Materials Research Bulletin最新文献_第7页

Redox active cobalt based bi-linker metal organic frameworks derived from 5-sulfoisopthalic acid and 4,4-bipyridine for supercapacitor 由 5-磺基间苯二甲酸和 4,4-联吡啶衍生的氧化还原活性钴基双连接金属有机框架用于超级电容器

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin

Pub Date : 2024-10-01 DOI: 10.1016/j.materresbull.2024.113123

Javed Hussain Shah , Muhammad Shahbaz , Shahzad Sharif , Ghulam Ullah , Sundas Shahzad , Khurram Shahzad Munawar , Onur Şahin , Kareem Yusuf , Hijaz Ahmad

In this research study, we have synthesized, characterized and extensively compared the electrochemical characteristics of two materials derived from 5-sulphoisophtalic acid, 4,4-bipyridine and cobalt metal using sonochemical method. Cobalt-bipyridine complex with 5-SIP in lattice structure (RG-41) showed predominant capacitive behavior whereas Co-SIP-Bpy MOF (RG-42) exhibited significant pseudocapacitive attributes due to the presence of coordination linkage responsible for the electron transfer. Due to the effective electrochemical properties of RG-42, we implemented it practically by fabricating a hybrid device with outstanding electrochemical features, demonstrating impressive 92 % cyclic stability with energy density and power density of 51.41 Wh/kg and 800 W/kg at 1 A/g, respectively. Dunn's method was employed to obtain capacitive-diffusive contributions for both half-electrochemical cells as well as hybrid device. These results underscored the potential of RG-42 as a competitive electrode material for future energy storage applications.

在这项研究中，我们采用声化学方法合成、表征并广泛比较了由 5-磺基异酞酸、4,4-联吡啶和金属钴衍生的两种材料的电化学特性。晶格结构中含有 5-SIP 的钴-联吡啶复合物（RG-41）显示出主要的电容行为，而 Co-SIP-Bpy MOF（RG-42）则由于存在负责电子传递的配位连接而表现出显著的假电容特性。由于 RG-42 具有有效的电化学特性，我们将其付诸实践，制造出了一种具有出色电化学特性的混合器件，其循环稳定性高达 92%，能量密度和功率密度在 1 A/g 时分别为 51.41 Wh/kg 和 800 W/kg。利用邓恩方法获得了半电化学电池和混合装置的电容扩散贡献。这些结果凸显了 RG-42 作为一种具有竞争力的电极材料在未来储能应用中的潜力。

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引用次数: 0

Cation substitution strategy realizing controllable spectral shape and multiple applications in a novel blue-cyan emitting KBaScSi2O7:Bi3+ phosphor 阳离子置换策略在新型蓝-绀发光 KBaScSi2O7:Bi3+ 荧光粉中实现可控光谱形状和多种应用

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin

Pub Date : 2024-10-01 DOI: 10.1016/j.materresbull.2024.113125

Minliang Deng , Yixin Sun , Yining Wang , Xiaole Xing , Mengmeng Shang

Controlling the emission spectrum shape and the site occupancy tendency are of great significance for designing full-visible-spectrum phosphors in pc-wLEDs application. Herein, a novel blue-cyan emitting KBaScSi₂O₇ (KBSS):Bi³⁺ phosphor is reported. Under excitation at 331 nm UV light, the KBSS:0.04Bi³⁺ exhibits a broadband blue-cyan emission, including a primary peak at 409 nm and a shoulder peak at 493 nm. The two emission peaks exhibit different thermal quenching behaviors because of the existence of defects. The implementation of Y³⁺, Lu³⁺ and Cs⁺ substitutions has successfully enhanced the luminescence intensity of the samples by factors of 1.4, 2, and 2.3, respectively, and the goal of controlling the spectral shape and site occupancy tendency is achieved. Their applications in luminescence thermometers and wLEDs are evaluated. The S_r (relative sensitivity) and S_a (absolute sensitivity) of phosphor are 0.37 % K^-1 and 0.20 % K^-1, respectively and the as-fabricated white LED device shows superior luminescence performance (CCT = 5311 K, Ra = 90).

