FlatChem最新文献_第2页

Physically and chemically modified zeolite templated nitrogenous carbons for enhanced hydrogen adsorption 物理和化学改性沸石模板化氮碳增强氢气吸附能力

IF 5.9 3区材料科学 Q2 CHEMISTRY, PHYSICAL

FlatChem

Pub Date : 2024-10-22 DOI: 10.1016/j.flatc.2024.100767

Sohan Bir Singh, Priyanka Hajare, Ruhit Jyoti Konwar, Mahuya De

Carbon materials have great potential for hydrogen adsorption due to their remarkable specific surface area, unique pore size characteristics and ability to functionalize with metal or non-metal. In this work, zeolite templated carbons were physically and chemically modified by varying preparation conditions to study their impact on structure and hydrogen adsorption capacity. The resultant templated carbons showed surface area in the range of 608–1665 m²/g and pore volume between 0.63 to 1.00 cc/g, with 28–48 % microporosity depending on synthesis conditions. The surface area and pore volume increased with increasing carbon deposition temperature from 650 to 750 °C and both decreased at higher carbon deposition temperature of 850 °C. At heat treatment temperature of 900 °C, the surface area and pore volume of templated carbons were observed to be higher. Incorporation of nitrogen heteroatom in carbon matrix during carbon deposition might have facilitated porosity. Use of argon as carrier gas resulted in the highest surface area (1665 m²/g), micropore area (597 m²/g) and pore volume (1.0 cc/g). The same templated carbon showed maximum hydrogen adsorption capacity of 0.20 and 2.81 wt% at 25 and –196 °C, respectively at 15 bar. On addition of platinum to templated carbon, the hydrogen adsorption capacity was significantly improved from 0.20 to 0.28 wt% at 25 °C and from 2.81 to 3.24 wt% at –196 °C. The strong affinity of Pt for hydrogen might have enhanced hydrogen adsorption.

碳材料具有显著的比表面积、独特的孔径特征以及与金属或非金属功能化的能力，因此在吸附氢气方面具有巨大的潜力。在这项工作中，通过改变制备条件对沸石模板碳进行了物理和化学修饰，以研究其对结构和氢吸附能力的影响。根据合成条件的不同，模板碳的比表面积在 608-1665 m2/g 之间，孔体积在 0.63-1.00 cc/g 之间，微孔率为 28-48%。表面积和孔体积随着碳沉积温度（650 至 750 °C）的升高而增大，而在碳沉积温度较高的 850 °C，表面积和孔体积均有所减小。在热处理温度为 900 ℃ 时，模板碳的表面积和孔隙率都较高。在碳沉积过程中，碳基体中氮杂质原子的掺入可能有助于提高孔隙率。使用氩气作为载气可获得最高的表面积（1665 m2/g）、微孔面积（597 m2/g）和孔隙率（1.0 cc/g）。同样的模板碳在 15 巴压力下，温度分别为 25 和 -196 ℃ 时的最大氢吸附容量分别为 0.20 和 2.81 wt%。在模板碳中加入铂后，氢气吸附能力显著提高，25 °C时从0.20 wt%提高到0.28 wt%，-196 °C时从2.81 wt%提高到3.24 wt%。铂对氢的强亲和力可能增强了对氢的吸附。

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引用次数: 0

Design of biphenylene-derived tunable dirac materials 设计源自联苯的可调谐狄拉克材料

IF 5.9 3区材料科学 Q2 CHEMISTRY, PHYSICAL

FlatChem

Pub Date : 2024-10-17 DOI: 10.1016/j.flatc.2024.100760

Iuegyun Hong , Hyeonhu Bae , Jeonghwan Ahn , Hyeondeok Shin , Hoonkyung Lee , Yongkyung Kwon

The exploration of carbon allotropes has unveiled a series of two-dimensional (2D) materials with unique electronic and mechanical properties, yet the need for stable structures with tailored electronic properties persists. In this study, we introduce a new class of 2D carbon allotropes derived from the biphenylene network (BPN), incorporating acetylenic linkages to tune their structural and electronic characteristics. Through density functional theory calculations, we identified ten novel BPN-derived structures that exhibit both energetic and dynamic stability, confirmed by cohesive energy and phonon spectrum analyses. Among them, BPN-02 and BPN-04 are metallic, featuring critically-tilted type-III Dirac cones under

\sim 5

% biaxial strain, while BPN-22 is a semiconductor with a band gap of 0.95 eV and exhibits highly anisotropic carrier mobility. Additionally, these structures demonstrate significant anisotropy in their elastic properties, further distinguishing them from other 2D carbon materials like graphene. Our findings suggest that these novel BPN-based structures have strong potential for next-generation electronic and optoelectronic applications, providing new avenues for the design and synthesis of advanced carbon materials.

