Abstract
The integration of nanomaterials such as carbon nanotubes (CNTs) into microsystems is highly desirable, in order to make use of the unique nanomaterial properties in real devices. However, the CNT-to-microsystem integration is challenging to implement in a manufacturable, cost-effective industrial process. This text presents our work towards a process for making complete CMOS/MEMS systems with integrated CNTs. We demonstrate the feasibility of the process, using room-temperature processing, low-cost equipment and consumables, and electrical control with automation possibilities. CNTs are directly integrated at the desired positions in the Si microsystem, forming closed Si/CNT/Si circuits. An applied electric field during manufacturing ensures that the CNTs forming those circuits are well defined, thin and straight. We explore different designs with the aim to obtain uniform and well-defined CNT synthesis conditions and show that simplified designs can perform comparable to more complex ones. The Si/CNT/Si circuits obtained can show rectifying (Schottky-like) or near-ohmic behaviour. Gas sensing possibilities are demonstrated, indicating the possibility of monitoring ageing/fermenting of food. Functionalization of CNTs is demonstrated, using thermal evaporation of Sn and Pd, opening for selective and sensitive sensors for various gases and analytes. Detailed microscopic characterization of the obtained CNTs is presented.
This book chapter is based to a large extent on the article, reproduced with permission: K.E. Aasmundtveit, B.Q. Ta, Q-H Nguyen, T.B. Haugen, N. Hoivik, E. Halvorsen “Local synthesis of carbon nanotubes for direct integration in Si microsystems—design considerations,” Advances in Manufacturing, vol. 1, (2013), p 218–225.
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Acknowledgments
The Research Council of Norway is acknowledged for grants to support the NORFAB infrastructure. My colleagues and coworkers, Profs. Einar Halvorsen and Nils Hoivik, are greatly acknowledged for their contributions in this shared research task. Many thanks to present and former students, without whose efforts this research had not been possible: Bao Quoc Ta, Quoc-Huy Nguyen, Tormod B. Haugen, Van Anh Ngo and T.A. Thy Nguyen.
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Aasmundtveit, K.E. (2015). Direct Integration of Carbon Nanotubes in Si Microsystems. In: Baillin, X., Joachim, C., Poupon, G. (eds) Nanopackaging: From Nanomaterials to the Atomic Scale. Advances in Atom and Single Molecule Machines. Springer, Cham. https://doi.org/10.1007/978-3-319-21194-7_4
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DOI: https://doi.org/10.1007/978-3-319-21194-7_4
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