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  • 1
    Online Resource
    Online Resource
    Quasi‐3D‐Structured Surface‐Enhanced Raman Scattering Substrates Based on Silver Nanoparticles/Mesoporous Silicon Hybrid
    Wiley ; 2022
    In:  physica status solidi (a) Vol. 219, No. 18 ( 2022-09)
    Details
    In: physica status solidi (a), Wiley, Vol. 219, No. 18 ( 2022-09)
    Abstract: The surface‐enhanced Raman scattering (SERS) is a powerful spectroscopic technique for ultrasensitive and selective biochemical detection due to its capability of providing the “fingerprint” of information of molecular structures at low concentrations. Herein, mesoporous silicon (MPSi)‐based nanocomposites containing silver nanoparticles (AgNPs) provide novel efficient substrates for the detection of molecules. The quasi‐3D‐structured SERS substrate is formed by introducing Ag into the MPSi hollow column‐shaped nanostructure. This SERS substrate uniquely combines the ability of metal surfaces to amplify Raman scattering signals with an enlarged surface area and the increasing light–matter interaction duration that generates large SERS signals for the detection of chemicals. The proposed SERS substrate is verified by detecting orange methylene in solutions at ultralow concentration in the range of 10 −11 –10 −6   m with a linear‐dependent coefficient of R 2  = 0.99922 and the SERS enhancement factor is achieved up to 10 10 . Moreover, the proposed platform can detect diphenylamine with ultralow concentration of 10 −10  m and reliable reproducibility with an average relative stand deviation of 6.3%. The ability for MPSi substrate to detect target molecules at low concentrations helps pave a way to develop the detection tool for integrated, on‐chip devices.
    Type of Medium: Online Resource
    ISSN: 1862-6300 , 1862-6319
    URL: Issue
    URL: Article
    DOI: 10.1002/pssa.v219.18
    DOI: 10.1002/pssa.202200128
    Language: English
    Publisher: Wiley
    Publication Date: 2022
    detail.hit.zdb_id: 1481091-8
    detail.hit.zdb_id: 208850-2
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  • 2
    Online Resource
    Online Resource
    Detection of Permethrin pesticide using silver nano-dendrites SERS on optical fibre fabricated by laser-assisted photochemical method
    Springer Science and Business Media LLC ; 2019
    In:  Scientific Reports Vol. 9, No. 1 ( 2019-08-29)
    Details
    In: Scientific Reports, Springer Science and Business Media LLC, Vol. 9, No. 1 ( 2019-08-29)
    Abstract: Permethrin, 3-Phenoxybenzyl (1 RS)-cis,trans-3-(2,2-dichlorovinyl)- 2,2-dimethylcyclopropanecarboxylate, has a wide range of applications like insecticide, insect repellent and prevents mosquito-borne diseases, such as dengue fever and malaria in tropical areas. In this work, we develop a prominent monitoring method for the detection of permethrin pesticide using surface-enhanced Raman scattering (SERS) optical fibre substrates. The novel SERS-active optical fibre substrates were grown and deposited silver (Ag) nano-dendrites on the end of multi-mode fibre core by laser-assisted photochemical method. The characteristic of the Ag-nanostructures could be controlled by the experimental conditions, namely, laser illumination time. Ag nanoparticles optical fibre substrates and Ag nano-dendrites optical fibre substrates were prepared with laser illumination time of 3 min and 8 min, respectively. The achieved SERS-activity optical fibre substrates were tested with Rhodamine 6G aqueous solutions. We demonstrate that the SERS activity coupled with Ag nano-dendrites optical fibre substrate has higher Raman enhancement factor due to the creation of many of hot-spots for amplifying Raman signals. Besides, the stability and reproducibility of the Ag nano-dendrites optical fibre substrate were also evaluated with stored time of 1000 hours and relative standard deviation of less than 3%. The Ag nano-dendrite optical fibre substrate was selected for detection of permethrin pesticide in the concentration range of 0.1 ppm–20 ppm with limit of quantification (LOQ) of 0.1 ppm and calculated limit of detection (LOD) of 0.0035 ppm, proving its great potential for direct, rapid detection and monitoring of permethrin.
