JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2021
·Vol. 97
·期 3
·663-671
·
IF 2.326
Wang Yongqiang,Zhou Jin,Shi Chenfei,Gong Gaoshang,Hu Huiyun,Su Yuling
Previous reports depict that the nonstoichiometric Co/Mn ratio greatly affects the physical properties of Ca 3 CoMnO 6 , but few papers focus on the Co/Mn site doping effect. In order to investigate the influence of the substitution on the magnetization, partial Mn 4+ ions were replaced with Al 3+ ions and polycrystalline Ca 3 CoMn 1- x Al x O 6 ( x = 0, 0.05, 0.1, 0.15, 0.2) samples were prepared. All the samples crystallized into rhombohedral structure without existence of impurities. SEM patterns showed that the mean particle size decreased with the introduction of Al element. Due to the dilution effect of nonmagnetic Al 3+ ions to the spin chains, the competing short-range antiferromagnetic/ferromagnetic order caused by the “order by disorder” phenomenon was suppressed. The high-temperature spin freezing peak disappeared gradually and the doped samples presented a faster dynamic behavior, indicating a more robust long-range antiferromagnetic order. The time-dependent magnetization showed a nonmonotonic relaxation in a field of 5T, implying the possible existence of quantum tunneling of magnetization.
Ca 3 CoMn 1- x Al x O 6 ( x = 0, 0.05, 0.1, 0.15, 0.2) samples were synthesized and all of them crystallized into single-phase rhombohedral structure. Due to the dilution effect of the nonmagnetic Al 3+ ions to the …Co 2+ -Mn 4+ -Co 2+ -Mn 4+ …spin chains, the high-temperature spin freezing peak disappears gradually and a faster dynamic behavior in the doped samples is observed. Our investigation confirms that the substitution of the nonmagnetic Al 3+ ions has a similar effect with the Co/Mn defection. This is to say that the nonmagnetic doping could also suppress the formation of short-range magnetic correlation and help in building a more robust long-range antiferromagnetic order. For the nonmonotonic relaxation of the time-dependent magnetization, it implies the possible existence of quantum tunneling of magnetization. The normalized time-dependent M/M 0 curves for Ca 3 CoMn 1- x Al x O 6 ( x = 0, 0.05, 0.1, 0.15, 0.2) measured at 5 K. (1) The magnetization was measured by cooling the samples down to 5K, a field of 5T was applied and kept for 10 min, switching off the field and the remanent magnetization was recorded. (2) The magnetization was measured by cooling the samples down to 5 K firstly and the magnetic field was switched on, as well as field reaches 5T the magnetization was recorded immediately.
研究领域:
凝聚态物理
·
磁性材料
·
强关联电子系统
·
低温物理
·
自旋链
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 4
·1-10
·
IF 5.3
Li Zhonghao,Wan Zherui,Cui Xiaoxu,Chen Qi,Hua Yue,Yang Guang
Polymer dots (PT-PDs) were obtained through a “synthesis-modification integration” method by using polyethyleneimine (PEI) and tartaric acid (TA) as raw materials. The designed PT-PDs displayed a nanoscale structure with an average size of 1.6 nm, and bright blue fluorescence (FL) emission with a fluorescence quantum yield (QY) of 14.3%. Moreover, the PT-PDs were used as a sensing platform for the sensitive and quantitative detection of tetracyclines (TCs) and Al 3+ via fluorescence quenching and recovery. The LODs for tetracycline hydrochloride (TCH), doxycycline (DOX), and Al 3+ were 94.8 nM, 76.7 nM, and 177.8 nM, respectively. In addition, PT-PDs incorporated with polyacrylamide were used for the recognition of TCs and Al 3+ in a portable manner on the basis of the fluorescence “ON–OFF-ON” strategy, which revealed great application in the field of anti-counterfeiting and encryption. Graphical
研究领域:
分析化学
·
材料科学
·
生物医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 42
·36118-36124
·
IF 3.289
Y. Feng,W. L. Li,D. Xu,W. P. Cao,Y. Yu,W. D. Fei
