Yudyanto, Yudyanto, Masruroh Masruroh, Dionysius J.D.H. Santjojo, Setyawan P. Sakti, and Arinto Yudi Ponco Wardoyo. 2025. “Investigation of Acoustic Impedance and Morphology of Vacuum-Thermally Evaporated Polypyrrole Layer and Its Potential for Quartz Crystal Microbalance Sensor”. Trends in Sciences 22 (3). Nakhon Si Thammarat, Thailand:9264. https://doi.org/10.48048/tis.2025.9264.