Solid State Sciences最新文献_第7页

H2O2-assisted Bi3NbO7 loaded on porous carbon for enhancing the photocatalytic degradation of tetracycline 多孔碳上负载的 H2O2- 辅助 Bi3NbO7 可提高四环素的光催化降解能力

IF 3.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Solid State Sciences

Pub Date : 2024-11-19 DOI: 10.1016/j.solidstatesciences.2024.107763

Yao Wang , Pengzhan Zhang , Fan Li , Liang Zhang , Bing Xu , Kangkang Wang , Zhixian He , Yuyan Sun , Shengnan Zhang

Bi₃NbO₇ loaded on porous carbon (BNO/PC) composite materials has been prepared by the in-suit sol-gel method. The photocatalytic efficacy of the BNO/PC composite has been evaluated by degrading tetracycline (TC) in an environment of visible light and hydrogen peroxide. Moreover, the relevant influencing factors of TC degradation efficiency have been explored through a series of condition optimization experiments. UV–vis DRS and PL tests showed that the loading on porous carbon significantly broadens the visible light response range of the catalyst and improves the separation efficiency of photogenerated carriers. Compared with the bare BNO, the specific surface area and average pore diameter of the BNO/PC composite material increased greatly. The optimal sample of 35 % BNO/PC exhibited outstanding visible light response ability and excellent charge separation efficiency. The “cata + H₂O₂+vis” system had the highest photocatalytic activity, with TC degradation reaching 86.9 % after 60 min of visible light illumination. The addition of hydrogen peroxide (H₂O₂) promoted the formation of more powerful active substances. Following this, a mechanism for photocatalytic degradation has been proposed.

采用内服溶胶-凝胶法制备了负载在多孔碳上的 Bi3NbO7（BNO/PC）复合材料。通过在可见光和过氧化氢环境下降解四环素（TC），评估了 BNO/PC 复合材料的光催化功效。此外，还通过一系列条件优化实验探讨了四环素降解效率的相关影响因素。UV-vis DRS 和 PL 测试表明，多孔碳的负载显著拓宽了催化剂的可见光响应范围，提高了光生载流子的分离效率。与裸 BNO 相比，BNO/PC 复合材料的比表面积和平均孔径都大大增加。BNO/PC 含量为 35% 的最佳样品具有突出的可见光响应能力和优异的电荷分离效率。cata + H2O2 +vis "体系的光催化活性最高，在可见光照射 60 分钟后，TC 降解率达到 86.9%。过氧化氢（H2O2）的加入促进了更强活性物质的形成。据此，提出了一种光催化降解机制。

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引用次数: 0

Investigation of structural, magnetic, optical and dielectric characteristics of Al-doped MgFe2O4 nanoparticles 掺铝MgFe2O4纳米颗粒的结构、磁性、光学和介电特性研究

IF 3.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Solid State Sciences

Pub Date : 2024-11-19 DOI: 10.1016/j.solidstatesciences.2024.107761

R. Srimathi , N.V.S.S.Seshagiri Rao , A. Merlin , R. Kiruthika , A. Selvaraj , Omar H. Abdelkader , Chandra Sekhar Dash , S. Revathi , Anis Ahamed , Jothi Ramalingam Rajabathar , M. Sundararajan , S. Yuvaraj , L. Rajadurai

In this study, MgAlₓFe₂₋ₓO₄ (0 ≤ x ≤ 0.5) nanoparticles were synthesized via the combustion method to investigate the structural, magnetic, optical, and dielectric effects of Al doping on MgFe₂O₄ ferrite. X-ray diffraction (XRD) analysis confirmed the successful formation of the MgFe₂O₄ crystalline phase, with crystallite sizes ranging from 34 to 45 nm. Field emission scanning electron microscopy (FE-SEM) revealed a spherical morphology, and energy-dispersive X-ray spectroscopy (EDX) confirmed the presence of magnesium, iron, oxygen, and the introduced aluminum. Diffuse reflectance spectroscopy measured an optical band gap between 2.03 and 2.13 eV, indicating Al's influence on electronic properties. Dielectric measurements showed that the Al-doped samples exhibited enhanced dielectric constants and AC conductivity compared to the undoped ferrite, making them promising candidates for optoelectronic, photocatalytic, and energy storage applications. These results highlight the potential of Al-doped MgFe₂O₄ nanoparticles in advancing functional materials for data storage and energy-related technologies.

