INSTRUMENTATION SCIENCE & TECHNOLOGY
·
2016
·
IF 0.525
Jie Zhang,Panpan Guan,Wei Li,Ziqin Shi,Hui Zhai
A polyaniline/silver nanocomposite was prepared through in situ polymerization and used to determine formaldehyde vapor. The prepared nanocomposite was characterized by scanning electron microscopy, transmission electron microscopy, and X-ray diffraction. The responses of the nanocomposite were much higher than using pure polyaniline. The nanocomposite exhibited good linearity versus gas concentration with a reproducible response. The limit of detection for the 25% silver nanocomposite was approximately 1.24 ppm.
研究领域:
材料科学
·
环境监测
·
化学传感器
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Jin Jia,Yan Peng,Kai Ke,Zheng-Ying Liu,Wei Yang
Flexible electronics capable of acquiring high-precision signals are in great demand for the development of the internet of things and intelligent artificial. However, it is currently a challenge to simultaneously achieve high signal linearity and sensitivity for stretchable resistive sensors over a wide strain range toward advanced application scenarios requiring high signal accuracy, e.g., sophisticated physiological signal discrimination and displacement measurement. Herein, a film strain sensor, which has an electrical and mechanical dual heterostructure, was fabricated via a direct near-field electrowriting and molecule-guided in situ growth of silver nanoparticles with different concentrations on high-modulus polystyrene domains and low-modulus styrene–butadiene copolymers with a salami-like morphology. Mechanism analyses from both theoretical and experimental investigations reveal that the salami-like heteromodulus microstructure regulates microcrack propagation routes, while the heteroconductivity changes the electron transport paths and amplifies the resistance increase during crack propagation. Therefore, the as-designed strain sensor shows a linear resistive response within ca. 70% strain with a gauge factor of 25, unveiling a simple and scalable strategy for trading off signal linearity and sensitivity over a wide strain range for the fabrication of high-performance linear strain sensors.
研究领域:
材料科学
·
柔性电子学
✓ 已验证
DOI
PubMed
高影响因子
Advanced Materials Technologies
·
2023
·Vol. 8
·期 12
·2202008
·
IF 6.8
Junhao Shen,Yixin Guo,Tianyu Fu,Shengping Yao,Jun Zhou,Dongfeng Wang,Hengchang Bi,Shaohua Zuo,Xing Wu,Fuwen Shi,Jinchun Jiang,Junhao Chu
Biomimetic sensors that mimic human skin perception have received enormous attention in human motion detection and human–robot interaction. However, the narrow working range limits the response linearity of mechanical stimuli. Especially the ultrafast active response is needed to detect and react to the potential collision. Inspired by the skin structure, a hierarchical structure with poly(ethylene oxide)-based ionic conductive polymer electrolytes and polyurethane is designed. The observable synergistic sensing mechanism works throughout the compression process, providing the device with a continuous change in electrical response with excellent linearity ( R 2 = 0.998) over a broad range (100 Pa–500 kPa). The compressive deformation and corresponding mechanical behavior of hierarchical structures are dynamically and simultaneously observed by using in situ electron microscopy at the atomistic scale. Furthermore, a biomimetic skin is established in the human–robot interaction system, which can provide active and efficient collision avoidance.
研究领域:
材料科学
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生物医学工程
·
机器人学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2013
·Vol. 130
·期 3
·2056-2061
·
IF 1.395
Teng Fei,Hongran Zhao,Kai Jiang,Xing Zhou,Tong Zhang
A class of humidity sensors with switching property based on several hydrophilic polymers [poly( N -vinyl-2-pyrrolidone) (PVP), poly(vinyl alcohol) (PVA), and hydroxyethyl cellulose (HEC)] were researched. These polymers were selected as the sensing materials because the polar groups in the molecules (amide, hydroxyl, and ether bond) could interact with water molecules. The sensors all show nonlinear response to relative humidity (RH) under AC voltage. The impedances of the sensors remain almost unchanged at low RH and decrease sharply at certain humidity (about 75, 65, and 55% RH for PVP, PVA, and HEC sensors, respectively). The switching points and sensitivities of the sensors could be adjusted by changing the operating frequency, polymer blending, or doping with hydrophilic materials. The complex impedances of the sensors demonstrate that the electronic contribution is dominant at low RH, and the ions make a significant contribution for increasing RH levels. The different sensing properties of the polymers are attributed to their different hydrophilic properties and ionic contributions at high RH. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 2056–2061, 2013
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 35
·25852-25864
·
IF 3.9
Renzhong Xue,Xiaosong Liu,Kun Yang,Xiang Zhu