对碳同素异形体的探索揭示了一系列具有独特电子和机械特性的二维（2D）材料，但对具有定制电子特性的稳定结构的需求依然存在。在本研究中，我们介绍了一类源自联苯网络（BPN）的新型二维碳同素异形体，它们结合了乙炔连接来调整其结构和电子特性。通过密度泛函理论计算，我们确定了十种新型 BPN 衍生结构，这些结构具有能量稳定性和动态稳定性，并通过内聚能和声子谱分析得到了证实。其中，BPN-02 和 BPN-04 是金属结构，在 5% 的双轴应变下具有临界倾斜的 III 型狄拉克锥，而 BPN-22 则是带隙为 0.95 eV 的半导体，表现出高度各向异性的载流子迁移率。此外，这些结构的弹性特性也表现出显著的各向异性，进一步将它们与石墨烯等其他二维碳材料区分开来。我们的研究结果表明，这些基于 BPN 的新型结构在下一代电子和光电应用中具有巨大潜力，为先进碳材料的设计和合成提供了新途径。

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引用次数: 0

Flash Joule heating technology in two-dimensional materials and beyond 二维材料及其他领域的闪焦耳加热技术

IF 5.9 3区材料科学 Q2 CHEMISTRY, PHYSICAL

FlatChem

Pub Date : 2024-10-12 DOI: 10.1016/j.flatc.2024.100765

Yaohui Wang , Zhu Ding , Muhammad Ahsan Iqbal , Nayab Arif , Luyan Li , Peng Li , Yu-Jia Zeng

In recent decades, ongoing exploration on material synthesis, coupled with advancements in science and technology, has led to the invention and application of numerous specialized devices. To fulfill the demand for high-performance materials in modern society, flash Joule heating (FJH) has been invented and applied in this context to achieve high efficiency, low cost, and environmental sustainability in material synthesis. This technology offers fast heating and cooling rates, high energy utilization, and promising results in material synthesis. FJH finds its applications in synthesizing two-dimensional materials, recycling battery metals, graphite, cathode, and recovery of precious metals from mines. This review presents an overview of FJH technology and its applications and prospects.

近几十年来，随着科学技术的发展，人们对材料合成的不断探索，发明并应用了许多专用设备。为了满足现代社会对高性能材料的需求，人们发明并应用了闪焦耳加热（FJH）技术，以实现材料合成的高效率、低成本和环境可持续性。该技术加热和冷却速度快，能量利用率高，在材料合成中具有良好的效果。FJH 可应用于合成二维材料、回收电池金属、石墨、阴极以及从矿山回收贵金属。本综述概述了 FJH 技术及其应用和前景。

引用次数: 0

Uncovering efficient sensing properties of vanadium disulfide (VS2) nanosheets towards specific neurotransmitters: A DFT prospective 揭示二硫化二钒（VS2）纳米片对特定神经递质的高效传感特性：DFT 展望

IF 5.9 3区材料科学 Q2 CHEMISTRY, PHYSICAL

FlatChem

Pub Date : 2024-10-11 DOI: 10.1016/j.flatc.2024.100764

Muhammad Mushtaq , Iltaf Muhammad , Zheng Chang , Zhang Leilei , Muhammad Abdul Rauf Khan , Neda Rahmani , Alireza Shabani , Hyeonhu Bae , Hoonkyung Lee , Tanveer Hussain