本研究通过燃烧法制备了MgAlₓFe₂₄ₓO₄（0≤x≤0.5）纳米颗粒，研究了Al掺杂对MgFe₂O₄铁氧体的结构、磁性、光学和介电效应。x射线衍射（XRD）分析证实MgFe₂O₄晶相成功形成，晶粒尺寸在34 ~ 45 nm之间。场发射扫描电镜（FE-SEM）显示出球形形貌，能量色散x射线光谱（EDX）证实了镁、铁、氧和引入铝的存在。漫反射光谱测量到的光学带隙在2.03 ~ 2.13 eV之间，表明Al对电子性质的影响。电介质测量表明，与未掺杂的铁氧体相比，al掺杂样品具有更高的介电常数和交流电导率，使其成为光电子，光催化和储能应用的有希望的候选者。这些结果突出了al掺杂MgFe₂O₄纳米颗粒在推进数据存储和能源相关技术的功能材料方面的潜力。

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引用次数: 0

Synthesis and characterization of WO3-GO nanocomposite for hydrogen storage, electrochemical, antibacterial and anticancer applications 用于储氢、电化学、抗菌和抗癌的 WO3-GO 纳米复合材料的合成与表征

IF 3.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Solid State Sciences

Pub Date : 2024-11-19 DOI: 10.1016/j.solidstatesciences.2024.107764

M. Muniyalakshmi , C. Anantha Prabhu , D. Thilaga Sundari , R. Sarika , D. Silambarasan , V. Prasanna Venkatesh

Tungsten trioxide nanoparticles (WO₃ NPs), Graphene oxide nanosheets (GO NSs), and WO₃-GO (50 mg and 100 mg) nanocomposites (NCs) were successfully synthesized by using precipitation, modified Hummer's and ultrasonication methods, respectively. Various characterization techniques were used to confirm the formation of individual and composite materials. Hydrogen storage, electrochemical, antibacterial and anticancer properties of the synthesized materials were studied. Formation of the composite was confirmed by XRD, Raman and XPS analyses. Surface area and pore size distribution of WO₃ NPs and WO₃-GO NC were studied by using BET analysis. Hydrogen storage capacity of WO₃-GO 50 mg and WO₃-GO100 mg NCs was found to be 1.05 and 2.08 wt%, respectively. XRD, Raman, elemental and TG analyses were used to examine the adsorption and desorption of hydrogen. WO₃-GO NCs showed higher specific capacitance as compared to WO₃ NPs. Antibacterial activity against E. coli, S. aureus bacteria and anticancer effect against human breast cancer cells of WO₃ NPs and WO₃-GO NC were examined. Based on the studies, it is evident that the inclusion of GO enhanced the hydrogen storage, specific capacitance, antibacterial and anticancer activities of the composite.

采用沉淀法、改良悍马法和超声法分别成功合成了三氧化钨纳米颗粒（WO3 NPs）、氧化石墨烯纳米片（GO NSs）和 WO3-GO （50 毫克和 100 毫克）纳米复合材料（NCs）。利用各种表征技术确认了单个材料和复合材料的形成。研究了合成材料的储氢、电化学、抗菌和抗癌性能。X射线衍射、拉曼和 XPS 分析证实了复合材料的形成。利用 BET 分析法研究了 WO3 NPs 和 WO3-GO NC 的表面积和孔径分布。发现 WO3-GO 50 mg 和 WO3-GO100 mg NCs 的储氢能力分别为 1.05 和 2.08 wt%。XRD、拉曼、元素和 TG 分析被用来研究氢的吸附和解吸。与 WO3 NPs 相比，WO3-GO NCs 显示出更高的比电容。研究还考察了 WO3 NPs 和 WO3-GO NC 对大肠杆菌和金黄色葡萄球菌的抗菌活性以及对人类乳腺癌细胞的抗癌效果。研究结果表明，GO 的加入增强了复合材料的储氢、比电容、抗菌和抗癌活性。

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引用次数: 0

Self-assembly of Cucurbit[6]uril-Silicotungstic acid and adsorption properties for cationic dyes 葫芦[6]脲-硅钨酸的自组装及其对阳离子染料的吸附特性

