| Summary: | Based on Quartz Crystal Microbalance (QCM) sensing platform, modifying functional groups was usually used to improve the performance of sensing materials. In this work, we reported a novel sensing material, carboxyl functionalized carbon nanocoil by acidification treatment. It was found that carboxyl functionalized carbon nanocoil had excellent reversible response to ammonia (NH _3 ), and the response to 50 ppm NH _3 was as high as 8.1 Hz. As a contrast, pristine carbon nanocoil had only 2 Hz response to 50 ppm NH _3 . The enhanced response should be ascribed to the hydrogen bond adsorption between carboxyl gropus and NH _3 molecules. These results demonstrated that carboxyl functionalization could improve the NH _3 sensing performance of carbon nanocoil, which has potential in monitoring NH _3 in the future.
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