CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xiaohong Li,Xiaozhen Zhang,Renhua Chen,Huafeng Liu,Leying Wang,Si Cheng,Yongzhi Yu
The internal modification with rare earth ion doping proved to be a very effective strategy for improving the luminescent properties of NaYF 4 -based upconversion materials. However, greatly enhancing the luminescence efficiency of NaYF 4 :Yb 3+ /Er 3+ remains a major challenge. Herein, the effects of Sn 4+ doping on the structure and luminescent performance of such material were explored. The hydrothermal molten-salt method was applied to synthesize the Sn 4+ -doped NaYF 4 :Yb 3+ /Er 3+ upconversion materials, and their crystal structures, morphologies, surface chemical composition and element states, and luminescence performance were characterized. It was found that Sn 4+ doping can significantly enhance the luminescence intensity and tailor the chromaticity of NaYF 4 :Yb 3+ /Er 3+ . In particular, the green (G) and red (R) luminescence intensity levels of the 30 mol% Sn 4+ doped material were increased by factors of 26.97 and 38.91, respectively. The R/G ratio was incremented from 0.34 for the undoped material to 0.83 for the 40 mol% Sn 4+ doped counterpart. The Sn 4+ doping led to the change of lattice distortion and crystal growth pattern of NaYF 4 :Yb 3+ /Er 3+ . The mechanism for Sn 4+ doping to affect the luminescence properties of the prepared upconversion material was also explored. The changes in luminescence intensity levels and R/G ratios could be attributed to the highly asymmetric distorted lattice and crystal field resulting from Sn 4+ doping.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 20
·10954-10963
·
IF 2.936
Ting Song,Meng Zhang,Yuxue Liu,Jian Yang,Zheng Gong,Hong Yan,Hancheng Zhu,Duanting Yan,Chunguang Liu,Changshan Xu
Spinel-phase Zn2Ga2.98Ge0.75–xSnxO8:Cr0.023+ (ZGGSO:Cr3+) nanoparticles with various Sn4+ concentrations were prepared by a hydrothermal method in combination with a post-annealing in vacuum at high temperature. For these nanoparticles, the observed near infrared (NIR) persistent luminescence peaked at ∼697 nm and originates from the 2E, 4T2 (4F) → 4A2 transitions of Cr3+ and the afterglow time exceeds 800 min. For both the interior and surface Cr3+ ions in the ZGGSO host, it can be found that the increased energy transfer from Cr3+ to the deep trap (anti-site defects, ) after the substitution of Ge4+ by Sn4+ plays a key role in enhancing the persistent luminescence of the ZGGSO:Cr3+ nanoparticles. Strikingly, this energy transfer process can be controlled through the variations in the crystal field strength and the trap depths. Our results suggest that not only Sn4+ substitution can improve in vivo bioimaging but also the existence of deep traps in ZGGSO:Cr3+ nanoparticles is helpful for retracing in vivo bioimaging at any time.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yingkui Yan,Ye Wang,Zhenxin Zhang,Songtao Zhang,Jinhua Ye,Li Shi
The exploration of low-cost and efficient cocatalysts is vitally important for attaining reliable and affordable photocatalytic CO 2 conversion. Here, it is found that post-transition metal ions (Sn 4+ ) doped CdSe/S colloidal crystal can serve as effective photocatalyst for CO 2 reduction under visible light, in which Sn 4+ serves as an ionized cocatalyst. Specifically, Sn 4+ doped CdSe/S colloidal crystal shows an improved and stable photocatalytic CO 2 reduction performance with CO generation rate of 50.3 μmol h −1 and H 2 generation rate of 7.8 μmol h −1 in the presence of triethanolamine as sacrificial agent. The improved photocatalytic activity can be ascribed to the increased light harvesting ability, enhanced CO 2 adsorption capability and the improved surface charge transfer efficiency induced by Sn 4+ dopant.
