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InGaN/GaN multi-quantum well LED array for short distance optical links 短距离光链路用InGaN/GaN多量子阱LED阵列
IF 6.7 3区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2026-02-06 DOI: 10.1039/d5nr04586j
Xueyao Lu, Xuming Gao, Xiaoxuan Wang, Yang Chen, Xin Li, Fan Shi, Fang Liu, Xu Wang, Feifei Qin, Yongjin Wang
Visible light communication is increasingly regarded as a pivotal complementary paradigm for emerging wireless infrastructures, while optical interconnects are widely acknowledged as a disruptive enabler of energy-efficient, ultra-dense data-center architectures. Based on this idea, we proposed an InGaN/GaN LED array for high-speed, short-distance optical links. By utilizing InGaN/GaN multi-quantum-wells (MQWs) devices and matrix electrode injection structures, the LED array (10×10) was fabricated for multi-channel communication under an on-off keying modulation scheme. Electroluminescence (EL), modulation bandwidth, and signal transmission properties of individual LED were thoroughly characterized. Experimental results demonstrate that the individual unit is about 200×200 μm in size, and it shows green emission peaked near 530 nm, achieving a -3 dB bandwidth in the region of 5.3 MHz to 13.7 MHz with a current region of 10 to 70 mA. The data rate can remain stable at 50 Mbps with bit error rate below 2×10-5, and can reach a limiting data rate exceeding 100 Mbps for driven current over 80 mA. We also confirm that these value are high enough to support video and audio transmission. Furthermore, as the LED array is designed in a row-common-ground configuration with individually addressable columns, the total data rate in a multiple-input multiple-output (MIMO) mode will theoretically exceed 500 Mbps. Our study reveals the promising potential of compact LED array for integrated optical links, with significant room remaining for improvement, particularly in reducing power consumption.
可见光通信越来越被视为新兴无线基础设施的关键补充范例,而光互连被广泛认为是节能、超密集数据中心架构的颠覆性推动者。基于这个想法,我们提出了一个用于高速、短距离光链路的InGaN/GaN LED阵列。利用InGaN/GaN多量子阱(mqw)器件和矩阵电极注入结构,制备了开关键控调制方案下的多通道通信LED阵列(10×10)。对单个LED的电致发光(EL)、调制带宽和信号传输特性进行了全面的表征。实验结果表明,单个单元的尺寸约为200×200 μm,在530 nm附近显示出绿色峰值,在5.3 MHz ~ 13.7 MHz范围内实现了-3 dB的带宽,电流范围为10 ~ 70 mA。数据速率可稳定在50 Mbps,误码率低于2×10-5,驱动电流超过80 mA时,数据速率可达到100 Mbps以上的极限。我们还确认这些值足够高,可以支持视频和音频传输。此外,由于LED阵列被设计成具有单独可寻址列的行共地配置,因此多输入多输出(MIMO)模式的总数据速率理论上将超过500 Mbps。我们的研究揭示了用于集成光链路的紧凑型LED阵列的巨大潜力,还有很大的改进空间,特别是在降低功耗方面。
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引用次数: 0
Novel chemical mechanical polishing assisted by photocatalysis and shear-thickening for a free surface blade of a Ti alloy using ceria nano-abrasives. 利用二氧化铈纳米磨料对钛合金自由表面叶片进行光催化和剪切增厚的新型化学机械抛光。
IF 5.1 3区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2026-02-06 DOI: 10.1039/d5nr05259a
Shuai Zhang, Zhenyu Zhang, Zhibin Yu, Junde Guo, Zhenghong Liu, Feng Tian, Yujie Chen, Xingqiao Deng, Xiaofei Yang

Titanium (Ti) alloys have low thermal conductivity, suffer from tool wear and deformation of workpieces and are difficult-to-machine metals. This contributes to surface roughness, Sa > 240 nm of Ti alloys after mechanical polishing with a low material removal rate (MRR). With the addition of assisting energy fields, the MRR is usually lower than 7 μm h-1. Nevertheless, there is a high demand to achieve Sa < 50 nm on a free surface blade to save energy and reduce the resistance of fluids. To address this challenge, novel photocatalytic shear-thickening chemical mechanical polishing (PSTCMP) was developed using a custom-made polisher. The new PSTCMP slurry contained ceria, corn starch, sodium bicarbonate and deionized water. After PSTCMP, the Sa and thickness of the damaged layer of a free surface blade of a Ti alloy decreased from 501.71 to 38.46 nm and from 634.79 to 7.83 nm, respectively, representing reductions of 92% and 99%. The MRR is 12.52 μm h-1. To the best of our knowledge, both the Sa and MRR are the best published to date for a Ti alloy blade with a free surface. PSTCMP mechanisms were interpreted using first-principles molecular dynamics, X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy. Hydroxyl radicals were generated under ultraviolet irradiation on ceria with a size of 4.2 nm, oxidizing the surface of the Ti alloy and forming Ti-OH and Ti-O groups. A Ce-O-Ti interface bridge was produced between Ti-OH and Ce-OH, induced by the hydrolysis of ceria. Our findings provide a new way to fabricate nanometer-scale surface roughness on a free surface blade of a Ti alloy with a high MRR.

