·
IF 2.754
Zhang Yue,Liu Wenhao,Si Jin,Zhu Xiyu,He Chengping,Zhao Haonan,Wen Hai-Hu
Superconductivity is observed in a new nontoxic cuprate system Ga-Ba-Ca-Cu-O, with T c = 82 K for GaBa 2 Ca 5 Cu 6 O 14 + δ ( 5 (Ga-1256) and T c = 116 K probably for GaBa 2 Ca 3 Cu 4 O 10+δ (Ga-1234) or GaBa 2 Ca 2 Cu 3 O 8+δ (Ga-1223), respectively. All compounds are fabricated by solid state reaction method under high pressure and high temperature. Samples are characterized by resistivity, magnetization and X-ray diffraction (XRD) measurements. The temperature dependence of magnetization measured in both zero-field-cooled and field-cooled processes on one sample (S1) shows two superconducting transitions at about 82 K and 113 K. The estimated shielding fraction for the phase with T c of 82 K is about 67%, while the fraction for another phase with T c of 113 K is quite small. The XRD Rietveld refinement for S1 indicates two main phases existing in the sample, Ga-1256 with fraction of about 58% and non-superconducting Ca 0.85 CuO 2 with fraction of about 42% respectively. Thus, we can conclude the superconducting phase with transition temperature of 82 K is due to Ga-1256. The resistivity measurement also confirms the superconductivity for S1, and the resistivity reaches zero at about 82 K. The temperature dependence of magnetization for another sample (S2) shows much higher superconducting shielding fraction for the phase with T c of 116 K, which may be a promising prospective for the synthesis of Ga-1234 or Ga-1223 phase.
研究领域:
凝聚态物理
·
超导物理
·
材料科学
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DOI
高影响因子
CRYSTAL GROWTH & DESIGN
·
2021
·
IF 4.076
Lei Wang,Xudong Liu,Xiaoguo Bi,Zhixin Ma,Jinsheng Li,Xudong Sun
(Ln + Nb) co-doped TiO2 polycrystalline ceramics possess remarkable dielectric behaviors, but their origin is still not fully understood. Compared to ceramic materials, a single crystal could keep most of the original material’s properties and eliminate interference due to grain boundaries and pores, thereby useful for exploring the origin of the material’s properties. Here, Ga3+ with a radius close to that of the Ti4+ ion was selected as an acceptor ion to study the properties. To this end, rutile single crystals and (Nb + Ga) co-doped rutile single crystals were prepared by the Verneuil method. The permittivity of the doped single crystal at frequencies from 20 Hz to 2 MHz was found to be greater than 15,000, and the dielectric loss was kept below 0.08. The latter value was much smaller than the reported values of rutile single crystal samples. Electrochemical impedance spectroscopy and X-ray photoelectron spectroscopy indicated significantly enhanced dielectric properties, mainly attributed to the highly localized electron-pinned defect dipoles rather than the surface barrier layer capacitor effect. The electrons tightly bounded by the local electric dipole defect clusters can only range over a very small distance, which made the doped crystal have a large dielectric constant over a wide frequency range and maintain a low dielectric loss. In sum, the use of single crystals as a research object greatly provided insights into the origin and optimization of giant dielectric properties of TiO2-based materials.
研究领域:
材料科学
·
介电与电磁材料
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固态物理
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晶体生长
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2017
·Vol. 46
·期 7
·4497-4502
·
IF 1.579
Huang Hang,Hu Hailong,Zhu Jingguang,Guo Tailiang
Inkjet-printed In-Ga-Zn oxide (IGZO) thin-film transistors (TFTs) have been fabricated at low temperature using laser spike annealing (LSA) treatment. Coffee-ring effects during the printing process were eliminated to form uniform IGZO films by simply increasing the concentration of solute in the ink. The impact of LSA on the TFT performance was studied. The field-effect mobility, threshold voltage, and on/off current ratio were greatly influenced by the LSA treatment. With laser scanning at 1 mm/s for 40 times, the 30-nm-thick IGZO TFT baked at 200°C showed mobility of 1.5 cm 2 /V s, threshold voltage of −8.5 V, and on/off current ratio >10 6 . Our findings demonstrate the feasibility of rapid LSA treatment of low-temperature inkjet-printed oxide semiconductor transistors, being comparable to those obtained by conventional high-temperature annealing.
