Deformable carbon nanotube-contact pads for inertial microswitch to extend contact time

Jae Ik Lee, Youngsup Song, Hakkyun Jung, Jungwook Choi, Youngkee Eun, Jongbaeg Kim

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)


We have demonstrated a batch-fabricated inertial microswitch with extended contact time using carbon nanotube (CNT)-contact pads. Self-assembled and aligned CNT bundles, as deformable electromechanical contact pads are selectively synthesized on fully fabricated single crystal silicon microstructures. Outstanding mechanical flexibility and resilience, as well as electrical conductivity of CNTs, make them suitable as an electromechanical contact material. It is experimentally verified that the elastic deformation of CNTs dramatically enhances the contact time of the inertial microswitch from 7.5 μs to 114 μs. Due to the prolonged contact time, the presented inertial microswitch provides reliable and easy detection of threshold acceleration, which is crucial in diverse commercial applications such as airbag restraint systems in vehicles or geriatric healthcare systems.

Original languageEnglish
Article number5977025
Pages (from-to)4914-4920
Number of pages7
JournalIEEE Transactions on Industrial Electronics
Issue number12
Publication statusPublished - 2012

Bibliographical note

Funding Information:
Manuscript received February 25, 2011; revised June 6, 2011; accepted July 16, 2011. Date of publication August 8, 2011; date of current version July 2, 2012. This work was supported by the Fusion Research Program for Green Technologies (2010-0019088) and the Basic Science Research Program (2011-0002585) through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology, and the New & Renewable Energy of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) funded by the Korean Government Ministry of Knowledge Economy (2008-N-PV08-P-06-0-000).

All Science Journal Classification (ASJC) codes

  • Control and Systems Engineering
  • Electrical and Electronic Engineering


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