Electrically Conductive Thin Films Based on Nanofibrillated Cellulose: Interactions with Water and Applications in Humidity Sensing

ACS Applied Materials & Interfaces
Katariina SolinO J Rojas

Abstract

TEMPO-oxidized cellulose nanofibrils (TOCNF) and oxidized carbon nanotubes (CNT) were used as humidity-responsive films and evaluated using electroacoustic admittance (quartz crystal microbalance with impedance monitoring, QCM-I) and electrical resistivity. Water uptake and swelling phenomena were investigated in a range of relative humidity (% RH) between 30 and 60% and temperatures between 25 and 50 °C. The presence of CNT endowed fibril networks with high water accessibility, enabling fast and sensitive response to changes in humidity, with mass gains of up to 20%. The TOCNF-based sensors became viscoelastic upon water uptake, as quantified by the Martin-Granstaff model. Sensing elements were supported on glass and paper substrates and confirmed a wide window of operation in terms of cyclic % RH, bending, adhesion, and durability. The electrical resistance of the supported films increased by ∼15% with changes in % RH from 20 to 60%. The proposed system offers a great potential to monitor changes in smart packaging.

References

Jul 30, 2014·Sensors·Matija MraovićAnton Pleteršek
Sep 19, 2014·Biomacromolecules·Tamilselvan MohanKarin Stana-Kleinschek
Mar 25, 2017·Nanomaterials·Hugo VoisinAji P Mathew
Mar 21, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Penghui ZhuGang Chen

❮ Previous
Next ❯

Citations

Aug 9, 2021·Carbohydrate Polymers·Zixiu LiYonghao Ni

❮ Previous
Next ❯

Related Concepts

Related Feeds

Adhesion Molecules in Health and Disease

Cell adhesion molecules are a subset of cell adhesion proteins located on the cell surface involved in binding with other cells or with the extracellular matrix in the process called cell adhesion. In essence, cell adhesion molecules help cells stick to each other and to their surroundings. Cell adhesion is a crucial component in maintaining tissue structure and function. Discover the latest research on adhesion molecule and their role in health and disease here.