ADVANCED MATERIALS
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2024
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IF 27.4
Xujing Zhang,Jiaxiang Chen,Zhihao Zheng,Songsong Tang,Bin Cheng,Zhiwei Zhang,Rui Ma,Zetong Chen,Jingting Zhuo,Lingyun Cao,Zhihong Chen,Jiangfeng He,Xiaofeng Wang,Guowei Yang,Fang Yi
Temperature and pulse waves are two fundamental indicators of body health. Specifically, thermoresistive flexible temperature sensors are one of the most applied sensors. However, they suffer from poor reproducibility of resistivity; and decoupling temperature from pressure/strain is still challenging. Besides, autonomous thermoregulation by wearable sensory systems is in high demand, but conventional commercial apparatuses are cumbersome and not suitable for long-term portable use. Here, a material-design strategy is developed to overcome the problem of poor reproducibility of resistivity by tuning the thermal expansion coefficient to nearly zero, precluding the detriment caused by shape expansion/shrinkage with temperature variation and achieving high reproducibility. The strategy also obtains more reliable sensitivity and higher stability, and the designed thermoresistive fiber has strain-insensitive sensing performance and fast response/recovery time. A smart textile woven by the thermoresistive fiber can decouple temperature and pulse without crosstalk; and a flexible wireless closed-loop system comprising the smart textile, a heating textile, a flexible diminutive control patch, and a smartphone is designed and constructed to monitor health status in real-time and autonomously regulate body temperature. This work offers a new route to circumvent temperature-sensitive effects for flexible sensors and new insights for personalized thermoregulation.
研究领域:
生物医学工程
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材料科学
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电子工程
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
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2015
·Vol. 3
·期 39
·10154-10163
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IF 4.696
Kaisheng Yao,Xinying Li,Yuling Zhao,Weiwei Lu,Jianji Wang,Jiongliang Yuan
In this work, a simple and facile strategy was developed for the fabrication of large sized Au spherical architectures (AuSAs) with flexible nanoflakes as subunits by using a liquid–liquid interfacial reaction route at room temperature. The as-prepared AuSAs were characterized and analyzed by scanning electron microscopy, X-ray powder diffraction, thermogravimetric analysis and transmission electron microscopy. The effects of a series of factors on the morphologies and structures of the products were studied in detail. On the basis of control experiments and molecular dynamics simulations, a possible growth mechanism was suggested for the formation of AuSAs at the interface between toluene and water. Furthermore, due to the relatively large particle size, high surface roughness and high symmetry of the spherical characteristics, AuSAs could be used to perform individual particle SERS investigation, which demonstrated remarkable SERS responses and high reproducibility.
研究领域:
材料科学
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纳米技术
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化学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2015
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IF 4.097
Shicai Xu,Shouzhen Jiang,Jihua Wang,Jie Wei,Weiwei Yue,Yong Ma
An efficient surface enhanced Raman scattering (SERS) substrate has been developed based on highly ordered arrays of graphene–isolated Au nanoparticle (G/AuNP). By combining the electromagnetic enhancement activity of AuNP arrays and unique physical/chemical properties of graphene, the G/AuNP arrays shows high performance in terms of sensitivity, signal-to-noise ratio and reproducibility. The average enhancement factor obtained from the G/AuNP arrays for rhodamine 6G probe molecules is over 10 7 . The maximum deviations of SERS intensities from 20 positions of a same SERS substrate are in the range of 4.74% to 6.89% and from 20 different substrates in various batches are in the range of 5.67% to 8.37%, depending on different vibration modes . As a practical application of this SERS system, we detect the adenosine concentration in human serum. The detection results show a good linear correlation between SERS intensity and adenosine concentration within the range of 2 to 250 nM. This work may open up new opportunities in developing the applications of SERS in biomedical diagnostics, biological sensing and other biotechnology.
研究领域:
分析化学
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纳米生物技术
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生物传感
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转化医学
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分子诊断
✓ 已验证
DOI
高影响因子
Science China-Chemistry
·
2019
·Vol. 62
·期 6
·767-774
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IF 6.085
Li Erpeng,Li Wenqin,Li Linchang,Zhang Hao,Shen Chao,Wu Zihua,Zhang Weiwei,Xu Xiaojia,Tian He,Zhu Wei-Hong,Wu Yongzhen
The development of p-i-n structured perovskite solar cells (PSCs) requires more extensive explorations on seeking efficient, low cost and stable hole transporting materials (HTMs). Small molecular HTMs are superior to polymeric ones in terms of synthetic reproducibility as well as purity. However, thin films composed of small molecules are usually labile during the solution-based perovskite deposition. Herein, we propose a molecular engineering strategy of incorporating oligothiophene as conjugation bridge to develop robust oligomer HTMs for p-i-n type PSCs. Upon increasing the oligothiophene chain length from α-bithiophene to α-quaterthiophene and α-hexathiophene, their HOMO energy levels remain unchanged, but their solubility in common organic solvents decreased remarkably, thus greatly enhancing their tolerance to the perovskite deposition. The rational design of oligothiophene chain length can effectively tune their optoelectronic properties as well as thin film stability under polar solvent soaking. The best performance is achieved by an α-quaterthiophene based HTM (QT), showing a high efficiency of 17.69% with fill factor of 0.81, which are comparable to those of a commercially available benchmark polymer HTM (poly[bis (4-phenyl)(2,4-dimethylphenyl) amine], PTAA) based devices fabricated under the same conditions. Our developed oligomer system not only provides the definite molecular structures like small molecule-type HTMs, but also exhibits the excellent film-forming like polymer-type HTMs, thus achieving the well-balanced parameters among solvent tolerance, thin film conductivity, and interfacial charge transfer efficiency, especially building up a platform to develop low cost and reproducible efficient HTMs in p-i-n structured perovskite solar cells.
研究领域:
材料科学
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太阳能
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有机电子学
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光伏技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）