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Eco-friendly devices and sensors |
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High-efficiency photo-electron conversion devices Semiconductor processes and nanofabrication Characterizations and applications of nanomaterials Optical characterization of graphene Graphene-gold oxide photodetector Optical analysis of hollow gold nanoparticles Photomodification of hollow gold nanoparticles for high-density data storage Light harvesting and light extraction Light extraction efficiency of LEDs Antireflection structures for solar cells Optical analysis techniques Eco-friendly devices and sensors
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Eco-Friendly Plasmonic Sensors: Using the Photothermal Effect to Prepare Metal Nanoparticle-Containing Test Papers for Highly Sensitive Colorimetric Detection Convenient, rapid, and accurate detection of chemical and biomolecules would be a great benefit to medical, pharmaceutical, and environmental sciences. Many chemical and biosensors based on metal nanoparticles (NPs) have been developed. However, as a result of the inconvenience and complexity of most of the current preparation techniques, surface plasmon-based test papers are not as common as, for example, litmus paper, which finds daily use. In this paper, we propose a convenient and practical technique, based on the photothermal effect, to fabricate the plasmonic test paper. This technique is superior to other reported methods for its rapid fabrication time (a few seconds), large-area throughput, selectivity in the positioning of the NPs, and the capability of preparing NP arrays in high density on various paper substrates. In addition to their low cost, portability, flexibility, and biodegradability, plasmonic test paper can be burned after detecting contagious biomolecules, making them safe and eco-friendly. |
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(a) Schematic representation of the preparation of the NP-containing test paper. (b) Photographic images of Ag (left) and Au (right) NPcontaining test papers prepared from photographic paper, inkjet printing paper, waxed paper, and nonwoven fiber sheets (from top to bottom). (c) Absorbance and reflectance spectra of Au and Ag films having a thickness of 15 nm. (d, e) Reflectance spectra of (d) Au NP- and (e) Ag NPcontaining test papers prepared from photographic paper and (f, g) transmission spectra of (f) Au NP- and (g) Ag NP-containing test papers prepared from waxed paper, with different numbers of shots of laser irradiation. |
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Copyright(c) 2008 Nano-optpelectronics Lab., Department of Material Science and Engineering, National Taiwan University No. 1, Sec. 4, Roosevelt Road, Taipei, 10617 Taiwan(R.O.C) Phone：+886-2-3366-3240 Fax：+886-2-2362-7651 |
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