Yudyanto, Y.; Masruroh, M.; Santjojo, D. J. .; Sakti, S. P. .; Wardoyo, A. Y. P. Investigation of Acoustic Impedance and Morphology of Vacuum-Thermally Evaporated Polypyrrole Layer and Its Potential for Quartz Crystal Microbalance Sensor. Trends Sci 2025, 22, 9264.