研究领域:
材料科学
·
电子器件
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纳米技术
·
应用物理学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.6
Dong Liang,Xi Jiang,Yingxuan Guo,Yong Wang,Guidong Ju,Yafeng Chen,Quan Wang,Junfeng Liu
Alcohol electrooxidation is an important anodic reaction in alkaline electrochemical energy-conversion systems, yet its performance is often limited by sluggish reaction kinetics and catalyst deactivation associated with strongly adsorbed intermediates. Herein, Ga was introduced into the Pd 2 Sn intermetallic to regulate its surface reaction energetics. A series of composition-controlled ternary Pd 2 (Sn 1-x Ga x ) intermetallic nanoparticles were synthesized through a ligand-regulated colloidal strategy. Systematic compositional optimization identified Pd 2 (Sn 0.87 Ga 0.13 ) as the optimal catalyst, which exhibited enhanced catalytic activity, continuous operational stability, and electrochemical regenerability toward glycerol, methanol, and ethylene glycol oxidation in alkaline media. For glycerol oxidation, Pd 2 (Sn 0.87 Ga 0.13 ) delivered a mass activity of 3.21 A mg Pd −1 and a specific activity of 16.31 mA cm −2 , while quantitative product analysis identified glyceric acid as the predominant liquid product. Density functional theory calculations suggest that Ga incorporation modifies the surface reaction energetics by strengthening hydroxyl adsorption and weakening glyceric acid binding, thereby facilitating intermediate conversion and product desorption. This work suggest that precise Ga engineering of Pd 2 Sn intermetallics can effectively tune surface reaction energetics and provide a viable strategy for improving the catalytic performance and resistance to deactivation of alkaline alcohol oxidation electrocatalysts. Download: Download high-res image (441KB) Download: Download full-size image
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高影响因子
Advanced Optical Materials
·
2024
·Vol. 12
·期 23
·2400762
·
IF 8
Wentao Niu,Xiulin Xie,Zhong Chen,Ruixin Sun,Yu Li,Shuaibing Wang,Yu Zhang,Chunhe Yang,Aiwei Tang
Recently, I-III-VI type quantum dots (QDs) have attracted considerable attention in display technology due to their large-scale tunable emission and environmentally friendly characteristics. However, within this family, narrow-bandwidth Cu-based QDs have rarely been reported. Herein, the synthesis of narrow-bandwidth blue-emitting Cu-Ga-S (CGS)-based QDs is reported by a hot-injection method for the first time, boasting a narrow full width at half-maximum (FWHM) of 29 nm, closely approaching that of traditional Cd-based QDs. Through precisely controlling the temperature of nucleation stage, CGS-based QDs showcase a representative blue emission at 475 nm, featuring the narrowest FWHM and a photoluminescence quantum yield (PLQY) of 32%. Besides, the femtosecond transient fluorescence (fs-TA) characterization indicates that the narrow-bandwidth luminescence is attributed to band-to-hole recombination rather than donor-acceptor pair (DAP) recombination. The work opens a new avenue for narrow-bandwidth I-III-VI QDs, offering increased potential for applications in blue-light-emitting devices.
研究领域:
材料科学
·
光学
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产品关联
DOI
高影响因子
Nanoscale
·
2024
·Vol. 16
·期 28
·13654-13662
·
IF 5.8
Naiwei Wei,Hong Zhu,Danni Yan,Shuai Yang,Lili Xu,Shengli Zhang,Yuhui Dong,Yousheng Zou,Haibo Zeng
I–III–VI quantum dots (QDs) have gained widespread attention owing to their significant advantages of non-toxicity, large structural tolerance, and efficient photoluminescence potential. However, the disbalance of reactivity between the elements will result in undesired products and compromised optical properties. Reducing the activity of highly reactive group IB elements is the most common approach, but it will reduce the overall reactivity and lead to a wide dispersion of QD sizes. In this study, we propose a method to improve the overall reactivity of the reaction system using the highly active IIIA precursor InI3, which triggers rapid nucleation and promotes the formation of Ag(In,Ga)S2 (AIGS) QDs, resulting in monodisperse particle size distributions and a significantly improved photoluminescence quantum yield (PLQY) (from 12% to 72%). Furthermore, narrow band edge emission is realized by coating a gallium sulfide (GaSx) shell on the basis of obtaining high-quality AIGS QDs. The core/shell QDs exhibit a 90% PLQY with a full width at half maximum (FWHM) of only 31 nm at 530 nm. This study provides a viable design strategy to synthesize monodisperse AIGS QDs with a narrow peak width and efficient luminescence, promoting the application of AIGS QDs in the field of luminescent displays.
