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Sensors 2011, 11(9), 8643-8653; doi:10.3390/s110908643
Article

Ethanol Vapor Sensing Properties of Triangular Silver Nanostructures Based on Localized Surface Plasmon Resonance

1,2,* , 2
,
2
,
2
 and
2
1 Department of Communication Engineering, Chengdu University of Information Technology, Chengdu 610225, China 2 State Key Lab of Optical Technologies for Microfabrication, Institute of Optics and Electronics, Chinese Academy of Science, Chengdu 610209, China
* Author to whom correspondence should be addressed.
Received: 25 July 2011 / Revised: 28 August 2011 / Accepted: 31 August 2011 / Published: 5 September 2011
(This article belongs to the Section Chemical Sensors)
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Abstract

A sensitive volatile organic vapor sensor based on the LSPR properties of silver triangular nanoprisms is proposed in this paper. The triangular nanoprisms were fabricated by a nanosphere lithography (NSL) method. They have sharp vertices and edges, and are arranged in an ideal hexangular array. These characteristics ensure that they exhibit an excellent LSPR spectrum and a high sensitivity to the exterior environment changes. The LSPR spectra responding to ethanol vapor and four other volatile organic vapors—acetone, benzene, hexane and propanol—were measured with a UV-vis spectrometer in real time. Compared with the other four vapors, ethanol exhibits the highest sensitivity (~0.1 nm/mg L−1) and the lowest detection limit (~10 mg/L) in the spectral tests. The ethanol vapor test process is also fast (~4 s) and reversible. These insights demonstrate that the triangular nanoprism based nano-sensor can be used in ethanol vapor detection applications.
Keywords: localized surface plasmon resonance; volatile organic vapor; triangular nanoprism; sensitivity localized surface plasmon resonance; volatile organic vapor; triangular nanoprism; sensitivity
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Ma, W.; Yang, H.; Wang, W.; Gao, P.; Yao, J. Ethanol Vapor Sensing Properties of Triangular Silver Nanostructures Based on Localized Surface Plasmon Resonance. Sensors 2011, 11, 8643-8653.

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