Presentation Information
[10a-E207-4]Phonon properties along the c-axis of single-crystalline graphite nanofilms and their application to ultrasensitive acoustic biosensing
Shuhei Izuma1, Masamitsu Tachibana2, Mutsuaki Murakami2, 〇Hirotsugu Ogi1 (1.Univ. Osaka, 2.KanekaCo.)
Keywords:
graphite,picosecond ultrasound,biosensor
Using the micro-picosecond ultrasonics, we discuss unique phonon characteristics by measuring coherent phonons along the c-axis in nearly defect-free graphite thin films. We also developed a resonator biosensor using a freestanding graphite film of ~50 nm thick and for detecting biomarkers in serum. It was found that the principle enabling ultra-high-sensitivity detection was caused not by the mass-loading effect of the target protein, but by the coupling between the resonance of the graphite thin film and that between the proteins.