Cited by 959Nanowire Synthesis and ApplicationsGas Sensing Nanomaterials and SensorsAdvanced Sensor and Energy Harvesting Materials

Highly ordered nanowire arrays on plastic substrates for ultrasensitive flexible chemical sensors

Open access
McAlpine, Michael C., Ahmad, Habib, Wang, Dunwei, Heath, James R.·2007·Nature Materials

Abstract

The development of a robust method for integrating high-performance semiconductors on flexible plastics could enable exciting avenues in fundamental research and novel applications. One area of vital relevance is chemical and biological sensing, which if implemented on biocompatible substrates, could yield breakthroughs in implantable or wearable monitoring systems. Semiconducting nanowires (and nanotubes) are particularly sensitive chemical sensors because of their high surface-to-volume ratios. Here, we present a scalable and parallel process for transferring hundreds of pre-aligned silicon nanowires onto plastic to yield highly ordered films for low-power sensor chips. The nanowires are excellent field-effect transistors, and, as sensors, exhibit parts-per-billion sensitivity to NO2, a hazardous pollutant. We also use SiO2 surface chemistries to construct a 'nano-electronic nose' library, which can distinguish acetone and hexane vapours via distributed responses. The excellent sensing performance coupled with bendable plastic could open up opportunities in portable, wearable or even implantable sensors.

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54 of 54 references verified0 citation errors · 0 not checkable

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  • Wearable sensor technologies are essential for personalized medicine through continuous monitoring of an individual's health.

    “Wearable sensor technologies are essential to the realization of personalized medicine through continuously monitoring an individual's state of health1–12.”

    From Fully integrated wearable sensor arrays for multiplexed in situ perspiration analysis (2016) · cites this paper as [5]

    The Abstract (p. 1) says flexible chemical and biological sensors could enable wearable monitoring systems. It does not establish that wearable sensors are essential to personalized medicine or that they continuously monitor an individual's health; those claims are stronger and more specific than the paper's proposed application. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • Wearable sweat sensors address the limitation of traditional sweat testing by enabling in situ sweat measurements with real-time feedback, creating potential for preventive care, timely diagnosis, and treatment.

    “By taking advantage of flexible and hybrid electronics (13–17), wearable sweat sensors address this limitation by enabling in situ sweat measurements with real-time feedback, creating potential for preventive care, timely diagnosis, and treatment (18–34).”

    From Regional and correlative sweat analysis using high-throughput microfluidic sensing patches toward decoding sweat (2019) · cites this paper as [16]

    The Abstract (p. 1) proposes flexible sensors for possible wearable monitoring, while Flexible Nanowire Vapour Sensors (pp. 4–5) describes tests with NO₂, acetone and hexane vapours. Our copy does not address traditional sweat testing, in situ sweat measurement, real-time feedback or the stated care benefits (searched: sweat sensing, traditional sweat testing, preventive care). In the printed sentence, this paper appears relevant to the earlier flexible-electronics citation group, not the later sweat-sensor claim. (LLM, conf=0.76)

    Experimental — accuracy not yet measured

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Research works printed but not linked: 2

  1. [4]4. Uchikoga S. Low-temperature polycrystalline silicon thin-film transistor technologies for systemon-glass displays. Mater. Res. Soc. Bull. 2002; 27:881-885.
  2. [43]43. Shieh J, Feng HM, Hon MH, Juang HY. WO 3 and W-Ti-O thin-film gas sensors prepared by solgel dip-coating. Sensors Actuators B. 2002; 86:75-80.

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Authors
McAlpine, M. C., Ahmad, H., Wang, D., & Heath, J. R.
Affiliations
California Institute of Technology (US)
Corresponding author
Heath, James R.
Venue
Nature Materials
Published
2007-04-22
Volume
6
Issue
5
Pages
379-384
ISSN
  • 1476-1122 (ISSN-L)
  • 1476-4660
OpenAlex
W2161552938
Cited by
959
References
54
Citations by year
2026: 10 · 2025: 12 · 2024: 14 · 2023: 24 · 2022: 31 · 2021: 34 · 2020: 44 · 2019: 41 · 2018: 64 · 2017: 60 · 2016: 73 · 2015: 72 · 2014: 73 · 2013: 89 · 2012: 81
FWCI
39.92
Type
journal article
Language
en
Open access
Locations
  • Nature Materials (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • CaltechAUTHORS (California Institute of Technology) (submittedVersion)
Funders
  • National Institutes of Health (5u54ca119347-03)
  • National Cancer Institute (5U54 CA119347, U54-CA119347)
Topics
  • Physical Sciences › Engineering › Biomedical Engineering › Nanowire Synthesis and Applications
  • Physical Sciences › Engineering › Electrical and Electronic Engineering › Gas Sensing Nanomaterials and Sensors
  • Physical Sciences › Engineering › Biomedical Engineering › Advanced Sensor and Energy Harvesting Materials
Keywords
silicon nanowires, nanowire arrays, plastic substrates, field-effect transistors, NO2 gas sensing, gas sensors, nanowire transfer, wearable sensors, implantable sensors
MeSH terms
Chemistry Techniques, Analytical, Plastics, Semiconductors, Silicon, Biosensing Techniques, Nanowires

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