JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2023
·Vol. 34
·期 6
·1-9
·
IF 2.8
Chen Wei,Sun Hui,Jin Yingrong,Yang Hualin,He Yi,Zhu Xinghua
Cs 3 Bi 2 I 6 Br 3 perovskite is one of the bismuth iodide family compounds. Because it contains no toxic lead, and has high stability in air and humidity, endowing a potential application prospects in photoelectric and radiation detectors. Herein, the Cs 3 Bi 2 I 6 Br 3 single crystal (Φ13 × 65 mm 3 ) with a (001) preferred direction was grown by using the melt method with solvent-synthesized polycrystalline particles, and the thin single wafer with a thickness up to 0.95 mm was obtained. The as-grown single crystal possesses high infrared transmittance of up to 70% in the range from 400 to 4000 cm −1 and an optical band gap of about 2.03 eV estimated from the visible absorption curve. A highly intrinsic resistivity 2.3 × 10 10 Ω·cm and a dielectric constant about 10 were obtained from the electrical performance parameter measurements. The X-ray sensitivity of the X-ray detector is 55.62 µC/Gy air /cm 2 (incident dose rate 0.24 mGy/s), as well as the signal-to-noise ratio, is up to 301. These results indicate Cs 3 Bi 2 I 6 Br 3 single crystals are a potential material for X-ray detection.
研究领域:
材料科学
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光电检测
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 11
·6689-6703
·
IF 4.22
Cao Yanming,Zhang Dongbin,Kong Xianggui,Zhang Fazhi,Lei Xiaodong
Abstract Introducing anion and cation vacancies into Co-based oxides is a promising strategy to promote their catalytic activity. However, the mild and effective methods for synthesizing cobalt oxide and vacancies are rarely proposed. In this work, via an innovative one-step hydrothermal process, we synthesized Co 3 O 4 -based catalyst, which was successively proven rich with oxygen vacancies (V O ) and cobalt vacancies (V Co ). As an electrocatalyst for benzyl alcohol (BA) oxidation, the vacancy-rich Co 3 O 4 on nickel foam (NF) with optimized electronic structure displayed a super high conversion (> 99%) and selectivity (> 99%) for benzoic acid (BAc) with excellent recyclability, representing one of the best Co‐based catalysts. X-ray photoelectron spectroscopy (XPS) and X-ray adsorption near-edge structure (XANES) technologies coupled with density functional theory calculations (DFT) demonstrated the obvious electronic delocalization caused by vacancies not only lowered the adsorption energy of BA and improved the intrinsic activity of catalytic Co sites for faster reaction kinetics, but also narrowed the band gap for better electrical conductivity. This work opens up a new simple synthetic idea to construct the high-performance electrocatalysts by tuning electronic structure. Graphical abstract
研究领域:
材料科学
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电化学
·
催化
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化工
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DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2025
·
IF 8
Liang Jiang,Xiaojiang Chen,Jun Liao,Lielin Wang,Yuxin Zhang,Sha Yang,Qiuyi Wang,Yaoyao Tang,Congcong Ding
Rapid and efficient removal of radioactive iodine from nuclear accidents and effluent waste was significantly essential to protect the living environment and maintain human health. The nano-zero-valent copper modified activated carbon fiber (Cu 0 @ACF) composite was successfully synthesized via an in situ self-reduction method. The structural and chemical compositions of both pristine and iodine-adsorbed samples (ACF and Cu 0 @ACF) were systematically analyzed by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The coexistence of carbon and copper was verified using energy dispersive spectroscopy (EDS). The effects of modifier concentration, contact time, pH value and interfering ions on the removal of I 2 and I − were comprehensively investigated through batch experiments. The adsorption capacity of 4 wt% Cu 0 @ACF for I 2 reached 980 mg/g (C 0 = 1000 mg/L, pH = 2), and for I − was 358 mg/g (C 0 = 400 mg/L, pH = 2), significantly outperforming other reported iodine adsorbents. The kinetic studies revealed that the adsorption processes followed pseudo-second-order kinetics, while isotherm data were best described by the Langmuir model (R 2 > 0.99), indicating monolayer chemisorption. The adsorption mechanism was dominated by chemical reactions where in iodide ions (I − ) interact with the metallic nano‑copper (Cu 0 ) anchored on the ACF surface, resulting in the formation of CuI characterized by polar covalent bonding. In a word, Cu 0 @ACF showed an outstanding potential for radioactive wastewater treatment applications and this work presents a facile strategy for developing high-performance ACF-based adsorbents.
