ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Xiaoqing Yue,Jianqun Yang,Weiqi Li,Yuhang Jing,Lei Dong,Yubao Zhang,Xingji Li
Hydrogen (H2) is an environment-friendly clean energy. In recent years, novel hydrogen evolution electrocatalysts have attracted extensive attention in the scientific community. In this work, the conversion of 2H phase tungsten selenide (2H-WSe2) into 1T phase tungsten selenide (1T-WSe2) was induced by 1 MeV electron irradiation to improve its electrocatalytic performance. When the irradiation fluence is 5 × 1014 e/cm2, the minimum initial overpotential of WSe2 is 101 mV lower than the initial overpotential of WSe2 without irradiation. This method has the characteristics for a simple process and mass production. At the same time, the atomic structure of WSe2 was characterized and the 1T properties of WSe2 were confirmed. The experimental results show that 1 MeV electron irradiates WSe2 to produce Se vacancies on the base surface to form 1T-WSe2, which is the main reason for improving its performance. This effective and feasible electron irradiation method provides a new strategy for the controllable acquisition of 1T-WSe2 and a new method for other similar materials to introduce the ideal 1T phase.
研究领域:
材料科学
·
电催化
·
能源转换
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 20
·4954
·
IF 3.1
Wenhui Lou,Yang Tang,Haohong Chen,Yisong Lei,Hui Lin,Ruijin Hong,Zhaoxia Han,Dawei Zhang
Eu 3+ -doped Y 2 O 3 -based luminescent materials can be used as a scintillator for electron or high energy β-ray irradiation, which are essential for applications such as electron microscopy and nuclear batteries. Therefore, it is essential to understand their defect mechanisms and to develop materials with excellent properties. In this paper, Y 2 O 3 -based transparent ceramics with different Eu 3+ doping concentrations were prepared by solid-state reactive vacuum sintering. This series of transparent ceramic samples exhibits strong red emission under electron beam excitation at the keV level. However, color change appears after the high-energy electron irradiation due to the capture of electrons by the traps in the Y 2 O 3 lattice. Optical transmittance, laser-excited luminescence, X-ray photoelectron spectroscopy (XPS), and other analyses indicated that the traps, or the color change, mainly originate from the residual oxygen vacancies, which can be suppressed by high Eu doping. Seen from the cathodoluminescence (CL) spectra, higher doping concentrations of Eu 3+ showed stronger resistance to electron irradiation damage, but also resulted in lower emissions due to concentration quenching. Therefore, 10% doping of Eu was selected in this work to keep the high emission intensity and strong radiation resistance both. This work helps to enhance the understanding of defect formation mechanisms in the Y 2 O 3 matrix and will be of benefit for the modification of scintillation properties for functional materials systems.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Yuxin Xiao,Aihu Feng,Junge Chen,Qianying Cao,Le Mi,Yang Yu,Yanfeng Gao,Yun Yu
In this study, the viability of MgGa 2 O 4 as a pigment for thermal control coatings is discussed. Notably, the MgGa 2 O 4 based coating exhibited excellent initial optical properties and irradiation stability. After irradiation with 40 keV proton at a dose of 1.4 × 10 14 P/cm 2 , the optical performance of the coating remained essentially unchanged, while the solar absorption of the coating is still maintained below 0.10 after irradiation with 40 keV electron at a dose of 1.6 × 10 16 e/cm 2 . Further, the mechanism of the optical changes induced by electron irradiation was elucidated through experimental and computational methods. In MgGa 2 O 4 lattice, two different types of oxygen vacancies and a transition process of them were found. This process was accompanied by the leakage of some oxygen atoms from the lattice, leading to an increased number of color centers and the change in optical properties. Despite the solar absorption raised after electron irradiation , the MgGa 2 O 4 based thermal control coating showed minimal change and low end-of-irradiation-life values, which suggests that they have excellent stability and promising applications.
研究领域:
材料科学
·
航天工程
·
光学
✓ 已验证
产品关联
DOI
高影响因子
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
·
2022
·
IF 1.279
Tao Li,Hongjun Kang,Songtao Lu,Wei Qin,Xiaohong Wu
As space exploration moves further and further into deep space, it is a big challenge to develop antistatic inorganic thermal control coating with lightweight and strong adhesion to substrates. Herein, this work reported an inorganic antistatic AZO/Al 2 O 3 -ZnO-Y 2 O 3 composite coating fabricated by PEO combined with ALD methods. The results show that when the Zn/Al ratio of deposited AZO film is 24:1, its overall performance is the optimal, and the emissivity, absorptivity and resistivity are 0.892, 0.409 and 1.15 × 10 –3 Ω·cm, respectively, which can meet thermal control application requirements of spacecraft. Furthermore, the AZO/Al 2 O 3 -ZnO-Y 2 O 3 composite coating shows a good electron-resistance irradiation performance, which is because AZO conductive film is easy to generate free carriers, speed up some electron transport and make electrons better disperse and conduct, thus reducing the penetration depth of electron irradiation. This work provides a material basis for thermal control system of spacecraft with long life and high reliability.