钛(Ti)合金导热系数低,易受刀具磨损和工件变形的影响,是难以加工的金属。机械抛光后的钛合金表面粗糙度达到240 nm,材料去除率(MRR)较低。随着辅助能量场的加入,MRR通常低于7 μm -1。然而,为了节省能量和降低流体阻力,对自由表面叶片的Sa < 50 nm的要求很高。为了解决这一挑战,使用定制抛光剂开发了新型光催化剪切增厚化学机械抛光(PSTCMP)。新型PSTCMP浆料含有二氧化铈、玉米淀粉、碳酸氢钠和去离子水。经PSTCMP处理后,钛合金自由面叶片损伤层的Sa和厚度分别从501.71 nm和634.79 nm下降到38.46 nm和7.83 nm,分别下降了92%和99%。MRR为12.52 μm -1。据我们所知,Sa和MRR都是迄今为止发布的具有自由表面的钛合金叶片的最佳材料。利用第一性原理分子动力学、x射线光电子能谱和傅里叶变换红外光谱对PSTCMP机理进行了解释。在紫外照射下,在尺寸为4.2 nm的铈表面生成羟基自由基,使钛合金表面氧化形成Ti- oh和Ti- o基团。在氧化铈的水解作用下,在Ti-OH和Ce-OH之间形成了Ce-O-Ti界面桥。我们的发现为在高MRR的钛合金自由表面叶片上制造纳米级表面粗糙度提供了一种新的方法。
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引用次数: 0
Sliding ferroelectricity and ferroelectric–valley coupling in Janus RuXY (X, Y = Cl, Br, I) bilayers Janus RuXY (X, Y = Cl, Br, I)双分子层的滑动铁电和铁电-谷耦合
IF 6.7 3区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2026-02-06 DOI: 10.1039/d5nr04816h
Shuisheng Yi, Peiyao Chen, Yumin Liao, Xumin Chen, Dexuan Huo
Two-dimensional Janus transition-metal dihalides RuXY (X, Y = Cl, Br, I) constitute a class of van der Waals multiferroic materials with the coexistence of sliding ferroelectricity and interlayer antiferromagnetism. Here, we report the sliding ferroelectricity and ferroelectric-valley coupling in Janus RuXY bilayers based on first-principles calculations. The out-of-plane ferroelectric polarization, which originates from vertical charge transfer induced by broken mirror symmetry, can be reversed through interlayer sliding. The relative electronegativity of the halogens strongly determines the enhancements or reductions of the polarizations of Janus RuXY bilayers. In addition, the valley polarization and valley splitting at the K/K′ points in Janus RuXY bilayers are inverted upon ferroelectric switching due to interlayer sliding, demonstrating a potential ferroelectric—valley coupling mechanism—the regulation of the valley state by the sliding ferroelectric polarization. Furthermore, atomically projected band structures illustrate that Ru atoms dominate the valley behavior, while contributions from halogen atoms are negligible. The coexistence of low switching energy and strong ferroelectric-valley coupling makes Janus RuXY bilayers a promising platform for energy-efficient multiferroic and valleytronic devices.
