Stretchable gas sensors that accommodate the shape and motion characteristics of human body are indispensable to a wearable or attachable smart sensing system. However, these gas sensors usually have poor response and recovery kinetics when operated at room temperature, and especially suffer from humidity interference and mechanical robustness issues. Here, we demonstrate the first fully stretchable gas sensors which are operated at room temperature with enhanced stability against humidity. We created a crumpled quantum dot (QD) sensing layer on elastomeric substrate with flexible graphene as electrodes. Through the control over the prestrain of the flexible substrate, we achieved a 5.8 times improvement in NO₂ response at room temperature with desirable stretchability even under 1000 stretch/relax cycles mechanism deformation. The uniformly wavy structural configuration of the crumpled QD gas-sensing layer enabled an improvement in the antihumidity interference. The sensor response shows a minor vibration of 15.9% at room temperature from relative humidity of 0 to 86.7% compared to that of the flat-film sensors with vibration of 84.2%. The successful assembly of QD solids into a crumpled gas-sensing layer enabled a body-attachable, mechanically robust, and humidity-resistant gas sensor, opening up a new pathway to room-temperature operable gas sensors which may be implemented in future smart sensing systems such as stretchable electronic nose and multipurpose electronic skin.

中文翻译：

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完全可拉伸且防潮的量子点气体传感器

适应人体形状和运动特性的可伸缩气体传感器对于可穿戴或可连接的智能传感系统必不可少。然而，这些气体传感器在室温下操作时通常具有较差的响应和恢复动力学，并且尤其遭受湿度干扰和机械坚固性问题。在这里，我们演示了首个可完全拉伸的气体传感器，该传感器在室温下具有较高的防潮稳定性。我们在具有柔性石墨烯作为电极的弹性体基板上创建了一个皱缩的量子点（QD）感应层。通过控制柔性基板的预应变，我们将NO ₂的含量提高了5.8倍即使在1000次拉伸/松弛循环下，在室温下仍具有理想的可拉伸性时，机械变形也很明显。皱缩的QD气敏层的波浪状结构均匀，可以改善抗湿干扰。传感器的响应显示，相对湿度为84.2％的平面膜传感器，在室温下从0到86.7％的相对湿度有15.9％的轻微振动。将QD固体成功组装到皱缩的气体感应层中，使人体可连接，机械坚固且耐潮的气体传感器开辟了通往可在未来的智能感应系统中实现的室温可操作气体传感器的新途径。例如可伸缩的电子鼻和多功能电子皮肤。