Prof. Yuanjie Su Profile

Prof. Yuanjie Su

at University of Electronic Science and Technology of China

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Publications (3)

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Proceedings Article | 24 November 2021 Paper

3D network PPy nanofibers for highly sensitive flexible piezoresistive pressure sensors

Hong Pan, Guangzhong Xie, Yuanjie Su, Huiling Tai, Xiaosong Du, Yadong Jiang

Proceedings Volume 12062, 120620K (2021) https://doi.org/10.1117/12.2606499

KEYWORDS: Sensors, Nanofibers, Protactinium, Particles, Thin films, Ferroelectric polymers, Electrodes, Composites, Piezoresistive sensors, Sensor networks

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Polypyrrole (PPy) is extremely suitable for fabricating piezoresistive pressure sensors owing to its good biocompatibility and excellent electrical conductivity. However, the intrinsic rigidity and brittleness of dense PPy particles are difficult to form flexible conducting elastomers which hinder its further applications in wearable health monitoring systems. Herein, we report an efficient coaxial nanofibers network strategy to fabricate 3D conductive and elastic topological film through polydopamine (PDA)-assisted homogeneous deposition of PPy particles onto PVDF nanofibers (PVDF/PDA/PPy, PPP). It is noteworthy that dense PPy particles are difficult to lonely form flexible conducting film due to its rigid conjugated-ring backbone. However, PPy particles deposit on the surface of flexible PVDF/PDA nanofiber to form 3D network conducting films, which is both conductive and elastic, with the capable of withstanding large effective strains and stresses. Benefit from their unique 3D conducting network structures with more contact sites, the obtained sensors have superb sensitivity to the subtle pressure.

Proceedings Article | 4 December 2020 Paper

Morphology-modeled chitosan nanoparticles/WS2 nanosheets for advancing the sensing properties of triboelectric acetone sensor

Bohao Liu, Guangzhong Xie, Huiling Tai, Yuanjie Su, Yadong Jiang

Proceedings Volume 11617, 116171B (2020) https://doi.org/10.1117/12.2585108

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In this work, an acetone sensor enabled by a vertical contact-separate mode triboelectric nanogenerator (TENG) was proposed. Using a combined coacervation/precipitation synthesis and spray coating method, chitosan nanoparticle decorated tungsten disulfide nanosheet (CS-NP/WS₂-NS) that acted both as the triboelectric and sensing film was prepared and then assembled with microstructure-decorated polydimethylsiloxane (PDMS) film to obtain triboelectric acetone sensor. For comparison, CS-NP based sensor was prepared through the same method. The morphology and chemical properties of the fabricated sensors based on CS-NP and CS-NP/WS₂-NS film were characterized by SEM, FTIR and XPS, respectively. Combined the contact separation between CS-NP/WS₂-NS sensing film and PDMS with the electrostatic induction, the output signals were produced by the flow of induced charge between the electrodes. Results indicated that the CS-NP/WS₂-NS based sensor exhibited a higher response (26.70%) toward 10 ppm of acetone compared to the CS-NP based sensor (7.12%). Meanwhile, both the two sensors held a linear response towards 2-10 ppm acetone (correlation coefficients are 0.9661 and 0.8518, respectively). In conclusion, the CS-NP/WS₂-NS gas sensor has great potential in the applications of acetone detection without additional power supplies and provides a useful strategy for the researches of novel acetone sensors enabled by triboelectric effect.

Proceedings Article | 8 February 2019 Paper

Flexible self-powered ammonia sensor based on Ce-ZnO composite film

Si Wang, Huiling Tai, Guangzhong Xie, Yuanjie Su, Xiaosong Du, Yadong Jiang

Proceedings Volume 10843, 108431I (2019) https://doi.org/10.1117/12.2506914

KEYWORDS: Sensors, Zinc oxide, Nanoparticles, Thin films, Cerium, Absorption, Composites, Heterojunctions, Doping, FT-IR spectroscopy

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In this work, a flexible self-powered ammonia (NH₃) sensing system based on a vertical contact-separate mode triboelectric nanogenerator (TENG) has been proposed for room temperature detection of NH₃ concentrations. By integrating NH₃-sensing materials into the nanogenerator (TENG), the degree of ambient NH₃ concentration can be actively detected at room temperature. The output voltage of the self-powered system has a proportional relationship with NH₃ concentrations. Furthermore, the Ce-ZnO heterostructure nanoparticles thin film was prepared by hydrothermal synthesis method under 150°C and then form a sensitive film through spray method, which demonstrates a good sensing-response when exposed to NH₃ molecules. For comparison, the ZnO nanoparticles was prepared through the same method. Moreover, the morphology and chemical properties of the fabricated sensor based on ZnO nanoparticles and Ce-ZnO heterostructure nanoparticles film were characterized by SEM, UV-visible spectroscopy and XRD, respectively. In addition, the prepared self-powered triboelectric NH₃ sensor based on Ce-ZnO heterostructure nanoparticles composite thin film holds a gas-sensing response of 44.68% at 100 ppm NH₃. The doping of Ce in the hydrothermal synthesis process of ZnO nanoparticles effectively enhanced the active sites of ZnO, leading to an increase of the NH₃-sensing response compared to pure ZnO nanoparticles film, which is 4.4 times higher than that of pure ZnO. This research not only provides a simple method in self-powered NH₃sensing but also successfully realizes the integration of NH₃-sensitive materials in the TENG to achieve integrated compatibility in NH₃detection.

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