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Unveiling the Potential of Zn-MOF/GO Nanoarchitectures for Highly Sensitive and Stable Ammonia Sensing at Ambient Conditions 揭示Zn-MOF/GO纳米结构在环境条件下高度敏感和稳定的氨传感的潜力
IF 2.2 4区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-10-15 DOI: 10.1007/s11664-024-11506-x
Zakaria M. Ali, Mohamed E. El Sayed, Ahmed Samir, Mohammad N. Murshed

This work reports the synthesis and characterization of a zinc-based metal–organic framework (Zn-MOF) and its nanocomposite with graphene oxide (GO) for room-temperature ammonia (NH3) sensing. The Zn-MOF/GO nanocomposite was prepared via an innovative solvothermal approach and comprehensively characterized using x-ray diffraction, UV–visible spectroscopy, Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy, and thermogravimetric analysis. The nanocomposite demonstrated exceptional NH3 sensing performance at ambient conditions, exhibiting a linear response from 20 ppm to 220 ppm, a significant 13.2% response towards 100 ppm NH3, and rapid response/recovery times of 102/127 s. Notably, the sensor maintained long-term stability, with 12.4% average sensitivity over 50 days. The synergistic effects between GO and Zn-MOF components, coupled with the high surface area and porous structure, contributed to the superior sensing characteristics. A strong linear correlation (R2 = 0.9906) between sensor response and NH3 concentration enabled precise quantitative detection. This study not only introduces a novel material for NH3 sensing but also provides crucial insights into the structure–property relationships governing nanocomposite gas sensors. The findings open new avenues for designing high-performance chemiresistive gas sensors operating at ambient conditions, with potential applications in environmental monitoring and industrial safety.

本研究报告了一种锌基金属有机框架(Zn-MOF)及其与氧化石墨烯(GO)的纳米复合材料的合成与表征,用于室温氨(NH3)传感。Zn-MOF/GO 纳米复合材料是通过创新的溶热法制备的,并利用 X 射线衍射、紫外可见光谱、傅立叶变换红外光谱、拉曼光谱和热重分析对其进行了全面表征。该纳米复合材料在环境条件下表现出卓越的 NH3 传感性能,在 20 ppm 到 220 ppm 的范围内表现出线性响应,对 100 ppm NH3 的响应为 13.2%,快速响应/恢复时间为 102/127 s。GO 和 Zn-MOF 成分之间的协同效应,再加上高表面积和多孔结构,造就了其卓越的传感特性。传感器响应与 NH3 浓度之间具有很强的线性相关性(R2 = 0.9906),从而实现了精确的定量检测。这项研究不仅介绍了一种新型的 NH3 传感材料,还对纳米复合气体传感器的结构-性能关系提供了重要的见解。这些发现为设计在环境条件下工作的高性能化学电阻式气体传感器开辟了新途径,有望应用于环境监测和工业安全领域。
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引用次数: 0
One-Step Electrochemical Modification of Pencil Graphite Electrode with Poly(DPASA-co-VP)-RuO2NPs and its Application for the Trace Analysis of Sumatriptan 聚(DPASA-co-VP)-RuO2NPs一步电化学修饰铅笔石墨电极及其在苏马曲坦痕量分析中的应用
IF 2.2 4区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-10-09 DOI: 10.1007/s11664-024-11509-8
Mansoureh Lalei, Kobra Zarei

A straightforward and one-step modification of the pencil graphite electrode was performed using co-polymerization of diphenyl amine-4-sulfonic acid (DPASA) sodium salt, and 4-vinylpyridine (VP), and also simultaneous formation of ruthenium dioxide nanoparticles (poly(DPASA-co-VP)-RuO2 NPs/PGE). The subsequent step involved the application of the altered electrode to examine the quantity of sumatriptan by employing a highly sensitive adsorptive differential pulse voltammetric method. The modified electrode was thoroughly characterized through the utilization of cyclic voltammetry (CV), field-emission scanning electron microscopy (FESEM), and electrochemical impedance spectroscopy (EIS). Under optimized conditions, the concentration of sumatriptan was determined within two linear ranges: 1.0–50.0 nM and 50.0–5000.0 nM, with a detection limit of 0.03 nM. Ultimately, the suggested approach was employed to gauge the sumatriptan content in tablet and urine samples, revealing that this method possesses the requisite levels of accuracy and precision.

