[10a-E207-1~6] 22.1 Joint Session M "Phonon Engineering"

10:45 AM - 11:00 AM JST(1:45 AM - 2:00 AM UTC)

[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.