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Bio-Design and Manufacturing  2024 Vol.7 No.4 P.413-427

http://doi.org/10.1007/s42242-024-00293-3


A mixed-coordination electron trapping-enabled high-precision touch-sensitive screen for wearable devices


Author(s):  Xi Zhang, Junchi Ma, Hualin Deng, Jinming Zhong, Kaichen Xu, Qiang Wu, Bo Wen & Dongfeng Diao

Affiliation(s):  Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering, College of Mechatronics and Control Engineering, Shenzhen University, Shenzhen 518060, China; more

Corresponding email(s):   drbowen@szu.edu.cn

Key Words:  Flexible touch-sensitive screen Graphenemetal nanofilms Mixed coordination Wearable device


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Xi Zhang, Junchi Ma, Hualin Deng, Jinming Zhong, Kaichen Xu, Qiang Wu, Bo Wen & Dongfeng Diao . A mixed-coordination electron trapping-enabled high-precision touch-sensitive screen for wearable devices[J]. Journal of Zhejiang University Science D, 2024, 7(4): 413-427.

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Abstract: 
Touch-sensitive screens are crucial components of wearable devices. Materials such as reduced graphene oxide (rGO), carbon nanotubes (CNTs), and graphene offer promising solutions for flexible touch-sensitive screens. However, when stacked with flexible substrates to form multilayered capacitive touching sensors, these materials often suffer from substrate delamination in response to deformation; this is due to the materials having different Youngs modulus values. Delamination results in failure to offer accurate touch screen recognition. In this work, we demonstrate an induced charge-based mutual capacitive touching sensor capable of high-precision touch sensing. This is enabled by electron trapping and polarization effects related to mixed-coordinated bonding between copper nanoparticles and vertically grown graphene nanosheets. Here, we used an electron cyclotron resonance system to directly fabricate graphenemetal nanofilms (GMNFs) using carbon and copper, which are firmly adhered to flexible substrates. After being subjected to 3000 bending actions, we observed almost no change in touch sensitivity. The screen interaction system, which has a signal-to-noise ratio of 41.16 dB and resolution of 650 dpi, was tested using a handwritten Chinese character recognition trial and achieved an accuracy of 94.82%. Taken together, these results show the promise of touch-sensitive screens that use directly fabricated GMNFs for wearable devices.

深圳大学刁东风张希团队 | 一种基于混配位电子俘获效应的高精度触摸屏

本研究论文聚焦于一种基于混配位电子俘获效应的互电容式触摸屏及其应用的探究。触摸屏,作为数字化时代的代表器件类型,在可穿戴设备中扮演着至关重要的角色。新型碳纳米材料(如碳纳米管、石墨烯等)为研发高性能柔性触摸屏提供了新路径。然而,当这些材料与柔性基板堆叠以形成电容触摸传感器时,常常会在受形变时发生材料-基板剥离现象,导致触摸屏识别失准,降低柔性触摸屏应用范围。在本研究中,我们使用电子回旋共振系统(ECR)在柔性基板上直接原位沉积了石墨烯-金属纳米薄膜(GMNF),避免了材料-基板剥离现象的发生。通过该方法制备出的基于感应电荷的互电容式触摸传感器,能够实现高精度的触摸感应,极大地拓展了触摸屏的应用范围。在GMNF中,铜纳米粒子和垂直生长的石墨烯纳米片之间形成的混配位使得该材料具有电子俘获效应。它们紧密地附着在柔性基板上,经过3000次弯折后,触摸灵敏度未发生明显降低。基于此器件的交互触摸系统具有41.16 dB的高信噪比和650 dpi的分辨率。通过手写中文字符识别测试,该触控系统对中文字符识别准确率高达94.82%。这些结果显示了直接沉积制备的GMNF触摸屏传感器具有极佳的稳定性和识别能力,在可穿戴设备方面具有良好的应用前景。

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