| 研究開始時の研究の概要 |
Biomass is a sustainable and environment-friendly resource on the earth which plays an important role in human life, especially bio-nanofiber materials with high strength, specific surface area and transparency. However, as insulators, bio-nanofibers have difficulty to be applied to electronics without hybridizing with other conductive materials. Therefore, we’d like to impart the electrical conductivity to bio-nanofibers by some green methods such as carbonization and laser irradiation, which could broaden their electrical applications such as sensors, supercapacitors and actuators.
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| 研究実績の概要 |
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 paper
Cellulose 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 performances
Pyrolysis 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).
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