IF 3.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Solid State Sciences

Pub Date : 2024-11-17 DOI: 10.1016/j.solidstatesciences.2024.107760

Liling Zeng, Xianyan Ao, Manli Xu, Yunqian Zhang, Zhu Tao

The development of environmentally friendly adsorbents with low cost and high selectivity is often more able to meet the needs of practical applications. In this study, a novel adsorbent Q[6]-STA capable of rapidly and effectively adsorbing cationic dyes was prepared by self-assembly of cucurbit[6]uril (Q[6]) and silicotungstic acid (STA). Q[6]-STA assembly has good thermal stability and significantly improved specific surface area and porosity. The adsorption capacities of Q[6]-STA for crystal violet (CV), malachite green (MG) and methylene blue (MB) are 475.59, 351.98 and 238.16 mg/g, respectively. The efficient adsorption performance for cation dyes is attributed to the high electronegativity of Q[6]-STA surface. This also makes the adsorbent exhibit high selectivity for cationic dyes in anionic/cationic mixed dyes. Thermodynamic analysis shows that the adsorption procedure of Q[6]-STA is unprompted and endothermal. Electrostatic interaction and π-π conjugation effect are possible adsorption driving forces. In the regeneration experiment, the adsorbent is easy to be separated and desorbed, can be recycled, and has good stability.

开发低成本、高选择性的环保型吸附剂往往更能满足实际应用的需要。本研究通过葫芦[6]脲（Q[6]）和硅钨酸（STA）的自组装制备了一种能够快速有效吸附阳离子染料的新型吸附剂 Q[6]-STA。Q[6]-STA 组装具有良好的热稳定性，比表面积和孔隙率显著提高。Q[6]-STA 对结晶紫（CV）、孔雀石绿（MG）和亚甲基蓝（MB）的吸附容量分别为 475.59、351.98 和 238.16 mg/g。阳离子染料的高效吸附性能得益于 Q[6]-STA 表面的高电负性。这也使得该吸附剂对阴离子/阳离子混合染料中的阳离子染料具有较高的选择性。热力学分析表明，Q[6]-STA 的吸附过程是非催化和内热的。静电作用和 π-π 共轭效应是可能的吸附驱动力。在再生实验中，吸附剂易于分离和解吸，可以循环使用，稳定性好。

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引用次数: 0

Antimony (Sb)-doped PbTe nanostructured alloys with improved optical and thermoelectrical characterizations for clean energy applications 掺杂锑 (Sb) 的 PbTe 纳米结构合金具有更好的光学和热电特性，可用于清洁能源应用

IF 3.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Solid State Sciences

Pub Date : 2024-11-16 DOI: 10.1016/j.solidstatesciences.2024.107762

G.A. Ahmed , A.M. Adam , Vyacheslav Khavrus , Silke Hampel , E.M.M. Ibrahim

The current work investigates the influence of antimony doping on the morphology, optical behavior, and thermoelectric performance of PbTe nanostructures fabricated using the hydrothermal method. Analyses employing X-ray diffraction (XRD) and Raman spectroscopy techniques asserted the existence of the cubic phase, a defining characteristic of PbTe compounds. The morphology and internal structure of the samples are examined by the scanning and high-resolution transmission electron microscopes. The photoluminescence spectra show a band gap energy around 3.0 eV which is higher than that of the bulk sample. Raman spectra show three peaks corresponding to longitudinal optical (LO) phonon mode and higher-harmonic multiphonon process of PbTe. The PL spectra exhibit a strong peak at the wavelength 401 nm which is ascribed to a recombination of excitons and/or shallowly trapped electron–hole pairs. The thermoelectric properties are studied in the temperature range of 300–500 K and confirm the domination of p-type conduction in the whole temperature range. The electrical conductivity (σ) versus temperature showed thermally activated behavior as the charge carrier mobility is activated and the average carrier kinetic energy increases with temperature. Activation energy was obtained from the plots of Ln σ as a function of 1000/T. The recorded values were found at 62, 50,73 and 34 meV for x = 0, 0.04, 0.06 and 0.08, respectively. The Seebeck coefficients (S) of the synthesized nanostructures revealed a dominance of p-type conduction due to consistently positive S values. The S-T plots exhibit an initial increase in S with temperature at lower values (T < Tₛ). However, a transition occurs at a specific temperature (Tₛ), marked by a step change in S from positive to negative values, followed by a decrease in S with further temperature rise (T > Tₛ). The highest Seebeck coefficient was observed around 196.2 μV/K and recorded at 418 K for the sample of x = 0.04 Sb content. The largest power factor was recorded at 13.6 × 10⁻⁵ W. m⁻¹. K⁻², obtained for pure PbTe at 438 K due to the high value of electrical conductivity.