In this study, Cd1−xNaxCu3Ti4O12 (x = 0, 0.02, 0.04, 0.06, and 0.08) ceramics were prepared via a solid-state method. The phase composition, microstructure, and defect characteristics as well as optical, dielectric, and nonlinear properties of the ceramics were systematically studied. A CuO second phase was detected in doped samples. Grain boundary precipitates, Na with a low melting point, and oxygen and cation vacancies together caused the grain size to first increase and then decrease with an increase in the Na+ doping amount. The abundant emerging cation vacancies with an increase in Na+ content led to a decrease in the optical energy band. The sample with x = 0.04 exhibited the highest ε′ value (∼35 800) due to its largest grain size. Moreover, it possessed a lower tan δ (∼0.053) at 10 kHz, which was attributed to the multiplication of insulating grain boundaries. The huge dielectric constant originated from Maxwell–Wagner polarization at low frequencies and followed the internal barrier effect model. The lowest tan δ (∼0.037) and optimal nonlinear properties (α = 3.66 and Eb = 3.82 kV cm−1) were obtained in the sample with x = 0.08, which were associated with its highest grain boundary resistance and barrier height. Electric modulus data proved that dielectric relaxation at low frequencies was associated with grain boundaries. Dielectric anomalies in the high temperature range were attributed to oxygen vacancies.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Jin Jia,Jun-Hong Liu,Shan Wang,Xiang-Jun Zha,Kai Ke,Zheng-Ying Liu,Petra Pötschke,Ming-Bo Yang,Wei Yang
Wearable strain sensors with high sensitivity and linear resistance signal response to strain are urgently demanded for human–machine interface, which can be tuned by introducing uneven surface mechanics distribution onto fiber surfaces via structural heterogeneity for fibrous elastomer fiber mat sensors. Yet it is still of great challenge to build micro- or nano-scale heterogeneous structures on fiber surfaces in a facile and scalable way without using templates. Herein, we report a plastic nanosphere-decorated elastomer fiber mat strain sensor with a zoned surface strain energy release characteristic, designed based on analysis of material match and structural mechanics. Surface mechanics analysis confirms that the as-designed sensor shows a controllable strain energy release area, significantly improving sensing stability thanks to effective restriction of micro-crack propagation in conductive pathways. In particular, fibrous mat sensor with high-density nanospheres shows very low fluctuation in strain sensitivity variation (±0.05 for strain ≤ 30 %), i.e., good linearity in the resistance response to strain, while that for the control sensor is ± 10.0 for strain ≤ 16 %. Such a fiber mat strain sensor can not only be applied for real-time sensing of object deformations for human–machine interface and intelligent control, but also in hydrophobic porous elastomeric packaging materials and triboelectric devices.
研究领域:
材料科学
·
传感器技术
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2022
·
IF 18.027
Jin Jia,Yan Peng,Xiang-Jun Zha,Kai Ke,Rui-Ying Bao,Zheng-Ying Liu,Ming-Bo Yang,Wei Yang
Wearable strain sensors have huge potential for applications in healthcare, human–machine interfacing, and augmented reality systems. However, the nonlinear response of the resistance signal to strain has caused considerable difficulty and complexity in data processing and signal transformation, thus impeding their practical applications severely. Herein, we propose a simple way to achieve linear and reproducible resistive signals responding to strain in a relatively wide strain range for flexible strain sensors, which is achieved via the fabrication of Janus and heteromodulus elastomeric fiber mats with micropatterns using microimprinting second processing technology. In detail, both isotropic and anisotropic fiber mats can turn into Janus fiber mats with periodical and heteromodulus micropatterns via controlling the fiber fusion and the diffusion of local macromolecular chains of thermoplastic elastomers. The Janus heterogeneous microstructure allows for stress redistribution upon stretching, thus leading to lower strain hysteresis and improved linearity of resistive signal. Moreover, tunable sensing performance can be achieved by tailoring the size of the micropatterns on the fiber mat surface and the fiber anisotropy. The Janus mat strain sensors with high signal linearity and good reproducibility have a very low strain detection limit, enabling potential applications in human–machine interfacing and intelligent control fields if combined with a wireless communication module.
研究领域:
材料科学
·
柔性电子
·
生物医学工程
✓ 已验证
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2024
·
IF 4.1
Yamin Liu,Changxin Chen,Di Chen,Jianmin Miao,Daxiang Cui,Jiajie Yu,Yiping Guo,Qichao Li
Miniaturized wearable electronic devices with strain sensors as core sensing elements hold significant applications in health monitoring and human-machine interaction. However, it remains a challenge to develop strain sensors with optimal response linearity, a wide detection range, and stability. In this study, to satisfy the above requirements, we construct high-performance wearable strain sensors (rGO-CNTOH@PSE) by a strategy of hybridizing conductive fillers with stretchable substrates. In detail, a synergistic conductive network is developed by adopting OH-containing carbon nanotube (CNTOH) and reduced graphene oxide (rGO) fillers with an appropriate mass ratio. After the network is integrated into a porous silicone elastomer substrate formed by the salt templating method, the developed strain sensor exhibits distinct resolution, consistent repeatability, and superior response linearity across a wide strain detection range of 0.3–303.03 %. Furthermore, the sensor also maintains good response stability over 15000 cycles of strain. We also demonstrate that this strain sensor showing outstanding exceptional detection performance has the capability for full-range human motion detection. A wireless smart electronic glove is developed based on the sensor, which can accurately recognize gesture movements and control a bionic robotic hand to replicate human hand actions, offering the potential for replacing manual tasks (such as, grasping in hazardous environments) in the future.