二维Janus过渡金属二卤化物RuXY (X, Y = Cl, Br, I)是一类具有滑动铁电性和层间反铁磁性共存的范德华多铁性材料。本文报道了基于第一性原理计算的Janus RuXY双层中的滑动铁电和铁电-谷耦合。由破镜对称引起的垂直电荷转移引起的面外铁电极化可以通过层间滑动逆转。卤素的相对电负性强烈地决定了Janus RuXY双分子层极化的增强或减弱。此外,由于层间滑动,Janus RuXY双层中K/K′点的谷极化和谷分裂在铁电开关时发生反转,证明了一种潜在的铁电-谷耦合机制——滑动铁电极化对谷态的调节。此外,原子投影能带结构表明,钌原子主导了谷行为,而卤素原子的贡献可以忽略不计。低开关能量和强铁电-谷耦合的共存使Janus RuXY双层层成为一种有前途的高能效多铁和谷电子器件平台。
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引用次数: 0
Interplay of the interlayer distance and in-plane lattice relaxations in encapsulated twisted bilayers. 层间距离和面内晶格弛豫的相互作用。
IF 5.1 3区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2026-02-06 DOI: 10.1039/d5nr03757c
V V Enaldiev

Encapsulation protects functional layers, ensuring structural stability and improving the quality of assembled van der Waals heterostructures. Here, we develop a model that describes lattice relaxation in twisted bilayers accounting for encapsulation effects, incorporated via a single parameter characterizing the rigidity of encapsulation material interfaces. By analysing the twist-angle dependence of weak-to-strong lattice relaxation transition in twisted transition metal dichalcogenide bilayers, we show that increasing interface rigidity raises the crossover twist angle between the two relaxation regimes. Furthermore, tuning this rigidity parameter allows achieving good agreement with existing experimental results.

封装保护功能层,确保结构稳定性,提高组装的范德华异质结构的质量。在这里,我们开发了一个模型,该模型描述了考虑封装效应的扭曲双层中的晶格弛豫,并通过表征封装材料界面刚度的单个参数结合在一起。通过分析扭曲过渡金属二硫化物双层中弱到强晶格弛豫转变的扭角依赖关系,我们发现界面刚度的增加提高了两种弛豫制度之间的交叉扭角。此外,调整该刚度参数可以实现与现有实验结果的良好一致。
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引用次数: 0
Sustainable water treatment solutions using MOFs: enhancing efficiency and reducing environmental impact. 使用mof的可持续水处理解决方案:提高效率并减少对环境的影响。
IF 5.1 3区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2026-02-06 DOI: 10.1039/d5nr04933d
Amal A Nassar, Ayman K El-Sawaf, Anwaar O Ali, Mahmoud F Mubarak

Global water security faces dual challenges of increasing scarcity and persistent pollution. This review clarifies its focus by positioning metal-organic frameworks (MOFs) within the frameworks of environmental sustainability, the circular water economy, and life cycle assessment (LCA). While MOFs offer surface areas typically exceeding 1000 m2 g-1 and tunable porosity for adsorption and desalination, their transition to real-world application is limited by critical engineering hurdles. The scope of this work is explicitly defined by evaluating: (1) MOFs' role in addressing water scarcity; (2) their environmental and economic viability via LCA data; and (3) the identification of barriers to industrial deployment, including raw material costs, regulatory hurdles, and disposal risks. By synthesizing specific examples such as frameworks maintaining stability for 100 days in saline environments and systems targeting energy consumption below 1.0 kWh m-3 this review identifies the hydrothermal stability benchmarks and total cost of ownership (TCO) hurdles that must be overcome for large-scale commercialization. The focus remains on bridging the gap between laboratory-scale innovation and the practical requirements of sustainable water purification infrastructure.

全球水安全面临着日益稀缺和持续污染的双重挑战。本文通过在环境可持续性、循环水经济和生命周期评价框架内对金属有机框架(MOFs)进行定位,阐明了其研究重点。虽然mof的表面积通常超过1000 m2 g-1,并且可调孔隙度用于吸附和脱盐,但其向实际应用的过渡受到关键工程障碍的限制。本工作的范围是通过评估明确界定的:(1)MOFs在解决水资源短缺方面的作用;(2)通过LCA数据分析其环境和经济可行性;(3)识别产业部署的障碍,包括原材料成本、监管障碍和处置风险。通过综合具体的例子,例如在盐水环境中保持100天稳定性的框架和目标能耗低于1.0 kWh m-3的系统,本综述确定了热液稳定性基准和大规模商业化必须克服的总拥有成本(TCO)障碍。重点仍然是弥合实验室规模的创新与可持续水净化基础设施的实际要求之间的差距。
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引用次数: 0
Spatially Separated Bipolar Transport and Surface Electron Accumulation in Tungsten Diselenide Nanostructures 二硒化钨纳米结构的空间分离双极输运和表面电子积累
IF 6.7 3区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2026-02-06 DOI: 10.1039/d5nr03739e
Hemanth Kumar Bangolla, Chi-Yang Chen, Chang-Maw Cheng, Kuei-Yi Lee, Liang-Chiun Chao, Rajesh Kumar Ulaganathan, Raman Sankar, Abhishek Ghosh, Ruei-San Chen
We investigated the physical origins of the bipolar transport in WSe2 nanostructures and bulks. A high electron concentration at the surface induced by surface electron accumulation (SEA) has been confirmed by the angle-resolved photoemission spectroscopy (ARPES) measurements. The n-type surface coexisting with the unintentionally p-doped inner bulk of WSe2 results in an interesting “spatially separated” bipolar transport in this layered semiconductor. The selenium vacancies at the surface are inferred the major cause of SEA and their formation and passivation are highly dependent on the interaction of ambient molecules. The maximal surface electron concentration reaching 1020 cm3 is approximately four orders of magnitude higher than the hole concentration of its inner bulk in WSe2.
