Analytical and Bioanalytical Chemistry

, Volume 406, Issue 16, pp 3985–3994

A miniature electronic nose system based on an MWNT–polymer microsensor array and a low-power signal-processing chip

  • Shih-Wen Chiu
  • Hsiang-Chiu Wu
  • Ting-I Chou
  • Hsin Chen
  • Kea-Tiong Tang
Research Paper

DOI: 10.1007/s00216-013-7547-0

Cite this article as:
Chiu, SW., Wu, HC., Chou, TI. et al. Anal Bioanal Chem (2014) 406: 3985. doi:10.1007/s00216-013-7547-0
Part of the following topical collections:
  1. Chemosensors and Chemoreception

Abstract

This article introduces a power-efficient, miniature electronic nose (e-nose) system. The e-nose system primarily comprises two self-developed chips, a multiple-walled carbon nanotube (MWNT)–polymer based microsensor array, and a low-power signal-processing chip. The microsensor array was fabricated on a silicon wafer by using standard photolithography technology. The microsensor array comprised eight interdigitated electrodes surrounded by SU-8 “walls,” which restrained the material–solvent liquid in a defined area of 650 × 760 μm2. To achieve a reliable sensor-manufacturing process, we used a two-layer deposition method, coating the MWNTs and polymer film as the first and second layers, respectively. The low-power signal-processing chip included array data acquisition circuits and a signal-processing core. The MWNT–polymer microsensor array can directly connect with array data acquisition circuits, which comprise sensor interface circuitry and an analog-to-digital converter; the signal-processing core consists of memory and a microprocessor. The core executes the program, classifying the odor data received from the array data acquisition circuits. The low-power signal-processing chip was designed and fabricated using the Taiwan Semiconductor Manufacturing Company 0.18-μm 1P6M standard complementary metal oxide semiconductor process. The chip consumes only 1.05 mW of power at supply voltages of 1 and 1.8 V for the array data acquisition circuits and the signal-processing core, respectively. The miniature e-nose system, which used a microsensor array, a low-power signal-processing chip, and an embedded k-nearest-neighbor-based pattern recognition algorithm, was developed as a prototype that successfully recognized the complex odors of tincture, sorghum wine, sake, whisky, and vodka.

Figure

The miniature e-nose device prototype

Keywords

Electronic nose Conductive microsensor array Multiple-walled carbon nanotube Signal-processing chip 

Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Shih-Wen Chiu
    • 1
  • Hsiang-Chiu Wu
    • 2
  • Ting-I Chou
    • 1
  • Hsin Chen
    • 2
  • Kea-Tiong Tang
    • 1
  1. 1.Department of Electrical EngineeringNational Tsing Hua UniversityHsinchuTaiwan
  2. 2.Institute of Electronics EngineeringNational Tsing Hua UniversityHsinchuTaiwan

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