Open AccessNanodancing with Moisture: Humidity‐Sensitive Bilayer Actuator Derived from Cellulose Nanofibrils and Reduced Graphene Oxide
Author(s) -
Héraly Frédéric,
Zhang Miao,
Åhl Agnes,
Cao Wei,
Bergström Lennart,
Yuan Jiayin
Publication year - 2022
Publication title -
advanced intelligent systems
Language(s) - English
Resource type - Journals
ISSN - 2640-4567
DOI - 10.1002/aisy.202100084
Subject(s) - materials science , actuator , bilayer , graphene , oxide , humidity , layer (electronics) , nanomaterials , relative humidity , composite material , cellulose , nanosheet , nanotechnology , chemical engineering , membrane , chemistry , electrical engineering , metallurgy , thermodynamics , engineering , biochemistry , physics
Bilayer actuators, traditionally consisting of two laminated materials, are the most common types of soft or hybrid actuators. Herein, a nanomaterial‐based organic–inorganic humidity‐sensitive bilayer actuator composed of TEMPO‐oxidized cellulose nanofibrils (TCNF‐Na + ) and reduced graphene oxide (rGO) sheets is presented. The hybrid actuator displays a large humidity‐driven locomotion with an atypical fast unbending. Cationic exchange of the anionically charged TCNF‐Na + and control of the layer thickness is used to tune and dictate the locomotion and actuator's response to humidity variations. Assembly of a self‐oscillating electrical circuit, that includes a conductive rGO layer, displays autonomous on‐and‐off lighting in response to actuation‐driven alternating electrical heating.