resumo
Nowadays, the development of sustainable high-performance functional nanomaterials is in the spotlight. In this work, we report the preparation of a new generation of flexible and high electroconductive nanopapers based on nanofibrillated cellulose (NFC) and copper nanowires (CuNWs). Homogeneous red brick color nanopapers (thickness 30.2-36.4 mu m) were obtained by mixing different amounts of NFC aqueous suspensions and CuNWs (1, 5, 10, 20, and 50 wt %), followed by vacuum filtration and drying. scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) analysis confirmed the incorporation of the different amounts of CuNWs, and their uniform and random distribution. All of the nanomaterials displayed good mechanical properties, viz., Young's modulus = 2.62-4.72 GPa, tensile strength = 30.2-70.6 MPa, and elongation at break = 2.3-4.1% for the nanopapers with 50 and 1 wt % of CuNWs mass fraction, respectively. The electrical conductivity of these materials strongly depends on the CuNW content, attaining a value of 5.43 x 10(4) S.m(-1) for the nanopaper with a higher mass fraction. This is one of the highest values reported so far for nanocellulose-based conductive materials. Therefore, these nanopapers can be seen as an excellent inexpensive and green alternative to the current electroconductive materials for applications in electronic devices, energy storage, or sensors.
palavras-chave
EFFICIENT HETEROGENEOUS CATALYST; GRAPHENE COMPOSITE FILM; CELLULOSE NANOFIBERS; TRANSPARENT; NANOPARTICLES; OXIDATION; CONDUCTIVITY; ELECTRONICS; FABRICATION; NANOTUBES
categoria
Science & Technology - Other Topics; Materials Science
autores
Pinto, RJB; Martins, MA; Lucas, JMF; Vilela, C; Sales, AJM; Costa, LC; Marques, PAAP; Freire, CSR
nossos autores
Carla Vilela
Professor Auxiliar
Carmen Sofia da Rocha Freire Barros
Investigador Coordenador
Ricardo Pinto
Investigadoragradecimentos
This work was developed within the scope of the project CICECO-Aveiro Institute of Materials, UIDB/50011/2020 and UIDP/50011/2020, financed by national funds through the Foundation for Science and Technology/MCTES. It was done in cooperation with TEMA supported by the projects UIDB/00481/2020 and UIDP/00481/2020.FCT (Fundacao para a Ciencia e a Tecnologia); and CENTRO-01-0145-FEDER-022083.Centro Portugal Regional Operational Programme (Centro2020), under the PORTUGAL 2020 Partnership Agreement, through the European Regional Development Fund. The research contract of R.J.B. Pinto was funded by national funds (OE), through FCT in the scope of the framework contract foreseen in the numbers 4, 5, and 6 of the article 23, of the Decree-Law 57/2016, of August 29, changed by Law 57/2017, of July 19. The FCT is also acknowledged for the research contract under the Stimulus of Scientific Employment to C. Vilela (CEECIND/00263/2018). This work was also developed in the scope of the project of the Instituto de Nanoestruturas, Nanomodelacao e Nanofabricacao. UID/CTM/50025, financed by national funds through the FCT/MCTES(PIDDAC) through national funds and where applicable co-financed by the FEDER (POCI-01-0145FEDER007688), under the Partnership Agreement COMPETE PT2020.Competitiveness and Internationalization Operational Program.