Designing efficient nanosensors based on ultrathin materials for the detection of neurotransmitters is crucial for biosensing applications. In this work, using spin-polarized density functional theory (DFT) calculations, structural, electronic, magnetic, and adsorption of the selected neurotransmitters, such as dopamine (DA) and histamine (HA), were investigated using light transition metals dichalcogenides, vanadium disulfide (VS₂) nanosheets. It was revealed that DA and HA adsorbed relatively weakly on pristine (p-VS₂) as well as single sulfur (S) Vacancy-induced (SV-VS₂). However, the introduction of selected transition metals (TMs) dopants, such as cobalt (Co), iron (Fe), and nickel (Ni), significantly improved the adsorption of DA and HA. Among the studied systems, Ni-doped VS₂ (Fe-doped VS₂) exhibited the strongest adsorption toward DA (HA) with an adsorption energy of −2.00 (−1.28) eV, which is promising for practical sensing applications. Charge analysis revealed that both DA and HA acted as charge donors to the TMs-doped VS₂. Upon DA/HA adsorptions, quantifiable variations were observed in the electronic structures and magnetic properties of TMs-doped VS₂, which were studied through band structures, spin-polarized density of states, and work function calculations. Lastly, for the practical detection capabilities at diverse pressure and temperature settings, we employed the Langmuir adsorption model. It was found that TMs-doped VS₂ detected DA and HA at concentrations ranging from tens of ppt to ppm levels, respectively. We strongly believe that our findings will contribute towards the development of highly effective nanosensors based on TMs-doped VS₂ nanosheets for the detection of DA, and HA.

设计基于超薄材料的高效纳米传感器来检测神经递质对于生物传感应用至关重要。在这项工作中，利用自旋极化密度泛函理论（DFT）计算，使用轻过渡金属二卤化物、二硫化钒（VS2）纳米片研究了所选神经递质（如多巴胺（DA）和组胺（HA））的结构、电子、磁性和吸附。结果表明，DA 和 HA 在原始（p-VS2）和单硫（S）空位诱导（SV-VS2）上的吸附相对较弱。然而，引入选定的过渡金属（TMs）掺杂剂，如钴（Co）、铁（Fe）和镍（Ni），可显著改善 DA 和 HA 的吸附。在所研究的体系中，掺镍的 VS2（掺铁的 VS2）对 DA（HA）的吸附力最强，吸附能为 -2.00 (-1.28) eV，有望用于实际传感应用。电荷分析表明，DA 和 HA 都是掺杂了 TMs 的 VS2 的电荷供体。吸附 DA/HA 后，掺杂 TMs 的 VS2 的电子结构和磁性能发生了可量化的变化，研究人员通过带状结构、自旋极化态密度和功函数计算对这些变化进行了研究。最后，为了在不同压力和温度条件下实现实际检测能力，我们采用了朗缪尔吸附模型。结果发现，掺杂了 TMs 的 VS2 能分别在几十 ppt 到 ppm 的浓度范围内检测到 DA 和 HA。我们坚信，我们的研究结果将有助于开发基于掺杂 TMs 的 VS2 纳米片的高效纳米传感器，用于检测 DA 和 HA。

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引用次数: 0

The emergence of graphene and its nanomaterials based natural rubber nanocomposites: A short review on the latest trends on its preparations, properties and applications 基于石墨烯及其纳米材料的天然橡胶纳米复合材料的出现：石墨烯及其纳米材料基天然橡胶纳米复合材料的出现：有关其制备、性能和应用的最新趋势简评

IF 5.9 3区材料科学 Q2 CHEMISTRY, PHYSICAL

FlatChem

Pub Date : 2024-10-10 DOI: 10.1016/j.flatc.2024.100758

Sachin Sharma Ashok Kumar , M. Nujud Badawi , Khishn K. Kandiah , K. Ramesh , S. Ramesh , S. Ramesh , S.K. Tiong

The two-dimensional (2D) graphene material has been a rising star in the area of polymer nanocomposites and materials science due to its excellent mechanical, electrical and thermal properties, gas barrier performance and high surface area. Hence, this makes graphene and its nanomaterials an ideal multifunctional filler for rubbers, which improved the overall properties of the natural rubber (NR) matrix. However, in order to tailor the interfacial interaction, appropriate graphene dispersion, the vulcanization kinetics etc., it is vital to carefully consider the utilization of the graphene properties in the rubber nanocomposites to yield high quality nanocomposites. This review offers the coverage on the recent methods and trends to uniformly disperse nanofillers in rubber matrix, to construct a strong interfacial interaction between the NR and graphene and the effects of graphene oxide (GO) and reduced GO (rGO) on the vulcanization behaviour of NR nanocomposites. The properties of these nanocomposites will be discussed to provide an intuition into the major necessities of graphene fillers with respect to several industrial applications. Finally, the challenges that need to be addressed in order to attain advanced device performance will be discussed along with the future perspectives. It is envisaged that the outstanding functional properties of the 2D fillers and their combinations could be exploited to fabricate graphene/NR nanocomposites, thus making it a potential candidate as a new class of advanced materials in the near future.

