Applied Surface Science最新文献_第7页

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science

Pub Date : 2024-11-12 DOI: 10.1016/j.apsusc.2024.161773

Sandeep Kumar Paral , Jeng-Ywan Jeng , Chen-Hung Wu , Guan-Wei Lin , Yih-Lin Cheng , Ding-Zheng Lin

Liquid crystal display (LCD) vat photopolymerization (VPP) is gaining attention among polymer-based additive manufacturing (AM) processes due to its high accuracy, superior surface finish, and cost-efficiency. However, one of the main challenges is the high layer separation force, which is heavily influenced by the flexibility of the interface. Sticking between polydimethylsiloxane (PDMS) and the LCD panel reduces flexibility, shifting the separation behavior from Johnson-Kendall-Roberts (JKR) to Derjaguin-Muller-Toporov (DMT)-like behavior. This study presents a novel approach to mitigate PDMS sticking by introducing nanoscale surface roughness. Sandblasted sheet metals with varying sand mesh sizes were used as molds to create interfaces with different roughness levels. The findings reveal that a surface roughness of 0.262µm significantly reduces PDMS sticking, making the interface more flexible. The optimized flexible interface (SP 2000) interface reduced the separation force 50-fold compared to unmodified PDMS while maintaining high print resolution. Case studies involving rigid and flexible photopolymer resins further emphasize the effectiveness of the SP 2000 interface in addressing PDMS sticking issues. This research highlights the critical role of interface flexibility and presents a promising solution for improving LCD VPP performance.

液晶显示器（LCD）大桶光聚合（VPP）因其高精度、出色的表面光洁度和成本效益，在聚合物基增材制造（AM）工艺中日益受到关注。然而，主要挑战之一是层分离力大，这在很大程度上受到界面柔韧性的影响。聚二甲基硅氧烷（PDMS）和液晶面板之间的粘连会降低柔韧性，使分离行为从约翰逊-肯德尔-罗伯茨（JKR）转变为类似于德雅金-穆勒-托波洛夫（DMT）的行为。本研究提出了一种通过引入纳米级表面粗糙度来减轻 PDMS 粘连的新方法。使用不同砂目尺寸的喷砂金属板作为模具，创建具有不同粗糙度的界面。研究结果表明，0.262 µm 的表面粗糙度可显著减少 PDMS 粘附，使界面更具柔韧性。与未经改性的 PDMS 相比，优化的柔性界面 (SP 2000) 接口在保持高打印分辨率的同时，将分离力降低了 50 倍。涉及刚性和柔性光聚合物树脂的案例研究进一步强调了 SP 2000 接口在解决 PDMS 粘连问题方面的有效性。这项研究强调了界面柔性的关键作用，并为提高液晶显示屏的 VPP 性能提供了一种前景广阔的解决方案。

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引用次数: 0

Enhancement of thermoelectric transport in surface halogenated Ti2O MOenes via electron–phonon drag effect 通过电子-声子阻力效应增强表面卤化 Ti2O MOenes 的热电传输

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science

Pub Date : 2024-11-10 DOI: 10.1016/j.apsusc.2024.161766

Yu-Lu Wan , Cui-E Hu , Hua-Yun Geng , Xiang-Rong Chen

Designing efficient and environmentally friendly thermoelectric materials near room temperature is critical, and the electron–phonon drag effect on thermoelectric transport in monolayers remains largely unexplored. This manuscript systematically investigates the electron–phonon drag effect in surface halogenated Ti₂O MOenes (Ti₂OX₂, X = F, Cl) by solving fully coupled electron–phonon Boltzmann transport equations. We find that the phonon drag effect significantly enhances the total Seebeck coefficient and various electronic transport coefficients, including the thermal response of electrons to an electric field, electrical conductivity, and electronic thermal conductivity at zero field, while the electron drag effect notably increases the lattice thermal conductivity, especially at high carrier concentrations and low temperatures. Furthermore, the electron–phonon drag effect significantly increases the thermoelectric figure of merit (zT) across 100–900 K, with the greatest enhancement at low temperatures. At room temperature, zT increases by 13.73 times for Ti₂OF₂ and 2.82 times for Ti₂OCl₂, achieving maximum values of 0.92 and 0.84, respectively. Our work underscores the superior thermoelectric performance of surface halogenated Ti₂O MOenes near room temperature and the potential of leveraging electron–phonon drag effects to enhance the electrical, thermal and thermoelectric transport in monolayers.

