SERRS fiber probe: fabrication of silver nanoparticles at the aperture of an optical fiber used for SNOM

Kitahama, Yasutaka; Itoh, Tamitake; Aoyama, J.; Nishikata, Kentaro; Ozaki, Yukihiro

doi:10.1039/b909603e

Cited by 10 publications

(7 citation statements)

References 12 publications

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“…The use of fiber optics for sensing is of great interest when in situ/in vivo analysis is needed and/or a complex environment is encountered, 29 particularly in biomedical and environmental research. 28,30 SERS fiber sensors, 28,[30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46] especially the optrode type, are very attractive since they combine the merits from both the SERS technique and fiber optic sensors. Several fabrication procedures for the generation of SERS optrodes have been reported.…”

Section: Introductionmentioning

confidence: 99%

“…These include devices fabricated using advanced nanofabrication techniques; 30,46 optrodes prepared by nanostructures evaporated or sputtered on the fiber; 37,43,45,47 and optrodes where the nanoparticles were deposited using wet chemistry (self-assembly). 31,33,36,38 Recently, we developed a procedure for multiple depositions of Ag NPs on a glass substrate that resulted in great improvement in the SERS efficiency. 48 We followed that work by applying a similar deposition procedure to the fabrication of SERS optrodes using single mode fibers.…”

Section: Introductionmentioning

confidence: 99%

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Surface-enhanced Raman scattering (SERS) optrodes for multiplexed on-chip sensing of nile blue A and oxazine 720

et al. 2012

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The fabrication and on-chip integration of surface-enhanced Raman scattering (SERS) optrodes are presented. In the optrode configuration, both the laser excitation and the back-scattered Raman signal are transmitted through the same optical fiber. The SERS-active component of the optrode was fabricated through the self-assembly of silver nanoparticles on the tip of optical fibers. The application of SERS optrodes to detect dyes in aqueous solution indicated a limit of quantification below 1 nM, using nile blue A as a molecular probe. Using the optrode-integrated microfluidic chip, it was possible to detect several different dyes from solutions sequentially injected into the same channel. This approach for sequential detection of different analytes is applicable to monitoring on-chip chemical processes. The narrow bandwidth of the vibrational information generated by SERS allowed solutions of different compositions of two chemically similar dyes to be distinguished using a dilution microfluidic chip. These results demonstrate the advantages of the SERS-optrode for microfluidics applications by illustrating the potential of this vibrational method to quantify components in a mixture.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Surface-enhanced Raman scattering (SERS) optrodes for multiplexed on-chip sensing of nile blue A and oxazine 720

et al. 2012

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“…A number of different approaches exist to achieve AgNPs either by grafting, embedding, and entrapped in fiber or textiles [17][18][19][20]. However, our study reports for the time, the temperature-dependent swelling property of PNIPAm has been exploited for entrapment of AgNPs into the composite.…”

Section: Preparation Of Agnps-loaded Pnipam-cf Compositementioning

confidence: 85%

Silver nanoparticles loaded thermosensitive cotton fabric for antibacterial application

Bajpai¹,

Bajpai²,

Sharma³

et al. 2013

Journal of Industrial Textiles

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Cotton fabric with improved antibacterial properties is always invited for effective use in wound dressing and healing applications. In this study, poly(N-isopropyl acrylamide) network has been produced in situ in porous cotton cellulose fabric by photo polymerization using UV-radiation. The thermoresponsiveness of the resulting fabric has been used to entrap silver nanoparticles with the fabric. The presence of silver nanoparticles in the fabric has been characterized by X-ray diffraction, transmission electron microscopy, and dynamic light scattering analysis. The fabrics have been found to possess fair mechanical properties. The individual and aggregation particle size of the silver nanoparticles was found to be in the range 13-20 nm and 140-220 nm. This aggregation phenomenon was also confirmed by dynamic light scattering measurement, i.e. 256 nm. The silver nanoparticles exhibits polydispersity index 0.18 and zeta potential À2.86 mV. The fabric exhibited fair biocidal action against Escherichia coli and Staphylococcus aureus, thus indicating its possible utility in medicinal application.

