Designing Surface Chemistry of Silver Nanocrystals for Radio Frequency Circuit Applications

Hanju Oh, Seung Wook Lee, Minsoo Kim, Woo Seok Lee, Mingi Seong, Hyungmok Joh, Mark G. Allen, Gary S. May, Muhannad S. Bakir, Soong Ju Oh

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


We introduce solution-based, room temperature- and atmospheric pressure-processed silver nanocrystal (Ag NC)-based electrical circuits and interconnects for radio frequency (RF)/microwave frequency applications. We chemically designed the surface and interface states of Ag NC thin films to achieve high stability, dc and ac conductivity, and minimized RF loss through stepwise ligand exchange, shell coating, and surface cleaning. The chemical and structural properties of the circuits and interconnects affect the high-frequency electrical performance of Ag NC thin films, as confirmed by high-frequency electromagnetic field simulations. An all solution-based process is developed to build coplanar structures, in which Ag NC thin films are positioned at both sides of the substrates. In addition, we fabricated flexible transmission lines and broadband electrical circuits for resistors, interdigitated capacitors, spiral and omega-shaped inductors, and patch antennas with maximum inductance and capacitance values of 3 nH and 2.5 pF at frequencies up to 20 GHz. We believe that our approach will lead to a cost-effective realization of RF circuits and devices in which sensing and wireless communication capabilities are combined for internet-of-things applications.

Original languageEnglish
Pages (from-to)37643-37650
Number of pages8
JournalACS Applied Materials and Interfaces
Issue number43
Publication statusPublished - 2018 Oct 31


  • nanocrystals
  • patch antenna
  • radio frequency passive circuits
  • surface engineering
  • transmission line

ASJC Scopus subject areas

  • Materials Science(all)


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