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　　近年来，随着可跟踪脉搏、大脑功能、汗液中的生物标志物等可穿戴设备的发展，医学传感技术取得了长足的进步。然而，现有的可穿戴式压力传感器存在一个大问题：即使是最轻微的压力，如紧身长袖衬衫盖在传感器上的压力，也会使它们偏离轨道。

　　Texas Engineers 已经解决了这个困扰该领域多年的问题。他们通过创新混合传感方法来做到这一点，该方法允许该设备拥有当今使用的两种主要类型传感器的特性。

　　航天工程与工程力学系副教授卢南树说：“柔性压力传感器领域非常拥挤，20年后我们遇到了瓶颈，因为没有人能够解决压力和灵敏度之间的权衡。”个能够利用新的混合模式来承受压力而不显着降低灵敏度的传感器。”

　　今天的软压力传感器通常由三层组成——一个可变形的传感层夹在一对电极之间。这些传感器通常属于压电电容式和压阻式两种类型之一。

　　Lu 的团队利用导电且高度多孔的纳米复合材料作为传感层，并在传感器上添加了额外的绝缘层，使其具有两种传感器的功能。这种新的混合传感使其能够更好地承受压力。

　　“当我们施加外部压力时，灵敏度会下降，但仍与其他零压力传感器相当，”Lu 说。

　　Lu 长期以来一直是这一传感领域的先驱，主要是通过她的电子纹身技术——一系列重量轻且可拉伸的设备，可以长时间放置在心脏、大脑或肌肉上，而几乎没有或根本没有不舒服。

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　　Medical sensing technology has taken great strides in recent years, with the development of wearable devices that can track pulse, brain function, biomarkers in sweat, and more. However, there is one big problem with existing wearable pressure sensors: even the slightest amount of pressure, something as light as a tight long sleeve shirt over a sensor, can throw them off track.

　　Texas Engineers have solved this problem, which has been vexing the field for years now. And they did it by innovating a first-ever hybrid sensing approach that allows the device to possess properties of the two predominant types of sensors in use today.

　　The field of flexible pressure sensors is extremely crowded, and after two decades we hit a bottleneck because no one could solve the tradeoff between pressure and sensitivity," said Nanshu Lu, an associate professor in the Department of Aerospace Engineering and Engineering Mechanics. This is the first sensor able to leverage a new hybrid mode to withstand pressure without a significant decay in sensitivity."

　　Soft pressure sensors today are generally made of three layers — a deformable sensing layer sandwiched in between a pair of electrodes. These sensors generally fall into one of two categories — piezo-capacitive and piezo-resistive.

　　Lu's team utilized an electrically conductive and highly porous nanocomposite as the sensing layer and added an extra insulating layer to the sensor, which gave it capabilities of both types of sensors. This new hybrid sensing is what allows it to better withstand pressure.

　　"As we apply external pressure, the sensitivity drops, but is still on par with other sensors at zero pressure," said Lu.

　　Lu has long been a pioneer in this sensing field, primarily through her electronic tattoo technology — a series of devices that are so lightweight and stretchable that they can be placed over the heart, the brain, or the muscle for extended periods with little or no discomfort.

　　Now she is working on ways to allow the sensor material to be wrapped around almost any object and give it the sensitivity of human skin. The most obvious application is wrapping it around robotic hands and fingers to give them the ability to recognize objects by touching them. But there are many other things it could do. "The applications could be unlimited," Lu said. "Stretchable, e-skin could be wrapped around almost any object."