控制发射光谱形状和位点占位趋势对于设计应用于 pc-wLED 的全可见光谱荧光粉具有重要意义。本文报告了一种新型蓝青色发光 KBaScSi2O7 (KBSS)：Bi3+ 荧光粉。在 331 nm 紫外光的激发下，KBSS:0.04Bi3+ 发出宽带蓝青光，包括 409 nm 处的主峰和 493 nm 处的肩峰。由于存在缺陷，这两个发射峰表现出不同的热淬灭行为。Y3+、Lu3+ 和 Cs+ 取代成功地将样品的发光强度分别提高了 1.4、2 和 2.3 倍，实现了控制光谱形状和位点占有趋势的目标。评估了它们在发光温度计和 wLED 中的应用。荧光粉的 Sr（相对灵敏度）和 Sa（绝对灵敏度）分别为 0.37 % K-1 和 0.20 % K-1，而制成的白光 LED 器件显示出卓越的发光性能（CCT = 5311 K，Ra = 90）。

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引用次数: 0

Construction of heterojunction MXene/RGO/CoFe-LDH for electromagnetic wave absorption 构建用于吸收电磁波的异质结 MXene/RGO/CoFe-LDH

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin

Pub Date : 2024-10-01 DOI: 10.1016/j.materresbull.2024.113121

Guoxin Ding , Chenfeng Sun , Meiyi Wang , Yuexiang Hu , Guojun Cheng , Jun Liu

The 2D nanomaterial has been widely used in the field of electromagnetic wave absorption because of its high specific surface area and special electrical properties. In this work, three 2D materials were integrated to form a unique ternary composite with Ti₃C₂T_x MXene as the substrate, RGO as the intercalator with additional components, and CoFe-LDH loaded on the MXene/RGO surface. The interfacial and dipole polarizations were notably enhanced due to the abundant formation of heterogeneous interfaces between the three 2D materials and their corresponding abundant functional groups and defects, and the space between the 2D lamellae enabled multiple reflections of electromagnetic waves. Compared with pure MXene, the MXene/RGO/CoFe-LDH composites exhibited excellent electromagnetic wave absorption performance due to the synergy of multiple loss mechanisms, resulting in the best reflection loss value of −58.9 dB at 13.12 GHz.

二维纳米材料因其高比表面积和特殊的电学特性而被广泛应用于电磁波吸收领域。在这项工作中，以 Ti3C2Tx MXene 为基底，RGO 为插层剂并添加其他成分，CoFe-LDH 负载在 MXene/RGO 表面，三种二维材料被整合成一种独特的三元复合材料。由于三种二维材料之间形成了丰富的异质界面以及相应的丰富官能团和缺陷，界面极化和偶极极化显著增强，二维薄片之间的空间使电磁波能够多次反射。与纯 MXene 相比，由于多种损耗机制的协同作用，MXene/RGO/CoFe-LDH 复合材料表现出优异的电磁波吸收性能，在 13.12 GHz 频率下的最佳反射损耗值为 -58.9 dB。

引用次数: 0

Development of Z-scheme BiVO4/g-C3N4/rGO heterojunction nanocomposite for enhanced photocatalytic degradation and antibacterial activity 开发 Z 型 BiVO4/g-C3N4/rGO 异质结纳米复合材料，增强光催化降解和抗菌活性

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin

Pub Date : 2024-09-30 DOI: 10.1016/j.materresbull.2024.113119

Nicharee Akechatree , Ranjith Rajendran , Thammasak Rojviroon , Priyadharsan Arumugam , Vasanthakumar Vasudevan , Sanya Sirivithayapakorn , Arul Dhayalan , Pongsakorn Wongpipun , Natacha Phetyim , Orawan Rojviroon