Recently, we proposed a new approach (Li+–Al3+ ionic pairs doping) to enhance the piezoelectric properties of BaTiO3 ceramic. Here we sequentially prove that Li+ and Al3+ can also enhance the piezoelectric properties of PbZr0.52Ti0.48O3 (PZT) ceramic. The X-ray diffraction results demonstrate the optimized distribution of Li+–Al3+ ionic pairs parallel to the [001] direction in the doped ceramics, as same as the results in BaTiO3-based ceramic. The doped ceramics exhibit constricted hysteresis loops, which is associated with the restoring force of Li+–Al3+ ionic pairs as a result of the Coulomb force between Li+ and Al3+ ions. The results show that the piezoelectric properties and corresponding temperature stability of the doped ceramics were enhanced significantly. The analysis and conclusion indicate that the piezoelectric mechanism coming from ionic pairs applies equally well to the PZT ceramic. Co-doping Li+ and Al3+ into the A-site is a preferable approach for the piezoelectric property enhancement of ABO3 ferroelectric ceramics.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
ChemSusChem
·
2023
·Vol. 16
·期 19
·e202300607
·
IF 8.4
Jinmei Wu,Jianwen Yang,Jiawei Zheng,Mengwen Wang,Shengxian Li,Bin Huang,Yanwei Li,Qing Zhu,Quanqi Chen,Shunhua Xiao,Botian Liu
Graphical Co - doping modification of LiNiO 2 : The replacement of Ni atoms with Al 3+ and Ti 4+ ions respectively can improve the charge/discharge cycling performance of LiNiO 2 cathode materials, and their co-doping can more efficiently suppress the Ni 2+ /Li + cation mixing, irreversible phase transition of H2 and H3. Thus, the electrochemical performances exhibit significant synergistic effects. LiNiO 2 cathode material for lithium-ion batteries has the advantages of high specific capacity, abundant resources, and low cost, but it suffers from difficulties in preparation, structural instability, and serious capacity decay. In this work, highly pure and layered structural LiNi 0.95 Al a Ti 0.05- a O 2 ( a =0, 0.025, 0.05) cathode materials were synthesized by a simply sol-gel method. The cation mixing of Ni 2+ and Li + , structural deterioration, irreversible conversion between H2 and H3 phases and unstable surface and CEI (Cathode-electrolyte interface) film can be effectively suppressed by co-doping with Al 3+ and Ti 4+ . A preferred LiNi 0.95 Al 0.025 Ti 0.025 O 2 sample provides a discharge specific capacity of 223 mAh g −1 at 0.1 C and 148.32 mAh g −1 at 5 C, a capacity retention of 72.7 % after 300 cycles at 1 C and a Li + diffusion coefficient of about 2.0×10 −9 cm 2 s −1 .
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 33
·13705-13712
·
IF 0
Zewen Fu,Tengfei Jiang,Lijing Zhang,Bingkun Liu,Dejun Wang,Lingling Wang,Tengfeng Xie
In this paper, we present the fabrication of Ti-doped α-Fe2O3 and surface treatment with Al3+ for application as a photoanode in photoelectrochemical water splitting. The Ti-doped α-Fe2O3 with Al3+ treatment shows a 100 mV cathodic shift of the onset potential and a notable improvement of the photocurrent density. The samples were characterized by SEM, TEM, HRTEM, XRD, Raman, UV-vis and XPS to obtain the information after surface treatment. Based on electrochemistry and photoelectrochemistry techniques, it appears that surface treatment with Al3+ passivates the surface states and decreases the accumulation of charge at the surface of Ti–Fe2O3. The results show that Ti-doped Fe2O3 with Al3+ surface treatment can be used as an efficient photoanode for photoelectrochemical water splitting.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
·
2024
·
IF 2.5
Xiaogang Yu,Md Mostafezur Rahman,Renpeng Yang,Chengwei Wu,Abdelhakim Bouyahya,Wei Zhang
Magnetic induction hyperthermia with self-regulated temperature is an advanced technology capable of automatically regulating hyperthermia temperature through a magnetic phase transition, which has a promising application prospect. This paper investigated the effects of Al 3+ doping on the magnetic properties and Curie temperature of Zn-Mn ferrite. The specific saturation magnetization and Curie temperatures of Zn 0.5 Mn 0.5 Al x Fe 2-x O 4 (0 ≤ x ≤ 0.6) nanoparticles decrease linearly with increment of Al 3+ content. The magnetic heating experiments exhibit that the synthesized nanoparticles can raise the temperature of agar phantom to above 42 °C and self-regulate the temperature below their Curie temperatures, demonstrating their potential for self-regulated temperature hyperthermia. Additionally, in vitro cell experiments confirm the nanoparticles’ good biocompatibility.
