Engineering the Charge Transport of Ag Nanocrystals for Highly Accurate, Wearable Temperature Sensors through All-Solution Processes

Hyungmok Joh, Seung Wook Lee, Mingi Seong, Woo Seok Lee, Soong Ju Oh

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

All-nanocrystal (NC)-based and all-solution-processed wearable resistance temperature detectors (RTDs) are introduced. The charge transport mechanisms of Ag NC thin films are engineered through various ligand treatments to design high performance RTDs. Highly conductive Ag NC thin films exhibiting metallic transport behavior with high positive temperature coefficients of resistance (TCRs) are achieved through tetrabutylammonium bromide treatment. Ag NC thin films showing hopping transport with high negative TCRs are created through organic ligand treatment. All-solution-based, one-step photolithography techniques that integrate two distinct opposite-sign TCR Ag NC thin films into an ultrathin single device are developed to decouple the mechanical effects such as human motion. The unconventional materials design and strategy enables highly accurate, sensitive, wearable and motion-free RTDs, demonstrated by experiments on moving or curved objects such as human skin, and simulation results based on charge transport analysis. This strategy provides a low cost and simple method to design wearable multifunctional sensors with high sensitivity which could be utilized in various fields such as biointegrated sensors or electronic skin.

Original languageEnglish
Article number1700247
JournalSmall
Volume13
Issue number24
DOIs
Publication statusPublished - 2017 Jun 27

Fingerprint

Temperature sensors
Nanoparticles
Nanocrystals
Charge transfer
Temperature
Thin films
Detectors
Skin
Ligands
Positive temperature coefficient
Negative temperature coefficient
Photolithography
Wearable sensors
Sensors
Costs and Cost Analysis
Equipment and Supplies
Costs
Experiments

Keywords

  • charge transport
  • ligand exchange
  • resistance temperature detectors
  • silver nanocrystals
  • wearable sensors

ASJC Scopus subject areas

  • Biotechnology
  • Biomaterials
  • Chemistry(all)
  • Materials Science(all)
  • Engineering (miscellaneous)

Cite this

Engineering the Charge Transport of Ag Nanocrystals for Highly Accurate, Wearable Temperature Sensors through All-Solution Processes. / Joh, Hyungmok; Lee, Seung Wook; Seong, Mingi; Lee, Woo Seok; Oh, Soong Ju.

In: Small, Vol. 13, No. 24, 1700247, 27.06.2017.

Research output: Contribution to journalArticle

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