Mr. Yalei Li Profile

Yalei Li

at Soochow Univ

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Publications (2)

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Proceedings Article | 10 October 2020 Poster + Paper

Flexible transparent array capacitive sensor based on pyramid structure

ZhenZong Xu, YanHua Liu, YaLei Li, LinSen Chen

Proceedings Volume 11554, 115541F (2020) https://doi.org/10.1117/12.2574815

KEYWORDS: Sensors, Electrodes, Manufacturing, Nickel, Visualization, Standards development, Internet, Optical lithography, Capacitance, Biomimetics

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In the era of the Internet of everything, 5G is on the way out, and the demand of various terminal devices for sensors is increasing, but at present, the commercial sensors on the market are mainly made of rigid materials.Therefore, flexible and transparent sensors are rare in certain situations (such as human wearable devices).Therefore, it is an ideal choice for wearable electronic products to develop a flexible and transparent pressure sensor with high sensitivity, quick response, wide range of production and simple process.Based on the photolithography process, we successfully manufactured a flexible transparent capacitance sensor with a pyramid structure based on nickel electrode /PDMS sandwich structure.Although the biomimetic structure reported in other literature or the folded microstructure generated by tensile PDMS can also be used to improve sensitivity, it does not have graphic controllability and affects mass production. Compared with this, the lithography process has incomparable benefits.The production process is standardized, and the graphic control can be controlled, and the unified and standardized production can be carried out in large area and large quantity.And as far as we know, the nickel electrode capacitive pressure sensor was reported for the first time.Its flexibility and transparency are better than ITO electrodes currently on the market.Simple process, low price and easy to manufacture in large format.Compared with the pure PDMS dielectric layer with planar structure, the pyramid microstructure sensor has higher sensitivity, lower detection limit, good stability and durability.The mechanism of enhanced sensing for pyramid microstructure is also discussed.Therefore, the developed pressure sensor has a great application prospect in the field of electronic skin.

Proceedings Article | 10 October 2020 Poster + Paper

Self-standing metallic mesh with Cu nanoparticles for flexible transparent non-enzymatic glucose sensor

Yalei Li, Zhenzong Xu, Linsen Chen, Yanhua Liu

Proceedings Volume 11554, 115541H (2020) https://doi.org/10.1117/12.2574903

KEYWORDS: Glucose, Sensors, Copper, Nanoparticles, Nanostructuring, Electrodes, Transparency, Transmittance, Urea

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Non-enzymatic glucose sensor has the characteristics of simple operation and low production cost compared with the strict operating condition of enzyme-based glucose sensor, and various nanostructured Cu have been investigated extensively for non-enzymatic glucose sensor due to their high electrocatalytic performance, low-cost and abundance. In addition, most of the current glucose sensors have poor adhesion due to their rigid structures, or increased discomfort in the wearable devices due to poor breathability. In this paper, a flexible, transparent, breathable, and attachable nonenzymatic glucose sensors was fabricated via in situ growth of Cu nanoparticle on transparent nickel-mesh electrodes. The prepared Cu-Ni non-enzymatic glucose sensors have the advantages of ultrathin (~10 μm), high transparency (~ 80% transmittance), and high breathability (duty cycle ~ 90%). In addition, the non-enzymatic glucose sensors we prepared exhibited an extraordinary limit of detection as low as 2 μM and free from chloride poisoning. Furthermore, the interference from urea, fructose, lactose, sucrose, uric acid at the level of their physiological concentration were insignificant, indicating excellent selectivity. Therefore, the prepared Cu-Ni non-enzymatic glucose sensors may become a promising nonenzymatic glucose sensor and the work also provides a strategy for the design of wearable glucose sensors.

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