研究领域:
材料科学
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纳米技术
·
光学
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产品关联
DOI
PubMed
高影响因子
Materials Today Bio
·
2026
·
IF 11
Saadullah Khattak,Salim Ullah,Muhammad Tufail Yousaf,Jianliang Shen,Xiaoqun Xu,Hong-Tao Xu
Bacterial infection and severe inflammatory responses are major barriers to successful wound healing. Drug delivery systems have shown promise in precision medicine by enhancing the targeting and protection of therapeutic agents. However, their use is limited by challenges such as biocompatibility issues, structurally complex, high manufacturing costs, suboptimal drug loading, unstable release, and premature immune clearance. Although targeted delivery aims to improve efficacy, it may increase the risk of toxicity. Consequently, conventional non-carrier drugs often remain more practical and effective. Emerging vehicle-free systems with multifunctional capabilities show promise for precise targeting, controlled release, reduced toxicity, and simplified manufacturing. Here, we rationally designed and established a vehicle-free perfluoroalkyl material (PFAS)–gallium composites (PFASs@Ga) through introducing gallium (Ga) in PFASs, taking advantage of the collective merits of Ga’s antibacterial and pro-healing properties and PFAS’s well-recognized oxygen absorption, carrying of oxygen, chemical inertness, and tunable physicochemical properties. Extensive characterization showed well-defined morphology, elemental configuration, and distinct profiles of gallium ion release. The PFUnA@Ga composite improves gallium integration, Ga release, and O 2 delivery. This allowed it to demonstrate potent broad-spectrum antibacterial activity against bacteria, including MRSA and E. coli , which are known to be resistant. In a MRSA -infected wound model, PFUnA@Ga enhances wound closure and reduces bacterial load, thereby promoting regeneration and angiogenesis. The downregulation of pro-inflammatory M1 macrophages and the upregulation of anti-inflammatory M2 macrophages and CD31 + endothelial cells, representing immunomodulatory effects that facilitate inflammation resolution and vascularization. Results confirmed the composites’ antibacterial activity and accelerated wound-healing efficacy. This multifunctional composite offers a novel approach for advanced wound management. More specifically, the synergistic approach combines metal–ion mediated bacterial inactivation with sustained oxygenation to support infection control and tissue repair.
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2014
·Vol. 97
·期 11
·3555-3560
·
IF 2.428
Songping Wu,Juanjuan Xue,Yingxian Fan
Spinel Mg(Al 1− x Ga x ) 2 O 4 ( x = 0–1) solid solutions were synthesized via solid-state method. Replacement of Al 3+ by Ga 3+ in MgAl 2 O 4 gave rise to the expansion of the lattice, as well as blueshifts of FT-IR and Raman peaks. The homogeneous solid solutions, high relative densities, large grain sizes, and compact microstructures resulted in excellent microwave dielectric properties for spinel Mg(Al 1− x Ga x ) 2 O 4 ( x = 0.6) ceramics sintered at 1485°C: that is, ε r = 8.87, Q × f = 107 000 GHz (at 14.8 GHz), and τ f = −16 ppm/°C. Spinel-structured Mg(Al 1− x Ga x ) 2 O 4 ( x = 0–1) solid solutions possessed low sintering temperatures, wide temperature regions (~100°C), and small negative τ f values. These outstanding performance make Mg(Al, Ga) 2 O 4 a promising candidate material for millimeter-wave devices.
研究领域:
材料科学
·
陶瓷工程
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产品关联
DOI
高影响因子
MOLECULAR PHARMACEUTICS
·
2023
·
IF 4.9
Haiyan Hong,Zhihao Zha,Ruiyue Zhao,Yang Luo,Wenbin Jin,Linlin Li,Ran Wang,Li Yan,Hui Wang,Karl Ploessl,Jinping Qiao,Lin Zhu,Hank F. Kung
Fibroblast activation protein (FAP) is selectively expressed in tumors and highly important for maintaining the microenvironment in malignant tumors. Radioisotope-labeled FAP inhibitors (FAPIs) were proven to be useful for diagnosis and radionuclide therapy of cancer and are under active clinical investigations. Ga-HBED complex displays a higher in vivo stability constant (log KGaL: 38.5), compared to that of Ga-DOTA (log KGaL: 21.3). Such advantage in stability constant suggests that it may be useful for development of alternative FAPI imaging agents. In this study, previously reported [68Ga]Ga-DOTA-FAPI-02 and -04 were converted to the corresponding [68Ga]Ga-HBED-CC-FAPI-02 and -04 derivatives ([68Ga]Ga-4, [68Ga]Ga-5, [68Ga]Ga-6, and [68Ga]Ga-7). It was found that substituting the DOTA chelating group with HBED-CC led to several unique and desirable tumor-targeting properties: (1) robust, fast, and high yield labeling─readily adaptable to a kit formulation; (2) high stabilities in vitro; (3) excellent FAP binding affinities (IC50 ranging between 4 and 7 nM) and improved cell uptake and retention (in HT1080 (FAP+) cells); and (4) excellent selective in vivo tumor uptake in nude mice bearing U87MG tumor. It appeared that Ga(III) chelation with HBED-CC improved the in vivo kinetics favoring higher tumor uptake and retention compared to the corresponding Ga-DOTA complex. Out of the four tested ligands the new [68Ga]Ga-HBED-CC-FAPI dimer, [68Ga]Ga-6, displayed the best tumor localization properties, and further studies are warranted to demonstrate that it is an alternative FAP imaging agent for cancer patients.