研究领域:
材料科学
·
光催化
·
环境化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2018
·
IF 4.841
Zhongwei Wang,Hu Li,Wenfeng Zhao,Song Yang
A novel carbon-increasing catalytic route via one-pot cascade acylation–alkylation of biomass-derived 2-methylfuran and acetic anhydride over Sn 4+ -exchanged K-10 montmorillonite (Sn 4+ -K-10) was demonstrated to be highly efficient for the production of C 17 oxygenate 1,1,1-tris(5-methyl-2-furyl)ethane with a high yield of 87% and 90% selectivity at 60 °C in 8 h under solvent-free conditions. Characterization techniques manifested Sn 4+ -K-10 to have layered and mesoporous (5.7 nm) texture structure, Lewis–Brønsted acid paired sites and uniformly dispersed Sn species, which greatly contributed to the predominant reactivity and recyclability of Sn 4+ -K-10. Systematic studies based on GC–MS and NMR were also conducted to elucidate the catalytic mechanism.
研究领域:
化学工程
·
催化科学
·
可再生资源
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2023
·
IF 4.1
Jing Zhao,Fangfang Wu,Xiuxun Han
Precursor design plays an important role in preparing high-quality Cu 2 ZnSn(S, Se) 4 (CZTSSe) absorber layers via solution coating method. In this work, SnCl 4 and SnCl 2 with different molar ratios were utilized as Sn source in the precursor solution to investigate effects of Sn oxidation state on the film growth process and the related solar cell device performance. Sn 4+ -rich and Sn 2+ -rich precursors were found to follow different reaction paths in obtaining CZTSSe grains, thus resulting in quite different crystallinity and morphology of the absorber. For Sn 4+ -rich precursor system, the direct Se substitution reaction of macroscopically disordered CZTS precursor calls for relatively high temperature to eliminate the double-layer structure and form large-size CZTSSe grains. For Sn 2+ -dominated precursor solution, however, the reaction of binary compound phases with the catalysis of low-melting-point Sn(S, Se) 2 prefers relatively low temperature during the selenization process. The work demonstrates that both types of precursors (or reaction paths) could actually lead to high-quality CZTSSe absorbers and solar cell devices with conversion efficiency higher than 8%, upon the proper selection of selenization conditions.
研究领域:
材料科学
·
太阳能
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 8
·3376-3380
·
IF 9.931
Guangbao Wu,Yufeng Xue,Lei Wang,Xin Wang,Guangming Chen
Thermoelectrochemical (TEC) materials are newly developed energy materials, which are promising and cost-effective in harvesting waste thermal energy based on redox electrolytes. However, liquid-state electrolytes and low thermoelectric (TE) performance seriously limit their application. Here, we report the first gel-state TEC (gel-TEC) materials based on incorporating Sn2+/Sn4+ electrolytes into polymer/single-wall carbon nanotube (SWCNT) composites. A porous 3D network morphology is observed, and the effect of SWCNT content on the tensile mechanical properties and TE performance is studied. Due to their large Seebeck coefficients and significantly enhanced electrical conductivities (10.5 ± 0.8 S m−1), the power factor at room temperature can reach 13.5 ± 3.0 μW m−1 K−2, greater than those of liquid-state TEC materials and possibly the highest for gel-TEC materials. The gel-state, outstanding mechanical properties and excellent TE performance of the gel-TEC materials will speed up and widen their application in various fields such as flexible devices, wearable electronics, e-skins, etc.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Zihan Wang,Yumin Hao,Yihong Chen,Wenjuan Dong,Yang Liu,Jing Li,Hong Gao,Xu Wang,Shaomin Shuang,Chuan Dong,Xiaojuan Gong
Developing carbon quantum dots (CQDs) with the solvatochromic effect and exploring multifunctional applications remains challenging. Herein, robust solvatochromic carbon quantum dots ( RS -CQDs) with emission shift up to ∼62 nm from yellow to red was fabricated by the hydrothermal method. The RS -CQDs was used to detect water and Sn 4+ in the linear ranges and limits of detection of 2.0–97.6% and 0.14% and 6.24–53.18 μM and 66.3 nM, respectively, and was further applied to determine Sn 4+ in practical water samples with satisfactory results. In addition, RS -CQDs exhibited bright red emission in oil media with a 9.7-fold increase in fluorescence relative to aqueous media, making them a wash-free probe for specifically staining lipids. Compared to the commercial lipid marker BODIPY 493/503, the RS -CQDs-based probe has significant advantages, such as longer emission, larger Stokes shift, and better photostability, ensuring that RS -CQDs-based marker can implement real-time and wash-free monitoring and imaging of lipids in living cells, liver tissues, zebrafish embryos, and zebrafish larvae. This study provides a novel research direction for the development of metal-doped CQDs by demonstrating RS -CQDs as the viability of fluorescence probes for water and Sn 4+ detection and the efficiency of RS -CQDs as a fluorescent marker for lipid imaging.