我们研究了WSe2纳米结构和块体中双极输运的物理起源。角分辨光发射光谱(ARPES)测量证实了表面电子积聚(SEA)引起的表面高电子浓度。n型表面与无意中掺杂p的WSe2内部体共存,导致该层状半导体中有趣的“空间分离”双极输运。表面硒空位是SEA的主要原因,其形成和钝化高度依赖于环境分子的相互作用。在WSe2中,最大表面电子浓度达到1020 cm × 3,比其内部体的空穴浓度高出约4个数量级。
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引用次数: 0
Additive manufacturing of glass with nanoscale features: recent progress and prospects 纳米玻璃增材制造研究进展与展望
IF 6.7 3区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2026-02-06 DOI: 10.1039/d5nr05425g
Kefan Guo, Yiling Lian, Juzheng Chen, Shiyu Ma, Yu Chen, Yang Lu
Additive manufacturing of glass enables 3D micro and nanoscale architectures with optical, photonic, and microfluidic functions beyond the reach of conventional glass processing. However, practical implementation remains constrained by the coupled limitations of achievable resolution, precursor conversion fidelity, thermally induced shrinkage, and manufacturing scalability, as well as by the limited compositional design space of printable glass precursors. Recent progress in photopolymerization based approaches, particularly single photon and two photon polymerizations, has enabled sub micrometer and nanoscale glass structuring through advances in precursor chemistry and post processing control. This review outlines the photopolymerization mechanisms, precursor design principles, and process structure coupling strategies that govern dimensional fidelity and surface quality in nanoscale glass additive manufacturing. Representative progress in micro and nanoscale optical, photonic, and microfluidic devices is summarized to illustrate how nanoscale glass additive manufacturing bridges process control and multifunctional device architectures. Key challenges associated with device level integration and structural fidelity in multifunctional glass microarchitectures are also discussed.
玻璃的增材制造使3D微纳米结构具有光学、光子和微流体功能,超出了传统玻璃加工的范围。然而,实际实施仍然受到可实现的分辨率、前驱体转换保真度、热致收缩和制造可扩展性的耦合限制,以及可打印玻璃前驱体的有限组成设计空间的限制。基于光聚合方法的最新进展,特别是单光子和双光子聚合,通过前体化学和后处理控制的进步,使亚微米和纳米级玻璃结构成为可能。本文概述了纳米级玻璃增材制造的光聚合机制、前驱体设计原则和工艺结构耦合策略,这些策略控制着尺寸保真度和表面质量。概述了微纳米级光学、光子和微流体器件的代表性进展,以说明纳米级玻璃增材制造如何连接过程控制和多功能器件架构。在多功能玻璃微架构中,与器件级集成和结构保真度相关的关键挑战也进行了讨论。
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引用次数: 0
Structurally Robust P/S Co-Deposited Ni–Fe Catalysts Enabling Long-Term Seawater Electrolysis at Ampere-Level Currents 结构坚固的P/S共沉积Ni-Fe催化剂可在安培电流下实现长期海水电解
IF 6.7 3区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2026-02-05 DOI: 10.1039/d5nr04610f
Divya Bhutani, Yadhu Krishnan P, Srivardan Balaji, Sneha James, Swaraj Servottam, Eswaramoorthy Muthusamy
Seawater, as an abundant and sustainable source, presents an effective alternative for overcoming the cost associated with electrolyzers utilizing fresh water sources. Its inherent ionic conductivity helps efficient green hydrogen generation using seawater electrolysis. However, the presence of chloride ions leads to catalyst dissolution and poor durability, posing significant challenges to long-term operation. In addition, polyionic species such as phosphates and sulfates can influence electrolysis performance by tuning the surface charge distribution, thereby suppressing the chloride adsorption. Herein, we developed Fe, S, and P co-deposited Ni foam catalysts, NF(Fe,P) and NF(Fe,P,S), to strategically exploit the role of polyionic species in enhancing the catalytic stability. The catalysts achieved high current densities of 1.60 A cm⁻² and 1.44 A cm⁻² at overpotentials of 390 mV and 530 mV, respectively, for the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). In a two-electrode arrangement, the assembled NF(Fe,P)//NF(Fe,P,S) cell showed a very high durability for 3000 h under ampere-level current density. The post-reaction characterization and electrochemical analyses reveal that the incorporation of polyionic species promotes favorable kinetics and suppresses chloride-induced degradation, resulting in high performance and long-term durability.
