MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Pengfei Xu,Qianfeng Li,Ye Chen,Changling Yan,Gongke Wang
Perovskite materials exhibit significant potential in optoelectronic devices, biomedical applications, and fluorescent probes. However, their inherent sensitivity poses substantial challenges to practical implementation. In this study, we synthesized strontium-doped perovskite quantum dot (CsPbBr₃:Sr QDs) nanocomposites (CsPbBr₃:Sr QDs/MSNs) via an in-situ crystal growth method and encapsulated them within mesoporous silica nanospheres to mitigate the limitations of CsPbX₃ QDs in aqueous and polar environments. When dispersed in aqueous solutions for over one month, these nanocomposites demonstrated minimal changes in fluorescence characteristics. Under more stringent conditions (acidic, basic, and elevated temperature environments), the novel perovskite-based inorganic/organic hybrid nanocomposites exhibited superior fluorescence stability. By introducing amino functionalization, the CsPbBr₃:Sr QDs/MSNs-NH₂ achieved selective and stable detection of p-nitrophenol (p-NP), a priority pollutant in water. Due to the inner filter effect (IFE) induced fluorescence quenching mechanism, p-NP exhibited high sensitivity and selectivity within the 0–300 μM range, with a detection limit of 0.74 μM. Furthermore, analysis of actual water samples confirmed that this method offers high recovery rates and low relative standard deviations. This work underscores the promising potential of perovskite-based nanocomposites as effective fluorescent probes for water quality analysis.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Dan Yu,Jiahong He,Taiping Xie,Qiang Xu,Quanxi Zhu,Jun Yang,Jibin An,Feng Ye,Jiankang Wang,Bin Xiang
It is of significant to explore activation mechanism of peroxymonosulfate (PMS) for development of more active and robust metal oxide catalyst. Here, we discover a key role of Sr-O bond in boosting the catalytic activity of SrCo 0.81 Fe 0.19 O 2.78 perovskite. In this catalytic system, oxygen vacancy, Fe 4+ /Fe 3+ , and Co 3+ /Co 2+ redox cycles synergistically enhanced catalytic activity of SrCo 0.81 Fe 0.19 O 2.78 for antibiotic degradation with 100 % Florfenicol (FF) removal in 27 min. Moreover, this catalyst presented excellent stability although oxygen vacancy had a decrease after reuse. The influential factors including coexisting anions on FF degradation were systematically studied. Comparative experiments and theoretical calculation indicate Sr-O ionic bond provides electrons for Co-O and Fe-O covalent bonds to accelerate Fe 4+ /Fe 3+ , and Co 3+ /Co 2+ redox cycles for PMS activation . Finally, the FF degradation pathway over SrCoFe perovskite/PMS system was identified by LC-MS/MS.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2021
·
IF 5.302
Feihu Li,Ying Tang,Jie Li,Weishuang Fang,Laiyuan Ao,Yu Wang,Xiangguang Zhao,Liang Fang
AGe 4 O 9 (A = Ba, Sr) ceramics with hexagonal structure were fabricated by solid-phase reaction. BaGe 4 O 9 sintered at 1060 °C had low ε r ∼9.8, high Q × f ∼78,400 GHz and τ f ∼ -44.2 ppm/°C, whilst SrGe 4 O 9 sintered at 1100 °C exhibited relatively high ε r ∼11.2, low Q × f ∼62,500 GHz and near-zero τ f ∼ -11.7 ppm/°C. The τ f of SrGe 4 O 9 was nearer to zero than that of BaGe 4 O 9 due to the smaller τ ε value and the smaller distortion of the [GeO 6 ] octahedrons. The ‘rattling’ cations at A-site contribute to comparatively high ε r , low Q × f and near-zero τ f values in Sr 1- x Ba x Ge 4 O 9 ceramics. This work presents a new idea of adjusting the microwave dielectric performance (MDP) of ceramics by changing the strength of the rattling effect at A-site.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Lanlan Guo,Wei Zhao,Linlin Dong,Xin Shi,Guodong Wang,Rui Li,Jianliang Cao,Xueli Yang,Xiaolian Liu,Yan Wang
