Journal
CARBOHYDRATE POLYMERS
Volume 298, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2022.120109
Keywords
Humidity sensor; Cellulose nanofibers; MXene; Mechanical properties
Categories
Funding
- Joint Research for International Cooperation on Scientific and Technological Innovation by MOST [2017YFE0184900]
- National Natural Science Foundation of Guangdong Province, China [2021A1515010327]
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Inspired by nacre-layered nanostructure, 1D TEMPO-oxidized cellulose nanofibers were used as a template to assemble 2D MXene nanosheets into a flexible and strong nanocomposite film. The film exhibited excellent humidity-sensing performance and showed potential applications in smart wearable electronics.
Inspired by nacre-layered nanostructure, 1D 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO)-oxidized cellulose nanofibers (TOCNFs) were used as the template to assemble 2D MXene nanosheets into a layered TOCNF/MXene nanocomposite film by a vacuum-assisted filtration strategy. The synergistic effect of the MXene brick and TOCNFs mortar endowed the composite film with excellent flexibility and a tensile strength of 128.13 MPa, which were attributed to interactions between the interconnected three-dimensional network and multiple hydrogen bonds between TOCNFs and MXene. The humidity-sensing mechanism of the sensor involved the swelling/contraction of channels between MXene interlayers induced by adsorbed H2O and the swelling of TOCNFs. The TOCNF/MXene sensor showed a maximum response (-& UDelta;I/I0) of 90 % under 97 % RH, outstanding bending and folding durability (up to 50 cycles), and long-term stability. Lastly, the sensor could dynamically monitor human respiration, skin, and fingertip humidity, suggesting its promising applications in smart wearable electronics.
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