In this study, we synthesized a novel BiVO₄/g-C₃N₄/rGO (BGR) heterojunction photocatalyst using the hydrothermal method. The synthesized catalysts were characterized through X-ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), Scanning Electron Microscopy with Energy Dispersive X-ray Spectroscopy (SEM-EDX), Transmission Electron Microscopy (TEM), and Ultraviolet-Visible Diffuse Reflectance Spectroscopy (UV-DRS) to analyze their structural, morphological, and optical properties. The hybrid BGR nanocomposite displayed remarkable absorption characteristics, photocatalytic activity, and notable stability. Photocatalytic degradation performance was evaluated against methylene blue (MB) and indigo carmine (IC) dyes. The BGR ternary hybrid nanocomposites demonstrated significant photocatalytic degradation efficiency, achieving removal rates of 95.6 % for MB and 97.5 % for IC dyes within 120 min. The improved photocatalytic efficiency of the ternary photocatalyst is attributed to superior electron-hole pair separation and the formation of the heterojunction structure. The BGR nanocomposite exhibited excellent recyclability, maintaining its activity and crystalline characteristics over five photodegradation cycles. Additionally, the antibacterial activity of the BGR nanocomposites against Staphylococcus aureus,Escherichia coli, Klebsiella pneumoniae, and Pseudomonas aeruginosa was evaluated under UV–visible light exposure. This study provides insights for designing efficient visible-light-driven photocatalysts for environmental remediation purposes.

在本研究中，我们采用水热法合成了一种新型 BiVO4/g-C3N4/rGO (BGR) 异质结光催化剂。通过 X 射线衍射 (XRD)、X 射线光电子能谱 (XPS)、扫描电子显微镜与能量色散 X 射线能谱 (SEM-EDX)、透射电子显微镜 (TEM) 和紫外-可见漫反射光谱 (UV-DRS) 对合成的催化剂进行了表征，以分析其结构、形态和光学特性。混合 BGR 纳米复合材料具有显著的吸收特性、光催化活性和稳定性。对亚甲基蓝（MB）和靛胭脂红（IC）染料的光催化降解性能进行了评估。BGR 三元杂化纳米复合材料具有显著的光催化降解效率，在 120 分钟内对 MB 和 IC 染料的去除率分别达到 95.6% 和 97.5%。三元光催化剂光催化效率的提高归功于优异的电子-空穴对分离和异质结结构的形成。BGR 纳米复合材料具有出色的可回收性，在五个光降解周期内都能保持其活性和结晶特性。此外，还评估了 BGR 纳米复合材料在紫外可见光照射下对金黄色葡萄球菌、大肠杆菌、肺炎克雷伯氏菌和绿脓杆菌的抗菌活性。这项研究为设计用于环境修复的高效可见光驱动光催化剂提供了启示。

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引用次数: 0

Design plasmonic nanostructure of silicon dioxide and titanium dioxide loaded on a nano surface for clean water production through photocatalysis and electrochemical techniques 设计纳米表面负载二氧化硅和二氧化钛的质子纳米结构，通过光催化和电化学技术生产洁净水

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin

Pub Date : 2024-09-30 DOI: 10.1016/j.materresbull.2024.113120

Rasha M. El-Gohary , Nagi M. El-Shafai , Ibrahim M. El-Mehasseb , Heba I. Ghamry , Mohammad Y. Alshahrani , Amr M. Beltagi

The work is targeted to rebuild the framework of a nanocatalyst (NCat) that depends on the n/p-type heterojunction through the plasmonic structure of reduced graphene oxide (rGO), silicon oxide nanoparticles (SiO₂ NPs), polyvinyl alcohol (PVA NPs), and titanium dioxide (TiO₂ NPs). The removal of medical and organic contaminants occurs via photocatalysis operation which follows through the electrochemical technique and UV-spectrophotometer under visible light with nanocatalyst (rGO@SiO₂@PVA@TiO₂) for clean water and a safe medical environment. The Z-Scheme mechanism explains the development of electron maps in fabricated nanocatalyst engineering to increase the efficiency of the photocatalytic activity. The high activity of the NCat appeared, after 160 min, and the photocatalytic efficiency for methylene blue (MB), methyl orange (MO), rhodamine B (RhB), moxifloxacin (MFX), and colchicine, was 90 %, 76 %, 88 %, 84 %, and 91 % respectively. The stability of NCat was confirmed via the recyclability process, with the efficiency at 58 % after the fifth cycle. The high stability of NCat was proved by the electrochemical technique performed after 100 cycles. The safety of the NCat for the generation of clean water was highlighted by the cytotoxicity test using normal mouse liver cells. It is suggested to use the new NCat design because of its distinctive optical characteristics, which make it a viable candidate for use as a revolutionary nanomaterial with high efficiency and safety for clean water and removal of medical contaminants.

