Kyoung-Ryul Lee Seo,Jae Min Sang, Kwon Sun 김남윤 Yi, Jae Lee Son, Jeong Gon Lee, Soo Hyun 2024-01-12T02:32:26Z 2024-01-12T02:32:26Z 2023-01-30 2023-02 1944-8244 https://pubs.kist.re.kr/handle/201004/75812 Graphene/polymer actuators were developed using bilayer graphene and various polymer substrates for use as transparent, flexible, and robust electrostatic speaker units. Additionally, a resonant frequency shift was induced using a polymer substrate on which various micropatterns were transferred to boost bass. The total sound pressure level (SPL) in the graphene/polymer actuator was measured by a sweep, and the frequency of the spectrum was confirmed to be one-third that of the octave band frequency. The change in the vibroacoustic characteristic with changes in Young’s modulus and density was studied for the polymers of the same size and thickness. Particularly, the possibility of boosting bass was confirmed by inducing a resonant frequency shift and increasing the total SPL by adding micropatterns on a polymer substrate under the same conditions. The resonance frequency of 523 Hz and the SPL of 54 dBA in flat polymer film became 296 Hz and 69 dBA in a specific pattern, which produced a sound of >15 dB based on the same flat polymer. We expect that the design and information provided herein can provide the key parameters required to change the resonant frequency in small-size devices for the application of graphene/polymer thin-film actuators. English American Chemical Society Vibroacoustic Characteristics of a Specific Patterned Polymer with Graphene for an Electrostatic Speaker Article 10.1021/acsami.2c15921 1 ACS Applied Materials & Interfaces, v.15, no.5, pp.7319 - 7328 ACS Applied Materials & Interfaces 15 5 7319 7328 N scie scopus 000925778000001 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Science & Technology - Other Topics Materials Science Article; Early Access MONOLAYER GRAPHENE SOUND RADIATION VIBRATION PERFORMANCE TRANSPARENT RESONATORS RESONANCE MEMBRANE DESIGN FILMS graphene/polymer actuator micro-patterned polymer frequency shift electrostatic speaker bass boost