研究领域:
材料科学
·
分析化学
·
生物医学工程
·
细胞生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yi-Fan Gao,Rui Zou,Guang-Feng Chen,Bo-Mei Liu,Yong Zhang,Ju Jiao,Ka-Leung Wong,Jing Wang
Featured with excellent biocompatibility and background-free biomedical imaging, near infrared persistent luminescence (NIR-PersL) nanomaterials synthesized by mesoporous silica nanoparticles (MSNs) template have captured increasing attentions to be as a tumor theranostic nanoplatform. Unfortunately, many researches in the past decades have mainly focused on bioimaging performance of NIR-PersL nanomaterials themselves but not synergistically on tailoring the pore volume of the MSNs to optimize the drug loading/releasing performance, which greatly limits their potential application in tumor theranostics. In this work, we propose a tailorable large-pore mesoporous-silica-assisted synthesis strategy to synthesize a series of ZnGa 2 O 4 :Cr 3+ /Sn 4+ @MSNs (ZGOCS@MSNs) NIR-PersL nanospheres as nanoplatform. The ZGOCS@MSNs possess average diameters of ~ 80 nm. More interestingly, the mass ratio of ZGOCS to MSNs (MRZM) increases with the increasing of pore sizes of MSNs and the NIR-PersL performances of ZGOCS@MSNs enhance with the increase of MRZM, suggesting that MRZM plays an important role in optimizing NIR-PersL performance of the nanospheres. In vitro and in vivo NIR-PersL imaging further confirm the MRZM-dependent performance enhancement in NIR-PersL nanospheres. More importantly, the employment of large pore MSNs maintains the mesoporous structure of NIR-PersL nanospheres and the residual pore volume of ZnGa 2 O 4 :Cr 3+ /Sn 4+ @MSNs is high enough and available for efficient drug loading/releasing. Benefited from excellent rechargeable tumor NIR-PersL imaging ability and large residual cavities, ZGOCS@MSNs show high dose (~53%) of loading DOX and exhibit outstanding cancer cell killing efficiency, implying the MRZM also plays an important role in optimizing the drug loading/releasing performance of the nanospheres. In summary, the as-synthesized high performance ZnGa 2 O 4 :Cr 3+ /Sn 4+ @MSNs bi-functional nanoplatform showcases its great potential for imaging-guided cancer chemotherapy. We expect our work could take the development of NIR-PersL-based theranostic nanoplatforms a step forward.
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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Xiaomeng Ma,Jialun Du,Xueli Ji,Lintao Liu,Haitao Wu,Hideo Kimura,YiZhong Lu,Zhenxing Yue
In this work, Nd 2 (Zr 1- x Sn x ) 3 (MoO 4 ) 9 (0.02 ≤ x ≤ 0.1) (NZSM) ceramics were successfully obtained through conventional solid-state route. Phase analysis, microstructure, and properties were investigated scientifically by XRD , SEM, and network analyzer, respectively. XRD results revealed that all samples with different substitution amounts of Sn 4+ formed the pure phase with R-3c space group. The permittivity was related to the polarizability and the bond of Zr2-O5, the bond of Nd-O2 possessed a positive influence on Q×f . The reduced octahedral distortion and increased bond energy made the temperature coefficient more stable. Infrared reflection spectrum results showed that the permittivity was mainly caused by the absorption of phonon oscillation. The optimum properties ( ε r = 10.34, Q×f = 74,795 GHz, τ f = −13.55 ppm/°C) were obtained when x = 0.02 sintered at 750 °C.