用二苯胺-4-磺酸钠盐(DPASA)和4-乙烯基吡啶(VP)共聚合对铅笔石墨电极进行了直接的一步改性,并同时形成了二氧化钌纳米粒子(聚(DPASA-co-VP)-RuO2 NPs/PGE)。随后的步骤涉及应用改变电极,采用高灵敏度的吸附差分脉冲伏安法检查舒马曲坦的量。利用循环伏安法(CV)、场发射扫描电镜(FESEM)和电化学阻抗谱(EIS)对改性电极进行了全面表征。在优化条件下,舒马曲坦的浓度测定在1.0 ~ 50.0 nM和50.0 ~ 5000.0 nM两个线性范围内,检出限为0.03 nM。最后,该方法被用于测定片剂和尿样中的舒马曲坦含量,表明该方法具有必要的准确度和精密度。
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引用次数: 0
Preparation and Properties of High-Temperature Transient Thin-Film Thermopile Heat Flux Sensor 高温瞬态薄膜热电堆热流传感器的制备与性能研究
IF 2.2 4区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-10-09 DOI: 10.1007/s11664-024-11476-0
Shanghang Xie, Jin Zhu, Hongchuan Jiang, Xiaohui Zhao, Baorui Liu, Zhouxia Jia

The thermopile of the sensor consists of 192 pairs of Pt-PtRh10 thermocouples with length 1 mm and width 100 μm in serpentine series were deposited on Al2O3 ceramic substrates by a photolithography coating process. The thermal resistance layers with the proposed low thermal conductivity feature a meshed cavity structure, with four thermal resistance layers spaced over the thermopile contacts to enhance the sensitivity of the sensor. Calibration of the sensor’s sensitivity was performed by a flat-plate radiative heat flux device, while its response time was measured by a pulsed laser. Finally, the sensor’s performance in an actual application environment was simulated using a wind tunnel. The results showed that the thin-film heat flux sensor can operate in environments ranging from 200°C to 1500°C, with a sensitivity of 0.03067 m2 μV/W, the maximum relative error was 8.5% with an average response time of 12.7 μs. The sample exhibited stable performance during wind tunnel testing, responding quickly to changes in heat flux.

Graphical Abstract

该传感器的热电堆由192对长1 mm、宽100 μm的Pt-PtRh10热电偶组成,采用光刻镀膜工艺沉积在Al2O3陶瓷衬底上。所提出的低导热系数的热阻层具有网状腔结构,在热电堆触点上间隔有四个热阻层,以提高传感器的灵敏度。利用平板辐射热通量仪标定传感器的灵敏度,利用脉冲激光测量传感器的响应时间。最后,利用风洞模拟了传感器在实际应用环境中的性能。结果表明,薄膜式热流通量传感器可在200 ~ 1500℃的工作环境中工作,灵敏度为0.03067 m2 μV/W,最大相对误差为8.5%,平均响应时间为12.7 μs。在风洞测试中,样品表现出稳定的性能,对热通量的变化反应迅速。图形抽象
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引用次数: 0
Design and Optimization of a Piezoelectric Acoustic Sensor for Fluid Leak Detection Applications 用于流体泄漏检测的压电声传感器的设计与优化
IF 2.2 4区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-10-08 DOI: 10.1007/s11664-024-11504-z
Mohini Sawane, Mahanth Prasad, Rajesh Kumar

Pipeline leaks are known to frequently occur in chemical processing and urban gas pipes, which can lead to equipment damage, explosions, and potentially serious injuries. A design of a piezoelectric acoustic sensor for fluid leak detection is proposed in this work. The low-frequency acoustic leak signals that travel through the fluid in a pipeline can be detected using a piezoelectric acoustic sensor. The design and simulation of sensor is done using COMSOL Multiphysics software. The sensor specification is used to guide the choice of materials and optimization of geometry. The simulated results show the characteristics of transient response using a nondestructive detection approach at various leakage rates. The recommended detection method's ability to detect leak signals with tolerable accuracy is shown through simulated results. The designed sensor can be used for both long-term leak monitoring and short-term safety evaluations. The simulated sensitivity of 191 µV/m at 27.46 kHz resonance frequency is achieved by optimizing device design. The maximum deflection at the center is 2.37 nm. The total electric energy generated at 1 N of force and 5 Hz frequency is 8 nJ.

