International Journal of Minerals Metallurgy and Materials
·
2020
·Vol. 27
·期 12
·1703-1710
·
IF 1.713
Zhou Jing,Nie Dan-dan,Jin Xian-bo,Xiao Wei
Pyrolysis of the Ta 2 O 5 /melamine mixture in molten chlorides is herein demonstrated as a facile and controllable method to nitridize and functionalize Ta 2 O 5 . The influence of the stoichiometry and composition of Ta 2 O 5 /melamine in molten salts on the nitridation process is rationalized to ensure the controllable preparation of Ta 3 N 5 and Ta 3 N 5 /TaON. The characterization results, including scanning electron microscopy, transmission electron microscopy, elemental mapping, X-ray photoelectron spectroscopy, and photoluminescence spectroscopy, all confirm the existence of the Ta 3 N 5 /TaON heterojunction, in which the TaON nanoparticles are closely anchored to the Ta 3 N 5 nanorods. Benefiting from its composition and structure, the Ta 3 N 5 /TaON composites show enhanced photocatalytic activity for the degradation of methylene blue. The present study highlights that the molten salt method using a solid nitrogen source can be a new technique for rationalizing the design of nitrides and oxynitrides.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
NANOTECHNOLOGY
·
2014
·Vol. 25
·期 21
·215401
·
IF 3.672
Lin Mao,Shenmin Zhu,Jun Ma,Dian Shi,Yixin Chen,Zhixin Chen,Chao Yin,Yao Li,Di Zhang
A H2O2-mediated hydrothermal method was developed for the fabrication of hydrophilic Ta2O5/graphene composite. The composite shows a superior H2 productivity, up to 30 mmol g−1 h−1 when used as a photocatalyst for water splitting, corresponding to an apparent quantum efficiency of 33.8% at 254 nm. This superior performance is due to the hydrophilic nature of the composite and more importantly due to the ultrafine Ta2O5 nanoparticles (about 4.0 ± 1.5 nm) which are covalently bonded with the conductive graphene. The hydrophilic property of the composite is attributed to the use of H2O2 in the hydrothermal process. The ultrafine size of the Ta2O5 particles which are covalently bonded with the graphene sheets is attributed to the use of sonication in the synthesis process. Furthermore, the hydrophilic Ta2O5/Gr composite is durable, which is beneficial to long term photocatalysis. The strategy reported here provides a new approach to designing photocatalysts with superior performance for H2 production.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIOMATERIALS
·
2014
·
IF 8.312
Yushen Jin,Yanyan Li,Xibo Ma,Zhengbao Zha,Liangliang Shi,Jie Tian,Zhifei Dai
A nanotheranostic agent has been readily fabricated by encapsulating tantalum oxide (TaO x ) nanoparticles (NPs) into polypyrrole (PPy) NPs via a facile one-step chemical oxidation polymerization for bimodal imaging guided photothermal ablation of tumor. It was proved that the obtained composite nanoparticles (TaO x @PPy NPs) with an average diameter around 45 nm could operate as an efficient bimodal contrast agent to simultaneously enhance X-ray CT and photoacoustic (PA) imaging greatly in vivo . Systemically administered TaO x @PPy NPs could passively accumulate at the tumor site during the blood circulation, which was proved by both CT and PA imaging. In addition, the in vivo therapeutic examinations showed that TaO x @PPy NPs exhibited significant photothermal cytotoxicity under near infrared laser irradiation. The tumor growth inhibition was evaluated to be 66.5% for intravenously injection and 100% for intratumoral injection, respectively. This versatile agent can be developed as a smart and promising nanoplatform that integrates multiple capabilities for both accurate diagnosing and precise locating of cancerous tissue, as well as effective photoablation of tumor.