研究领域:
材料科学
·
生物医学工程
·
纳米医学
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2022
·
IF 4.831
Xin Li,Liuxi Zhao,Yuhan Wu,Ao Zhou,Xuanfeng Jiang,Yuan Zhan,Zhengguang Sun
Carbon dots have been widely focused on the field of metal ion detection due to their excellent optical property. Herein, novel orange fluorescent nitrogen and boron co-doped carbon dots (NB-CDs) are obtained by one-pot solvothermal using p-phenylenediamine and boric acid as raw materials. The NB-CDs exhibit excitation-independent emissions and the maximum emission wavelength is 597 nm at 420 nm excitation. The fluorescence can be quenched by Ce 4+ effectively and selectively, and the detection range of Ce 4+ is gained from 0.14 to 180 μM with a detection limit of as low as 0.14 μM. Furthermore, Al 3+ can also recombine with NB-CDs surface functional groups, which shows a detection range from 1.07 to 100 μM and a detection limit of as low as 1.07 μM, accompanied with a blue-shift to 527 nm.
研究领域:
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2021
·Vol. 11
·期 9
·2332
·
IF 5.076
Qiangqiang Feng,Yanyan Liu,Jitong Yan,Wei Feng,Shaozheng Ji,Yongfu Tang
A promising aqueous aluminum ion battery (AIB) was assembled using a novel layered K2Ti8O17anode against an activated carbon coated on a Ti mesh cathode in an AlCl3-based aqueous electrolyte. The intercalation/deintercalation mechanism endowed the layered K2Ti8O17as a promising anode for rechargeable aqueous AIBs. NaAc was introduced into the AlCl3aqueous electrolyte to enhance the cycling stability of the assembled aqueous AIB. The as-designed AIB displayed a high discharge voltage near 1.6 V, and a discharge capacity of up to 189.6 mAh g−1. The assembled AIB lit up a commercial light-emitting diode (LED) lasting more than one hour. Inductively coupled plasma–optical emission spectroscopy (ICP-OES), high-resolution transmission electron microscopy (HRTEM), and X-ray absorption near-edge spectroscopy (XANES) were employed to investigate the intercalation/deintercalation mechanism of Na+/Al3+ions in the aqueous AIB. The results indicated that the layered structure facilitated the intercalation/deintercalation of Na+/Al3+ions, thus providing a high-rate performance of the K2Ti8O17anode. The diffusion-controlled electrochemical characteristics and the reduction of Ti4+species during the discharge process illustrated the intercalation/deintercalation mechanism of the K2Ti8O17anode. This study provides not only insight into the charge–discharge mechanism of the K2Ti8O17anode but also a novel strategy to design rechargeable aqueous AIBs.Keywords:aluminum ion battery;K2Ti8O17anode;discharge–charge mechanism
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2014
·Vol. 2
·期 22
·4406-4414
·
IF 0
S. Wang,F. Lou,C. Yu,Q. Zhou,M. Wang,S. Feng,D. Chen,L. Hu,W. Chen,M. Guzik,G. Boulon
Three series of Yb3+-doped silica glasses containing different amounts of Al2O3 and P2O5 were prepared successfully by using a sol–gel method. Absorption, excitation and fluorescence spectra of Yb2+ ions in these silica glasses as well as X-ray photoelectron spectra (XPS) of Yb4d were recorded and analysed systematically. It is found out that the addition of Al3+ or P5+ ions has great influence on the redox state of ytterbium ions. With increasing Al3+ ion contents in these silica glasses, more trivalent Yb3+ ions are reduced to divalent Yb2+. In contrast, the increase of P5+ ion contents greatly promotes divalent Yb2+ ions to be oxidized to trivalent Yb3+. The possible redox mechanisms have been explored and discussed in detail. The influence of Al3+ and P5+ ion contents on the near-infrared luminescence intensity of Yb3+ ions and cooperative luminescence of Yb3+ ion pairs was also discussed. Both the near-infrared luminescence intensity of Yb3+ ions and cooperative luminescence of Yb3+ ion pairs decrease gradually with increasing Al3+ and P5+ ion contents. The decrease of cooperative luminescence of Yb3+ ion pairs indicates a good dispersion effect of Al3+ and P5+ ions on Yb3+ ions in Yb3+-doped silica glass. The results are useful for optimization of fabrication of the high quality Yb3+-doped silica fiber by the composite design of Yb–Al–P co-doped silica glass.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Jiaojiao Wang,Yanyan Gao,Yuexing Zhang,Dongmei Xu,Zongxin Li,Yifei Su,Fang Wang,Ning Zhang,Daopeng Zhang,Kang Wang,Yuting Chen