在化工和城市燃气管道中,管道泄漏是经常发生的事故,可能导致设备损坏、爆炸和潜在的严重伤害。本文提出了一种用于流体泄漏检测的压电声传感器的设计。通过使用压电声学传感器,可以检测到通过管道流体传播的低频声泄漏信号。利用COMSOL Multiphysics软件对传感器进行了设计和仿真。传感器规格用于指导材料的选择和几何结构的优化。仿真结果显示了不同泄漏率下无损检测方法的瞬态响应特性。通过模拟结果表明,所推荐的检测方法能够以可容忍的精度检测泄漏信号。所设计的传感器既可用于长期泄漏监测,也可用于短期安全评估。通过优化器件设计,在27.46 kHz谐振频率下实现了191µV/m的模拟灵敏度。中心的最大偏转为2.37 nm。在1n的力和5hz的频率下产生的总电能为8nj。
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引用次数: 0
Effect of Mn Doping on the Morphological and Optical Properties of Ba0.92Sr0.08Ti1-xMnxO3 Materials for Microwave Device Applications 掺杂锰对用于微波器件的 Ba0.92Sr0.08Ti1-xMnxO3 材料的形态和光学特性的影响
IF 2.2 4区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-10-07 DOI: 10.1007/s11664-024-11418-w
Mikanshi Chaudhary, Sheela Devi, Sukhdeep Kaur, Shilpi Jindal

In this work, we investigated the impact of Mn substitution on the morphological, structural, and optical properties of barium strontium titanate (BST) with the formula Ba0.92Sr0.08Ti1−xMnxO3 (x = 0.00, 0.10, 0.20) fabricated using the solid-state reaction technique. The morphological and structural properties were studied using scanning electron microscopy (SEM) and x-ray diffraction (XRD). The optical properties of the samples were analyzed using photoluminescence (PL), Fourier transform infrared (FTIR), and Raman spectroscopy. SEM micrographs displayed nearly spherical grains. The phase formation, lattice structure, crystallite size (D), strain (ε), and dislocation density (δ) of the Mn-doped BST ceramics were examined from the recorded XRD patterns using the Scherrer and Williamson–Hall (W–H) models, which showed that the crystallite size increased and the lattice strain and dislocation density decreased with increasing doping concentrations. FTIR results for the pristine sample of BST revealed that the absorption peak at a wavenumber of 470 cm−1 was shifted to 1250 cm−1 for Mn-doped BST concentrations. The Raman results indicated that the number of modes decreased with the increase in the Mn2+ concentrations. PL spectra showed an emission band centered at 60–659 nm, indicating redshift behavior. The analysis using XRD, SEM, FTIR, and Raman spectroscopy revealed that the concentration x = 0.20 is appropriate for use in microwave devices and other electro-optical applications.

在这项工作中,我们研究了锰取代对钛酸锶钡(BST)的形态、结构和光学性能的影响,该BST的分子式为Ba0.92Sr0.08Ti1−xMnxO3 (x = 0.00, 0.10, 0.20)。利用扫描电子显微镜(SEM)和x射线衍射仪(XRD)研究了材料的形貌和结构特性。利用光致发光(PL)、傅里叶变换红外(FTIR)和拉曼光谱分析了样品的光学性质。SEM显微图显示晶粒接近球形。采用Scherrer和Williamson-Hall (W-H)模型分析了mn掺杂BST陶瓷的相形成、晶格结构、晶粒尺寸(D)、应变(ε)和位错密度(δ),结果表明,随着掺杂浓度的增加,晶粒尺寸增大,晶格应变和位错密度减小。原始BST样品的FTIR结果显示,在掺杂mn的BST浓度下,波数为470 cm−1的吸收峰移到了1250 cm−1。拉曼结果表明,随着Mn2+浓度的增加,模式数量减少。PL光谱显示出以60 ~ 659 nm为中心的发射带,显示出红移行为。通过XRD, SEM, FTIR和Raman光谱分析表明,x = 0.20的浓度适合用于微波器件和其他电光应用。
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引用次数: 0
Investigation of Dielectric and Piezoelectric Properties of Polyvinylidene Fluoride Films Reinforced with Anatase Phase Titanium Dioxide for Pressure Sensing 锐钛矿相二氧化钛增强聚偏氟乙烯薄膜的介电和压电性能研究
IF 2.2 4区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-10-07 DOI: 10.1007/s11664-024-11499-7
Krishna Tewatia, Anuradha Sharma, Sohan Lal, Sridharbabu Yarramaneni, Tanuj Kumar, Arun Kumar