设计接近室温的高效环保热电材料至关重要，而单层热电传输中的电子-声子阻力效应在很大程度上仍未得到探索。本手稿通过求解完全耦合的电子-声子波尔兹曼输运方程，系统地研究了表面卤化 Ti2O MOenes (Ti2OX2, X = F, Cl) 中的电子-声子阻力效应。我们发现声子拖曳效应显著提高了总塞贝克系数和各种电子输运系数，包括电子对电场的热响应、电导率和零场时的电子热导率，而电子拖曳效应显著提高了晶格热导率，尤其是在高载流子浓度和低温条件下。此外，电子-声子阻力效应显著提高了 100-900 K 的热电功勋值（zT），其中低温时的提高幅度最大。在室温下，Ti2OF2 和 Ti2OCl2 的 zT 分别增加了 13.73 倍和 2.82 倍，最大值分别为 0.92 和 0.84。我们的工作强调了表面卤化 Ti2O MOenes 在室温附近的优异热电性能，以及利用电子-声子阻力效应增强单层中的电学、热学和热电传输的潜力。

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引用次数: 0

In situ synthesis of well-dispersed silver nanoparticles from silver nanoclusters hydrogel for catalytic reduction of 4-Nitrophenol 利用银纳米团簇水凝胶原位合成分散良好的银纳米粒子，用于催化还原 4-硝基苯酚

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science

Pub Date : 2024-11-10 DOI: 10.1016/j.apsusc.2024.161759

Jialu Xu , Yuting Bi , Hui Zhao , Laishun Shi , Na Zhang , Xia Xin

Facile, efficient and steady immobilization of metal nanoparticles upon various matrixes is an interesting topic in materials chemistry and heterogeneous catalysis. This study reports a facile in situ method for the synthesis and immobilization of silver nanoparticles (Ag NPs) from silver nanoclusters (Ag NCs) in the hydrogel at room temperature. Ag₉-NCs ((NH₄)₉[Ag₉(mba)₉], H₂mba = 2-mercaptobenzoic acid) acted as both gelator and silver source which combined with Ba(NO₃)₂ to construct hydrogel while sodium borohydride (NaBH₄) was used as a typical reductant during the synthesis process to generate Ag NPs in situ. As a result, Ag NPs with mean diameter of 1.96 nm were conveniently synthesized and firmly immobilized on the nanofibers of Ag₉-NCs/Ba(NO₃)₂ hydrogel without sophisticated manipulation. Accompanied with the reduction process, the coordination interaction combined with the hydrogen bonding, π-π stacking and hydrophobic interactions drove the assembly of Ag NPs/Ag₉-NCs/Ba(NO₃)₂. Moreover, the Ag NPs exhibited good catalytic activity toward the reduction of 4-nitrophenol (4-NP) and could be easily recovered and reused for more than eight cycles owing to the high stability based on hydrogel. This work provides an innovative strategy for metal NCs which could be highlighted as the promising candidates to be used as supramolecular assembly templates and metal sources for in situ preparation of metal nano-catalysts.