The construction of high-performance sensitive materials is a basis for excellent sensors. Among prior SnS 2 -based sensors, high sensing performance often accompanies high operating temperatures or expensive costs, which limits their practical use. Herein, we employed Sr doping and NaBH 4 treatment strategies to increase the S-vacancies content in the SnS 2 microflowers. Particularly, this composite sensitive material shows large specific surface area, low crystallinity and rich S-vacancies content, which enables this sensor excellent sensing properties toward NO 2 , with a response of 4.7 toward 5 ppm NO 2 at 100 °C. In addition, this sensor has a low detection limit for NO 2 as low as 0.2 ppm, which is a lower value compared to many SnS 2 -based NO 2 sensors as reported. XRD, SEM, TEM, EPR and BET characterization combined with density functional theory (DFT) calculations are adopted to illustrate the enhancement mechanism toward NO 2 of the composite sensitive materials fabricated in this work. This study provides new ideas and scientific basis for the construction of metal sulfide based NO 2 sensors, which has important theoretical significance and application value.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2017
·
IF 3.582
Lingwei Lu,Shuang Ni,Gang Liu,Xiaoxiang Xu
The crystal structure of a photocatalyst generally plays a pivotal role in its electronic structure and catalytic properties . In this work, we synthesized a series of La/Cr co-doped perovskite compounds ATiO 3 (M = Ca, Sr and Ba) via a hydrothermal method . Their optical properties and photocatalytic activities were systematically explored from the viewpoint of their dependence on structural variations, i.e. impact of bond length and bond angles. Our results show that although La/Cr co-doping helps to improve the visible light absorption and photocatalytic activity of these wide band gap semiconductors , their light absorbance and catalytic performance are strongly governed by the Ti O bond length and Ti O Ti bond angle. A long Ti O bond and deviation of Ti O Ti bond angle away from 180° deteriorate the visible light absorption and photocatalytic activity. The best photocatalytic activity belongs to Sr 0.9 La 0.1 Ti 0.9 Cr 0.1 O 3 with an average hydrogen production rate ∼2.88 μmol/h under visible light illumination (λ ≥ 400 nm), corresponding to apparent quantum efficiency ∼ 0.07%. This study highlights an effective way in tailoring the light absorption and photocatalytic properties of perovskite compounds by modifying cations in the A site.
研究领域:
材料科学
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物理化学
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能源化学
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无机化学
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光催化
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MATERIALS LETTERS
·
2026
·
IF 2.6
Hanlu Zhang,Tianqi Li,Yagang Feng,Shichang Cai,Xuexia Chen
CaZnOS is regarded as an excellent phosphor host with relatively favorable doping sites. However, CaZnOS-based long-persistent luminescence (LPL) materials still encounter challenges such as a narrow emission color range and short persistent luminescence lifetime. In this work, we modulated the emission band and LPL properties of a series of Ca 1-x Sr x ZnOS:0.1%Cu,1%Y phosphors through crystal field engineering by controlling the Sr/Ca ratio. The emission peak of the phosphor series was successfully tuned over 524–681 nm (from blue-green to orange-yellow), accompanied by a remarkable enhancement in both emission intensity and afterglow duration as x increases from 0 to 0.9. Moreover, the anomalous luminescence behavior of the SrZnOS:0.1%Cu,1%Y sample implies the crucial role of the Sr/Ca substitution-induced lattice distortion for tailoring the luminescence properties. Thermoluminescence (TL) spectra reveal that the persistent luminescence properties of these phosphors are closely correlated with their trap depth controlled by the Sr substitution ratio. This work provides an important reference for the composition design and development of high-performance LPL phosphors.