研究领域:
材料科学
·
生物医学工程
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Xiaohui Leng,Dan Luo,Zongxiang Xu,Fei Wang
Graphene oxide (GO) and its derivatives have been applied to the humidity sensing area in recent years due to its abundant hydrophilic functional groups, and proved to be ultrasensitive to the humidity changing. But the stability of the sensors is always an obstacle to their application. Besides, the long-term linearity is seldom studied. In this work, diamine modified GO (MGO) has been synthesized and mixed with Nafion polymer to form a hybrid film, and applied to the humidity sensors. We have applied two measurement methods by either fitting of the impedance spectra to extract charge transfer resistance (R ct ) or measurement of the impedance under a certain frequency, to evaluate the response to the relative humidity (RH). Both MGO and its composite show good sensitivity to the RH under the two testing methods The R ct shows good linearity at the full testing RH range even after two months, while the impedance under a certain frequency can’t keep the linear response to the RH after certain period of time. The addition of Nafion decreases the R ct and increases the sensitivity of MGO based sensor. Linearity of the sensor is improved by the combination of MGO and Nafion. Long-term testing results show the linearity of the composite sensors changes over time but always keeps a better linearity than the pure MGO sensor.
研究领域:
材料科学
·
传感技术
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2019
·Vol. 9
·期 2
·140
·
IF 4.034
Wenjuan Li,Junhuai Xiang,Dandan Men,Honghua Zhang
A novel glucose sensor was reported that consisted of two-dimensional (2D) Au nanosphere arrays and glucose-responsive hydrogel film. This sensor exhibited an intense diffraction signal and an obvious diffraction color on a quartz slide due to the strong diffraction intensity of the Au nanosphere arrays. Thus, glucose was detected via the variation of diffraction wavelength and diffraction color, without a high reflective mirror. In addition, by introducing poly(vinyl alcohol) (PVA) to crosslink the phenylboronic acid (PBA)-modified hydrogel film, the diffraction wavelength of the 2D Au nanosphere arrays/hydrogel composite film shifted in the same direction in high ionic strength condition. In particular, it showed a nearly linear red-shift when the glucose concentration increased from 0 mM to 20 mM. Moreover, this glucose sensor displayed good reproducibility. The nearly linear response and good reproducibility were highly helpful for improving practical application of this glucose sensor.
研究领域:
生物医学工程
·
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2020
·Vol. 20
·期 5
·2705-2712
·
IF 1.134
Luk Hsiang-Ning,Chen Yi-Hsin,Hsieh Chia-Ying,Han Yan Wei,Wu Ren-Jang,Chavali Murthy
A novel sensing material of cobalt oxide-bismuth phosphate (Co3O4–BiPO4) was prepared by the hydrothermal method. Thus prepared sensing material was characterized by X-ray diffraction analysis (XRD) and transmission electron microscopy (TEM). The
sensor was used for the determination of epinephrine by using modified Co3O4–BiPO4 on glassy carbon electrode (GCE). The cyclic voltammetry (CV) and differential pulse voltammetry (DPV) methods showed a wide linear response to a concentration range, from
1.71 to 55.00 μM, and the epinephrine detection limit for this sensing system was found to be 1.334 μM. The Co3O4–BiPO4 electrode has very high selectivity towards the detection of epinephrine supported by an interference test. The
epinephrine sensor seems very advantageous for future clinical health and medical sectors.
研究领域:
分析化学
·
生物医学工程
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2024
·
IF 3.8
Liu Yang,Shuang Wang,Xiaolong Li,Weimin Wang,Fuxing Xu,Chuan-Fan Ding
B-complex vitamins are essential micronutrients that maintaining health, and provide (individually/simultaneously) many important biological actions in organism. Therefore, sensitive, reliable analytical method to determine B-complex vitamins simultaneously in actual samples is significant. Conventional analytical methods for vitamins analysis are usually labor-intensive, time-consuming and mostly do not allow the simultaneous determination. Few papers have been published on capillary electrophoresis-mass spectrometry (CE-MS) analysis of individual vitamin B or B-complex vitamins. Microchip capillary electrophoresis (ME) offers less consumption of background electrolyte and reagents than CE, and fast separation as having several channels for high-throughput. ME based on ZipChip integrates sample injection, electrophoretic separation, and ESI functions into one platform, herein, for the first time, in this paper, the ME-MS based on ZipChip platform was investigated and demonstrated preliminarily a significant improvement over existing techniques. Because: the ME-MS method has a linear response with excellent precision for replicate injections and LODs lower than 4 ppb; The method is simple and fast (<3 min per sample), using a small amount of sample (∼5 nL) with low reagent consumption, making it suitable for high-throughput applications; The inter/intraday reproducibility (RSD %) is less than 3 %, which is important for clinic application.
研究领域:
分析化学
·
营养学
·
生物医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）