目前的工作研究了掺锑对水热法制造的碲化镉纳米结构的形态、光学行为和热电性能的影响。利用 X 射线衍射 (XRD) 和拉曼光谱技术进行的分析表明，存在立方相，这是碲化镉化合物的显著特征。扫描电子显微镜和高分辨率透射电子显微镜对样品的形态和内部结构进行了检测。光致发光光谱显示带隙能量约为 3.0 eV，高于块状样品的带隙能量。拉曼光谱显示出三个峰值，分别对应于 PbTe 的纵向光学（LO）声子模式和高次谐波多声子过程。聚光光谱在波长 401 nm 处显示出一个强峰值，这是由于激子和/或浅俘获电子-空穴对的重组所致。在 300-500 K 的温度范围内对热电性能进行了研究，结果证实在整个温度范围内 p 型传导占主导地位。电导率（σ）与温度的关系表现出热激活行为，因为电荷载流子迁移率被激活，平均载流子动能随温度升高而增加。活化能是从 Ln σ 与 1000/T 的函数关系图中获得的。在 x = 0、0.04、0.06 和 0.08 时，记录的值分别为 62、50、73 和 34 meV。合成纳米结构的塞贝克系数（S）显示，由于 S 值始终为正，因此 p 型传导占主导地位。S-T 图显示，在较低值 (T < Tₛ)时，S 值最初随温度升高而增加。然而，在特定温度（Tₛ）下会发生转变，其标志是 S 值从正值阶跃变为负值，随后随着温度的进一步升高（T >Tₛ），S 值下降。对于 x = 0.04 Sb 含量的样品，最高塞贝克系数约为 196.2 μV/K，记录于 418 K。最大的功率因数为 13.6 × 10-5 W. m-1.K-2，这是纯碲化镉在 438 K 时获得的，原因是其电导率值很高。

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引用次数: 0

Development of graphene/MWCNT/Ag2Se hybrid thermoelectric materials with different concentrations of PEDOT:PSS for low-temperature applications 开发具有不同浓度 PEDOT:PSS 的石墨烯/MWCNT/Ag2Se 混合热电材料，用于低温应用

IF 3.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Solid State Sciences

Pub Date : 2024-11-15 DOI: 10.1016/j.solidstatesciences.2024.107759

Gökhan Gürlek , Şeyma Özkan , Mert Şener , B. Oğuz Gürses , Yoldaş Seki

Studies in low-temperature applications in the fields of medicine and wearable technologies are limited to thermoelectric works with commercial poly(3,4-ethylenedioxy-thiophene):polystyrenesulfonate (PEDOT:PSS) aqueous solutions. Unlike other studies, in this study, the effects of adding graphene, multi-walled carbon nanotube (MWCNT) and silver selenide into PEDOT:PSS at different concentrations in the production of semiconductor polymer inks on the thermoelectric properties were examined using Taguchi analysis. In the examination without adding additives, as the ratio of PEDOT:PSS increased from 1 % to 3 % and 5 %, 2.50 and 4.92 times increase in electrical conductivity and 1.19 and 1.49 times increase in the Seebeck coefficient were observed, respectively. P- and n-type inks were produced in three different concentrations using four different materials. According to the results of the study, to obtain p-type material with good performance, the concentration of PEDOT:PSS in the mixture must be high and the Ag₂Se concentration must be low, and also to get a high-performance n-type material, the concentration of Ag₂Se must be as high as the homogeneous mixture allows, and PEDOT:PSS concentration must be low. When the highest Power Factor and Figure of Merit results were evaluated, PPp9 was found for p-type material and PPn2 was found for n-type material, and it is considered that these inks are suitable for printing with 3D printing technology.