这项工作的目标是通过还原氧化石墨烯（rGO）、氧化硅纳米颗粒（SiO2 NPs）、聚乙烯醇（PVA NPs）和二氧化钛（TiO2 NPs）的质子结构，重建依赖于 n/p 型异质结的纳米催化剂（NCat）框架。纳米催化剂（rGO@SiO2@PVA@TiO2）在可见光下通过电化学技术和紫外分光光度计进行光催化操作，去除医用污染物和有机污染物，从而获得清洁的水和安全的医疗环境。Z-Scheme 机制解释了电子地图在纳米催化剂制造工程中的发展，从而提高了光催化活性的效率。160 分钟后，NCat 出现了高活性，对亚甲基蓝（MB）、甲基橙（MO）、罗丹明 B（RhB）、莫西沙星（MFX）和秋水仙碱的光催化效率分别为 90%、76%、88%、84% 和 91%。NCat 的稳定性通过可回收过程得到了证实，第五次循环后的效率为 58%。经过 100 次循环后，电化学技术证明了 NCat 的高稳定性。使用正常小鼠肝细胞进行的细胞毒性测试强调了 NCat 在生成清洁水方面的安全性。由于新型 NCat 设计具有独特的光学特性，因此建议将其作为一种高效、安全的革命性纳米材料，用于洁净水和去除医疗污染物。

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引用次数: 0

Unravelling charge carrier dynamics for enhancement of photocatalytic performance in Pd/MoS2 nanocomposites for water remediation of real-world pollutants 揭示电荷载流子动力学，提高 Pd/MoS2 纳米复合材料的光催化性能，用于现实世界污染物的水处理

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin

Pub Date : 2024-09-30 DOI: 10.1016/j.materresbull.2024.113122

Ritu Kumari, Rakesh Kumar

In this study, Pd/MoS₂ nanocomposites were successfully synthesized incorporating Pd nanoparticles into three-dimensional (3D) flower-like MoS₂ nanostructures. The controlled introduction of Pd was aimed to optimize the photocatalytic performance of the resulting nanocomposites, which exhibited exceptional efficiency in degrading various organic pollutants and antibiotic tetracycline (TC) under simulated solar light irradiation. The nanocomposites with an optimized Pd concentration of 2.5 % demonstrated outstanding photocatalytic efficiency, achieving the degradation of Rhodamine B (RhB), Methylene blue (MB), TC by 98 %, 98 %, and 96 %, respectively, with specific interval of 40, 30 and 60 min. The reaction rate constant of the Pd/MoS₂ nanocomposites was measured to be 0.7798 min⁻¹ using pseudo first-order rate kinetics. The value is about 19 times higher than that of pure MoS₂ (0.00414 min⁻¹) for degradation of RhB. The improved photocatalytic performance of these nanocomposites can be attributed to several factors. Firstly, the incorporation of Pd nanoparticles substantially enhanced their light absorption capabilities, leading to an overall increase in photocatalytic efficiency. Moreover, the presence of Pd contributed to a large surface area, further enhancing the nanocomposite's photocatalytic potential. Importantly, the formation of a built-in electric field at Pd/MoS₂ interface facilitated the efficient separation of the electron-hole pairs, extending the life time of these photoinduced charge carriers. This study offers valuable insights into development of MoS₂-based photocatalyst, which hold significant promise for addressing water pollution challenges and making substantial contributions to the field of water purification and environmental remediation.

本研究成功合成了钯/MoS2 纳米复合材料，在三维（3D）花朵状 MoS2 纳米结构中加入了钯纳米颗粒。在模拟太阳光照射下，这些纳米复合材料在降解各种有机污染物和抗生素四环素（TC）方面表现出卓越的效率。优化钯浓度为 2.5 % 的纳米复合材料具有出色的光催化效率，在 40、30 和 60 分钟的特定时间间隔内，对罗丹明 B (RhB)、亚甲蓝 (MB) 和四环素 (TC) 的降解率分别为 98 %、98 % 和 96 %。利用伪一阶速率动力学测得 Pd/MoS2 纳米复合材料的反应速率常数为 0.7798 min-1。在降解 RhB 时，该值比纯 MoS2（0.00414 min-1）高出约 19 倍。这些纳米复合材料光催化性能的提高可归因于几个因素。首先，Pd 纳米颗粒的加入大大增强了它们的光吸收能力，从而提高了光催化效率。此外，钯的存在有助于形成大的表面积，进一步提高纳米复合材料的光催化潜力。重要的是，Pd/MoS2 界面形成的内置电场促进了电子-空穴对的有效分离，延长了这些光诱导电荷载流子的寿命。这项研究为开发基于 MoS2 的光催化剂提供了宝贵的见解，这种催化剂在应对水污染挑战方面前景广阔，可为水净化和环境修复领域做出重大贡献。