研究领域:
环境科学
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材料科学
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核工程
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化学工程
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表面化学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Shanshan Yu,Jian Wang,Wanshun Yang,Mingyu Hu,Wei Qian,Han Li,David Lee Phillips,Shihe Yang
Organic-inorganic hybrid perovskites have emerged as promising materials for the next-generation X-ray flat panel imagers, but the thorny problems of large dark current and baseline drift have hindered their development. Here we judiciously combine a 1D-CsPbI 3 /3D-FAPbI 3 perovskite and a Schottky junction in the design of a novel perovskite X-ray detector to boost the imaging performance. The n-type 3D-FAPbI 3 forms a high Schottky barrier with the carbon electrode to suppress the dark current and launch electron tunneling under X-ray on, while the 1D-CsPbI 3 layer further minimizes dark current and baseline drift by inhibiting hole injection and ion migration. Consequently achieved are an enhanced sensitivity of 19,264 μC Gy air −1 cm −2 , a low LoD of 38.4 nGy air s −1 , a radically lowered baseline drift of 4.21 × 10 −6 nA cm −1 V −1 s −1 and a drastic dark current reduction by two orders of magnitude at 150 V mm −1 . The perovskite flat-panel detector (PeFPD) achieves a high resolution of 0.54 lp pix −1 (4.29 lp mm −1 ) over a large area of 3.2 × 3.2 cm 2 , capable of capturing intricate internal structures of both biological specimens and industrial products. This work highlights the design of junctions in advancing the perovskite-based direct conversion flat-panel X-ray imaging systems.
研究领域:
材料科学
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光电子学
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X射线成像技术
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半导体器件
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL GEOLOGY
·
2025
·
IF 3.6
Changjin Liang,Honghai Wu,Yaowei Li,Yufeng Guan
Ferrihydrite (Fh) can usually transform into phases with higher crystallinities. This may greatly alter Fh adsorption capacity for chromium ions, thereby affecting their immobilizations and fates. Foreign elements [e.g., lanthanum (La)] as impurities can become incorporated into Fh. Herein, the effect of La-substitution into Fh and the influence of the presence of Cr(VI) on Fh phase transformation and fate of Cr(VI) were investigated. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Electro-chemical impedance spectroscopy (EIS), and X-ray photoelectron spectroscopy (XPS) and other test methods were employed to probe phase changes after the Fe(II)-induced La-substituted Fh (La-Fh) transformations. At pH 5.5, no neoformed phase was observed until 7 d for La-Fh or pure Fh at 1 mM Fe(II) aq, but all La-Fh systems underwent transformations at 5 mM Fe(II)aq. A low pH and Fe(II)aq level favored lepidocrocite (Lp) to form, whereas goethite (Gt) was the predominant phase rather than Lp as pH increased to 7.2 with higher level Fe(II)aq. However, the La-substitution inhibits the La-Fh transformation rate and path. This made 5 % La-Fh transformed to Lp after 30 d at pH 7.2 and 1 mM Fe(II)aq. The La-release was present to some extent during the transformation process. Either the inhibition to La-Fh transformation or the La-slow release favors the retention of early-adsorbed Cr(VI) on iron-mineral surface. The added Cr(VI) might promote the La-Fh transformation even under a lower-level Fe(II), primarily attributed to the rapid reduction of Cr(VI) to Cr(III) by Fe(II), which produced more liable Fe(III) in addition to the Cr(III) that can improve the mineral conductivity, thereby enhancing the La-Fh transformation. Mechanisms responsible for the Fe(II)-induced La-Fh transformation companying the La slow-release are proposed to provide insights into the reduction and immobilization of Cr(VI) under anaerobic conditions, thus demonstrating that La-Fh is a promising material for application in Cr-contaminated site remediation.
