Multifunctional materials based on cellulose and graphene
Materials in Sintering Processes and Generative Manufacturing Processes
Final Report Abstract
In this project, we mainly developed a simple and “green” platform to develop multifunctional materials based on cellulose and GO: disperse GO and dissolve cellulose in alkaline-urea aqueous solution. And the electrically conductive rGO/cellulose composites can be fabricated by so-called in-situ chemical reduction. These conductive materials could be applied as multifunctional sensors responding to different stimuli like tensile strain, liquids, environmental temperature, humidity, and others. The rGO/cellulose films show good temperature and humanity sensitivity. Moreover, the rGO/cellulose films can be used to detect the human breath cycle and human motion. The liquid sensitivity of the rGO/cellulose films is strongly dependent on the liquid type, the liquid temperature, and ion concentration. This can expand the application of our rGO/cellulose composite films to many various fields, such as monitoring of seawater, sweat, body fluid, and so on. Based on the sensing results, the flexible film is a promising functional and smart material worth for further investigation and introduction to the field of sensors. We have successfully grown Fe3O4 nanoparticles on cellulose/GO hydrogels by a two step method. This method produced cellulose/GO/Fe3O4 composites which Fe3O4 nanoparticles uniformly and densely coated on the surface of GO and cellulose. The resulting conposites show superrior and durability catalytic activity to cellulose/Fe3O4 composites. This behaviour was due to functional effect and synergistic structural of the combined Fe3O4 nanoparticles and GO. We expect that the composite hydrogels could also be useful for the degradation of other dye contaminated wastewaters. Our method could be futher extended to grow other functional materials on cellulose or cellulose/GO composites for advanced materials. MWCNT/cellulose composite fibers were spun using an aqueous NaOH/urea system as solvent. The resulting fibers are lightweight, flexible and exhibit good mechanical properties. The embedded CNT network introduces a high electrical conductivity, with volume resistivities in the range of about 230−1 Ohm cm for 2−8 wt % CNT loading. This intrinsic conductivity as well as the response of the fiber microstructure to external stimuli is fundamental for the impressive multifunctional sensing abilities of the composite fibers with respect to tensile strain, temperature and environmental humidity. In particular, these novel CNT/cellulose composite fibers are ideally suited to serve as highly sensitive, well reversible and reusable detectors or switches for liquid water. Based on their unique (structural) properties, the fibers may be processed into wearable electronic devices (textile sensors and actuators). Due to their unique characteristics and excellent sensing abilities, therefore, materials based on cellulose and nanocarbons have great opportunities to be further developed and used in many fields as smart and functional materials.
Publications
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(2018) Cellulose-carbon nanotube composite aerogels as novel thermoelectric materials. Composites Science and Technology 163 133–140
Gnanaseelan, Minoj; Chen, Yian; Luo, Jinji; Krause, Beate; Pionteck, Jürgen; Pötschke, Petra; Qi, Haisong
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(2018) Smart cellulose/graphene composites fabricated by in situ chemical reduction of graphene oxide for multiple sensing applications. J. Mater. Chem. A (Journal of Materials Chemistry A) 6 (17) 7777–7785
Chen, Yian; Pötschke, Petra; Pionteck, Jürgen; Voit, Brigitte; Qi, Haisong
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Novel carbon nanotube/Cellulose composite fibers as multifunctional materials. ACS Appl. Mater. Interfaces, 2015, 7, 22404−22412
Haisong Qi, Björn Schulz, Thomas Vad, Jianwen Liu, Edith Mäder, Gunnar Seide, Thomas Gries
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Functional Polymeric Materials Based on Cellulose. International Journal of Polymer Science, 2016, Article ID 5176968
Haisong Qi, Ang Lu, Qingbin Zheng, Quanling Yang