In the present study, anatase phase titanium dioxide (A-TiO2)-reinforced polyvinylidene fluoride (PVDF) nanocomposite films are synthesized by the solvent casting method. The electroactive phase, dielectric, and piezoelectric properties are studied for A-TiO2 nanoparticles at 0.8 wt.%, 1.6 wt.%, 2.4 wt.%, 3.2 wt.%, and 4.0 wt.% content in the PVDF matrix. X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy are used to assess the structural properties and the enhancement in the electroactive β phase, respectively. The β phase is found to improve up to 77%. Atomic force microscopy (AFM) shows that the roughness of the films increases with an increase in the amount of reinforcement. The dielectric constant (ε′) and dissipation factor are found to vary with filler weight percentage and frequency. The dielectric constant increases to 24.45 for 2.4 wt.% of A-TiO2 nanoparticles. The piezo-response increases significantly from 0.6 V to 1.3 V for the nanocomposite in comparison to pure PVDF films. The results of the current study show numerous potential applications in energy-harvesting pressure sensors.

本研究采用溶剂铸造法制备了锐钛矿相二氧化钛(A-TiO2)增强聚偏氟乙烯(PVDF)纳米复合薄膜。研究了A-TiO2纳米粒子在PVDF基体中含量为0.8 wt.%、1.6 wt.%、2.4 wt.%、3.2 wt.%和4.0 wt.%时的电活性相、介电和压电性能。利用x射线衍射(XRD)和傅里叶变换红外光谱(FTIR)分别评价了结构性能和电活性β相的增强。β相提高了77%。原子力显微镜(AFM)结果表明,膜的粗糙度随增强量的增加而增加。发现介电常数ε′和耗散系数随填料的重量百分比和频率而变化。当A-TiO2纳米粒子质量分数为2.4 wt.%时,介电常数增加到24.45。与纯PVDF膜相比,纳米复合材料的压电响应从0.6 V显著增加到1.3 V。目前的研究结果显示了能量收集压力传感器的许多潜在应用。
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引用次数: 0
Study of Di-/Ferro-/Piezoelectric Properties of Sm3+-Doped ZnO Nanoparticles Sm3+掺杂ZnO纳米颗粒的双/铁/压电性能研究
IF 2.2 4区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-10-07 DOI: 10.1007/s11664-024-11480-4
Radha Verma, Sahil Goel, Komal Verma, Krishan Kant, Rajesh Kumar, Maneesha Garg, Rashi Gupta

Pristine ZnO and Sm-doped ZnO nanoparticles were synthesized using a wet chemical co-precipitation technique. The morphological and structural characteristics of pristine and Sm-doped ZnO were studied by field-emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD) techniques. Increases in lattice parameters, interplanar spacing, and volume was observed from the XRD patterns compared to its JCPDS card. Crystallite size, dislocation density, deformation stress, lattice strain, and energy density for both pristine and Sm-ZnO nanoparticles were calculated using Scherrer and Williamson–Hall (W–H) methods. An energy bandgap reduction was observed in the Sm-doped ZnO (Eg ~ 2.7 eV), which played a crucial role in explaining the increased leakage currents in Sm-ZnO. The Sm-doped ZnO nanoparticles exhibited a remnant polarization (Pr ~ 0.163 µC/cm2) and a coercive field (Ec ~ 25.33 kV/cm). Current–voltage (I–V) characteristics show maximum current generated on applying varying voltages (Vmax = 40 V, Imax =  ~600 μA). Frequency- and temperature-dependent dielectric studies were conducted to examine the change in the values of the dielectric constant and dielectric loss with the variation in frequency and temperature. The Sm-doped ZnO-based nanogenerator generated an output voltage ~ 400 mV at tapping force of ~ 0.02 kgf, which makes it a prominent candidate for self-powered devices.

Graphical Abstract

采用湿化学共沉淀法合成了原始氧化锌和sm掺杂氧化锌纳米颗粒。采用场发射扫描电镜(FESEM)和x射线衍射(XRD)技术研究了原始ZnO和sm掺杂ZnO的形貌和结构特征。与JCPDS卡相比,从XRD图中可以观察到晶格参数、面间距和体积的增加。采用Scherrer和Williamson-Hall (W-H)方法计算了原始和Sm-ZnO纳米颗粒的晶粒尺寸、位错密度、变形应力、晶格应变和能量密度。在sm掺杂的ZnO (Eg ~ 2.7 eV)中观察到能量带隙减小,这是Sm-ZnO中泄漏电流增加的关键原因。sm掺杂ZnO纳米粒子具有残余极化(Pr ~ 0.163µC/cm2)和矫顽力场(Ec ~ 25.33 kV/cm)。电流-电压(I-V)特性显示了施加不同电压时产生的最大电流(Vmax = 40 V, Imax = ~600 μA)。进行了频率和温度相关的介电研究,以检查介电常数和介电损耗值随频率和温度变化的变化。在攻丝力为~ 0.02 kgf的情况下,smo掺杂zno基纳米发电机的输出电压为~ 400 mV,是自供电器件的理想选择。图形抽象
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引用次数: 0
Study of Dielectric Properties of Binary Mixtures of n-Octanol and N,N-Dimethylformamide in Lower Microwave Radiation 正辛醇和N,N-二甲基甲酰胺二元混合物在低微波辐射下的介电性能研究
IF 2.2 4区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-10-07 DOI: 10.1007/s11664-024-11505-y
N. A. Chaudhary, S. P. Patel, C. R. Vaja, N. K. Acharya, V. A. Rana, A. N. Prajapati