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引用次数: 0

Ratiometric optical temperature sensing properties based on up-conversion luminescence of novel NaLaTi2O6:Yb3+,Er3+/Ho3+ phosphors 基于新型 NaLaTi2O6:Yb3+,Er3+/Ho3+ 荧光的上转换发光的比率光学温度传感特性

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin

Pub Date : 2024-09-29 DOI: 10.1016/j.materresbull.2024.113117

Kai Li , Daiman Zhu

To satisfy the increasing necessity of contactless optical thermometry, utilizing both thermally coupled (TCLs) or non-thermally-coupled (NTCLs) energy levels of rare earth ions in novel phosphors has significant potential for devising the optical thermometers with high temperature sensitivity. Herein, a sequence of novel Yb³⁺,Er³⁺/Ho³⁺ doped NaLaTi₂O₆ (NLTO) phosphors were sintered using a high-temperature solid-state reaction approach. Structure, phase component and luminescence performance were identified in detail. Upon 980 nm near-infrared (NIR) excitation, the obtained materials presented typical Er³⁺/Ho³⁺ characteristic emission wavelengths in visible region, which include two green emission bands around 522 and 543 nm, as well as a weaker red band around 661 nm for Er³⁺ doped NLTO, a green emission band around 545 nm and a red band around 657 nm for Ho³⁺ doped NLTO. Besides, a unusual emission band around 757 nm of Ho³⁺ in visible edge region was also clearly found. The temperature sensing properties of representative NLTO:Yb³⁺,Er³⁺/Ho³⁺ samples were assessed based on the fluorescence intensity ratio (FIR) technique of TCLs or NTCLs energy levels. The maximal absolute sensitivity (S_a) and relative sensitivity (S_r) were determined to be 0.0374 K^-1 (293 K) and 0.970% K^-1 (293 K) by taking the FIR of NTCLs ²H_11/2→⁴I_15/2 and ⁴F_9/2→⁴I_15/2 transitions in NLTO:Yb³⁺,Er³⁺. Simultaneously, the maximal S_a and S_r were 0.0306 K^-1 (573 K) and 0.776% K^-1 (373 K) using the FIR of NTCLs ⁵F₅→⁵I₈ and ⁵F₄,⁵S₂→⁵I₇ transitions in NLTO:Yb³⁺,Ho³⁺. Consequently, the temperature sensitivities above can be compared to reported results, which indicate that as-prepared materials have a promising application in optical temperature sensors field.

为了满足日益增长的非接触式光学测温的需要，利用新型荧光粉中稀土离子的热耦合（TCLs）或非热耦合（NTCLs）能级设计具有高温度灵敏度的光学温度计具有巨大的潜力。本文采用高温固态反应方法烧结了一系列新型掺杂 Yb3+、Er3+/Ho3+ 的 NaLaTi2O6（NLTO）荧光粉。对其结构、相组成和发光性能进行了详细鉴定。在 980 纳米近红外（NIR）激发下，所获得的材料在可见光区域呈现出典型的 Er3+/Ho3+ 特征发射波长，其中包括掺杂 Er3+ 的 NLTO 在 522 纳米和 543 纳米附近的两条绿色发射带，以及 661 纳米附近较弱的红色发射带；掺杂 Ho3+ 的 NLTO 在 545 纳米附近的一条绿色发射带和 657 纳米附近的一条红色发射带。此外，还清楚地发现在可见光边缘区域，Ho3+ 在 757 nm 附近有一个不寻常的发射带。根据 TCLs 或 NTCLs 能级的荧光强度比（FIR）技术，对具有代表性的 NLTO:Yb3+,Er3+/Ho3+ 样品的温度传感特性进行了评估。通过计算 NLTO:Yb3+,Er3+ 中 NTCLs 2H11/2→4I15/2 和 4F9/2→4I15/2 转换的荧光强度比，确定最大绝对灵敏度 (Sa) 和相对灵敏度 (Sr) 分别为 0.0374 K-1 (293 K) 和 0.970% K-1 (293 K)。同时，利用 NLTO:Yb3+,Ho3+ 中 NTCLs 5F5→5I8 和 5F4,5S2→5I7 转变的 FIR，最大 Sa 和 Sr 分别为 0.0306 K-1 (573 K) 和 0.776% K-1 (373 K)。因此，上述温度灵敏度可与已报道的结果进行比较，这表明制备的材料在光学温度传感器领域具有广阔的应用前景。

