Hang Yang,Dong Tu,Yi Wei,Xinru Huang,Haonan Ju,Wei Wang,Fan Xia,Xiuguo Chen,Guogang Li
Owing to the unique mechano-optical response, mechanoluminescence (ML) materials possess dynamic, sensitive, visual, and recoverable strain sensing capabilities. However, the dilemma of lacking outstanding ML materials with high detection precision under micro deformations still exists, thereby hindering advanced applications in multi-angle and multidimensional scenarios. Herein, a novel Pr 3+ -doped perovskite oxide (NaTaO 3 :Pr 3+ )-based composite elastic thin film is developed, which achieves ultrasensitive ML responses to both microscale compressive and tensile strains. Compared with the record of LiTaO 3 :Tb 3+ , the corresponding deformation detection limit has been improved by five times, reaching 0.01%, which is comparable to the performance of the widely used piezoresistive and capacitive sensors. The results reveal that the ML originates from the interaction between adjacent defects and the varying local piezoelectric fields near Pr Na O 9 and Pr Ta O 6 polyhedra. Most notably, the strain and ML demonstrate identical distributions on a 3D-printed model coated with NaTaO 3 :Pr 3+ thin film even under micro deformation less than 0.4%, highlighting the significant potential of NaTaO 3 :Pr 3+ for advanced 3D microstrain sensing applications. This work provides convincing insights into the investigation of ML mechanisms through local trap and piezoelectricity analyses, along with an exemplificative application in advanced strain sensing and visualization at microscopic and multidimensional scales.
Guangmeng Chen,Ming Mu,Wenjie Yu,Li Jia,Ziqiang Hu,Weiwei Zhao,Xiaoqing Liu
Flexible sensors in practical applications require them to show sufficiently high sensitivity over wide sensing ranges, however, there always exists a trade-off. Herein, we address the aforementioned challenging through the geometric innovation of laser-induced graphene (LIG) conductive paths. A liquid benzoxazine (PGE-fa) precursor is developed to enable the in-situ LIG fabrication on PDMS substrates, eliminating the conventional transfer-induced defects. Furthermore, a dual architecture integrating straight and serpentine LIG patterns in parallel synergistically resolves the sensitivity-range paradox, where the straight segments bear high sensitivity (GF = 68.98 at 1% strain) for micro-strain detection (0.05–10%), while the serpentine components maintain conductivity for large-strain tolerance (up to 30%). It is revealed that the cracks appear in straight LIG line under small deformations, resulting in resistance change to guarantee high sensitivity, whereas the serpentine LIG line can dissipate stress through in-plane bending and rotational deformation, and therefore, contribute to the conductive path to accommodate broad strain range. In addition, the sensor exhibits exceptional performance of rapid response/recovery (180/200 ms), ultralow detection limit (0.05% strain), and 5,000-cycle durability. Experimental validations in pulse waveform analysis, blink detection, joint motion monitoring, and Morse code-based human-machine communication collectively demonstrate the sensor's versatility across diverse physiological and biomechanical sensing scenarios. It is believed that the intelligent structural design in this work is attractive for the development of high-performance wearable systems in personalized healthcare.
危险品化学品经营许可证（带存储）