在各种基质上方便、高效、稳定地固定金属纳米粒子是材料化学和异相催化领域的一个有趣课题。本研究报告了一种在室温下从银纳米团簇（Ag NCs）在水凝胶中原位合成和固定银纳米粒子（Ag NPs）的简便方法。Ag9-NCs（(NH4)9[Ag9(mba)9]，H2mba = 2-巯基苯甲酸）既是凝胶剂又是银源，与 Ba(NO3)2 结合构建水凝胶，而硼氢化钠（NaBH4）则是合成过程中的典型还原剂，可在原位生成 Ag NPs。因此，无需复杂的操作，就能方便地合成出平均直径为 1.96 nm 的 Ag NPs，并牢固地固定在 Ag9-NCs/Ba(NO3)2 水凝胶的纳米纤维上。伴随着还原过程，配位相互作用与氢键、π-π堆积和疏水相互作用相结合，推动了 Ag NPs/Ag9-NCs/Ba(NO3)2 的组装。此外，Ag NPs 在还原 4-硝基苯酚（4-NP）时表现出良好的催化活性，并且由于基于水凝胶的高稳定性，Ag NPs 易于回收和重复使用，可循环使用八次以上。这项工作为金属 NCs 提供了一种创新策略，可将其作为超分子组装模板和金属源用于原位制备金属纳米催化剂。

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引用次数: 0

Dual layer-coating of PDMS to prevent calcification and bacterial infection for the potential use of urinary tract biomaterials 防止钙化和细菌感染的 PDMS 双层涂层，可用于泌尿道生物材料

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science

Pub Date : 2024-11-09 DOI: 10.1016/j.apsusc.2024.161738

Taehyeon Kim , Seongeun Cho , Bumgyu Choi , Jinkee Hong , U-Syn Ha , Won-Gun Koh

Polydimethylsiloxane (PDMS) is widely used in medical devices because of its exceptional properties. However, challenges, such as biofouling and bacterial infections, arise from their hydrophobic nature, especially in devices intended for the urinary tract. To address these issues, this study pioneered a surface modification strategy aimed at enriching PDMS with both hydrophilicity and antifouling attributes, making it ideal for urinary tract device applications. We introduced a novel dual-layer coating process, initially grafting a hydrogel-like poly(acrylic acid) (PAA) layer onto PDMS through benzophenone-mediated photoinitiated polymerization to enhance surface hydrophilicity. Subsequently, polyethyleneimine (PEI) was covalently bonded to the PAA layer, ensuring the formation of a stable antifouling surface that prevented bacterial adhesion and calcium deposition. This method guarantees a robust coating that performs consistently across various environmental conditions, including the fluctuating pH levels typical of the urinary tract. Comprehensive surface characterization validated the substantial improvements in hydrophilicity along with significant reductions in bacterial adhesion and calcium deposition. The innovative PAA/PEI dual-layer coating demonstrated marked superiority over conventional uncoated and single-layer-coated PDMS samples, offering a promising solution for enhancing the safety and efficacy of PDMS-based urinary tract devices. The implications of this study extend beyond immediate applications and provide valuable insights into the domains of biomaterials and medical device engineering.

聚二甲基硅氧烷（PDMS）因其优异的性能被广泛应用于医疗设备中。然而，由于其疏水性，特别是在用于泌尿道的设备中，存在生物污垢和细菌感染等难题。为了解决这些问题，本研究开创了一种表面改性策略，旨在丰富 PDMS 的亲水性和防污特性，使其成为泌尿道设备应用的理想材料。我们采用了一种新颖的双层涂层工艺，首先通过二苯甲酮介导的光引发聚合作用在 PDMS 上接枝一层水凝胶状的聚丙烯酸（PAA）层，以增强其表面亲水性。随后，聚乙烯亚胺（PEI）与 PAA 层共价键合，确保形成稳定的防污表面，防止细菌附着和钙沉积。这种方法保证了涂层的坚固性，在各种环境条件下（包括典型的泌尿道 pH 值波动）都能保持稳定的性能。全面的表面表征验证了亲水性的大幅改善，以及细菌附着和钙沉积的显著减少。创新的 PAA/PEI 双层涂层明显优于传统的无涂层和单层涂层 PDMS 样品，为提高基于 PDMS 的尿路装置的安全性和有效性提供了一种前景广阔的解决方案。这项研究的意义不仅限于眼前的应用，还为生物材料和医疗设备工程领域提供了宝贵的见解。

