Flexible-detachable dual-output sensors of fluid temperature and dynamics based on structural design of thermoelectric materials

Byungseok Seo, Hayoung Hwang, Sunggu Kang, Youngsun Cha, Wonjoon Choi

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


Multifunctionalities with self-powered capability are crucial for miniaturized, scattered devices to sense temperature and dynamics of fluids, which are intrinsic parameters to monitor environmental or industrial features. Herein, we present flexible-detachable dual-output fluid sensors employing the structural design of thermoelectric materials (SDTMs) that are artificially patterned TMs. The SDTMs enable the successive thermoelectric waves as the raw voltage signals with two distinct peaks that can reflect fluid temperature and dynamics, in contact with working fluids. The 1st-peak voltage provides the precise sensing of fluid temperature, while the duration between 1st- and 2nd-peaks indicates the moving velocity. A flexible-detachable SDTM-based sensor comprising of pre-designed Bi2Te3 pattern between cellulose and PET substrates performs high-resolution sensing of temperature and velocity (< 0.19 K and < 0.03 cm/s) and facilitates the sticker-like functions through high-reproducibility (> 93%) of sensing under transfers between flat and curved surfaces. Furthermore, a scalable sensor array (4-by-4 SDTMs array at 16 pixels) is developed as a large-area device for real-time detection of fluid temperature and dynamics at multiple positions, accompanying with self-power generation of 42 μW/cm2. The new methodology using SDTMs can contribute to developing next-generation sensors having advanced features, such as multi-detection and diversely integrated flexible-detachable functions.

Original languageEnglish
Pages (from-to)733-743
Number of pages11
JournalNano Energy
Publication statusPublished - 2018 Aug


  • Bismuth telluride
  • Flexible-detachable sensor
  • Fluid temperature-velocity sensor
  • IoT sensor
  • Self-powered sensor
  • Thermoelectric waves

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)
  • Electrical and Electronic Engineering


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