海水作为一种丰富和可持续的资源,为克服与利用淡水资源的电解槽相关的成本提供了有效的替代方案。其固有的离子导电性有助于利用海水电解高效的绿色制氢。然而,氯离子的存在导致催化剂溶解,耐久性差,对长期运行构成重大挑战。此外,磷酸盐和硫酸盐等多离子物质可以通过调节表面电荷分布来影响电解性能,从而抑制氯离子的吸附。在此,我们开发了铁、S、P共沉积镍泡沫催化剂NF(Fe,P)和NF(Fe,P,S),以战略性地利用多离子物种在提高催化稳定性方面的作用。在390 mV和530 mV的过电位下,催化剂的析氧反应(OER)和析氢反应(HER)的电流密度分别为1.60 A cm⁻²和1.44 A cm⁻²。在双电极布置下,组装的NF(Fe,P)//NF(Fe,P,S)电池在安培级电流密度下具有非常高的3000小时耐久性。反应后表征和电化学分析表明,多离子物种的加入促进了良好的动力学,抑制了氯化物诱导的降解,从而获得了高性能和长期耐用性。
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引用次数: 0
SLPcalculator: a web-based tool to estimate nanoparticle heating with peak analysis and F-test SLPcalculator:一个基于网络的工具,通过峰分析和f检验来估计纳米颗粒加热
IF 6.7 3区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2026-02-05 DOI: 10.1039/d5nr04995d
Iago López Vázquez, Yilian Fernández-Afonso, Antonio Santana-Otero, Sergiu Ruta, Alfredo Amigo, Maria del Puerto Morales, Roy W Chantrell, Lucia Gutierrez, David Serantes
Accurately determining the Specific Loss Power (SLP) remains a major challenge in magnetic hyperthermia and photothermal heating. In this work, we examine the practical implementation of the Peak Analysis Method (PAM), an alternative to Newton's-law-based approaches. Our focus is on how the number of data points affects the identification of the linear regime around the peak of the ∆T(t) curve, as this method relies on calculating and comparing the slopes of the heating and cooling branches around the maximum. Using an F-test-based statistical criterion, we objectively determine the valid linear range and compare the resulting SLP values with those obtained from the Initial Slope Method (ISM), one of the most common Newton-law-based approaches, which also relies on linear range fit. Our results reveal that the correct determination of the linear range leads to significantly different SLP values compared to those obtained using arbitrary time windows, underlining the necessity of employing statistical criteria for a robust and reproducible analysis. Finally, we introduce an open-access website (SLPcalculator.com) that integrates PAM with the Ftest, providing a systematic and user-friendly tool for reliable SLP estimation without the need for manual fitting procedures.
