Inkjet-printing is a promising low-cost fabrication technique capable of depositing functional materials with micrometer resolution, making this technique attractive for the fabrication of deformable sensors. Despite all the possible promising applications, no examples of inkjet-printed strain sensors array able to map substrate surface deformation have been proposed yet. On the base of these premises, it is here presented the development and characterization of an all-inkjet-printed resistive strain sensors array, highlighting criteria adopted in the design phase. Initially, the strain sensing behavior of the printed CNTs percolation matrix was investigated by fabricating and electromechanically characterizing a single sensor. The proposed single sensor featured a sensitivity of 7.2 ± 2 up to 2.5% strain, demonstrating that the proposed sensing material is suitable for the fabrication of an inkjet-printed strain sensors array. Moreover, the fabricated sensors array was characterized through a confined electromechanical tensile test in which a non-homogeneous strain state was applied. Results showed the mapping capability of inkjet-printed deformable sensors array that is able to measure different local strains on the substrate surface. This work paves the way for using inkjet-printing technique for the realization of sensors with a larger number of interesting applications.

中文翻译：

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应变映射喷墨印刷电阻传感器阵列

喷墨打印是一种有前途的低成本制造技术，能够以微米分辨率沉积功能材料，使该技术对制造可变形传感器具有吸引力。尽管有所有可能的有前途的应用，但尚未提出能够绘制基板表面变形的喷墨印刷应变传感器阵列的示例。在这些前提的基础上，这里介绍了全喷墨印刷电阻应变传感器阵列的开发和表征，突出了设计阶段采用的标准。最初，通过制造和机电表征单个传感器来研究印刷碳纳米管渗流矩阵的应变传感行为。建议的单个传感器的灵敏度为 7.2 ± 2 至 2.5% 应变，证明所提出的传感材料适用于制造喷墨印刷应变传感器阵列。此外，制造的传感器阵列的特征是通过施加非均匀应变状态的受限机电拉伸试验。结果表明喷墨印刷的可变形传感器阵列的映射能力能够测量基板表面上的不同局部应变。这项工作为使用喷墨打印技术实现具有大量有趣应用的传感器铺平了道路。结果表明喷墨印刷的可变形传感器阵列的映射能力能够测量基板表面上的不同局部应变。这项工作为使用喷墨打印技术实现具有大量有趣应用的传感器铺平了道路。结果表明喷墨印刷的可变形传感器阵列的映射能力能够测量基板表面上的不同局部应变。这项工作为使用喷墨打印技术实现具有大量有趣应用的传感器铺平了道路。