二维（2D）石墨烯材料因其优异的机械、电气和热性能、气体阻隔性能和高比表面积，已成为聚合物纳米复合材料和材料科学领域一颗冉冉升起的新星。因此，石墨烯及其纳米材料成为橡胶的理想多功能填料，可改善天然橡胶（NR）基体的整体性能。然而，为了定制界面相互作用、适当的石墨烯分散、硫化动力学等，必须仔细考虑如何在橡胶纳米复合材料中利用石墨烯的特性，以获得高质量的纳米复合材料。本综述介绍了在橡胶基体中均匀分散纳米填料、在 NR 与石墨烯之间构建强界面相互作用的最新方法和趋势，以及氧化石墨烯 (GO) 和还原 GO (rGO) 对 NR 纳米复合材料硫化行为的影响。我们将讨论这些纳米复合材料的特性，以便让人们直观地了解石墨烯填料在几种工业应用中的主要必要性。最后，还将讨论实现先进设备性能所面临的挑战以及未来展望。预计二维填料及其组合的出色功能特性可用于制造石墨烯/NR 纳米复合材料，从而使其在不久的将来成为一类新型先进材料的潜在候选材料。

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引用次数: 0

Synergistic advancements: Exploring MXene/graphene oxide and MXene/reduced graphene oxide composites for next-generation applications 协同进步：探索用于下一代应用的 MXene/氧化石墨烯和 MXene/还原氧化石墨烯复合材料

IF 5.9 3区材料科学 Q2 CHEMISTRY, PHYSICAL

FlatChem

Pub Date : 2024-10-10 DOI: 10.1016/j.flatc.2024.100759

Siavash Iravani , Atefeh Zarepour , Ehsan Nazarzadeh Zare , Pooyan Makvandi , Arezoo Khosravi , Ali Zarrabi

The exploration of MXene-graphene oxide (GO) and MXene-reduced GO (rGO) composites represents a significant leap forward in the development of advanced materials for next-generation applications. This review delves into the synergistic properties of MXene and GO, highlighting their combined potential to develop various technological fields. MXenes, with their unique two-dimensional structure and exceptional electrical conductivity, coupled with the remarkable mechanical strength and flexibility of GO, create composites with enhanced performance characteristics. These materials exhibit superior electrochemical properties, making them ideal candidates for energy storage devices such as supercapacitors and batteries. Additionally, their excellent thermal and mechanical properties open new avenues in the fields of electronics, sensors, and catalysis. This review seeks to explore the specific areas where MXene-(r)GO composites demonstrate exceptional promise, such as energy storage, sensing technologies, electromagnetic interference shielding, visible/infrared camouflages, and advanced materials development. These composites offer a promising pathway to address the growing demands for high-performance, multifunctional materials in various industrial sectors. This review aims to provide insights into the fundamental mechanisms driving the enhanced properties of MXene-(r)GO composites and to inspire further research and development in this exciting area of material science.

对 MXene-氧化石墨烯（GO）和 MXene-还原 GO（rGO）复合材料的探索，代表着在开发用于下一代应用的先进材料方面的一次重大飞跃。本综述深入探讨了 MXene 和 GO 的协同特性，强调了它们在开发各种技术领域的综合潜力。二氧杂环烯具有独特的二维结构和优异的导电性，再加上 GO 卓越的机械强度和柔韧性，可制成具有更高性能特征的复合材料。这些材料具有优异的电化学特性，是超级电容器和电池等储能设备的理想候选材料。此外，它们出色的热性能和机械性能也为电子、传感器和催化领域开辟了新的途径。本综述旨在探讨 MXene-(r)GO复合材料在能源储存、传感技术、电磁干扰屏蔽、可见光/红外线伪装和先进材料开发等特定领域的应用前景。这些复合材料为满足各工业领域对高性能、多功能材料日益增长的需求提供了一条大有可为的途径。本综述旨在深入探讨 MXene-(r)GO复合材料性能增强的基本机理，并鼓励在这一令人兴奋的材料科学领域开展进一步的研究和开发。