The complex permittivity spectra of binary mixtures (0.0 → 1.0) of n-octanol and N,N-dimethylformamide (DMF) were obtained in the lower microwave radiation region using a vector network analyzer (VNA) at 293.15 K The complex permittivity spectra of n-octanol with DMF and binary mixtures were fitted in a dielectric relaxation model (Havriliak–Negami) to obtain the static dielectric constant (ε0) and relaxation time (τ). Complex nonlinear least-squares (CNLS) fitting was used to fit the complex dielectric spectra. The nonlinear variation in ε0 and τ against DMF concentration in binary mixtures of n-octanol + DMF indicated hetero-molecular interaction between participating molecular species. The variation in the dielectric constant and dielectric loss against concentration is discussed in light of their dependence on frequency. The microwave radiation heating parameters including power reflected (pr), power transmitted (pt), and penetration depth (dp) were investigated at general purpose and commercial microwave radiation of 2.45 GHz, respectively.

Graphical Abstract

利用矢量网络分析仪(VNA)在293.15 K下获得了正辛醇与N,N-二甲基甲酰胺(DMF)二元混合物(0.0→1.0)的复介电常数谱。将正辛醇与DMF及二元混合物的复介电常数谱拟合到介电弛豫模型(Havriliak-Negami)中,得到了其静态介电常数(ε0)和弛豫时间(τ)。采用复非线性最小二乘(CNLS)拟合方法拟合复介质谱。在正辛醇+ DMF二元混合物中,ε0和τ随DMF浓度的非线性变化表明参与分子种之间存在异分子相互作用。从介电常数和介电损耗与频率的关系出发,讨论了介电常数和介电损耗随浓度的变化。研究了微波辐射加热参数,包括反射功率(pr)、透射功率(pt)和穿透深度(dp),分别在普通微波和2.45 GHz商用微波辐射下进行。图形抽象
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引用次数: 0
Effect of Increasing Donor Units in Dn–σ–A (n = 1, 2, …5) Type Single-Molecule Diodes Containing Oligomers of 3,4-Ethylenedioxythiophene as Electron Donor: A DFT Study 以3,4-乙烯二氧噻吩低聚物为电子给体的Dn -σ-A (n = 1,2,…5)型单分子二极管中增加给体单位的影响:DFT研究
IF 2.2 4区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-10-07 DOI: 10.1007/s11664-024-11483-1
Tabish Rasheed, Sandra Winnie Angelo, Anubhav Raghav

The field of molecular electronics focuses mainly on the development of novel organic molecules that have the ability to achieve certain specific electronic functionalities due to their unique structural design and properties. One of the most exciting applications of this discipline is the organic single-molecule diode (OSMD), which can deliver efficient current rectification in electronic circuits displaying characteristics identical to those of silicon-based conventional inorganic diodes. The present study showcases newly designed organic molecular systems (OMSs) which can function as OSMDs. The general design of subject OMSs is based on the Dnσ–A (n = 1, 2, …5) structural model, which adopts the OSMD scheme proposed by Aviram and Ratner in 1974. In these OMSs, Dn, σ, and A denote oligomeric electron donor, σ-bridge, and electron acceptor units, respectively. n represents the number of 3,4-ethylenedioxythiophene compounds which are joined together to form the oligomeric electron donor unit. The electron donor and acceptor moieties are organic compounds which have an electron-donating and electron-accepting nature, respectively. The σ-bridge corresponds to a σ-bonded organic compound that separates Dn and A units. The properties of all subject OMSs were simulated using Gaussian 16W quantum chemistry software. Calculations were conducted using density functional theory and the B3LYP hybrid functional along with the 6-311G(d,p) basis set. Detailed investigations were carried out to determine whether subject OMSs have the ability to function as OSMDs. Forward and reverse bias characteristics due to the simulated application of an external electric field on subject OMSs were probed using data obtained for frontier orbitals, dipole moments, and natural bond orbital charges. Also, the effect of an increasing number of donor units was systematically studied by comparative analysis. Molecular electrostatic potential maps were developed for subject OMSs to determine the electron-donating capability of different donor units. Overall, a general trend of increasing efficiency of rectification was observed with an increasing number of donor units in subject OMSs.

