Author Affiliations
Abstract
1 College of Materials Science and Engineering, Shenzhen University, Shenzhen 518055, People’s Republic of China
2 State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, People’s Republic of China
The evolution of wearable technology has prompted the need for adaptive, self-healable, and energy-autonomous energy devices. This study innovatively addresses this challenge by introducing an MXene-boosted hydrogel electrolyte, which expedites the assembly process of flexible thermocell (TEC) arrays and thus circumvents the complicated fabrication of typical wearable electronics. Our findings underscore the hydrogel electrolyte's superior thermoelectrochemical performance under substantial deformations and repeated self-healing cycles. The resulting hydrogel-based TEC yields a maximum power output of 1032.1 nW under the ΔT of 20 K when being stretched to 500% for 1000 cycles, corresponding to 80% of its initial state; meanwhile, it sustains 1179.1 nW under the ΔT of 20 K even after 60 cut-healing cycles, approximately 92% of its initial state. The as-assembled TEC array exhibits device-level self-healing capability and high adaptability to human body. It is readily applied for touch-based encrypted communication where distinct voltage signals can be converted into alphabet letters; it is also employed as a self-powered sensor to in-situ monitor a variety of body motions for complex human actions. The swift assembly approach, combined with the versatile functionality of the TEC device, paves the way for future advancements in wearable electronics targeting at fitness monitoring and human–machine interfaces.
Nano-Micro Letters
2023, 15(1): 196
Author Affiliations
Abstract
1 Key Laboratory of Mesoscopic Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
2 Department of Physics and Engineering Physics, Tulane University, New Orleans, USA
Two-dimensional (2D) semiconductors have captured broad interest as light emitters, due to their unique excitonic effects. These layer-blocks can be integrated through van der Waals assembly,i.e., fabricating homo- or heterojunctions, which show novel emission properties caused by interface engineering. In this review, we will first give an overview of the basic strategies that have been employed in interface engineering, including changing components, adjusting interlayer gap, and tuning twist angle. By modifying the interfacial factors, novel emission properties of emerging excitons are unveiled and discussed. Generally, well-tailored interfacial energy transfer and charge transfer within a 2D heterostructure cause static modulation of the brightness of intralayer excitons. As a special case, dynamically correlated dual-color emission in weakly-coupled bilayers will be introduced, which originates from intermittent interlayer charge transfer. For homobilayers and type Ⅱ heterobilayers, interlayer excitons with electrons and holes residing in neighboring layers are another important topic in this review. Moreover, the overlap of two crystal lattices forms moiré patterns with a relatively large period, taking effect on intralayer and interlayer excitons. Particularly, theoretical and experimental progresses on spatially modulated moiré excitons with ultra-sharp linewidth and quantum emission properties will be highlighted. Moiré quantum emitter provides uniform and integratable arrays of single photon emitters that are previously inaccessible, which is essential in quantum many-body simulation and quantum information processing. Benefiting from the optically addressable spin and valley indices, 2D heterostructures have become an indispensable platform for investigating exciton physics, designing and integrating novel concept emitters.Two-dimensional (2D) semiconductors have captured broad interest as light emitters, due to their unique excitonic effects. These layer-blocks can be integrated through van der Waals assembly,i.e., fabricating homo- or heterojunctions, which show novel emission properties caused by interface engineering. In this review, we will first give an overview of the basic strategies that have been employed in interface engineering, including changing components, adjusting interlayer gap, and tuning twist angle. By modifying the interfacial factors, novel emission properties of emerging excitons are unveiled and discussed. Generally, well-tailored interfacial energy transfer and charge transfer within a 2D heterostructure cause static modulation of the brightness of intralayer excitons. As a special case, dynamically correlated dual-color emission in weakly-coupled bilayers will be introduced, which originates from intermittent interlayer charge transfer. For homobilayers and type Ⅱ heterobilayers, interlayer excitons with electrons and holes residing in neighboring layers are another important topic in this review. Moreover, the overlap of two crystal lattices forms moiré patterns with a relatively large period, taking effect on intralayer and interlayer excitons. Particularly, theoretical and experimental progresses on spatially modulated moiré excitons with ultra-sharp linewidth and quantum emission properties will be highlighted. Moiré quantum emitter provides uniform and integratable arrays of single photon emitters that are previously inaccessible, which is essential in quantum many-body simulation and quantum information processing. Benefiting from the optically addressable spin and valley indices, 2D heterostructures have become an indispensable platform for investigating exciton physics, designing and integrating novel concept emitters.