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引用次数: 0

Photocatalytic performance of acid exfoliated graphitic carbon nitride (g-C3N4) for the degradation of dye under direct sunlight 酸性剥落氮化石墨（g-C3N4）在阳光直射下降解染料的光催化性能

IF 5.9 3区材料科学 Q2 CHEMISTRY, PHYSICAL

FlatChem

Pub Date : 2024-10-10 DOI: 10.1016/j.flatc.2024.100762

H.M. Solayman , Noor Yahida Yahya , Kah Hon Leong , Md. Kamal Hossain , Kang Kang , Lan Ching Sim , Kyung-Duk Zoh , Md. Badiuzzaman Khan , Azrina Abd Aziz

Graphitic carbon nitride (g-C₃N₄) is one of the most promising semiconductor materials applied in photocatalytic applications. However, the photocatalytic performance of bulk g-C₃N₄ was not satisfactory due to poor visible-light absorption, quick recombination, and low amount of active interfacial reaction sites. In this study, we have modified the bulk g-C₃N₄ by acid (nitric, hydrochloric and sulphuric) exfoliation to enhance the photocatalytic degradation of methylene blue (MB) and methyl orange (MO) dye. Sulfuric acid-treated g-C₃N₄ photocatalyst (CN-S) presented significant photocatalytic degradation toward both MO and MB compared to the pristine g-C₃N₄. The photocatalytic degradation performance for CN-S is found to be ∼ 96.89 % for MO and ∼ 93.12 % for MB under 150 min under direct sunlight irradiation. Free radical scavenging tests showed the superoxide radicals (•O₂⁻) were mostly responsible to the photodegradation of dyes while comparing to hydroxyl radicals (•OH) and photo-induced holes (h⁺). Which is attributed by Photoluminescence (PL) and time resolved PL emission spectra indicated a low electron-hole pair’s (e⁻/h⁺) recombination and longer charge-carrier lifetime. Moreover, the CN-S showed excellent recyclability for up to 5 runs with a slight reduction of degradation performance from 96.89 to 90.55 % for MO and 93.12 % to 88.84 % for MB dye, respectively. Ultimately, the results demonstrated that CN-S was a superb photocatalyst for the elimination and deterioration of MB and MO dyes from wastewater.

氮化石墨碳（g-C3N4）是光催化应用中最有前途的半导体材料之一。然而，块状 g-C3N4 的光催化性能并不令人满意，原因在于其对可见光的吸收能力较差、重组速度快以及活性界面反应位点较少。在本研究中，我们通过酸（硝酸、盐酸和硫酸）剥离对块状 g-C3N4 进行了改性，以增强其对亚甲蓝（MB）和甲基橙（MO）染料的光催化降解能力。与原始 g-C3N4 相比，硫酸处理过的 g-C3N4 光催化剂（CN-S）对 MO 和 MB 的光催化降解效果显著。在阳光直射下 150 分钟，CN-S 对 MO 的光催化降解率为 96.89%，对 MB 的光催化降解率为 93.12%。自由基清除试验表明，与羟自由基（-OH）和光诱导空穴（h+）相比，超氧自由基（-O2-）对染料的光降解起主要作用。光致发光（PL）和时间分辨 PL 发射光谱表明，电子-空穴对（e-/h+）重组率低，电荷-载流子寿命长。此外，CN-S 在长达 5 次的运行中表现出优异的可回收性，但降解性能略有下降，MO 和 MB 染料的降解性能分别从 96.89% 和 93.12% 下降到 90.55% 和 88.84%。最终，研究结果表明，CN-S 是消除和降解废水中 MB 和 MO 染料的极佳光催化剂。

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引用次数: 0

Sustainable vertically-oriented graphene-electrode memristors for neuromorphic applications 用于神经形态应用的可持续垂直导向石墨烯电极忆阻器