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引用次数: 0

Al modification layer method for enhancing InAlZnO transistors 用于增强 InAlZnO 晶体管的铝改性层方法

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science

Pub Date : 2024-11-08 DOI: 10.1016/j.apsusc.2024.161744

Jingye Xie , Jianbing Shi , Minghe Zhang , Junchen Dong , Dedong Han , Xing Zhang

In this work, a surface engineering method is proposed to boost electrical performance and stability of the InAlZnO (IAZO) transistors, of which an Al modification layer is deposited on surface of the IAZO channel layer. Through analysed by transmission electron microscope and X-ray photoelectron spectroscopy, the IAZO thin film with Al modification layer undergoes a reduction reaction to generate more oxygen vacancies. Hall effects measurement further demonstrates that IAZO thin films with Al modification layer exhibit higher carrier concentrations than the ones without Al modification layer. The IAZO transistors with Al modification layer exhibit better performance and stability, including a field-effect mobility of 4.36 cm² V⁻¹s⁻¹ (an improvement of about three-fold), a small subthreshold swing of 105.23 mV/decade, a high on-to-off current ratio greater than 10⁷, and a threshold voltage shift of less than 0.50 V under positive and negative gate bias stress. Moreover, the IAZO transistors with Al modification layer demonstrate high thermal stability under 400 °C for 120 min in air atmosphere. Based on this method, the IAZO inverters have been implemented with high voltage gain of 87.55 V/V. This surface engineering technology paves the way for application of high-performance oxide transistors for advanced monolithic three-dimensional integration.

本研究提出了一种表面工程方法来提高 InAlZnO（IAZO）晶体管的电气性能和稳定性，即在 IAZO 沟道层表面沉积一层铝修饰层。通过透射电子显微镜和 X 射线光电子能谱分析，带有铝修饰层的 IAZO 薄膜发生了还原反应，产生了更多的氧空位。霍尔效应测量进一步表明，与没有铝修饰层的 IAZO 薄膜相比，有铝修饰层的 IAZO 薄膜显示出更高的载流子浓度。带有铝修饰层的 IAZO 晶体管具有更好的性能和稳定性，包括 4.36 cm2 V-1s-1 的场效应迁移率（提高了约三倍）、105.23 mV/decade 的小亚阈值摆动、大于 107 的高导通-关断电流比，以及在正负栅极偏压应力下小于 0.50 V 的阈值电压偏移。此外，带有铝修饰层的 IAZO 晶体管在 400 °C 的空气环境中 120 分钟内表现出较高的热稳定性。基于这种方法，IAZO 逆变器实现了 87.55 V/V 的高电压增益。这项表面工程技术为将高性能氧化物晶体管应用于先进的单片三维集成铺平了道路。

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引用次数: 0

Tailored electronic properties of PdAu nanocatalysts via one-step electrodeposition for high-performance glucose sensors 通过一步电沉积定制 PdAu 纳米催化剂的电子特性，用于高性能葡萄糖传感器

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science

Pub Date : 2024-11-08 DOI: 10.1016/j.apsusc.2024.161750

Yang-Sheng Lu , Kuang-Chih Tso , Chun-Chun Hsu , Yu-Cih Wen , Jun Ohta , Tsyr-Yan Yu , Shao-Sian Li

The development of efficient and reliable glucose sensors is crucial for the early detection and management of diabetes mellitus. This study introduces a novel one-step electrodeposition method for fabricating bimetallic palladium-gold (PdAu) nanocatalysts directly onto gold electrodes, aimed at enhancing the electrocatalytic performance for non-enzymatic glucose sensing. The one-step electrodeposition technique not only simplifies the fabrication process but also enables precise control over the morphology and electronic properties of the PdAu nanostructures. The optimized electronic interactions between palladium and gold within the nanocatalyst significantly enhance electron transfer kinetics, leading to a high electroactive surface area and improved catalytic activity for glucose oxidation. As a result, the PdAu electrodes demonstrated superior glucose sensing capabilities, with a low detection limit of 83 µM and an impressive sensitivity of 67.2 µA mM^-1cm⁻² across a linear range of 1–8 mM glucose. The catalyst also exhibited excellent selectivity against common interfering species, as well as remarkable stability and reproducibility over an extended period. These findings underscore the significance of the one-step electrodeposition method in producing bimetallic catalysts with tailored electronic properties, offering a promising approach for advancing electrochemical biosensors in diabetes diagnosis.