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“…11,12 Although successful in generating a SERS response, only noble metal thin films or nanoparticles can be obtained on the fiber probe by these methods, and hence the fiber probes have limited Raman sensitivity. Both theoretical and experimental studies have proved that the SERS effect greatly depends on the shape, the dimension, the size, and the composition of the metallic nanostructure.…”

mentioning

confidence: 99%

Development of Ag nanopolyhedra based fiber-optic probes for high performance SERS detection

Cao

Wang

2015

New J. Chem.

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We report on SERS probes based on silver nanopolyhedra which are integrated onto the tapered tip of an optical fiber, using a simple and effective autoclave reaction method. The SERS detection resultsshow that the tapered fiber probe has an optimal cone angle and its detection limit for 4-aminothiophenol (4-ATP) aqueous solution has reached as low as 10 À9 M.Surface-enhanced Raman scattering (SERS) is a non-destructive and powerful technique that can provide vibrational spectroscopic fingerprints from chemical and biological species. 1 The SERS effect relies on the enhancement of electromagnetic fields around metal nanostructures (typically silver and gold) to drastically increase the Raman signal of molecules in the proximity of the nanostructures. 2 Usually, the SERS spectrum is measured using an SERS substrate with noble metal nanocrystals placed on a planar platform (such as a glass slide or a silicon wafer). 2,3 Compared with the traditional SERS substrates, optical fibers provide an ideal platform for detecting the SERS signal of analytes in remote locations and for probing small samples and confined spaces, offering the ability to apply in situ chemical sensing and in vivo biosensing. 4 Moreover, they can simplify the optical alignment and enhance the SERS excitation and collection efficiencies while being relatively cheap and easily obtainable. 5 Generally, fiber SERS probes are applied to molecular detection and identification using a so-called ''optrode'' configuration, 6 in which a single optical fiber transmits both the excitation light to the sample and the backscattered SERS signal to the spectrometer; the metallic SERS-active nanostructures are fabricated directly at the end of the excitation fiber.The several approaches that have been used for preparing fiber SERS probes can be broadly divided into three categories: noble metal evaporation or sputtering, 7,8 immobilization of silver or gold colloids, 9,10 and laser-induced deposition of the noble metal. 11,12 Although successful in generating a SERS response, only noble metal thin films or nanoparticles can be obtained on the fiber probe by these methods, and hence the fiber probes have limited Raman sensitivity. Both theoretical and experimental studies have proved that the SERS effect greatly depends on the shape, the dimension, the size, and the composition of the metallic nanostructure. 3,13 As is known, the autoclave reaction method has undergone rapid progress over the past two decades and has developed as a simple and versatile route to prepare nanomaterials with controlled sizes, shapes and surface structures. 14 Inspired by its success in nanotechnology, it should be possible to extend this method to fabricate various fiber probes based on SERS-active nanostructures with the desired size and morphology to achieve high SERS sensitivities. Especially compared to the conventional approaches for the fabrication of fiber SERS probes, this method is more desirable to control nucleation and growth behaviour by varying the experimental parameters...

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SERRS fiber probe: fabrication of silver nanoparticles at the aperture of an optical fiber used for SNOM

Abstract: At the aperture of an optical fiber coupled with a SNOM SERRS-active Ag nanoparticles were selectively fabricated in a mixture of AgNO(3) and sodium citrate aqueous solution by photo-reduction due to an evanescent field.

Cited by 10 publications

References 12 publications

Surface-enhanced Raman scattering (SERS) optrodes for multiplexed on-chip sensing of nile blue A and oxazine 720

Surface-enhanced Raman scattering (SERS) optrodes for multiplexed on-chip sensing of nile blue A and oxazine 720

Silver nanoparticles loaded thermosensitive cotton fabric for antibacterial application

Development of Ag nanopolyhedra based fiber-optic probes for high performance SERS detection

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