IF 5.9 3区材料科学 Q2 CHEMISTRY, PHYSICAL

FlatChem

Pub Date : 2024-10-09 DOI: 10.1016/j.flatc.2024.100755

Ben Walters, Michael S.A. Kamel, Mohan V. Jacob, Mostafa Rahimi Azghadi

Neuromorphic computing, an innovative field in electronic and computing engineering, aims to enhance computing paradigms by simulating brain processes. Memristors, a two-terminal device, hold promise in revolutionising neuromorphic architectures by circumventing the Von-Neumann bottleneck. The performance and applicability of memristors heavily rely on the materials and fabrication processes employed. Graphene exhibits unique properties that can be leveraged in memristor design. Moreover, graphene stands out as a material with the potential for large-scale, sustainable production through Plasma Enhanced Chemical Vapour Deposition (PECVD). Notably, the properties of graphene-electrode memristors vary with minor structural differences induced by different PECVD temperatures. This paper reports the synthesis of graphene electrodes by time- and cost-effective PECVD from a sustainable plant extract for memristors. In addition, this paper delves into investigating how these structural variations impact the properties of graphene memristors and explores their potential exploitation in neuromorphic applications for implementing the well-known Spike Timing Dependent Plasticity (STDP) learning mechanism. The paper also utilises the developed STDP learning to perform an unsupervised spike-based pattern classification task.

神经形态计算是电子和计算工程领域的一个创新领域，旨在通过模拟大脑过程来改进计算模式。忆阻器是一种双端器件，有望通过规避冯-诺伊曼瓶颈彻底改变神经形态架构。忆阻器的性能和适用性在很大程度上取决于所采用的材料和制造工艺。石墨烯具有独特的性能，可在忆阻器设计中加以利用。此外，石墨烯还是一种有潜力通过等离子体增强化学气相沉积（PECVD）技术实现大规模、可持续生产的材料。值得注意的是，石墨烯电极忆阻器的特性会因不同的 PECVD 温度而产生细微的结构差异。本文报告了利用一种可持续植物提取物，通过省时、经济的 PECVD 技术合成石墨烯电极，并将其用于忆阻器。此外，本文还深入研究了这些结构变化如何影响石墨烯忆阻器的特性，并探讨了在神经形态应用中利用石墨烯忆阻器实现著名的尖峰时序可塑性（STDP）学习机制的潜力。本文还利用所开发的 STDP 学习机制执行了一项基于尖峰模式的无监督分类任务。

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引用次数: 0

Development of 2D Ir-DMG nanosheets as a colorimetric sensor probe for Ni (II) sensing and a highly sensitive, reliable, and portable colorimetric sensor device for environmental analysis 开发二维 Ir-DMG 纳米片作为镍 (II) 检测的比色传感器探针，以及用于环境分析的高灵敏度、可靠和便携式比色传感器装置

IF 5.9 3区材料科学 Q2 CHEMISTRY, PHYSICAL

FlatChem

Pub Date : 2024-10-09 DOI: 10.1016/j.flatc.2024.100763

Hemal Weerasinghe , Maheshika Kumarihamy , Hui-Fen Wu

The era of nanomaterials made a revolutionary change in colorimetric sensing with ultra-high sensitivity, improved reactivity, and enhanced photoactivity. The first-ever novel 2D metal–organic nanosheets were synthesized using IrCl₃ and Dimethylglyoxime (DMG) by probe ultrasonication (PUS) followed by a solvothermal wet-chemical approach. This material has shown a rapid color change from yellow to crimson red with Ni (II) after the formation of complex. The UV–visible absorption spectra are the conventional methodology for colorimetric sensors and here, it was given a perfect linear relationship with an R² of 0.99 and an LOD of 1.60 µM (0.1 ppm). The average calculated molar extinction coefficient for this system was 1889.30 M⁻¹ cm⁻¹. This is comparatively high absorptivity value. In addition, a novel Arduino-based colorimetric sensor device and corresponding software were developed under the name of “Chrom Metrics”. This Arduino device is unique since it can sense all wavelengths and the combined RGB delta E values. Therefore, it can provide more information/rationale for colorimetry than other devices/methods. The same Ir-DMG & Ni (II) system showed a perfect linear relationship with an R² of 0.98 and a LOD of 0.85 µM (0.05 ppm) by the data obtained from this sensor device. Thus, this new device is easier and more accurate, highly efficient, rapid, highly selective, and sensitive.