研究领域:
环境化学
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地球化学
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土壤科学
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材料科学
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环境修复
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产品关联
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2020
·Vol. 22
·期 23
·13108-13117
·
IF 3.43
Ying-Ying Jiang,Zhi-Qiang Wang,Jia-Tang Chen,Jun Li,Ying-Jie Zhu,Li-Jia Liu,Xiao-Xuan Guo,Yong-Feng Hu,Shi-Sheng He,Jin Wu,Feng Chen,Tsun-Kong Sham
Adenosine triphosphate (ATP) biomolecules play critial roles in the biomineralization process during the formation of amorphous calcium phosphate composites (ACPC), and ACPC is an important drug carrier due to its significant advantages of biocompatibility and biodegradability. Hence, studying the behavior of ACPC nanodrug carriers is crucial to investigate the structural regulation of biomimetic minerals and calcium phosphate (CaP)-based drug delivery systems. However, it is difficult to probe these interactions using traditional characterization methods. In this paper, XANES analysis together with STXM successfully provided a method to reveal the interaction of ATP and drug molecules with individual mesoporous ACPC. We found that the adenosine and phosphate groups of ATP biomolecules coordinated with Ca2+ and played critical roles in the formation of ACPC; drug molecules with the –COOH groups were linked to Ca2+via carboxylic acid groups primarily by electrostatic interactions, and the N-containing ring structures within the drug molecules also coordinated with Ca2+.
研究领域:
材料科学
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生物医学工程
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药剂学
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产品关联
DOI
PubMed
高影响因子
CATALYSIS TODAY
·
2018
·
IF 4.667
Lingcong Li,Xiaojun Liu,Hong He,Ningqiang Zhang,Ziwen Liu,Guizhen Zhang
The MgO-doped hexagonal boron nitride (MgO-h-BN) nanomaterials were designed as a support for Palladium (Pd) catalysts for CO oxidation reaction. The catalytic properties of Pd/MgO(5)-h-BN catalyst was investigated and compared with Pd/h-BN catalyst. Transmission electron microscopy (TEM) results suggested that the PdO nanoparticles with small grain sizes (ca. 8 nm) were effectively dispersed on the surface of MgO, and the MgO were deposited on the h-BN nanosheets in the Pd/MgO(5)-h-BN catalyst. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analyses revealed that a small amount of Mg 2+ embedded into the B vacancies of h-BN nanosheets in the Pd/MgO(5)-h-BN catalyst. More significantly, a large amount of adsorbed oxygen appeared near the B vacancies of Pd/MgO(5)-h-BN catalyst. The experiments outcomes of diffuse reflectance fourier transform spectra analysis of CO (CO-DRIFT) indicated that the carbonate/formate species were easily decomposed to CO 2 on the Pd/MgO(5)-h-BN catalyst than Pd/h-BN catalyst, which might be a reason why the Pd/MgO(5)-h-BN catalyst had high CO oxidation activity. According to above analyses, we provide a new insight for the MgO-h-BN nanomaterials for Pd catalysts for application in CO oxidation reaction.
