Structural Analysis and Functional Development of Carbonized Bio-Nanofiber

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In this year, I finished the following research.1. All-cellulose-derived humidity sensor prepared by direct laser writing of electrodes on TEMPO-oxidized cellulose paperCellulose is humidity-sensing due to many hydrophilic groups. However, the electrical insulation of cellulose makes nonrenewable noble metal electrodes essential to effectively detect electrical signals. Herein, I prepared sustainable laser-carbonized electrodes with good electrical conductivity and moisture-stable performance on TEMPO-oxidized cellulose paper. This all-cellulose-derived humidity sensor showed high sensitivity and linearity, and it can be used to monitor different biological activities. The research was published in Journal of Materials Chemistry C as an Inside Back Cover Paper (IF: 7.39, DOI: 10.1039/d1tc05339f). Moreover, I received an Excellent Poster Award at the 28th Annual Meeting of the Cellulose Society of Japan.2. Polydopamine doping and pyrolysis of cellulose nanofiber paper for three-dimensional (3D) nanocarbon with improved yield and capacitive performancesPyrolysis of cellulose inevitably causes drastic carbon loss and volume shrinkage. I found that a small amount of polydopamine doping before pyrolysis can improve the yield and volume retention of cellulose derived nanocarbon. The pyrolyzed polydopamine-doped cellulose nanofiber paper had a larger specific surface area and electrical conductivity, therefore affording better specific capacitance as a supercapacitor electrode. This research was published in Nanomaterials as a Feature Paper (IF: 5.08, DOI: 10.3390/nano11123249).