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

IF 8.1 1区 医学 Q1 ENGINEERING, BIOMEDICAL Bio-Design and Manufacturing Pub Date : 2024-07-10 DOI:10.1007/s42242-024-00293-3
Xi Zhang, Junchi Ma, Hualin Deng, Jinming Zhong, Kaichen Xu, Qiang Wu, Bo Wen, Dongfeng Diao
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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 Young’s 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 graphene–metal 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.

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用于可穿戴设备的混合配位电子陷阱式高精度触摸屏
触摸感应屏幕是可穿戴设备的重要组成部分。还原氧化石墨烯 (rGO)、碳纳米管 (CNT) 和石墨烯等材料为柔性触敏屏幕提供了前景广阔的解决方案。然而,当这些材料与柔性基底堆叠形成多层电容式触摸传感器时,由于材料的杨氏模量值不同,往往会在变形时出现基底分层现象。分层导致无法提供准确的触摸屏识别。在这项工作中,我们展示了一种基于诱导电荷的互电容式触摸传感器,能够实现高精度触摸感应。这得益于铜纳米颗粒与垂直生长的石墨烯纳米片之间混合配位键相关的电子捕获和极化效应。在这里,我们使用电子回旋共振系统直接用碳和铜制造了石墨烯-金属纳米薄膜(GMNFs),并将其牢固地粘附在柔性基底上。经过 3000 次弯曲后,我们观察到触摸灵敏度几乎没有变化。屏幕交互系统的信噪比为 41.16 dB,分辨率为 650 dpi,通过手写汉字识别试验进行了测试,准确率达到 94.82%。综上所述,这些结果表明,使用直接制造的 GMNF 的触敏屏幕有望用于可穿戴设备。
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来源期刊
Bio-Design and Manufacturing
Bio-Design and Manufacturing Materials Science-Materials Science (miscellaneous)
CiteScore
13.30
自引率
7.60%
发文量
148
期刊介绍: Bio-Design and Manufacturing reports new research, new technology and new applications in the field of biomanufacturing, especially 3D bioprinting. Topics of Bio-Design and Manufacturing cover tissue engineering, regenerative medicine, mechanical devices from the perspectives of materials, biology, medicine and mechanical engineering, with a focus on manufacturing science and technology to fulfil the requirement of bio-design.
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