研究领域:
催化
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材料科学
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化学
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纳米技术
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Shuohai Fang,Tonghan Yang,Wei He,Wenchao Yang,Nannan Wang,Shengshou Ma,Kaimin Shih,Changzhong Liao
High-entropy oxides have gained more attention in recent years due to their excellent performance. In this work, five new Ce-free high entropy fluorite oxides ((Zr 0.2 Ti 0.2 Y 0.2 Nd 0.2 Sc 0.2 )O 2-δ , (Zr 0.2 Ti 0.2 Y 0.2 La 0.2 Sc 0.2 )O 2-δ , (Zr 0.2 Ti 0.2 La 0.2 Nd 0.2 Sc 0.2 )O 2-δ , (Zr 0.2 Ti 0.2 Y 0.2 Nd 0.2 La 0.2 )O 2-δ and (Zr 0.2 Ti 0.2 Dy 0.2 Nd 0.2 La 0.2 )O 2-δ ) were successfully synthesized by solution combustion synthesis with glycine as fuel. Their formation, oxygen vacancy, and long-term thermal stability were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS) techniques. XRD results show that single fluorite phase was observed in (Zr 0.2 Ti 0.2 Y 0.2 La 0.2 Sc 0.2 )O 2-δ , (Zr 0.2 Ti 0.2 Y 0.2 Nd 0.2 La 0.2 )O 2-δ and (Zr 0.2 Ti 0.2 Dy 0.2 Nd 0.2 La 0.2 )O 2-δ samples when sintering at 300, 600 and 900 °C, respectively, but (Zr 0.2 Ti 0.2 Y 0.2 Nd 0.2 Sc 0.2 )O 2-δ sample with single-phase fluorite structure can only obtain by sintering at 900 °C and 1200 °C. For (Zr 0.2 Ti 0.2 La 0.2 Nd 0.2 Sc 0.2 )O 2-δ sample, single fluorite phase can be obtained at 300 °C using calculated fuel and at 900 °C with using excess fuel. In addition, all the samples may have lower crystallinity due to excess glycine. XPS results indicate that factors of sintering temperature, fuel ratio and cationic radii strongly affect the generation of oxygen vacancy, especially for the sintering temperature. Morphology of the high entropy fluorite oxides presents in sponge-like microstructure. Superior long-term stability at high temperature was found in samples (Zr 0.2 Ti 0.2 Y 0.2 Nd 0.2 Sc 0.2 )O 2-δ and (Zr 0.2 Ti 0.2 Y 0.2 Nd 0.2 La 0.2 )O 2-δ . The findings in this work may have great potential applications in oxygen-deficient catalyst and high temperature catalyst.
研究领域:
材料科学
·
陶瓷
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催化
·
固体化学
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产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·
IF 19
Haojun Shi,Lingli Luo,Congcong Li,Yu Li,Tingting Zhang,Zhongliang Liu,Jialin Cui,Li Gu,Ling Zhang,Yanjie Hu,Huihui Li,Chunzhong Li
Copper oxide nanomaterials have been suggested to be efficient for highly selective multi-carbon (C 2+ ) production in CO 2 reduction reaction (CO 2 RR), due to the introduction of surface Cu + species from oxide catalysts. However, the Cu + species on the catalyst surface are prone to being reduced to Cu 0 under reductive conditions during CO 2 RR. Here, a network-structured catalyst is developed consisting of ultrafine Cu 2 O/CuO nanoparticles that harbor an abundance of pores. This catalyst is synthesized via flame spray pyrolysis (FSP) method and engineered to confine carbon intermediates, which subsequently cover the local catalyst surface and stabilize Cu + species. As a result, a C 2+ products Faradaic efficiency (FE) of approximately 80.0% at a partial current density of 320.0 mA cm −2 is achieved, and a large C 2+ to C 1 ratio of ≈9.7. In situ XRD and XPS spectra are employed to reveal the indeed presence of Cu + species on the catalyst surface during the CO 2 RR process, which extensively improves the adsorption of * CO intermediates and thus the C─C coupling reaction to form C 2+ products.