医学和可穿戴技术领域的低温应用研究仅限于使用商用聚（3,4-乙二氧基噻吩）：聚苯乙烯磺酸盐（PEDOT:PSS）水溶液进行热电工作。与其他研究不同的是，本研究采用田口分析法考察了在生产半导体聚合物油墨时向 PEDOT:PSS 中添加不同浓度的石墨烯、多壁碳纳米管（MWCNT）和硒化银对热电性能的影响。在不添加添加剂的情况下，随着 PEDOT:PSS 的比例从 1 % 增加到 3 % 和 5 %，电导率分别增加了 2.50 倍和 4.92 倍，塞贝克系数分别增加了 1.19 倍和 1.49 倍。使用四种不同的材料生产了三种不同浓度的 P 型和 n 型油墨。研究结果表明，要获得性能良好的 p 型材料，混合物中 PEDOT:PSS 的浓度必须高，Ag2Se 的浓度必须低；要获得高性能的 n 型材料，Ag2Se 的浓度必须在均匀混合物允许的范围内尽可能高，PEDOT:PSS 的浓度必须低。在评估最高功率因数和优越性结果时，发现 p 型材料的功率因数为 PPp9，n 型材料的功率因数为 PPn2，因此认为这些油墨适合使用 3D 打印技术进行打印。

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引用次数: 0

The approach of increasing incident photon absorption and decreasing charge recombination in solar cells by regulating the bandgap energies of the CdSe0.3S0.7/CdSe photosensitizer layer 通过调节硒化镉 0.3S0.7/CdSe 光敏剂层的带隙能量来增加太阳能电池对入射光子的吸收和减少电荷重组的方法

IF 3.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Solid State Sciences

Pub Date : 2024-11-13 DOI: 10.1016/j.solidstatesciences.2024.107758

Saeedeh Souri, Maziar Marandi

CdSe_0.3S_0.7/CdSe quantum dot sensitized solar cells are a desirable choice for increasing photovoltaic efficiency due to their high light-harvesting efficiency. In this study, the CdSe_0.3S_0.7 chalcogenide quantum dots were adsorbed onto the TiO₂ NPs mesoporous film using the successive ionic layer adsorption and reaction (SILAR) method with variation cycles ranging from 1 to 7. when the thickness of the CdSe_0.3S_0.7 quantum dots is modified, the quantum dot sensitized solar cell with TiO₂ NPs/CdSe_0.3S_0.7(5c)/ZnS photoanode shows higher short circuit current density (J_SC), open circuit voltage (V_OC) and power conversion efficiency (PCE) values of 17.80 mA/cm², 530 mV and 3.25 %, respectively. The corresponding photoelectrode according to the results of Surface morphology analyses is still suitable for loading other quantum dots, because there are still large pores on the surface. The CdSe QDs were loaded using the Chemical Bath Deposition (CBD) technique at various times from 6 to 15 min' coverage of TiO₂ NPs/CdSe_0.3S_0.7 photoanode. The optimal thickness of the CdSe layer causes its energy levels to be aligned with the other layers and allowing photogenerated carriers to move between bands with a strong driving force before recombination. The cell with the TiO₂NPs/CdSe_0.3S_0.7(5 cycles)/CdSe(12min)/ZnS photoelectrode has the highest J_SC, V_OC and PCE values of 24.70 mA/cm², 580 mV and 6.25 %, respectively. The efficiency increased by 92 % compared to the reference cell, which only included CdSe0.3S0.7 QDs, and the IPCE and APCE curves had higher intensities and spanned a wider range of visible wavelengths. These changes are the result of enhanced light harvesting efficiency.

碲化镉0.3S0.7/碲化镉量子点敏化太阳能电池具有很高的光收集效率，是提高光电效率的理想选择。本研究采用连续离子层吸附和反应（SILAR）方法，将 CdSe0.3S0.7 卤化物量子点吸附到 TiO2 NPs 介孔薄膜上，变化周期为 1 到 7 个周期。当改变 CdSe0.3S0.7 量子点的厚度时，具有 TiO2 NPs/CdSe0.3S0.7(5c)/ZnS 光阳极的量子点敏化太阳能电池显示出更高的短路电流密度 (JSC)、开路电压 (VOC) 和功率转换效率 (PCE) 值，分别为 17.80 mA/cm2、530 mV 和 3.25 %。根据表面形貌分析的结果，相应的光电极仍然适合装载其他量子点，因为其表面仍然存在较大的孔隙。采用化学浴沉积（CBD）技术，在 TiO2 NPs/CdSe0.3S0.7 光阳极覆盖 6 到 15 分钟的不同时间内装载 CdSe QDs。硒化镉层的最佳厚度使其能级与其他层对齐，从而使光生载流子在重组前以强大的驱动力在带间移动。采用 TiO2NPs/CdSe0.3S0.7(5 个周期)/CdSe(12 分钟)/ZnS 光电极的电池具有最高的 JSC、VOC 和 PCE 值，分别为 24.70 mA/cm2、580 mV 和 6.25 %。与只包含 CdSe0.3S0.7 QD 的参考电池相比，效率提高了 92%，而且 IPCE 和 APCE 曲线的强度更高，可见光波长范围更广。这些变化是光收集效率提高的结果。

