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14 February 2019 Surface plasmon resonance sensor based on cross-linked chitosan immobilized onto the surface of optimization AgAu composite film for trace copper(II) ions detection
Wenhua Wang, Xinlei Zhou, Shengxu Wu, Sidong Li, Weina Wu, Zhengye Xiong, Wenqing Shi, Jiang Huang, Qingxu Yu
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Optical Engineering, Vol. 58, Issue 2, 027111 (February 2019). https://doi.org/10.1117/1.OE.58.2.027111
Abstract
We propose an intensity-modulated surface plasmon resonance (SPR) sensor based on a four-layer Kretschmann structural model. To achieve high-sensitivity intensity detection for the measured sample, a silver/gold (Ag/Au) composite film structure is proposed and optimized by a numerical simulation method, and then the chitosan thin film modified by glutaraldehyde cross-linked as an active layer for adsorbing measured sample is applied and immobilized onto the surface of the Ag/Au composite film by spin-coating technique. In addition, a reference beam is introduced into the system to raise its resolution and stability. Measurements are taken while varying the trace copper(II) ion (Cu2  +  ) concentration from 0 to 5 ppm, and the SPR sensor is found to possess sensitivities of 0.9147 and 0.4466  ppm  −  1 at Cu2  +   concentrations of 0 to 3 and 3 to 5 ppm, respectively. The concentration resolution is 0.015 and 0.030 ppm for the trace Cu2  +   concentration of 0 to 3 and 3 to 5 ppm, respectively.
© 2019 Society of Photo-Optical Instrumentation Engineers (SPIE) 0091-3286/2019/$25.00 © 2019 SPIE
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Wenhua Wang, Xinlei Zhou, Shengxu Wu, Sidong Li, Weina Wu, Zhengye Xiong, Wenqing Shi, Jiang Huang, and Qingxu Yu "Surface plasmon resonance sensor based on cross-linked chitosan immobilized onto the surface of optimization AgAu composite film for trace copper(II) ions detection," Optical Engineering 58(2), 027111 (14 February 2019). https://doi.org/10.1117/1.OE.58.2.027111
Received: 25 October 2018; Accepted: 31 January 2019; Published: 14 February 2019
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KEYWORDS
Sensors
Copper
Composites
Surface plasmons
Silver
Gold
Prisms
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