研究领域:
医学影像学
·
纳米医学
·
肿瘤学
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DOI
PubMed
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Zhenxiao Tang,Maozhong Yi,Zhe Zhou,Huang Wu,Yuanming Zhou,Ke Peng
A C/C-TaB 2 -SiC composite was successfully prepared by high-solid-loading slurry impregnation combined with polymer infiltration and pyrolysis. The composite had a density of 3.46 g/cm 3 and consisted of pyrolyzed carbon, carbon fibers, TaB 2 particles, and precursor-derived SiC with their mass fractions of 7.8 %, 13.0 %, 58.6 %, and 20.6 %, respectively. The C/C-TaB 2 -SiC composite possessed a flexural strength of 248.2 ± 16.8 MPa and a fracture toughness of 13.7 ± 1.6 MPa·m 1/2 , and demonstrated a non-brittle fracture behavior . After exposure to oxyacetylene flame with a heat flux of 4.18 MW/m 2 for 120 s, the ablation temperature of the sample surface reached a maximum of 2263 °C, and the mass and line ablation rates were 2.24 mg/s and 12.92 µm/s, respectively. The ablation resistance mainly comes from the hindrance of oxygen diffusion by the oxide layer composed of tantalum oxide and a small amount of SiO 2 .
研究领域:
材料科学
·
航空航天工程
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DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2019
·Vol. 91
·期 1
·82-91
·
IF 1.986
An Lin,Han Xin,Li Yaogang,Hou Chengyi,Wang Hongzhi,Zhang Qinghong
Abstract In recent years, tantalum oxynitride (TaON) semiconductor as one of the most efficient photocatalysts has been studied intensively owing to the appropriate potentials for overall solar water splitting. In this work, ZnS/CdS/γ-TaON composite photocatalysts with wide light response were successfully prepared by nitridation of Ta 2 O 5 at 800 °C in a wet NH 3 flowing and subsequently deposition CdS and ZnS quantum dots. The powders were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV–vis diffuse reflection spectroscopy (DRS), N 2 adsorption–desorption isothermals, X-ray photoelectron spectroscopy (XPS), and so on. The photocatalytic property for hydrogen production was also studied. The results indicated that CdS and ZnS quantum dots with a diameter of 3–8 nm were uniformly dispersed on the surface of γ-TaON, which enlarged the spectral response of the ZnS/CdS/γ-TaON photocatalysts. And the optimized H 2 evolution rate of ZnS/CdS/γ-TaON composite (839.6 μmol h −1 g −1 ) is about 14 times higher than that of CdS/γ-TaON in the absence of any noble-metal cocatalyst and 47 times higher than that of Pt loaded γ-TaON sample. The enhanced photocatalytic activity is attributed to the higher separation efficiency of electrons and holes with the heterogeneous junction between ZnS, CdS, and γ-TaON. Besides, the presence of γ-TaON and ZnS also prevent the photocorrosion of CdS. The results provide a new insight for developing the TaON-based nanocomposite photocatalysts with enhanced stability and excellent photocatalytic H 2 production activity.
研究领域:
材料科学
·
光催化技术
·
能源转换与储存
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DOI
高影响因子
Materials Horizons
·
2025
·
IF 10.7
Menglong Gao,Yao Guo,Shiding Zhang,Yinghui Xue,Jianxin Li,Shuaishuai Hu,Haixiang Song,Kaidi Wu,Miaomiao Li,Huihui Zhao,Zhongyuan Zhou,Qing Shen
We study the interface properties of CsPbBr3/Nb2O5 and CsPbBr3/Ta2O5 heterojunctions for structural, electronic, and optical characteristics. First-principles calculations were performed to analyze interfacial binding energy, electronic local function (ELF), charge density difference, and electrostatic potential. Four interface configurations were constructed based on CsPbBr3 (100) and M2O5 (001) terminations, revealing that the PbBr/TaO interface exhibits the highest binding energy (0.0073 eV Å−2), indicating superior stability. Charge transfer calculations demonstrate electron migration from CsPbBr3 to M2O5, forming an internal electric field that promotes charge separation. ELF and charge density difference maps highlight strong covalent interactions at the interfaces, particularly in the PbBr/TaO interface. Experimental characterization via XRD, SEM, TEM and XPS confirms successful heterojunction formation with preserved crystallinity. These findings provide theoretical and experimental insights into optimizing M2O5-based electron transport layers to enhance PSC efficiency and stability.
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PubMed
高影响因子
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