Limits...
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.

Show MeSH

Related in: MedlinePlus

Transmittance of the modified fiber by MPTMS in two tests. (a) 1st test (b) 2nd test.
© Copyright Policy
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC3376559&req=5

f13-sensors-12-02729: Transmittance of the modified fiber by MPTMS in two tests. (a) 1st test (b) 2nd test.

Mentions: To verify reproducibility, we further performed tests on another MPTMS-modified fiber. It is seen from Figure 13 that the two tests displayed similar results. The peak value of the transmission spectra changed greatly when the MPTMS-modified fibers were immersed in different media in both tests. Note that different conditions of the surface modification lead to different curve shapes. The peak values of the transmission spectra in Figure 13 are different because the tapering conditions of the two fibers are not the same. With the same reagent but with different concentrations, the MPTMS-modified fibers decreased by 900 a.u. at 590 nm wavelength for in both the tests.


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)

Transmittance of the modified fiber by MPTMS in two tests. (a) 1st test (b) 2nd test.
© Copyright Policy
Related In: Results  -  Collection

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

f13-sensors-12-02729: Transmittance of the modified fiber by MPTMS in two tests. (a) 1st test (b) 2nd test.
Mentions: To verify reproducibility, we further performed tests on another MPTMS-modified fiber. It is seen from Figure 13 that the two tests displayed similar results. The peak value of the transmission spectra changed greatly when the MPTMS-modified fibers were immersed in different media in both tests. Note that different conditions of the surface modification lead to different curve shapes. The peak values of the transmission spectra in Figure 13 are different because the tapering conditions of the two fibers are not the same. With the same reagent but with different concentrations, the MPTMS-modified fibers decreased by 900 a.u. at 590 nm wavelength for in both the tests.

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