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ACS Applied Energy Materials
·
2022
·
IF 6.959
Qin Cao,Ruiming Qiu,Libin Lei,Wenda Zhang,Sihao Deng,Jie Chen,Lunhua He,Jungu Xu
Tetragonal La2BaIn2O7 belongs to the stoichiometric n = 2 members of the Ruddlesden–Popper (RP) structure, with La3+ and Ba2+ cations ordered in the rock salt and octahedral layers, respectively. Herein, a series of alkaline-earth-metal-doped materials La2–xMxBaIn2O7–0.5x (M = Ca, Sr, Ba) were prepared by the traditional solid-state reaction method. The results revealed that the substitutions of Ca/Sr/Ba for La introduced oxygen vacancies and led to good oxide ion conduction, e.g., ∼1.21 × 10–3–1.38 × 10–2 S/cm within 600–900 °C for the specimen La1.7Ba1.3In2O6.85, which was more than 2 orders of magnitude higher than the parent material. However, both the parent and acceptor-doped La2BaIn2O7 showed very limited proton conductions. The energetics of defect formation and oxygen vacancy migrations in La2BaIn2O7-based materials was studied through the static lattice and molecular dynamics (MD) atomistic simulations based on the interatomic potential approach. The defect formation energy calculations for the electrons and holes in La2BaIn2O7 rationalized the experimentally observed pure ionic conduction under low pO2 and mixed ionic and p-type electronic conductions under high pO2, respectively. The MD simulations indicated two-dimensional oxygen vacancy migration within the perovskite slab for the acceptor-doped La2BaIn2O7.
研究领域:
材料科学
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固体离子学
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计算材料物理
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陶瓷材料
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能源材料
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INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2023
·Vol. 24
·期 2
·1274
·
IF 5.6
Yuanhang Zhao,Hong Zhang,Lihua Hong,Xinying Zou,Jiazhuo Song,Rong Han,Jiawen Chen,Yiyan Yu,Xin Liu,Hong Zhao,Zhimin Zhang
Dental caries, particularly secondary caries, which is the main contributor to dental repair failure, has been the subject of extensive research due to its biofilm-mediated, sugar-driven, multifactorial, and dynamic characteristics. The clinical utility of restorations is improved by cleaning bacteria nearby and remineralizing marginal crevices. In this study, a novel multifunctional dental resin composite (DRC) composed of Sr-N-co-doped titanium dioxide (Sr-N-TiO2) nanoparticles and nano-hydroxyapatite (n-HA) reinforcing fillers with improved antibacterial and mineralization properties is proposed. The experimental results showed that the anatase-phase Sr-N-TiO2nanoparticles were synthesized successfully. After this, the curing depth (CD) of the DRC was measured from 4.36 ± 0.18 mm to 5.10 ± 0.19 mm, which met the clinical treatment needs. The maximum antibacterial rate againstStreptococcus mutans(S. mutans) was 98.96%, showing significant inhibition effects (p< 0.0001), which was experimentally verified to be derived from reactive oxygen species (ROS). Meanwhile, the resin exhibited excellent self-remineralization behavior in an SBF solution, and the molar ratio of Ca/P was close to that of HA. Moreover, the relative growth rate (RGR) of mouse fibroblast L929 indicated a high biocompatibility, with the cytotoxicity level being 0 or I. Therefore, our research provides a suitable approach for improving the antibacterial and mineralization properties of DRCs.Keywords:dental resin composite;dental caries;secondary caries;titanium dioxide;antibacterial property;remineralization
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Yan Yu,Lele Zhou,Juntao Tang,Peng Wu,Li Feng,Beixiao Ge,Hui Chen,Jinxing Hu,Shuang Song,Tao Zeng
Adsorption of pollutants onto adsorbents is extremely important for water purification systems. In this study, the dynamic adsorption of radionuclides Co(II) and Sr(II) onto covalent triazine frameworks (CTFs) was explored. The effects of the adsorption conditions such as the amount of CTF (10, 25, and 50 mg), radionuclides concentrations (0.50–500.0 mg L −1 ), and adsorption temperature (293, 303, and 313 K) on the adsorption capacity was examined. Adsorption kinetics data were analyzed by using the pseudo-first-order and pseudo-second-order kinetic models. Langmuir and Freundlich models were used for analyzing adsorption isotherms. The results showed that the Langmuir isotherm and pseudo-second-order models described the experimental data better than the other models. The adsorption equilibrium time of CTF-N and CTF-B are 600 s and 200 s. The maximum monolayer adsorption capacity (q max ) of CTF-B and CTF-N for Co(II) were determined as 50.76 mg g −1 and 60.82 mg g −1 at 303 K. The q max of CTF-B and CTF-N for Sr(II) were 43.12 mg g −1 and 55.89 mg g −1 at 303 K. Thermodynamic analyses indicated that the adsorption process of Co(II) and Sr(II) onto CTF was spontaneous (ΔG < 0) and endothermic (ΔH > 0) and was favored at higher temperature.