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引用次数: 0

Dual-functional high-crystalline 3D core-shell hexagonal tubular sulfur-doped carbon nitride for enhanced photocatalytic H2 production and simultaneously pollutants degradation 双功能高结晶三维核壳六角管状掺硫氮化碳，用于增强光催化制取 H2 的能力并同时降解污染物

IF 3.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Solid State Sciences

Pub Date : 2024-11-13 DOI: 10.1016/j.solidstatesciences.2024.107757

Jiachun Wu, Huixia Li, Yanjuan Cui

The use of semiconductor photocatalytic technology for water splitting to produce H₂ and degrade pollutants is a mild approach for clean energy conversion and environmental water purification. However, the rational design of photocatalysts with high carrier mobility remains a challenge. Herein, high-crystalline 3D core-shell hollow porous hexagonal tubular sulfur-doped carbon nitride (S-TCN) was synthesized through a simple and environmentally friendly supramolecular self-assembly strategy combined with a “salt-sealing” technique. This unique 3D structure facilitates the utilization of incident light, increases the active reaction sites, and improves interfacial mass transfer. The “salt-sealing” technique effectively enhances its crystallinity, while sulfur doping modification reduces the band gap and promotes separation and transfer of photogenerated carriers. Depend on the synergistic effect of morphology modulation, elemental doping, and high crystallinity, S-TCN exhibits significantly enhanced photoelectric conversion efficiency. It not only shows excellent performance for photocatalytic H₂ production in pure water, but also rapidly degrades pollutants while maintaining H₂ production activity in wastewater. The development of this dual-functional photocatalytic material holds important guiding significance for expanding the efficient application of polymer semiconductors.

利用半导体光催化技术进行水分离以产生 H2 和降解污染物，是一种温和的清洁能源转换和环境水净化方法。然而，如何合理设计具有高载流子迁移率的光催化剂仍是一项挑战。本文通过一种简单、环保的超分子自组装策略，结合 "盐封 "技术，合成了高晶三维核壳空心多孔六角管状掺硫氮化碳（S-TCN）。这种独特的三维结构有利于入射光的利用，增加了活性反应位点，并改善了界面传质。盐封 "技术有效地提高了其结晶度，而硫掺杂改性则降低了带隙，促进了光生载流子的分离和转移。在形貌调制、元素掺杂和高结晶度的协同作用下，S-TCN 的光电转换效率显著提高。它不仅在纯水光催化制取 H2 方面表现出色，而且还能在废水中快速降解污染物，同时保持制取 H2 的活性。这种双功能光催化材料的开发对于拓展聚合物半导体的高效应用具有重要的指导意义。

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引用次数: 0

Magnetocrystalline anisotropy and giant spontaneous magnetostriction in iron selenide Fe3Se4 studied on single crystals 在单晶体上研究硒化铁 Fe3Se4 的磁晶各向异性和巨大自发磁致伸缩性

IF 3.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Solid State Sciences

Pub Date : 2024-11-09 DOI: 10.1016/j.solidstatesciences.2024.107756

V.A. Komarova , V.A. Kazantsev , S.N. Mozgovykh , A.S. Volegov , N.V. Selezneva , N.V. Baranov

Using the modified Bridgman method, a single-crystalline sample of iron selenide Fe₃Se₄ was grown and its magnetization and thermal expansion behavior was studied along different crystallographic directions. In a ferrimagnetically ordered state below T_N = 345 K, the magnetization curves show that the magnetic moments do not lie strictly in the plane perpendicular to the c axis. The magnetocrystalline anisotropy constants, determined from the M(H) dependences along and across to the c axis, are K₁ = −3.9⋅10⁷ erg/cm³, K₂ = 5.0⋅10⁶ erg/cm³ at 4 K. Magnetic ordering in Fe₃Se₄ upon cooling below T_N is accompanied by anisotropic deformations of the crystal lattice: expansion along the c axis and compression across the c axis. Spontaneous volume magnetostriction is positive and reaches a giant value of about 1.2⋅10⁻² at 80 K. The pressure derivative of the Néel temperature is estimated using the Ehrenfest ratio as of dT_N/dp ≈ − 2.1 K/kbar. The results obtained show that the properties of Fe₃Se₄ are strongly influenced by magnetoelastic interactions.

