Department of Basic Sciences Foundation , Air Force Engineering University , Xi'an 710051 , China.
Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-based Functional Materials and Devices , Soochow University , Suzhou 215123 , China.
ACS Appl Mater Interfaces. 2018 Oct 10;10(40):34485-34493. doi: 10.1021/acsami.8b11254. Epub 2018 Sep 27.
Flexible chemical sensors usually require transfer of prepared layers or whole device onto special flexible substrates and further attachment to target objects, limiting the practical applications. Herein, a sprayed gas sensor array utilizing silver nanoparticles (AgNPs)-all-carbon hybrid nanostructures is introduced to enable direct device preparation on various target objects. The fully flexible device is formed using metallic single-walled carbon nanotubes as conductive electrodes and AgNPs-decorated reduced graphene oxide as sensing layers. The sensor presents sensitive response ( R/ R) of 6.0-20 ppm NO, great mechanical robustness (3000 bending cycles), and obvious sensing ability as low as 0.2 ppm NO at room temperature. The sensitivity is about 3.3 and 13 times as that of the sample based on metal electrodes and the sample without AgNP decoration. The fabrication method demonstrates good scalability and suitability on the planar and nonplanar supports. The devices attached on a lab coat or the human body perform stable performance, indicating practicability in wearable and portable fields. The flexible and scalable sensor provides a new choice for real-time monitoring of toxic gases in personal mobile electronics and human-machine interactions.
柔性化学传感器通常需要将制备好的层或整个器件转移到特殊的柔性衬底上，并进一步附着在目标物体上，这限制了它们的实际应用。在此，引入了一种利用银纳米粒子（AgNPs）-全碳混合纳米结构的喷涂气体传感器阵列，以实现直接在各种目标物体上制备器件。该全柔性器件由金属单壁碳纳米管作为导电电极和 AgNPs 修饰的还原氧化石墨烯作为传感层构成。该传感器在室温下对 20ppm 以下的 NO 具有敏感的响应（R/R）为 6.0-20ppm，出色的机械鲁棒性（3000 次弯曲循环）和明显的传感能力，NO 浓度低至 0.2ppm。其灵敏度分别约为基于金属电极的样品和没有 AgNP 修饰的样品的 3.3 倍和 13 倍。该制造方法在平面和非平面衬底上表现出良好的可扩展性和适用性。附着在实验服或人体上的器件表现出稳定的性能，表明其在可穿戴和便携式领域的实用性。这种灵活和可扩展的传感器为个人移动电子设备和人机交互中有毒气体的实时监测提供了新的选择。
