PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2017
·Vol. 19
·期 36
·24513-24521
·
IF 4.123
Zheng Gong,Yuxue Liu,Jian Yang,Duanting Yan,Hancheng Zhu,Chunguang Liu,Changshan Xu,Hong Zhang
Spinel-phase Zn2Ga2.98−xGe0.75O8:Cr0.020,Prx (ZGGO:Cr3+,Pr3+) near infrared (NIR) persistent luminescence nanoparticles (PLNPs) with different amounts of Pr3+ dopant were prepared by a hydrothermal method in combination with a subsequent annealing in a vacuum. For these nanoparticles, the averaged particle size decreases from 64 to 37 nm with increasing Pr3+ doping concentration from 0 to 0.025 and Cr3+ and Pr3+ ions are uniformly doped into the interior and surface of a single nanoparticle. It can be found that Pr3+ doping leads to the appearance of more anti-site pairs () around distorted octahedral Cr3+ ions and enhanced NIR emissions around 697 nm, which originate from the 2E(2G) → 4A2(4F) and 4T2(4F) → 4A2(4F) transitions of the interior and surface Cr3+ ions in the nanoparticles. In particular, for the interior Cr3+ ions in the Pr3+ doped nanoparticles, the enhanced NIR luminescence can be attributed to the suppressed energy transfer of the excited electrons from the 4T2(4F) level to the trap level related to anti-site pairs () around the distorted octahedral Cr3+ ions. Our results suggest that Pr3+ doped ZGGO:Cr3+ PLNPs have potential applications for bio-imaging.
研究领域:
材料科学
·
生物医学工程
·
光学
✓ 已验证
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·Vol. 34
·期 48
·2408754
·
IF 18.5
Jian Dai,Zhenhao Fan,Yangke Long,Wenfeng Yue,Fu Huang,Yitao Jiao,Yuqun Deng,Yunfei Chang,Dawei Wang
Piezocatalysis is capable of harnessing mechanical energy for environmental remediation, which is regarded as a green and promising technology to be exploited. Piezoceramics are struggling to be used as highly efficient piezocatalysts due to their grain size reaching tens of micrometers usually. Herein, a feasible and straightforward method is proposed to turn piezoceramic powders into highly efficient piezocatalysts by integrating size optimization and oxygen vacancy modulation. This strategy is validated by treating lead-free Sr 0.5 Ba 0.5 Nb 2 O 6 (SBN) piezoceramic powders with high-energy ball-milling (hBM). The rate constant k value of 46.95 × 10 −3 min −1 for rhodamine B (RhB) piezocatalytic degradation of SBN-hBM-12h is almost 18 times higher than that of pristine SBN. Besides, the SBN-hBM-12 h catalyst performed superior antibacterial properties against Escherichia coli. The enhanced piezocatalytic efficiency is attributed to the introduced abundant oxygen vacancies absorbing and activating O 2 into reactive oxygen species. Well-modulated oxygen vacancy concentration can effectively accelerate the generation and separation of free carriers. However, the excess oxygen vacancies in SBN render the weakened piezoresponse thus suppressing the piezocatalytic activity. This study elucidates the critical role of oxygen vacancies in piezocatalysis and provides insights into the development of efficient piezocatalysts.
研究领域:
材料科学
·
环境修复
·
催化
·
纳米技术
·
能量收集
✓ 已验证
DOI
高影响因子
Small
·
2024
·
IF 13
Chaochao Wei,Chen Liu,Yujie Xiao,Yadong Li,Ziling Jiang,Xinmiao Liang,Kecheng Cao,Shijie Cheng,Yining Huang,Chuang Yu
All-solid-state fluoride ion batteries (ASSFIBs) show remarkable potential as energy storage devices due to their low cost, superior safety, and high energy density. However, the poor ionic conductivity of F − conductor, large volume expansion, and the lack of a suitable anode inhibit their development. In this work, PbSnF 4 solid electrolytes in different phases ( β - and γ -PbSnF 4 ) are successfully synthesized and characterized. The ASSFIBs composed of β -PbSnF 4 electrolytes, a BiF 3 cathode, and micrometer/nanometer size ( µ -/ n -) Sn anodes, exhibit substantial capacities. Compared to the μ -Sn anode, the n -Sn anode with nanostructure exhibits superior battery performance in the BiF 3 / β -PbSnF 4 /Sn battery. The optimized battery delivers a high initial discharge capacity of 181.3 mAh g −1 at 8 mA g −1 and can be reversibly cycled at 40 mA g −1 with a high discharge capacity of over 100.0 mAh g −1 after 120 cycles at room temperature. Additionally, it displays high discharge capacities over 90.0 mAh g −1 with excellent cyclability over 100 cycles under -20 °C. Detailed characterization has confirmed that reducing Sn particle size and boosting external pressure are crucial for achieving good defluorination/fluorination behaviors in the Sn anode. These findings pave the way to designing ASSFIBs with high capacities and superior cyclability under different operating temperatures.
研究领域:
材料科学
·
电化学
·
能量存储
✓ 已验证
DOI
高影响因子
Nanomedicine-Nanotechnology Biology and Medicine
·
2022
·
IF 6.458
Zhang Ye,Lun Gao,Jiayang Cai,Yixuan Wang,Yong Li,Shiao Tong,Tengfeng Yan,Qian Sun,Yangzhi Qi,Yang Xu,Hongxiang Jiang,Si Zhang,Linyao Zhao,Shenqi Zhang,Qianxue Chen
Glioblastoma multiforme (GBM) is the intracranial malignancy with the highest rates of morbidity and mortality. Chemotherapy is often ineffective against GBM due to the presence of the blood–brain barrier (BBB); however, the application of nanotechnology is expected to overcome this limitation. Poly(lactic-co-glycolic acid) (PLGA) is a degradable and nontoxic functional polymer with good biocompatibility that is widely used in the pharmaceutical industry. Previous studies have shown that the ability of PLGA nanoparticles (NPs) to penetrate the BBB is largely determined by their size; however, determination of the optimal PLGA NP size requires further research. Here, we report a tandutinib-based prodrug (proTan), which responds to the GBM microenvironment , that was combined with NPs to overcome the BBB. AMD3100-PLGA NPs loaded with proTan inhibited tumor growth and effectively prolonged the survival of tumor-bearing mice.
研究领域:
药学
·
纳米技术
·
肿瘤学
·
神经科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）