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JOURNAL OF PHYSICS-CONDENSED MATTER
·
2021
·Vol. 33
·期 26
·265701
·
IF 2.333
Chengping He,Xue Ming,Qing Li,Xiyu Zhu,Jin Si,Hai-Hu Wen
Recently, superconductivity at about 9–15 K was discovered in Nd1−xSrxNiO2 (Nd-112, x ≈ 0.125–0.25) infinite-layer thin films, which has stimulated enormous interests in related rare-earth nickelates. Usually, the first step to synthesize this 112 phase is to fabricate the RNiO3 (R-113, R: rare-earth element) phase, however, it was reported that the 113 phase is very difficult to be synthesized successfully due to the formation of unusual Ni3+ oxidation state. And the difficulty of preparation is enhanced as the ionic radius of rare-earth element decreases. In this work, we report the synthesis and investigation on multiple physical properties of polycrystalline perovskites Sm1−xSrxNiO3 (x = 0, 0.2) in which the ionic radius of Sm3+ is smaller than that of Pr3+ and Nd3+ in related superconducting thin films. The structural and compositional analyses conducted by x-ray diffraction and energy dispersive x-ray spectrum reveal that the samples mainly contain the perovskite phase of Sm1−xSrxNiO3 with small amount of NiO impurities. Magnetization and resistivity measurements indicate that the parent phase SmNiO3 undergoes a paramagnetic–antiferromagnetic transition at about 224 K on a global insulating background. In contrast, the Sr-doped sample Sm0.8Sr0.2NiO3 shows a metallic behavior from 300 K down to about 12 K, while below 12 K the resistivity exhibits a slight logarithmic increase. Meanwhile, from the magnetization curves, we can see that a possible spin-glass state occurs below 12 K in Sm0.8Sr0.2NiO3. Using a soft chemical reduction method, we also obtain the infinite-layer phase Sm0.8Sr0.2NiO2 with square NiO2 planes. The compound shows an insulating behavior which can be described by the three-dimensional variable-range-hopping model. And superconductivity is still absent in the polycrystalline Sm0.8Sr0.2NiO2.
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JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 23
·13243-13258
·
IF 4.22
Cao Yi,Tang Peiyuan,Li Shijingmin,Qiu Wenfeng
Abstract Since the previous research confirms the lanthanum titanate (LTO) flexible self-supporting film can be considered as excellent energy storage material, we intend to maximize the performance of LTO to provide higher energy density for practical application. In order to achieve this goal, the Sr element was a choice to substitute with La for increasing the amount of oxygen vacancies in this study, and mechanical flexibility of the film was also maximally preserved. For determining the most appropriate amount of Sr doping, a serious of Sr-doped LTO films marked as LTO- x (0.1 ≤ x ≤ 0.5) were synthesized by electrospinning combined with calcination method. After analyzed by the XRD, SEM, TEM, XPS and electrochemical work station, the LTO-0.3 sample shows the best properties with a maximum capacitance of 1.8 F·cm −2 at 2 mA·cm −2 . As a result of that, we fabricated the flexible all-solid-state supercapacitor device with two LTO-0.3 electrodes and PVA-Na 2 SO 4 gel. This LTO-0.3//LTO-0.3 device exhibits excellent cycling stability, outstanding flexibility and high energy density of 209.4 μWh·cm −2 with the corresponding power density of 2.1 mW·cm −2 . Graphical Abstract
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CHEMICAL PHYSICS LETTERS
·
2020
·
IF 2.029
Jianxia Zhang,Li Liu,Chao Sun,Xiaosong Li,Bing Zhao,Xiangnan Ju,Chunxia Tian,Dan Sun,Guijun Nian
The 3D layered α-Fe 2 O 3 microflowers assembled by pure and Sr-doped nanosheets were prepared by hydrothermal and annealing methods. SEM morphological characterization results show that after the introduction of Sr, the microflowers are assembled from more layered nanosheets. XPS indicates that the material can provide more surface oxygen vacancy defects and oxygen adsorption sites, which is beneficial to the improvement of gas sensitivity. The response of 3 wt% Sr-doped α-Fe 2 O 3 with alkaline earth metal element Sr to 100 ppm ethanol (82.1) is 2.37 times that of pure α-Fe 2 O 3 (34.5) to ethanol at low temperature (220 °C).
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