研究领域:
材料科学
·
陶瓷
·
微波介电材料
·
固态化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 43
·27024-27032
·
IF 3.108
Jinghui Wang,Hui Li,Sugang Meng,Xiangju Ye,Xianliang Fu,Shifu Chen
Controlled synthesis of Sn-based oxides with a different valence state is still a challenge. Here, we developed a facile hydrothermal method for selective preparation of SnO2, Sn2+ doped SnO2 (Sn2+–SnO2), and SnO/SnO2 composites, and SnO with SnCl2 as a precursor. The valence state of Sn was regulated successively from Sn4+ to Sn2+ through controlling the hydrothermal solution from an O2-rich to an O2-deficient atmosphere, which was achieved by adding H2O2 or urea into the solution. The structure, absorption, morphology, and the visible light photocatalytic performance of the products were investigated systematically. SnO2, Sn2+–SnO2, SnO/SnO2, and SnO could be prepared in a H2O2-contained, H2O, urea-contained, and N2 purged urea-contained solution, respectively. For Sn2+–SnO2, the doping amount of Sn2+ could be further tuned by varying the hydrothermal temperature, while for SnO/SnO2, the coupling amount of SnO could be controlled by the dosage of urea. Visible-light-induced photocatalytic degradation of methyl orange was achieved successfully on Sn2+–SnO2 and SnO/SnO2. However, further work is still required to improve the stability of the samples due to vulnerability of Sn2+.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 2
·1-10
·
IF 2.8
Guan Yeqing,Zhang Jinxian,Wang Fenglin,Li Wei,Mao Haijun,Liu Zhuofeng,Zhang Weijun,Chen Xingyu
The Ca 0.245 Li 0.325 Nd 0.395 Ti 1− x Sn x O 3 ( x = 0–0.12) ceramics were prepared by the traditional solid-state reaction method. The effects of Sn 4+ substitution for Ti 4+ on the phase composition, microstructure, and microwave dielectric properties of Ca 0.245 Li 0.325 Nd 0.395 Ti 1− x Sn x O 3 (CLNTS x ) were investigated in this work. The X-ray diffraction results showed that the ceramics had a single orthorhombic perovskite structure when x = 0–0.09. However, a secondary phase SnO 2 was observed with x > 0.09. The SEM micrographs indicated that the proper Sn 4+ substitution for Ti 4+ promoted the grain growth and homogenization. The analysis results of Raman spectroscopy revealed the correlation between vibration modes and microwave dielectric properties of CLNTS x ceramics with different Sn 4+ contents. The degree of cation order was related to the full width at half maximum (FWHM) of the Raman spectrum, and a lower FWHM value indicates higher cationic order and Q × f 0 value. The excellent microwave dielectric properties with ε r = 98, Q × f 0 = 3320 GHz, and τ f = 2.6 ppm/°C were obtained in the ceramics with x = 0.09 sintered at 1350 °C for 4 h.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Materials Interfaces
·
2019
·Vol. 6
·期 13
·1900669
·
IF 4.713
Siyuan Li,Yong Zhang,Wei Yang,Xiaosheng Fang
Herein, Sn 4+ -doped copper (I) iodide (CuI) is prepared via a facile, cost-efficient solution process, and the properties of Sn 4+ -doped CuI, including morphology, crystalline phase, as well as optical and electrical properties, are investigated by varying the Sn 4+ concentration. And by constructing transparent Sn 4+ -CuI/ZnO hybrid UV photodetectors, the potential of Sn 4+ -CuI as a p-type material for high-performance photodetection is investigated. It is found that Sn 4+ doping has great effect on the morphology as the formation of Sn 4+ -CuI thin sheets is observed, and the resistivity of Sn 4+ -CuI could be tuned by controlling Sn 4+ addition. The Sn 4+ -CuI/ZnO hybrid photodetectors exhibit obviously enhanced photodetecting performance outperforming ZnO film and CuI/ZnO photodetectors by the same preparation method, including significantly improved on/off ratio, spectral responsivity, and shortened responsive time. The enhanced performance of Sn 4+ -CuI/ZnO hybrid photodetectors mainly arises from the formation of type-II p-Sn 4+ -CuI/n-ZnO heterojunctions, and the better interface contact leads to higher carrier separation efficiency due to the existence of Sn 4+ -CuI thin sheets. And the improved performance is also related to the optimized resistivity of Sn 4+ -CuI. This study sheds light on the potential of doped CuI toward transparent, high-performance photodetectors in the future.
✓ 已验证
DOI
高影响因子
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