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引用次数: 0

High performance self-powered photodetection and X-ray detection realized by CH3NH3PbI3 single crystal with planar asymmetric Schottky structure 具有平面不对称肖特基结构的 CH3NH3PbI3 单晶实现了高性能自供电光电探测和 X 射线探测

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin

Pub Date : 2024-09-29 DOI: 10.1016/j.materresbull.2024.113115

Ji Yu , Yinxian Luo , Ning Tian , Lin Li , Wenzhu Tan , Ruoning Zheng

Organic-inorganic hybrid perovskite CH₃NH₃PbI₃ (MAPbI₃) single crystals (SCs) have been widely investigated in photodetection and X-ray detection. However, external electric-field-driven ion migration seriously affect the stability of MAPbI₃ SCs based optoelectronic devices. Self-powered device can operate without any external power supply, which is suitable for mitigating the ion migration of MAPbI₃ SCs. To realize self-powered MAPbI₃ SC based photodetector and X-ray detector, an asymmetric Au/CH₃NH₃PbI₃ SC/Au planar Schottky structure is employed in this work. At 0 V, the self-powered photodetector can achieve the responsivity of 11.1 mA/W at the wavelength of 795 nm, and the sensitivity of the self-powered X-ray detector can reach 477.1 μC Gy^-1cm^-2 with the detection limit of as low as 140.3 nGy s^-1. Moreover, the self-powered optoelectronic device exhibits good stability in both photodetection and X-ray detection. Most importantly, high-quality near-infrared bioimaging and X-ray imaging are successfully realized by the above self-powered optoelectronic device.

有机-无机杂化包晶 CH3NH3PbI3（MAPbI3）单晶（SCs）已在光电探测和 X 射线探测领域得到广泛研究。然而，外部电场驱动的离子迁移严重影响了基于 MAPbI3 SCs 的光电器件的稳定性。自供电器件可以在没有任何外部电源的情况下工作，适用于减缓 MAPbI3 SCs 的离子迁移。为了实现基于 MAPbI3 SC 的自供电光电探测器和 X 射线探测器，本研究采用了非对称金/CH3NH3PbI3 SC/Au 平面肖特基结构。在 0 V 电压下，自供电光电探测器在波长为 795 nm 时的响应率可达 11.1 mA/W，而自供电 X 射线探测器的灵敏度可达 477.1 μC Gy-1cm-2，探测极限低至 140.3 nGy s-1。此外，自供电光电装置在光探测和 X 射线探测方面都表现出良好的稳定性。最重要的是，上述自供电光电器件成功实现了高质量的近红外生物成像和 X 射线成像。

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引用次数: 0

Fabrication of sandwich nanostructured substrates with Au@Ag NCs/Graphene/AgMP for ultrasensitive SERS detection 利用 Au@Ag NCs/Graphene/AgMP 制作夹层纳米结构基底，用于超灵敏 SERS 检测

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin

Pub Date : 2024-09-29 DOI: 10.1016/j.materresbull.2024.113107

Jianxia Qi , Wanting Zhou , Chengyuan Yang , Wen Liu , Chang Guan , Chengyun Zhang , Qingyan Han , Wei Gao , Lipeng Zhu , Jun Dong

This paper presents the design of a bottom-up "sandwich" configuration substrate via electrostatic self-assembly. A silver microplate (AgMP) serves as the stable structural base, onto which monolayer graphene is wet-transferred. Au@Ag nanocubes (Au@Ag NCs) are then assembled on the upper layer through liquid-liquid three-phase self-assembly, forming a Au@AgNCs/G/AgMP “sandwich” substrate. The combination of electromagnetic enhancement from noble metal nanoparticles and chemical enhancement from graphene synergistically amplifies the signal of detected molecules, leading to significant Surface-Enhanced Raman Scattering (SERS) enhancement. Experimental results demonstrate that this substrate can detect Rhodamine 6 G (R6G) at concentrations as low as 10^–12 M and Crystal Violet (CV) at 10^–9 M. Moreover, the substrate can detect Aspartame (APM) at concentrations as low as 0.0625 g/L, well below the typical daily intake levels for humans. These findings indicate that the substrate exhibits excellent SERS performance and holds significant potential for broad applications.

