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Fiber surface modification technology for fiber-optic localized surface plasmon resonance biosensors.

Zhang Q, Xue C, Yuan Y, Lee J, Sun D, Xiong J - Sensors (Basel) (2012)

Bottom Line: Star-shaped gold nanoparticles obtained through the seed-mediated solution growth method were found to self-assemble on the surface of tapered optical fibers via amino- and mercapto-silane coupling agents.Assembly using star-shaped gold nanoparticles and amino/mercapto silane coupling agent are analyzed and compared.Experimental results of the transmission spectra show that the surface modified by the gold nanoparticles using MPTMS is firmer compared to that obtained using APTMS.

View Article: PubMed Central - PubMed

Affiliation: National Key Laboratory for Electronic Measurement Technology, North University of China, Taiyuan 030051, Shanxi, China. zhangq0902@163.com

ABSTRACT
Considerable studies have been performed on the development of optical fiber sensors modified by gold nanoparticles based on the localized surface plasmon resonance (LSPR) technique. The current paper presents a new approach in fiber surface modification technology for biosensors. Star-shaped gold nanoparticles obtained through the seed-mediated solution growth method were found to self-assemble on the surface of tapered optical fibers via amino- and mercapto-silane coupling agents. Transmitted power spectra of 3-aminopropyltrimethoxy silane (APTMS)-modified fiber were obtained, which can verify that the silane coupling agent surface modification method is successful. Transmission spectra are characterized in different concentrations of ethanol and gentian violet solutions to validate the sensitivity of the modified fiber. Assembly using star-shaped gold nanoparticles and amino/mercapto silane coupling agent are analyzed and compared. The transmission spectra of the gold nanoparticles show that the nanoparticles are sensitive to the dielectric properties of the surrounding medium. After the fibers are treated in t-dodecylmercaptan to obtain their transmission spectra, APTMS-modified fiber becomes less sensitive to different media, except that modified by 3-mercaptopropyltrimethoxy silane (MPTMS). Experimental results of the transmission spectra show that the surface modified by the gold nanoparticles using MPTMS is firmer compared to that obtained using APTMS.

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Schematic of gold nanoparticle self-assembly in MPTMS.
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f4-sensors-12-02729: Schematic of gold nanoparticle self-assembly in MPTMS.

Mentions: Figure 4 illustrates the principle of surface modification with gold nanoparticles and self-assembly procedures on the tapered fibers in MPTMS. MPTMS has methoxyl groups, whose hydrolysis product is silanol. Methoxyls interact with silanols absorbed on the surface. After the surface is washed to clear out the excess MPTMS, Si-O-Si bands form at high temperature, and self-assembled film with terminal mercapto groups is generated on the surface. Through the self-assembly process, gold nanoparticles can be modified using mercapto groups in Au-S bond [16].


Fiber surface modification technology for fiber-optic localized surface plasmon resonance biosensors.

Zhang Q, Xue C, Yuan Y, Lee J, Sun D, Xiong J - Sensors (Basel) (2012)

Schematic of gold nanoparticle self-assembly in MPTMS.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3376559&req=5

f4-sensors-12-02729: Schematic of gold nanoparticle self-assembly in MPTMS.
Mentions: Figure 4 illustrates the principle of surface modification with gold nanoparticles and self-assembly procedures on the tapered fibers in MPTMS. MPTMS has methoxyl groups, whose hydrolysis product is silanol. Methoxyls interact with silanols absorbed on the surface. After the surface is washed to clear out the excess MPTMS, Si-O-Si bands form at high temperature, and self-assembled film with terminal mercapto groups is generated on the surface. Through the self-assembly process, gold nanoparticles can be modified using mercapto groups in Au-S bond [16].

Bottom Line: Star-shaped gold nanoparticles obtained through the seed-mediated solution growth method were found to self-assemble on the surface of tapered optical fibers via amino- and mercapto-silane coupling agents.Assembly using star-shaped gold nanoparticles and amino/mercapto silane coupling agent are analyzed and compared.Experimental results of the transmission spectra show that the surface modified by the gold nanoparticles using MPTMS is firmer compared to that obtained using APTMS.

View Article: PubMed Central - PubMed

Affiliation: National Key Laboratory for Electronic Measurement Technology, North University of China, Taiyuan 030051, Shanxi, China. zhangq0902@163.com

ABSTRACT
Considerable studies have been performed on the development of optical fiber sensors modified by gold nanoparticles based on the localized surface plasmon resonance (LSPR) technique. The current paper presents a new approach in fiber surface modification technology for biosensors. Star-shaped gold nanoparticles obtained through the seed-mediated solution growth method were found to self-assemble on the surface of tapered optical fibers via amino- and mercapto-silane coupling agents. Transmitted power spectra of 3-aminopropyltrimethoxy silane (APTMS)-modified fiber were obtained, which can verify that the silane coupling agent surface modification method is successful. Transmission spectra are characterized in different concentrations of ethanol and gentian violet solutions to validate the sensitivity of the modified fiber. Assembly using star-shaped gold nanoparticles and amino/mercapto silane coupling agent are analyzed and compared. The transmission spectra of the gold nanoparticles show that the nanoparticles are sensitive to the dielectric properties of the surrounding medium. After the fibers are treated in t-dodecylmercaptan to obtain their transmission spectra, APTMS-modified fiber becomes less sensitive to different media, except that modified by 3-mercaptopropyltrimethoxy silane (MPTMS). Experimental results of the transmission spectra show that the surface modified by the gold nanoparticles using MPTMS is firmer compared to that obtained using APTMS.

Show MeSH
Related in: MedlinePlus