研究领域:
催化
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材料科学
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电化学
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可持续能源
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产品关联
DOI
高影响因子
Advanced Photonics Research
·
2022
·Vol. 3
·期 12
·2200197
·
IF 0
Heng Guo,Qingxian Zhao,Peng Ran,Jinping Chen,Yizhi Zhu,Qingsong Jiang,Yuling Tang,Zhenhua Zhang,Lei Song,Chunxiang Xu,Shouhua Luo,Zengliang Shi
Scintillator is a critical component to detect high-energy particles or rays, which is widely used in deep space exploration, security inspection, and nondestructive testing and medical diagnosis, such as X-ray imaging and computed tomography (CT). However, the wider application of traditional inorganic and organic scintillators is limited by the complex operation process or poor adaptability to changeable environment, and there remains a demand to develop green and stable scintillators with high sensitivity and low detection limit. Herein, the one-step preparation of lead-free perovskite Cs 3 Cu 2 I 5 scintillator film for high-definition X-ray imaging by conventional chemical vapor deposition method is reported. Cs 3 Cu 2 I 5 demonstrates good stability and bright-blue emission at 445 nm and superhigh photoluminescence quantum yield (85.14%). Importantly, upon X-ray irradiation, the Cs 3 Cu 2 I 5 perovskite film exhibits light yield (≈39 251 photons MeV −1 ) as high as two times of the commercially available Ce:LuAG single-crystal scintillator (≈22 000 photons MeV −1 ). Furthermore, the practical demonstration for a bamboo stick and insect specimens illustrates sensitive scintillation response to X-ray signals with superior linearity and high-quality images in X-ray photography and CT. Overall, Cs 3 Cu 2 I 5 film provides nontoxicity, high radioluminescence intensity, and good stability, it can be regarded as a competitive material for X-ray imaging.
研究领域:
材料科学
·
医学影像
·
辐射探测
✓ 已验证
DOI
Journal of Materials Chemistry C
·
2024
·
IF 5.7
Junnan Wang,Zeyu Wang,Nikolai V. Gaponenko,Jindou Shi,Zheyuan Da,Chen Zhang,Yongqiang Ji,Qing Yao,Youlong Xu,Minqiang Wang
X-ray imaging technology has been integral to numerous aspects of people's lives since its inception. With the growing demand for advanced imaging technologies, lead-free metal halide perovskites have received significant attention due to their non-toxicity, stability, and excellent optical properties. This paper investigates the scintillation behaviour of a Te doped Cs2SnCl6 scintillator composite film (CF) prepared through an innovative in situ growth strategy. This approach achieves the direct growth of Cs2SnCl6:Te micro-crystals within polymethyl methacrylate (PMMA), mitigating the issues of optical property degradation and inhomogeneous distribution that are inevitable in a conventional two-step mixing method. By controllable optimization of the doping ratio of Te, the Cs2SnCl6:Te/PMMA CFs exhibited exceptional scintillation properties under X-ray irradiation, with the detection limit reaching up to 112 nGyairs−1. In X-ray imaging applications, the Cs2SnCl6:Te 15%/PMMA CF demonstrated advanced sensitivity, producing high-resolution structural images of the target object. This advancement highlights the promising potential of lead-free metal halide perovskites in the development and application of X-ray imaging technology.
研究领域:
材料科学
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医学影像
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Wenqing Zhang,Hu Wang,Zhilong Chen,Pengxiang Wang,Xin Liu,Hao Dong,Jiaoling Zhao,Yun Cui,Yuchuan Shao
High-energy radiation detectors with a good imaging resolution, fast response, and high sensitivity are desired to operate at a high electric field. However, strong ion migration triggered by electrochemical reactions at the interface between a high-potential electrode and an organic–inorganic hybrid perovskite limits the stability of radiation detectors under a high electric field. Herein, we demonstrate that such ion migration could be effectively suppressed in devices with a Ti cathode, even at a high electric field of 50 V mm–1, through time-of-flight secondary-ion mass spectrometry. X-ray photoelectron spectroscopy illustrates that Ti–N bonds formed at the interface of MAPbBr3 perovskite single crystals/Ti electrode effectively inhibit the electrochemical reaction in organic–inorganic hybrid perovskite devices and ultimately improve the operating stability under a high electric field. The device with a Ti electrode reaches a high sensitivity of 96 ± 1 mC Gyair–1 cm–2 and a low detection limit of 2.8 ± 0.3 nGy s–1 under hard X-ray energy.
研究领域:
材料科学
·
辐射探测技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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