利用改进的布里奇曼方法，制备了硒化铁 Fe3Se4 的单晶样品，并沿不同的晶体学方向研究了其磁化和热膨胀行为。在 TN = 345 K 以下的铁磁有序态中，磁化曲线显示磁矩并不严格位于垂直于 c 轴的平面内。根据沿 c 轴和横 c 轴的 M(H) 相关性确定的磁晶各向异性常数在 4 K 时为 K1 = -3.9⋅107 erg/cm3，K2 = 5.0⋅106 erg/cm3。Fe3Se4 中的磁有序性在冷却到 TN 以下时伴随着晶格的各向异性变形：沿 c 轴膨胀和跨 c 轴压缩。自发体积磁致伸缩为正值，在 80 K 时达到约 1.2⋅10-2 的巨值。内耳温度的压力导数是利用艾伦费斯特比率估算的，即 dTN/dp ≈ - 2.1 K/kbar。所得结果表明，Fe3Se4 的特性受到磁弹性相互作用的强烈影响。

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引用次数: 0

In situ synthesis of metal-organic frameworks on sulfonated cellulose nanofibrils 在磺化纤维素纳米纤维上原位合成金属有机框架

IF 3.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Solid State Sciences

Pub Date : 2024-11-09 DOI: 10.1016/j.solidstatesciences.2024.107755

Kailong Zhang , William Hutcherson , Neal D. Evans , Thomas Elder , Charles M. Garner , Mi Li

The intrinsic fragility and inferior processibility of metal-organic frameworks (MOFs) particles often restrict their functional application despite their high surface area and porous structure. We investigated the feasibility of sulfonated cellulose nanofibrils (SCNF) as a biopolymer template to hybridize MOFs. SCNF was synthesized through periodate oxidation followed by bisulfite sulfonation. The sulfonate groups increased electronegativity and enhanced the dispersibility of the cellulose fibers. More importantly, the negatively charged sulfonates could serve as anchors for metal ions to initiate the in situ growth of MOFs along the surface of cellulose fibers. We have achieved the synthesis of three types of SCNF/MOF hybrids, namely, SCNF/ZIF-8, SCNF/ZIF-67, and SCNF/HKUST-1. These hybrids can be formed as free-standing aerogels, exhibiting remarkably high surface areas and flexibility for applications. The assessment of the adsorptive efficiency of the SCNF/ZIF-8 hybrid indicates that the hybrid material exhibited a notably higher adsorption capacity for methylene blue versus the SCNF control. DFT calculation provides further insights into the underlying adsorption mechanisms, revealing that the sulfonates on the SCNF and the nitrogen atoms in the ZIF-8 ligands primarily contributed to the affinity for methylene blue. SCNF offers a versatile and robust biopolymer substrate for templating a wide array of MOFs with promising applications as adsorbents and beyond.

尽管金属有机框架（MOFs）颗粒具有高比表面积和多孔结构，但其固有的脆弱性和较差的可加工性往往限制了其功能性应用。我们研究了磺化纤维素纳米纤维（SCNF）作为生物聚合物模板与 MOFs 杂交的可行性。SCNF 是通过高碘酸氧化法合成的，然后进行亚硫酸氢盐磺化。磺酸盐基团增加了电负性，提高了纤维素纤维的分散性。更重要的是，带负电荷的磺酸盐可以作为金属离子的锚定物，启动 MOFs 沿纤维素纤维表面的原位生长。我们已经合成了三种 SCNF/MOF 混合物，即 SCNF/ZIF-8、SCNF/ZIF-67 和 SCNF/HKUST-1。这些混合物可以形成独立的气凝胶，具有显著的高比表面积和应用灵活性。对 SCNF/ZIF-8 混合物吸附效率的评估表明，与 SCNF 对照组相比，混合物材料对亚甲基蓝的吸附能力明显更高。DFT 计算进一步揭示了潜在的吸附机制，发现 SCNF 上的磺酸盐和 ZIF-8 配体中的氮原子是亚甲基蓝亲和力的主要来源。SCNF 提供了一种多功能、坚固耐用的生物聚合物基质，可用于模板化各种 MOFs，在吸附剂及其他方面具有广阔的应用前景。

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引用次数: 0