A versatile dihydroxylsalicylaldazine-containing fluorene (DHSF) compound was easily prepared through a one-step reaction. DHSF simultaneously exhibited solvent-regulating fluorescent OFF–ON behavior toward Al3+/Cr3+ and a dynamic OFF–ON–OFF fluorescent response toward Fe3+ in different aqueous DMF solutions with multiple absorption–ratiometric signals. These could be mainly attributed to the different binding modes between enol–keto isomers and Fe3+/Al3+/Cr3+, as proved by DFT calculation and IR spectroscopy results. Furthermore, DHSF displayed fluorescent OFF–ON–OFF and absorption–ratiometric dual responses to increasing ClO− amounts. These results, together with the fluorescent ON–OFF changes from the metal displacement of the DHSF–Al3+/Fe3+ system by Cu2+, show that monomolecular DHSF is a versatile chemosensor for sensitively detecting Al3+/Cr3+/Cu2+ and quantitatively analysing Fe3+/ClO− with practical application potential.
研究领域:
化学
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Junji Guo,Xungang Diao,Mei Wang,Zhi-Bin Zhang,Yizhu Xie
Electrochromic devices with unique advantages of electrical/optical bistability are highly desired for energy-saving and information storage applications. Here, we put forward a self-driven Al-ion electrochromic system, which utilizes WOx films, Cu foil, and graphite rod as electrochromic optical modulation and graph display electrodes, coloration potential supplying electrodes, and bleaching potential supplying electrodes, respectively. The inactive Cu electrode can not only realize the effective Al3+ cation intercalation into electrochromic WOx electrodes but also eliminate the problem of metal anode consumption. The electrochromic WOx electrodes cycled in Al3+ aqueous media exhibit a wide potential window (∼1.5 V), high coloration efficiency (36.0 cm2/C), and super-long-term cycle stability (>2000 cycles). The dynamic optical modulation and static graph display function can be achieved independently only by switching the electrode connection mode, thus bringing more features to this electrochromic system. For a large-area electrochromic system (10 × 10 cm2), the absolute transmittance value in its color-neutral state can reach about 41% (27%) at 633 nm (780 nm) by connecting the Cu and WOx electrodes for 140 s. The original transparent state can be readily recovered by replacing the Cu foil with the graphite rod. This work throws light on next-generation electrochromic applications for optical/thermal modulation, privacy protection, and information display.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Wenming Liu,Shenyou Yang,Qiuli Zhang,Tianyao He,Yiwei Luo,Jinxiong Tao,Daishe Wu,Honggen Peng
Herein, a series of nano-flower sheet-like alumina spheres (NF-Al 2 O 3 ) with rich unsaturated pentacoordinate Al 3+ sites stabilizing Ru-CeO x catalysts were designed and synthesized for catalytic total oxidation of one typical light alkanes (propane, C 3 H 8 ). The 90 % conversion temperature (T 90 ) and the apparent activation energy (Ea) of Ru-Ce 7 /NF-Al 2 O 3 modified by 7 wt.% of CeO 2 were as low as 207 °C and 56.7 kJ mol −1 , respectively. In addition, it also exhibited superior water, sulfur and carbon dioxide resistance and recycling performance. The excellent catalytic performance of propane total oxidation over Ru-CeO x /NF-Al 2 O 3 is mainly attributed to NF-Al 2 O 3 has rich unsaturated pentacoordinate Al 3+ sites can anchor the Ru-CeO x active species. The anchoring effect of Al 3+ penta on the metal active unit can effectively promote the dispersion of Ru-CeO x active species and stabilize the electronic valence state of Ru 0 . The degradation of C 3 H 8 over Ru-CeO x /NF-Al 2 O 3 conformed to the Mars-van-Krevelen mechanism through two different pathways as revealed by the in situ DRIFTS.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）