Water Sorption in MXene/Polyelectrolyte Multilayers for Ultrafast Humidity Sensing

By Hyosung An, T. Habib, Smit Shah, Huili Gao, Anish Patel, Ian J. Echols, Xiaofei Zhao, M. Radovic, Micah J. Green, Jodie L. Lutkenhaus. ACS Applied Nano Materials, 2019

212 citations recorded by the source corpus.

The rapidly growing fields of noncontact medical diagnosis, noninvasive epidermal sensing, and environmental monitoring bring forward the need for fast humidity sensors. However, achieving a rapid response to dynamic changes in humidity, such as for human respiration, is challenging. This is because the response can be limited by the diffusion of water, the sorption of water in the material, and the sensing method itself. Here, the water sorption and response mechanism for multilayer assemblies made from MXene nanosheets and polyelectrolytes for ultrafast humidity sensing are described. MXenes are a class of two-dimensional transition metal carbides (e.g., Ti3C2) possessing hydrophilicity and metal-like conductivity. Herein we show that MXene/polyelectrolyte multilayer films prepared using layer-by-layer (LbL) assembly exhibit response and recovery times exceeding those of most humidity sensors. Quartz crystal microbalance and ellipsometry support the mechanism that, upon changing humidity, water molecule...

Subfields: Biomedical Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/5dfccbee674a15432915792e32f42e2ad9b2d7df

Citations in the corpus

• One MAX phase, different MXenes: A guideline to understand the crucial role of etching conditions on Ti3C2Tx surface chemistry (2020, unknown): “and biosensors [12,13], electromechanical actuators [14], pH and humidity sensor [15,16], nanomedicine [17] or gas and liquid separation and purification[18,19].”