开发高效可靠的葡萄糖传感器对于糖尿病的早期检测和管理至关重要。本研究介绍了一种新颖的一步电沉积方法，用于在金电极上直接制备双金属钯-金（PdAu）纳米催化剂，旨在提高非酶葡萄糖传感的电催化性能。一步电沉积技术不仅简化了制备过程，还能精确控制钯金纳米结构的形态和电子特性。纳米催化剂中钯和金之间优化的电子相互作用大大提高了电子传递动力学，从而产生了高电活性表面积，提高了葡萄糖氧化的催化活性。因此，PdAu 电极表现出卓越的葡萄糖传感能力，在 1-8 mM 葡萄糖的线性范围内，检测限低至 83 µM，灵敏度高达 67.2 µA mM-1cm-2。该催化剂还对常见干扰物具有极佳的选择性，并在较长时间内具有出色的稳定性和可重复性。这些发现强调了一步电沉积法在生产具有定制电子特性的双金属催化剂方面的重要意义，为推进糖尿病诊断中的电化学生物传感器提供了一种前景广阔的方法。

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引用次数: 0

Interaction mechanism of interfacial nano-micro bubbles with collectors and its effects on the fine apatite flotation 界面纳米微气泡与捕集剂的相互作用机理及其对精细磷灰石浮选的影响

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science

Pub Date : 2024-11-07 DOI: 10.1016/j.apsusc.2024.161736

Muyuan Zeng , Keyao Li , Lingyun Huang , Shenxu Bao , Cheng Liu , Siyuan Yang

This study focuses on the −38 μm apatite as the research subject and investigates the role of interfacial nano-micro bubbles (INMBs) generated by decompression techniques in the collector system of sodium oleate (NaOl) and dodecylamine (DDA). The results reveal that INMBs enhanced the flotation recovery of apatite using the collector NaOl while it had a slight inhibitory effect on apatite flotation with the collector DDA. The impact of INMBs on the apatite flotation was notable in pH 8–9, which could be attributed to the negative surface charge of INMBs. XPS analysis indicates that INMBs did not alter the collector adsorption by which the reagent molecules bonded with the apatite surface. AFM imaging and adsorption capacity experiments further reveal that the INMBs resulted in an adsorption density reduction of the reagent. This drop could be attributed to the nucleation and growth of INMBs, which effectively cleaned the collector molecules from the mineral surface. The transmittance test findings show that INMBs could significantly promote apatite aggregation in the collector system of NaOl rather than DDA. Overall, the difference in the roles of INMBs on apatite flotation using different collectors is considered as the combined influences of negative “surface reagent cleaning” and positive “fine particle aggregation”.

本研究以 -38 μm 磷灰石为研究对象，探讨了油酸钠（NaOl）和十二胺（DDA）捕收剂体系中通过减压技术产生的界面纳米微气泡（INMBs）的作用。结果表明，INMBs 在使用捕收剂 NaOl 时提高了磷灰石的浮选回收率，而在使用捕收剂 DDA 时对磷灰石的浮选有轻微的抑制作用。在 pH 值为 8-9 时，INMBs 对磷灰石浮选的影响明显，这可能是由于 INMBs 带有负表面电荷。XPS 分析表明，INMBs 并没有改变捕收剂的吸附作用，试剂分子是通过吸附作用与磷灰石表面结合的。原子力显微镜成像和吸附容量实验进一步表明，INMB 导致试剂的吸附密度降低。这种降低可归因于 INMBs 的成核和生长，它们有效地清除了矿物表面的集电极分子。透射率测试结果表明，在 NaOl 而不是 DDA 的捕集体系中，INMBs 能显著促进磷灰石的聚集。总之，INMBs 对使用不同捕收剂的磷灰石浮选的作用差异被认为是负向 "表面试剂清洁 "和正向 "细颗粒聚集 "的综合影响。