本文介绍了通过静电自组装设计自下而上的 "三明治 "结构基底。银微孔板（AgMP）是稳定的结构基底，单层石墨烯被湿法转移到银微孔板上。然后通过液-液三相自组装将 Au@Ag 纳米立方体（Au@Ag NCs）组装到上层，形成 Au@AgNCs/G/AgMP "三明治 "基底。贵金属纳米粒子的电磁增强和石墨烯的化学增强相结合，协同放大了被检测分子的信号，从而显著增强了表面增强拉曼散射（SERS）。实验结果表明，这种基底可以检测浓度低至 10-12 M 的罗丹明 6 G (R6G)和 10-9 M 的水晶紫 (CV)。此外，这种基底还可以检测浓度低至 0.0625 g/L 的阿斯巴甜 (APM)，远远低于人类的典型日摄入量。这些研究结果表明，这种基底具有优异的 SERS 性能，具有广泛的应用潜力。

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引用次数: 0

Flexible PVDF-Ba0.97Ca0.03TiO3 polymer-ceramic composite films for energy storage, biosensor, mechanosensor, and UV–visible light protection 用于能量存储、生物传感器、机械传感器和紫外线可见光防护的柔性 PVDF-Ba0.97Ca0.03TiO3 聚合物-陶瓷复合薄膜

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin

Pub Date : 2024-09-28 DOI: 10.1016/j.materresbull.2024.113116

P. Elorika , Sharmistha Anwar , Amritendu Roy , Shahid Anwar

Multifunctional piezoelectric devices, which can detect pressure, store electrostatic energy, block UV radiation, and generate electricity from body movements, are highly beneficial for enhancing individual well-being. To achieve these capabilities, polyvinylidene fluoride (PVDF) composite films with Ba_0.97Ca_0.03TiO₃ (BCT3) filler were prepared, varying the BCT3 content from 0 to 50 wt.%. The BCT3 ceramic, prepared using a modified solid-state reaction, exhibits a tetragonal phase at room temperature with a d₃₃ value of 105 pC/N. X-ray diffraction confirms composite formation. The beta phase ranges from 75 to 86.9 %. At 40 wt.% BCT3, the dielectric constant, energy density, and piezoelectric properties peak, yielding maximum W_rec and W_tot of 138.1 and 284.7 mJ/cm³ (@ 250 kV/cm), respectively. PVDF-BCT3-40 (40 wt.%) shows maximum voltage, current, and power density of 25 V, 26.8 nA, and 19.8 μW/cm³ under a 50 N load. Increasing BCT3 content enhances UV–visible absorbance, making the composites effective for light shielding.

多功能压电器件可以检测压力、存储静电能量、阻挡紫外线辐射并利用身体运动发电，对提高个人健康水平大有裨益。为了实现这些功能，我们制备了含有 Ba0.97Ca0.03TiO3（BCT3）填料的聚偏二氟乙烯（PVDF）复合薄膜，BCT3 的含量从 0 到 50 wt.%不等。采用改良固态反应制备的 BCT3 陶瓷在室温下呈四方相，d33 值为 105 pC/N。X 射线衍射证实了复合材料的形成。β相占 75% 到 86.9%。BCT3 的重量百分比为 40 时，介电常数、能量密度和压电特性达到峰值，最大 Wrec 和 Wtot 分别为 138.1 和 284.7 mJ/cm3（@ 250 kV/cm）。在 50 N 负载下，PVDF-BCT3-40（40 wt.%）的最大电压、电流和功率密度分别为 25 V、26.8 nA 和 19.8 μW/cm3。增加 BCT3 的含量可提高紫外线可见吸收率，使复合材料具有有效的光屏蔽作用。

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