Tsogbayar Dashdendev, Seo Jungyoon, Hwang Taehoon, Park Jisu, Ko Eun, Kim Yumin, Yoon Chang-Min, Lee Hwa Sung
Department of Materials Science and Chemical Engineering, Hanyang University, Ansan 15588, Republic of Korea.
BK21 FOUR ERICA-ACE Center, Hanyang University, Ansan 15588, Republic of Korea.
ACS Appl Mater Interfaces. 2024 Sep 18;16(37):49574-49583. doi: 10.1021/acsami.4c09337. Epub 2024 Sep 10.
Flexible and wearable physical sensors have gained significant interest owing to their potential in attachable devices, electronic skin, and multipurpose sensors. The physical stimuli of these sensors typically consist of vertically and horizontally applied pressures and strains, respectively. However, owing to their similar response characteristics, interference occurs between the two types of signals detected, complicating the distinction between pressure and strain stimuli, leading to inaccurate data interpretation and reduced sensor specificity. Therefore, we developed a dual-sensing-mode physical sensor with separate response mechanisms for the two types of physical stimuli based on a unique structural design that can independently induce changes in the piezocapacitance and piezoresistance for pressure and strain stimuli, respectively. The asterisk-shaped piezoresistive pathway (electrode), designed for multifunctionality, effectively detected the intensity and direction of tensile deformation, and an elastomeric sponge structure positioned between the two electrodes detected the pressure signals via changes in capacitance. This dual-sensing-mode sensor offers clearer signal differentiation and enhanced multifunctionality compared to those of traditional single-mode sensors. Additionally, extensive experimentation demonstrated that our sensor has a good sensitivity, high linearity, and stability in detecting signals, proving its applicability for sophisticated monitoring and control tasks that require the differential detection between pressure and deformation signals.
柔性可穿戴物理传感器因其在可附着设备、电子皮肤和多功能传感器方面的潜力而备受关注。这些传感器的物理刺激通常分别由垂直和水平施加的压力和应变组成。然而，由于它们相似的响应特性，在检测到的两种信号之间会发生干扰，使得区分压力和应变刺激变得复杂，导致数据解释不准确且传感器特异性降低。因此，我们基于独特的结构设计开发了一种双传感模式物理传感器，该设计能够分别针对两种物理刺激独立地引起压电电容和压阻的变化，从而为两种物理刺激提供单独的响应机制。为实现多功能而设计的星状压阻通路（电极）有效地检测了拉伸变形的强度和方向，位于两个电极之间的弹性海绵结构通过电容变化检测压力信号。与传统单模式传感器相比，这种双传感模式传感器具有更清晰的信号区分能力和更强的多功能性。此外，大量实验表明，我们的传感器在检测信号时具有良好的灵敏度、高线性度和稳定性，证明了其适用于需要区分压力和变形信号的复杂监测和控制任务。