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引用次数: 0

Reaction pathway and anti-poisoning mechanism of Pt-based alloy catalysts in the ammonia oxidation reaction 铂基合金催化剂在氨氧化反应中的反应途径和抗中毒机理

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science

Pub Date : 2024-11-06 DOI: 10.1016/j.apsusc.2024.161731

Jiayu Zhang , Tianqi Yu , Lu Chen , Yanxia Li , Liqiang Yang , Haixiang He , Shibin Yin

In the electrochemical ammonia oxidation reaction (AOR), the alloying strategy is an effective method to improve the activity of Pt-based catalysts. Nevertheless, its reaction pathway and anti-poisoning mechanisms still need to be studied in detail to improve the understanding. In this study, the OS and GM mechanisms are considered simultaneously to systematically investigate the reaction pathway and anti-poisoning mechanism of Pt and PtM alloys (M = Fe, Co, Ni, Cu, and Zn) by density functional theory. The formation of PtFe, PtCo, PtCu, and PtZn alloys was observed to enhance the kinetics of the AOR. For Pt, PtCo, and PtZn, the GM mechanism is more prevalent in the AOR process due to the lower reaction energy barrier compared to the OS mechanism. Notably, this work demonstrates that the introduction of Fe, Co, Cu, and Zn induces an electronic structure change of Pt atoms, resulting in the weakening of the Pt−N bond and facilitating the desorption of *N and *N₂, therefore enhancing the anti-poisoning properties of the OS and GM mechanisms, respectively. This study deepens the understanding of the reaction pathway and anti-poisoning mechanisms of Pt-based alloy catalysts and presents an effective strategy for designing efficient and stable AOR catalysts.

在电化学氨氧化反应（AOR）中，合金化策略是提高铂基催化剂活性的有效方法。尽管如此，其反应途径和抗中毒机理仍有待详细研究，以加深理解。本研究同时考虑了 OS 和 GM 机制，通过密度泛函理论系统地研究了铂和铂锰合金（M = Fe、Co、Ni、Cu 和 Zn）的反应途径和抗中毒机理。观察到 PtFe、PtCo、PtCu 和 PtZn 合金的形成增强了 AOR 的动力学。对于铂、铂钴和铂锌来说，由于反应能垒比 OS 机制低，GM 机制在 AOR 过程中更为普遍。值得注意的是，这项研究表明，Fe、Co、Cu 和 Zn 的引入引起了铂原子电子结构的变化，导致铂-N 键的弱化，促进了 *N 和 *N2 的解吸，因此分别增强了 OS 和 GM 机制的抗中毒特性。该研究加深了对铂基合金催化剂反应途径和抗中毒机理的理解，为设计高效稳定的 AOR 催化剂提供了有效策略。

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引用次数: 0

One-step electrodeposition of reduced graphene oxide-amorphous carbon composite coatings for proton exchange membrane fuel cell bipolar plates 用于质子交换膜燃料电池双极板的还原氧化石墨烯-无定形碳复合涂层的一步式电沉积