研究领域:
材料科学
·
航天工程
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2018
·Vol. 10
·期 47
·22335-22347
·
IF 7.233
Vitaly Neshchimenko,Chundong Li,Mikhail Mikhailov,Jinpeng Lv
Zinc oxide has multifunctional physical properties depending on its microstructure and morphology. Herein, we reported the in situ investigations of the radiation stability of ZnO particles with hollow, ball, star and flower shapes under electron and proton irradiation. 100 keV protons with a fluence of 5 × 1015 cm−2 and 50 keV electrons with fluence ranging from 0.5 to 7 × 1016 cm−2 are employed to investigate the radiation stability of nanostructured ZnO particles. In situ reflectance, X-ray photoelectron spectra and photoluminescence were characterized in the irradiation environment to avoid the effects of the atmospheric environment on radiation induced defects. The experimental results reveal that, compared to the other shapes, the hollow structure with the best radiation stability due to the hollow structure facilitates the decrease of the accumulation of radiation defects. This study clearly demonstrates the promise of ZnO hollow particles as a plasmonic nanostructure for achieving high radiation stability, and they could be easily employed to serve as the radiation stability pigment for coatings.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of the American Chemical Society
·
2025
·
IF 15.6
Zeyu Wang,Xiangchen Hu,Yue Zhang,Xiaoyan Wu,Hongsheng Shi,Wei Liu,Yi Yu
Garnet-type solid electrolyte cubic Li7La3Zr2O12 (c-LLZO) emerges as a promising candidate for establishing reliable and high-performance lithium-ion batteries. Its extreme sensitivity to electron irradiation poses a significant challenge in atomically resolving its structure using conventional transmission electron microscopy (TEM) techniques. We demonstrate that the combination of low-dose four-dimensional scanning TEM (4D-STEM) with multislice ptychographic retrieval methodology manages to achieve a sub-Angstrom resolution and the direct visualization of lithium atoms within c-LLZO. The distribution of lithium in depth direction is also obtained. This work provides atomic-scale insights into the distribution of light elements within irradiation-sensitive dense crystals, paving the way for investigating the microstructure–property relationship.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2018
·
IF 4.484
Jialun Tang,Sheng Huang,Zhaohan Li,Huaibin Shen,Zhao Lv,Haizheng Zhong
In this work, we reported the morphology evolution (formation of voids & size reduction) of gradient-alloyed CdxZn1–xSeyS1–y@ZnS quantum dots under electron irradiation during transmission electron microscopy observation. By investigating the correlations between shell gradients and morphology evolution, the formation of voids can be explained by the continuous electron irradiation-induced atomic movement under interfacial strain. On the other hand, the size reduction can be attributed to the elastic scattering-enabled sputtering of surface atoms. The as-formed voids of CdxZn1–xSeyS1–y@ZnS quantum dots with CdS-rich cores are much larger than those of ZnSe-rich ones, and the sizes of voids decreased with the increasing of shell thickness. The comparison of the morphology evolution of CdxZn1–xSeyS1–y@ZnS core–shell quantum dots with different composition gradients demonstrated that the size and shape of as-formed voids illustrate the strain characteristics of shell gradient. This provides a guideline to understand the strain effects in gradient-alloyed core–shell quantum dots through transmission electron microscopy measurement. We believe the deep insights into gradient-alloyed CdxZn1–xSeyS1–y@ZnS core–shell quantum dots would push forward their optimization toward commercialized light-emitting technology.
研究领域:
材料科学
·
纳米技术
·
物理学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Xiaoqing Yue,Jianqun Yang,Xigang Zhu,Xuewen Wang,Yuhang Jing,Weiqi Li,Lei Dong,Yubao Zhang,Hao Jiang,Xingji Li
A facile approach for surface defect engineering based on high-energy electron irradiation is proposed here to produce a graphene/polymer composite flexible humidity sensor with high humidity resistance and responsiveness. The responsiveness of the graphene/polymer composite humidity sensor following electron irradiation was ∼22.4-fold greater than the unirradiated humidity sensor. When the relative humidity was 97.3%, the responsiveness of the sensor was 1.2 × 105. In addition, the irradiated humidity sensor maintained an excellent response after 10 water resistance tests. Furthermore, material characterization techniques demonstrated that graphene/polymer composite materials with low crosslinking density could be produced by electron irradiation at the appropriate fluence. Concurrently, the specific surface area of the graphene/polymer composite material was increased, and several oxygen-containing functional groups were generated, providing more active sites for water molecules to enhance the stability and responsiveness of the sensor. Thus, the irradiated graphene/polymer composite humidity sensor has potential applications in human respiratory monitoring and noncontact switching. Moreover, the surface defect engineering of electron irradiation provides a facile strategy for obtaining graphene/polymer composite flexible humidity sensors with high comprehensive properties.
研究领域:
材料科学
·
电气工程
·
纳米技术
·
传感技术
✓ 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）