van der Waals assembly interface interaction interlayer gap twist angle intralayer and interlayer excitons moiré excitons Journal of Semiconductors
2023, 44(1): 011001
Author Affiliations
Abstract
Department of Physics and Engineering Physics, Tulane University, New Orleans, USA
Journal of Semiconductors
2023, 44(1): 010401
光子学报
2022, 51(10): 1017001
1 中国石油大学(北京)理学院,北京 102249
2 中国政法大学法治信息管理学院,北京 102249
缺陷态光子晶体可以用于制作良好的谐振器、偏振器、滤光器等光学器件,具有重要的应用价值。本文发展了光子晶体缺陷态问题的PG有限元界面问题计算方法,有效地处理了各种不同组元体系、几何结构、界面形状、材料属性以及模态的光子晶体缺陷态问题。数值结果表明,二组元结构单点缺陷对带隙的影响较小,只是使局部范围内的波继续传播而产生一条缺陷带,多点缺陷使一些特定范围内的波可以传播而产生多条缺陷带,线缺陷产生的影响较大,可以使整个禁带消失。结合线缺陷与点缺陷,波导结构中的侧点缺陷可以有效地应用于光子晶体阻带内诱导窄通带或在波导的通带内诱导非常窄的阻带。三组元结构引入了不均匀介质、复杂介质形状以及不同几何结构的缺陷态。通过计算与分析发现Ω3区域的介质形状对结果影响比较有限,表面层越不光滑禁带越窄,n型缺陷态在TM模中的高频区域更容易产生禁带。对于TE模来说,n型与v型的缺陷态更容易产生禁带。
光子晶体 缺陷态 多组元 能带结构 PG有限元法 非贴体网格 photonic crystal defective state multi-component energy band structure Petrov-Galerkin finite element method non-body-fitted grid
1 中国电子科技集团公司光电研究院, 天津
2 空军研究院系统工程所, 北京
阐述了一种基于半球环形全景成像的紫外光学系统, 从大视场的需求角度出发, 设计了半球环形的全景成像光学系统, 该系统可以实现对180°(H)×40°(V)空域实现成像覆盖的需求, 系统适用于紫外成像, 由于紫外波段系统材料较少, 为减小系统像差, 在第一片镜片采用了镀膜折返式方式进行设计, 该设计不但实现了扩大系统视场接收范围的能力, 还具备了镜片数量少的特点。所设计的系统体积小, 覆盖面积广, 成像质量高, 有效的实现了环形大视场范围紫外图像获取。
半球 环形全景 紫外图像 half sphere overall view ultraviolet image
燕山大学信息科学与工程学院, 河北省特种光纤与光纤传感重点实验室, 河北 秦皇岛 066004
提出了一种基于银修饰的微腔型光纤表面增强拉曼散射(SERS)探针, 采用湿法检测, 将光纤SERS探针直接放入待测溶液中, 以罗丹明6G(R6G)溶液为探针分子, 对所制备的光纤SERS探针进行远端实验性能研究。 利用氢氟酸化学腐蚀的方法制备了一种微腔型光纤结构, 通过控制氢氟酸的腐蚀时间得到了一系列不同腐蚀时间、 不同微腔长度的光纤结构。 实验研究了光纤结构的微腔长度对光纤SERS探针性能的影响, 以浓度为10-3 mol·L-1的R6G溶液为探针分子, 通过不断地优化纳米银溶胶与R6G溶液的混合顺序及比例, 采用裸光纤微腔结构对混合溶液进行拉曼检测, 发现当混合溶液的混合顺序及比例为先后混合等体积的纳米银溶胶和R6G溶液时, 此时得到的混合溶液的拉曼信号增强性能最佳。 