基于化学气相沉积法生长出的单壁碳纳米管(SWNTs)薄膜，利用聚二甲基硅氧烷(PDMS)作为基底，制备出一种具有三明治结构的柔性应变传感器，具有良好的光学透明性和电阻响应。探究了不同碳纳米管薄膜层数对传感器性能的影响。实验表明，随着SWNTs薄膜层数的增加，应变传感器的透光性和电阻响应逐渐降低，由单层SWNTs薄膜得到的应变传感器具有最大的电阻变化率，在10%应变下可达100%，即使在微小应变(2%)下仍能检测到明显的电阻变化(18%)。该应变传感器具有良好的耐久性，可以监测人体关节的运动状态，在柔性电子皮肤等领域具有潜在的应用。

Based on the single wall carbon nanotubes (SWNTs) films prepared by chemical vapor deposition, a flexible strain sensor with sandwich structure was prepared using polydimethylsiloxane (PDMS) as substrate, which has outstanding optical transparency and resistance response. The effects of different SWNTs layers on sensor performance were investigated. The experiments show that with the increase of the SWNTs film layers, light transmittance and resistance response of the strain sensor gradually reduces. The strain sensor obtained from a single layer of SWNTs film has the largest change of resistance, which amount to 100% at strain of 10%, even at small strain (2%) still detect a significant change in resistance (18%). The strain sensor has excellent outstanding durability and is used to detect the motion state of human body, it has potential applications in the areas of flexible electronic skin.