Graphical Abstract

分子电子学领域主要关注新型有机分子的发展,这些有机分子由于其独特的结构设计和性质而具有实现某些特定电子功能的能力。该学科最令人兴奋的应用之一是有机单分子二极管(OSMD),它可以在电子电路中提供有效的电流整流,显示与硅基传统无机二极管相同的特性。本研究展示了新设计的具有osmd功能的有机分子系统(OMSs)。主题oms的总体设计基于Dn -σ-A (n = 1,2,…5)结构模型,采用1974年Aviram和Ratner提出的OSMD方案。在这些oms中,Dn、σ和A分别表示低聚电子给体、σ桥和电子受体单位。N表示连接在一起形成低聚电子给体单元的3,4-乙烯二氧噻吩化合物的数目。电子给体和电子受体部分是分别具有给电子和接受电子性质的有机化合物。σ-桥对应于一个σ键有机化合物,它将Dn和a单元分开。采用高斯16W量子化学软件模拟所有被试oms的性质。利用密度泛函理论和B3LYP混合泛函以及6-311G(d,p)基集进行计算。进行了详细的调查,以确定受试者oms是否具有作为osmd的功能。利用前沿轨道、偶极矩和自然键轨电荷的数据,研究了模拟外加电场作用于被试oms的正向和反向偏置特性。通过比较分析,系统地研究了供体单位数量增加的影响。建立了分子静电势图,以确定不同给电子单元的给电子能力。总的来说,随着研究对象oms中供体单位数量的增加,观察到整流效率提高的总体趋势。图形抽象
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引用次数: 0
High-Sensitivity Flexible Strain Sensor with the Inverted Pyramid Microstructure Array Based on Stress-Induced Regular Linear Cracks 基于应力诱发规则线性裂纹的倒金字塔微结构阵列高灵敏度柔性应变传感器
IF 2.2 4区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-09-28 DOI: 10.1007/s11664-024-11474-2
Ming Chen, Zhi Ding, Weidong Wang, Baoyin Hou, Lufeng Che

Crack-based flexible strain sensors inspired by a spider’s slit organs have exhibited high sensitivity. However, the sensitivity of crack-based sensors can be negatively affected by cracks with random and undirected features. In this work, we fabricated a high-sensitivity flexible strain sensor with regular linear microcracks induced by stress concentration. The sensor consists of a polydimethylsiloxane (PDMS) flexible substrate with an inverted pyramid array and a conductive metal layer of Ti/Au film that was sputtered on the substrate surface. When the sensor was stretched, stress concentrations will occur near the inverted pyramids, inducing the generation of linear microcracks perpendicular to the stretching directions between the adjacent inverted pyramids. The testing results demonstrated that the sensor has a high sensitivity (a gauge factor of 9327 in the strain range of 7.6–10%), a wide working range (0–10% strain), and a fast response/recovery time (77/82 ms). These features enable the sensor to have potential applications in health monitoring and human–computer interaction, such as finger motion recognition and neck bending direction detection.

受蜘蛛的裂隙器官启发,基于裂纹的柔性应变传感器显示出高灵敏度。然而,基于裂纹的传感器的灵敏度会受到随机和无向特征的裂纹的负面影响。在这项工作中,我们制作了一个高灵敏度的柔性应变传感器,该传感器具有由应力集中引起的规则线性微裂纹。该传感器由具有倒金字塔阵列的聚二甲基硅氧烷(PDMS)柔性衬底和溅射在衬底表面的导电金属层Ti/Au薄膜组成。当传感器被拉伸时,在倒金字塔附近会出现应力集中,导致在相邻倒金字塔之间产生垂直于拉伸方向的线性微裂纹。测试结果表明,该传感器具有高灵敏度(7.6 ~ 10%应变范围内的应变系数为9327)、宽工作范围(0 ~ 10%应变)和快速响应/恢复时间(77/82 ms)。这些特点使传感器在健康监测和人机交互方面具有潜在的应用前景,如手指运动识别和颈部弯曲方向检测。
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Journal of Electronic Materials
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