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产品关联
DOI
PubMed
高影响因子
Materials Research Express
·
2022
·Vol. 9
·期 12
·125002
·
IF 2.025
Bochen Yang,Jing Wang,Le Kang,Xiaoping Gao,Ke Zhao
Since the outbreak of the COVID-19 epidemic, a large number of disposable protective masks have been manufactured and used, and the abandonment of masks has caused enormous pollution. In this paper the chitosan (CS), polyvinyl alcohol (PVA), and water were used as raw materials and the nanofiber membranes were prepared by electrostatic spinning. The CS/PVA fiber membranes were crosslinked by glutaraldehyde hydrochloric acid vapour. The fiber morphology, hydrolysis resistance, antibacterial properties, chemical structure, thermal stability and filtration performance of nanofiber membranes were characterized. Results shows that the antibacterial performance of the crosslinked composite nanofibers exceeds 97%, the thermal stability is improved, and the fiber morphology is not destroyed. The hybridized fiber membrane has high filtration performance, excellent antibacterial and hydrolysis resistance, which broadening the PVA fiber membrane application. It is expected to replace traditional protective materials and relieve environmental pressure.
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 13
·7300-7313
·
IF 14.511
Zhao Sun,Junpeng Liu,Rongjun Zhang,Yu Wu,Hongwei Li,Sam Toan,Zhiqiang Sun
Sorption-enhanced steam reforming of methanol (SE-SRM) is a promising approach to creating a high-purity hydrogen supply. However, catalysts suffer from activity deactivation and low CO2 uptake capacity. In this study, we investigate the role of Ga doping of Cu–MgO in SE-SRM by synthesizing a series of MgO embedded xGaCuMg catalytic sorbents via a sol–gel method. The TEM-EDX mapping results indicate that MgO nanoparticles can be successfully embedded in the bulk-phase of the catalytic sorbent with a stabilized microstructure. The results from in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) reveal that the Ga-doped catalytic sorbent is conducive to promoting the conversion of C-containing intermediates in SE-SRM, and absorbing CO2 in the form of bidentate carbonate rather than monodentate carbonate. Experimental studies verify that the best uptake capacity of 18GaCuMg catalytic sorbent (36.25 mg CO2/g MgO) achieves almost complete conversion of methanol (99.70%) with 100% H2 selectivity at 200 °C. Specifically, no CO is formed during the kinetic-control stage of SE-SRM. Density functional theory (DFT) calculations based on the Cu(111)Ga2O3(202)MgO(200) model revealed that the Ga doping can enhance the adsorption energies of methanol and carbon dioxide, promoting methanol activation and increasing CO2 uptake capacity. These findings provide valid strategies for functionalized nanomaterial design, which will substantially promote the SE-SRMR performance with desired catalytic sorbent recyclability.
研究领域:
材料科学
·
催化化学
·
能源工程
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DOI
高影响因子
Physica Status Solidi-Rapid Research Letters
·
2018
·Vol. 12
·期 5
·1800034
·
IF 3.721
Anran Song,Kashif Javaid,Yu Liang,Weihua Wu,Jingjing Yu,Lingyan Liang,Hongliang Zhang,Linfeng Lan,Ting-Chang Chang,Hongtao Cao
Concerning the revolutionary future of electronic devices, high-performance solution-processable semiconductors have earned increasing academic and industrial research interests. In this paper, we synthesize In-Ga-Cd-O semiconductor thin films via a solution method. Transparent amorphous/nanocrystalline oxide thin films with small surface roughness have been grown by controlling the relative ratio of Cd-content. The present thin-film transistor with an optimized Cd-ratio exhibits a saturation field-effect mobility up to 10 cm 2 V −1 s −1 , an on/off current ratio of ≈1.3 × 10 9 , and a threshold voltage shift of ≈2.6 V under −5 V gate bias of 10 000 s, which are superior or comparable to those reported values of solution-processed conventional In-Ga-Zn-O counterparts. Our results indicate that the proposed In-Ga-Cd-O semiconductor would endow a promising transparent amorphous/nanocrystalline active material for electronic devices.
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高影响因子
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