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Issue 10, 2013
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Ultrasensitive thin film infrared sensors enabled by hybrid nanomaterials

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Abstract

IR sensing is an important technology with applications in renewable energy, environmental science and medical engineering. Herein environment-friendly IR sensors based on the single-walled carbon nanotubecopper sulfide nanoparticle (SWNT–CuS NP) hybrid nanomaterials are reported. The IR response in the photocurrent of a SWNT–CuS NP hybrid thin-film sensor is significantly enhanced when the IR light illuminates the thin-film device asymmetrically. We show that the change of photocurrent is up to 300%, which is 10× to 100× larger than those of other reported nanomaterial-based IR sensors. The detection limit can be as low as 48 μW mm−2, among the lowest of the previously reported IR nanosensors. The dramatically enhanced sensitivity and detection limit are due to the temperature difference between the two junctions formed by the nanohybrid thin film and Cu-wire electrodes under asymmetric IR illumination, and the difference between the effective Seebeck coefficient of the nanohybrid thin film and that of the Cu wire. The IR sensor embedded in polydimethylsiloxane (PDMS) layers has been fabricated and tested, indicating its potential application as a flexible IR sensor.

Graphical abstract: Ultrasensitive thin film infrared sensors enabled by hybrid nanomaterials

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Publication details

The article was received on 14 Jan 2013, accepted on 19 Mar 2013 and first published on 22 Mar 2013


Article type: Paper
DOI: 10.1039/C3AN00106G
Citation: Analyst, 2013,138, 3053-3057
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    Ultrasensitive thin film infrared sensors enabled by hybrid nanomaterials

    Y. Tseng, Y. He and L. Que, Analyst, 2013, 138, 3053
    DOI: 10.1039/C3AN00106G

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