准确确定比损耗功率(SLP)仍然是磁热疗和光热加热的主要挑战。在这项工作中,我们研究了峰值分析方法(PAM)的实际实施,这是基于牛顿定律的方法的替代方案。我们的重点是数据点的数量如何影响识别∆T(T)曲线峰值附近的线性状态,因为这种方法依赖于计算和比较最大值附近的加热和冷却分支的斜率。使用基于f检验的统计标准,我们客观地确定了有效的线性范围,并将所得的SLP值与初始斜率法(ISM)所得的SLP值进行了比较,ISM是最常见的基于牛顿定律的方法之一,也依赖于线性范围拟合。我们的研究结果表明,与使用任意时间窗获得的结果相比,正确确定线性范围会导致SLP值显着不同,这强调了采用统计标准进行稳健和可重复分析的必要性。最后,我们介绍了一个开放访问的网站(SLPcalculator.com),该网站集成了PAM和Ftest,提供了一个系统和用户友好的工具,无需手动拟合程序即可进行可靠的SLP估计。
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引用次数: 0
Do the Halide Ions Exchange and Mix the Same Way in Fresh and Aged CsPbI3 - CsPbBr3 Perovskite Nanocrystals mixture? 在新鲜和陈化的CsPbI3 - CsPbBr3钙钛矿纳米晶混合物中卤化物离子交换和混合是否相同?
IF 6.7 3区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2026-02-05 DOI: 10.1039/d5nr03830h
Subitan Laskar, Chandran Sudakar
Ultrahigh quantum yield, bandgap tunability, and high absorption coefficient makes CsPbI3-xBrx perovskites ideal candidates for various optoelectronic applications. Post synthesis mixing of CsPbI3 and CsPbBr3 nanocrystals (NCs) is an effective approach to tune the optical properties of CsPbI3-xBrx QDs. The ion mixing mechanism in these perovskite NCs have been of great interest, as they shed valuable insights on how the halide ions get exchanged between the neighbouring NCs. The exchange, mixing, and alloying of halide ions between NCs are influenced by various parameters controlling these reactions. In this study we report two contrasting pathways, depending on the aging of the NCs, by which the halide ions get exchanged between the CsPbI3 and CsPbBr3 NCs. Changes in the photoluminescence spectra are monitored as a function of time to understand the dynamical changes in composition when CsPbBr3 and CsPbI3 NCs are mixed immediately after preparing and after aging for 50 days. Mixing of freshly synthesized CsPbBr3-NCs and CsPbI3-NCs in various ratios (2:1, 1:1 and 1:2) lead to both the Br⁻ and I⁻ ions getting rapidly incorporated into the CsPbI3 and CsPbBr3 NCs, respectively, as well as nucleation and growth of mixed halide composition, before the final equilibrium phase is formed. On the contrary, when ≧40 days aged NCs of CsPbBr3 are mixed with CsPbI3, the diffusion of ions seems to proceed in two-pathways, with the I⁻ ions from CsPbI3-NCs primarily dissolve and get incorporated into the CsPbBr3 lattice and equilibrium phase formation by nucleation, while Br⁻ ions do not incorporate into the CsPbI3 lattice. This more controlled reaction in aged samples is likely due to changes in surface chemistry of NCs, such as the formation of a robust ligand shell on CsPbI3-NCs, which allows one-way ion exchange.
超高量子产率、带隙可调性和高吸收系数使CsPbI3-xBrx钙钛矿成为各种光电应用的理想候选者。合成后混合CsPbI3和CsPbBr3纳米晶体(NCs)是调整CsPbI3- xbrx量子点光学性质的有效方法。这些钙钛矿NCs中的离子混合机制引起了极大的兴趣,因为它们为卤化物离子如何在邻近的NCs之间交换提供了有价值的见解。卤化物离子在nc之间的交换、混合和合金化受到控制这些反应的各种参数的影响。在这项研究中,我们报告了两种不同的途径,取决于NCs的老化,通过这些途径,卤化物离子在CsPbI3和CsPbBr3 NCs之间交换。监测CsPbBr3和CsPbI3纳米材料制备后立即混合和老化50 d后的光致发光光谱随时间的变化,了解其组成的动态变化。新合成的CsPbBr3-NCs和CsPbI3-NCs以不同的比例(2:1,1:1和1:2)混合,导致Br和I毒血症分别迅速融入CsPbI3和CsPbBr3 NCs中,并在最终平衡阶段形成之前形成混合卤化物成分的成核和生长。相反,当≥40天的CsPbBr3的NCs与CsPbI3混合时,离子的扩散似乎有两种途径,CsPbI3-NCs的I -毒化物主要溶解并结合到CsPbBr3晶格中,通过成核形成平衡相,而Br -毒化物则不结合到CsPbI3晶格中。在老化样品中,这种更受控制的反应可能是由于NCs表面化学的变化,例如CsPbI3-NCs上形成了一个强大的配体壳,允许单向离子交换。
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引用次数: 0
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