ORALS

Actuality of the research is determined by needs of modern optics and electronics, because it is well known that modern technologies for the vast majority of electronic and optoelectronic devices, both for household and special purpose, are based on materials harmful to humans and environment. Further development of heterostructures based on traditional materials is limited by the need to harmonize the properties of individual components at the interface. Such limitations are not principal for hybrid composites, where the matrix and its filling components (fillers) interact relatively "weakly" with each other. Then, "strong" interactions within the components provide their stability, while "weak" - allow to find the combinations of components providing necessary properties of a composite as a whole [1]. We described here hybrid composite materials based on natural polymer matrix (micro/nanosized cellulose, MC/NC) incorporated with three types of fillers: microcrystalline cellulose (MCC), graphene oxide (GO), and nanosized dielectric oxides (DO). The fillers should improve or modify, each in its own direction, the properties of the matrix, and they should bring to the composite their own properties uncharacteristic to matrix. Short review about background of this science direction was given (see, e.g. [2, 3]). New data obtained in our R&D team about cellulose composites are described. Simple oxides (ZnO, ZrO2 nanopaticles co-doped with europium and fluorine ions) as well as complex oxides (bismuth and lanthanum phosphates doped with luminescent RE ions) were incorporated into MC/NC matrix. Morphology, moisture resistance, conductivity, dielectric, optical absorption and luminescence properties of the composites have been studied and analyzed together with data about of starting components properties [4]. Obtained results confirmed the perspectives of practical use of the composites under study.

References:
[1] P.H.C. Camargo, K.G. Satyanarayana, F. Wypych. Nanocomposites: Synthesis, Structure, Properties and New Application Opportunities. Materials Research, Vol. 12, No. 1, P. 1-39, 2009.
[2] Lei Gao, Lingfeng Chao, Meihui Hou, Jin Liang, Yonghua Chen, Hai-Dong Yu, Wei Huang. Flexible, transparent nanocellulose paper-based perovskite solar cells. npj Flexible Electronics (2019) 3:4, 8 pp.
[3] P. Panchal, E. Ogunsona, T. Mekonnen. Trends in Advanced Functional Material Applications of Nanocellulose. Processes 2019, 7, 10 – 31
[4] V. Chornii, M. Lazarenko, S.G. Nedilko, et al. Mechanical, Dielectric, and Spectroscopic Characteristics of “Micro/Nanocellulose +Oxide” Composites. Nanoscale Research Letters. – 2017. – V. 12. – P. 98 (11 pp).