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CNT/MOF composite provides record humidity sensitivity

posted Nov 3, 2017, 12:06 AM by Khaled salama   [ updated Nov 7, 2017, 6:50 AM ]
We report the fabrication of a highly sensitive humidity sensor that is based on composite thin films of HKUST-1 MOF and carbon nanotubes (CNT) demonstrating a 230% increase in sensitivity compared to plain HKUST-1 film. The optimized CNT-HKUST-1 composite thin films are stable, reliable, and have an average sensitivity of about 2.5 × 10
-5 ( Δf / f ) per percent of relative humidity, which is up to ten times better than previously reported QCM-based humidity sensors. The approach presented is facile and paves a promising path towards enhancing the sensitivity of MOF-based sensors. More details can be found at our recently accepted paper and also covered by Nanowerk in an article : CNT/MOF nanocomposite enhance the performance of humidity sensors 
Karumbaiah N. Chappanda, Osama Shekhah, Omar Yassine, Shashikant P. Patole, Mohamed Eddaoudi, and Khaled N. Salama, The quest for highly sensitive QCM humidity sensors: the coating of CNT/MOF composite sensing films as case study, Sensors and Actuators B: Chemical, 2017 accepted.