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science

Pub Date : 2024-11-06 DOI: 10.1016/j.apsusc.2024.161725

Wei Liu, Wenjing Dong, Likui Guo, Yuan Feng, Naibao Huang, Xiannian Sun

In this paper, a convenient electrodeposition method is proposed to directly fabricate a reduced graphene oxide-amorphous carbon composite coating (rGO-ACC) on a 316L stainless steel substrate. The rGO-ACC coating is achieved through a one-step reduction by utilizing a choline chloride-ethylene glycol deep eutectic solvent (DES) with the dispersion of graphene oxide. The analysis results from SEM, Raman and XPS reveal that the obtained rGO-ACC coating, with layered wrinkle morphology, uniformly covers and covalently bonds to 316L stainless steel substrate. Potentiodynamic and potentiostatic polarization tests showed that the corrosion current densities of rGO-ACC coated 316L stainless steel were of the order of 10^-7 A cm⁻² in simulated proton exchange membrane fuel cells (PEMFC) working environment, indicating a significant improvement of corrosion resistance of 316L and an excellent electrochemical stability. Meanwhile, compared with the naked 316L steel, the interfacial contact resistance (ICR) of the coated stainless steel is significantly reduced due to the outstanding electrical conductivity of the coated rGO. The results manifested that deposited rGO-ACC on steel surface may be a highly promising modification method for PEMFC metal bipolar plates.

本文提出了一种便捷的电沉积方法，可在 316L 不锈钢基底上直接制备还原氧化石墨烯-非晶碳复合涂层（rGO-ACC）。利用氯化胆碱-乙二醇深共晶溶剂（DES）分散氧化石墨烯，通过一步还原实现了 rGO-ACC 涂层。扫描电镜、拉曼和 XPS 分析结果表明，所获得的 rGO-ACC 涂层具有分层皱纹形态，可均匀覆盖 316L 不锈钢基底并与之共价键合。在模拟质子交换膜燃料电池（PEMFC）工作环境下，电位动力和电位静态极化测试表明，rGO-ACC 涂层 316L 不锈钢的腐蚀电流密度为 10-7 A cm-2 量级，表明 316L 不锈钢的耐腐蚀性能显著提高，电化学稳定性极佳。同时，与裸316L钢相比，由于涂覆的rGO具有出色的导电性，涂覆不锈钢的界面接触电阻（ICR）显著降低。研究结果表明，在钢表面沉积 rGO-ACC 可能是一种非常有前景的 PEMFC 金属双极板改性方法。

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引用次数: 0

High temperature evolution of interfacial metal film bonding two 4H-SiC substrates 两个 4H-SiC 基板界面金属膜键合的高温演化

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science

Pub Date : 2024-11-06 DOI: 10.1016/j.apsusc.2024.161678

Maëlle Le Cunff , François Rieutord , Didier Landru , Oleg Kononchuk , Nikolay Cherkashin

The high temperature behavior of thin metal films (tungsten and titanium) confined between two off-axis single crystal SiC substrates is investigated. Through the application of transmission and scanning transmission electron microscopy, scanning electron microscopy, and X-ray scattering techniques, we examine the phase and morphology changes induced by high temperature annealing in thin layers consisting of these materials, as well as at their interfaces with SiC. Upon high-temperature annealing, a uniform and continuous W film formed by low-temperature deposition undergoes a transition to an array of discontinuous domains surrounded by a direct SiC/SiC interface. In contrast, a Ti film remains continuous with a strong thickness alteration. In parallel to step-bunching process of the internal SiC surfaces, both materials transform into new crystalline phases which contain Si and/or C atoms and achieve an epitaxial relationship with the SiC structures. The experimental findings are discussed in terms of dewetting phenomena and analyzed in light of potential chemical and structural reactions that may occur during interface reconstructions.

我们研究了限制在两个离轴单晶碳化硅基底之间的金属薄膜（钨和钛）的高温行为。通过应用透射和扫描透射电子显微镜、扫描电子显微镜和 X 射线散射技术，我们研究了高温退火在由这些材料组成的薄层中以及在它们与碳化硅的界面上引起的相位和形态变化。高温退火时，低温沉积形成的均匀连续的 W 薄膜会转变为不连续的畴阵列，周围是直接的 SiC/SiC 界面。与此相反，钛薄膜保持连续，但厚度变化很大。在碳化硅内表面阶梯式打结过程的同时，这两种材料都转变为含有硅原子和/或碳原子的新结晶相，并与碳化硅结构形成外延关系。实验结果从露水现象的角度进行了讨论，并根据界面重建过程中可能发生的化学和结构反应进行了分析。

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引用次数: 0