Yin He,Zhichao Qiao,Lujie Fan,Zhaopeng Xia,Jingjie Ma,Xiaoying Zheng,Ling Deng,Xiaoxuan Xu,Hao Liu
Although bio-based sensing materials have a wide range of applications in the field of pressure detection, they still need to improve their sensitivity, detection limit and hysteresis. This paper studied the relationship between the 3D pore structure and sensing performance under dynamics. Using Balsa wood as the substrate, CWA/TPU aerogel and its sensor were prepared with lightweight, compressibility, highly sensitivity, wide-detection, and low-hysteresis. Meanwhile, the brittleness problem of the carbonized aerogel was solved by uniformly attaching TPU to the aerogel interface. In this paper, the 3D structure of CWA/TPU aerogel during compression was reconstructed by Micro-XCT technology, and the results show that the sensitivity of the bio-based carbonized material is directly proportional to the porosity and inversely proportional to the aspect ratio. This CWA/TPU aerogel pressure sensor has a high sensitivity of 76.18 kPa −1 in a wide detection limit of 0.6 Pa–100 kPa, 90 % supercompression strain, ±7.4 % low hysteresis and outstanding stability over 10,000 cycles. And the sensor can detect different ranges of pressure strains and has great potential for future applications in physiological signal monitoring, action recognition, and sports training.
Huirong Zou,Wenjuan Zhu,Jingtao Zhao,Su Zhou,Shiqing Xu,Lei Lei
Lanthanide-doped fluoride nanoscintillators (NSs) have emerged as promising candidates for X-ray imaging. However, strong afterglow, long lifetime, and poor irradiation stability pose key challenges for real-time dynamic X-ray imaging. In this study, the sub-10 nm Lu 6 O 5 F 8 :Tb NSs with tunable morphologies are prepared via incorporating Li + /Na + ions. The X-ray excited optical luminescence (XEOL) intensity of the Lu6O5F8:15Tb/10Li NSs is stronger than that of NaLuF 4 :15 Tb NSs with a similar particle size while its afterglow is only ≈2.7% compared to that of NaLuF 4 :15 Tb NSs. Utilizing the Lu 6 O 5 F 8 :15 Tb/10Li NSs-integrated film as a scintillator screen, a high resolution of ≈21.6 lp/mm is achieved. Even at a low dose of 0.23 µGy, the fringe detail in the electron device is clearly observed in the X-ray image. The afterglow intensity of the Lu 6 O 5 F 8 :10Eu/10Li NSs decays to 0.7% at 40 µs, which is better than that of CsI:Tl (3.6%@40 µs). Moreover, the Lu 6 O 5 F 8 :10Eu/10Li NSs with a lifetime of 1.65 µs are verified for use in dynamic 3D X-ray imaging. These findings represent a significant advancement in the development of new NSs for high-performance dynamic X-ray imaging.
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