利用得到的混合溶液去寻找拉曼信号增强效果最高时光纤微腔结构的结构参数, 实验结果表明, 在相同的实验条件下, 当光纤放入氢氟酸中腐蚀时间为5 min时, 此时光纤微腔结构的拉曼信号增强效果最佳。 在显微镜下测量的多组腐蚀时间为5 min的光纤, 其微腔长度平均约为81 μm。 对得到的光纤微腔结构, 采用制备过程可控的磁控溅射技术制备了一系列银纳米薄膜/多模光纤(Ag/MMF)的复合材料。 当磁控溅射时间为10 min时, 获得了光纤SERS探针(Ag/MMF-10)。 实验以去离子水配制了不同浓度的R6G溶液, 以不同浓度的R6G溶液为探针分子, Ag/MMF-10探针的远端检测限(LOD)低至10-7 mol·L-1。 该光纤SERS探针拉曼信号的再现性光谱检测中显示各个特征峰的相对标准偏差(RSD)均小于10%。 同时, 该光纤SERS探针对浓度为10-6 mol·L-1的R6G溶液的增强因子(AEF)可高达2.64×106。 实验结果表明所制备的银修饰的光纤SERS基底具有较高的灵敏度和良好的再现性。 因此, 该光纤SERS探针在生物医学检测、 农残化学分析等痕量检测方面有潜在的应用价值。
光纤光学 光纤探针 表面增强拉曼散射 磁控溅射法 罗丹明6G Fiber optics Fiber probes Surface enhanced Raman scattering Magnetron sputtering Rhodamine 6G 光谱学与光谱分析
2021, 41(9): 2800
1 中国电子科技集团公司光电研究院, 天津
2 空军装备部驻天津地区第三军事代表室, 天津
讨论了基于光纤传输的柔性红外光学成像系统设计方法, 采用光学成像前置模块+光纤传像束+光学成像后置模块的分体式布局, 通过合理的优化设计, 实现光学孔径与制冷探测器的高效匹配。该设计方法减轻了伺服转动机构光学负载质量, 压缩了光学负载的外形尺寸, 扩展了光机系统柔性布局的新方式, 通过该设计方法, 配合伺服转动结构, 可实现半球空域内的任意方向成像。
红外光学系统 光纤传像束 柔性 infrared optical system optical fiber beam flexible
中国工程物理研究院 电子工程研究所, 四川 绵阳 621999
故障模式、影响及危害性分析 (FMECA)中基于风险优先数 (RPN)的危害性分析方法, 通常用来识别风险因素, 确定关键故障模式和薄弱环节, 提供决策依据。传统 RPN中评价信息都是确定性信息, 并且没有考虑故障模式的相关性。而在工作实际中, 评价人员由于自身的属性和对评价对象的认识水平的限制, 有时只能给出不确定评价信息, 同时故障模式之间往往存在相关性, 这都会影响最终危害性的分析结果。针对存在的问题, 利用可靠性屋(HoR)来考虑故障模式相关性, 针对三角模糊评价信息采用逼近理想解排序技术 (TOPSIS)开展模糊 RPN评价方法研究。最后结合实际案例, 对不同情况下获得的 RPN值进行比较。仿真结果表明, 考虑故障模式相关性的模糊 RPN评价方法, 可以提高 RPN值的可信度, 为风险决策提供更可靠的依据。
故障模式、影响及危害性分析 风险优先数 故障模式相关性 可靠性屋 三角模糊数 逼近理想解排序技术 Failure Mode Effects and Criticality Analysis Risk Priority Number failure modescorrelation House of Reliability triangular fuzzy number Technique for Order Preference by Similarity to Id 太赫兹科学与电子信息学报
2021, 19(4): 705