纳米材料时代的到来使比色传感技术发生了革命性的变化，它具有超高的灵敏度、更好的反应活性和更强的光活性。利用 IrCl3 和二甲基乙二醛（DMG），通过探针超声（PUS）和溶热湿化学方法首次合成了新型二维金属有机纳米片。该材料与 Ni (II) 形成络合物后，颜色迅速从黄色变为深红色。紫外-可见吸收光谱是比色传感器的传统方法，在这里，它具有完美的线性关系，R2 为 0.99，LOD 为 1.60 µM（0.1 ppm）。该系统计算得出的摩尔消光系数平均值为 1889.30 M-1 cm-1。这是一个相对较高的吸收值。此外，还以 "Chrom Metrics "为名开发了一种基于 Arduino 的新型比色传感器设备和相应软件。这种 Arduino 设备非常独特，因为它可以感应所有波长和 RGB delta E 值的组合。因此，与其他设备/方法相比，它能为色度测量提供更多信息/依据。同样的 Ir-DMG & Ni (II) 系统显示出完美的线性关系，R2 为 0.98，从该传感器装置获得的数据显示，LOD 为 0.85 µM（0.05 ppm）。因此，这种新装置更加简便、准确、高效、快速、高选择性和灵敏。

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引用次数: 0

Boosting supercapacitive performance of SnS2 via trace Pb doping 通过掺杂微量铅提高 SnS2 的超级电容性能

IF 5.9 3区材料科学 Q2 CHEMISTRY, PHYSICAL

FlatChem

Pub Date : 2024-10-05 DOI: 10.1016/j.flatc.2024.100756

Yuming Dai , Zhendong Hao , Yuhan Zeng , Guochang Li , Zhen Shen , Xingyu Zhu , Yuqian Xu , Xue Wang , Fangyu Zhu , Lijun Yang , Xizhang Wang , Qiang Wu , Zheng Hu

High-performance electrode materials are crucial for enhancing the performance of supercapacitors. Among various candidates, pseudo-capacitive SnS₂ is a promising one due to its high specific capacitance, earth-abundance, nontoxicity as well as low-cost. However, its actual electrochemical performance is restricted owing to the poor intrinsic conductivity and current fabrication processes on improving the conductivity are usually complicated. In this study, based on first-principles calculations, Pb doping is introduced to enhance the conductivity of SnS₂. Pb-doped SnS₂ nanosheets are synthesized via a simple one-step hydrothermal method. With trace Pb doping (Pb_o._o1SnS₂), an impressive 4-order-of-magnitude increase in conductivity was achieved compared to pristine SnS₂. Furthermore, Pb-doped SnS₂ nanosheets exhibit a superior mass-specific capacitance of 533.7 F g⁻¹ at 50 mV s⁻¹ and excellent long-term capacitance retention of 90.2 % over 100,000 cycles at 5 A g⁻¹. This study presents a simple and effective approach to enhancing the supercapacitor performance of SnS₂ and advances the practical applications of electrochemical energy storage devices based on 2D materials.

高性能电极材料对于提高超级电容器的性能至关重要。在各种候选材料中，赝电容 SnS2 因其高比电容、富集性、无毒性和低成本而很有前途。然而，由于其内在电导率较低，其实际电化学性能受到限制，而且目前提高电导率的制造工艺通常比较复杂。本研究在第一原理计算的基础上，引入了掺杂铅来提高 SnS2 的导电性。掺杂铅的 SnS2 纳米片是通过简单的一步水热法合成的。与原始 SnS2 相比，掺杂痕量 Pb（Pbo.o1SnS2）后的电导率提高了 4 个数量级，令人印象深刻。此外，掺杂铅的 SnS2 纳米片在 50 mV s-1 的条件下显示出 533.7 F g-1 的优异质量比电容，在 5 A g-1 的条件下，经过 100,000 次循环，电容保持率达到 90.2%。这项研究提出了一种简单有效的方法来提高 SnS2 的超级电容器性能，并推动了基于二维材料的电化学储能器件的实际应用。

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引用次数: 0