    Type of Medium: Online Resource
    ISSN: 2045-2322
    URL: Article
    DOI: 10.1038/s41598-019-49077-1
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2019
    detail.hit.zdb_id: 2615211-3
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  • 3
    Online Resource
    Online Resource
    Hybrid Integrated Nanophotonic Silicon-based Structures
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2019
    In:  Communications in Physics Vol. 29, No. 4 ( 2019-12-16), p. 481-
    Details
    In: Communications in Physics, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 29, No. 4 ( 2019-12-16), p. 481-
    Abstract: We report nanophotonic silicon-based devices for hybrid integration: 1D photonic crystal (PhC) on optical fiber, i. e. fiber Bragg grating (FBG) sensing probe integrated in fiber laser structure for chemical sensors and slotted planar 2D PhC cavity combined with carbon nanotube (CNT) towards light nanosources. The experiments have been carried out by integrating 1D PhC on optical fiber in fiber laser structure. This structure possesses many advantages including high resolution for wavelength shift, high optical signal-to-noise ratio (OSNR) of about 50~dB, the small full width at half-maximum (FWHM) of about 0.014~nm therefore its accuracy is enhanced, as well as the precision and capability are achieved for remote sensing. Low nitrate concentration in water from 0 to 80 ppm has been used to demonstrate its sensing ability in the experiment. The proposed sensor can work with good repeatability, rapid response, and its sensitivity can be obtained of \(3.2\times 10^{ - 3}\) nm/ppm with the limit of detection (LOD) of 3~ppm. For 2D PhC cavity, enhancement of photoluminescence of CNT emission is observed. The semiconducting single-walled carbon nanotubes (s-SWNTs) solution was prepared by polymer-sorted method and coupled with the confined modes in silicon slotted PhC cavities. The enhancement ratio of 1.15 is obtained by comparing between the PL peaks at two confined modes of the cavity. The PL enhancement result of the integrated system shows the potential for the realization of on-chip nanoscale sources.
    Type of Medium: Online Resource
    ISSN: 0868-3166 , 0868-3166
    URL: Issue
    URL: Article
    DOI: 10.15625/0868-3166-29-4
    DOI: 10.15625/0868-3166/29/4/13855
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2019
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  • 4
    Online Resource
    Online Resource
    Detection of Ultra-Low Concentration of Methylene Blue by Porous Silicon Photonic Crystals Covered With Siver Nanoparticles as Efficient Sers Substrate
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2021
    In:  Communications in Physics Vol. 31, No. 4 ( 2021-09-29)
    Details
    In: Communications in Physics, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 31, No. 4 ( 2021-09-29)
    Abstract:  In this work, porous silicon photonic crystals (PSi PhCs) covered by silver nanoparticles (AgNPs) were prepared as surface-enhanced Raman scattering (SERS) substrate to detect methylene blue (MB) at low concentrations. The limit of MB detection in water by the SERS substrate is evaluated to be 10\(^{-10}\) mol/L. The SERS signal intensities of 446 cm\(^{-1}\) and 1623 cm\(^{-1}\) peaks in SERS spectra of MB are fit in exponential functions of concentrations ranging from 10\(^{-4}\) to 10\(^{-10}\) mol/L. These results show that the AgNPs on PSi PhCs substrates could be applied in environmental sensing.
    Type of Medium: Online Resource
    ISSN: 0868-3166 , 0868-3166
    URL: Article
    DOI: 10.15625/0868-3166/15927
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2021
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  • 5
    Online Resource
    Online Resource
    Silicon slotted photonic crystal cavities fabricated by deep-ultraviolet lithography
    Optica Publishing Group ; 2021
    In:  Journal of the Optical Society of America B Vol. 38, No. 10 ( 2021-10-01), p. 2898-
    Details
    In: Journal of the Optical Society of America B, Optica Publishing Group, Vol. 38, No. 10 ( 2021-10-01), p. 2898-
    Abstract: Slotted photonic crystal (SPC) cavities provide strong evanescent fields, high quality factors, and small mode volumes. Hence, SPC cavities have been identified as promising candidates for the implementation of high-performance sensors and the development of hybrid devices combining silicon with other active materials. Nevertheless, most state-of-the-art demonstrations rely on electron beam lithography and operate in the telecommunications band near the 1550 nm wavelength. Here, we report the experimental demonstration of SPC cavities operating in the datacom O-band, near 1340 nm wavelength, fabricated using deep-ultraviolet (DUV) lithography. The O-band provides very interesting properties for sensing, communications, and hybrid integration: namely, lower optical absorption of water, lower dispersion in standard optical fibers, and the emission of active materials like carbon nanotubes. On the other hand, DUV fabrication opens interesting opportunities for large volume production. The proposed cavities exhibit a high quality factor exceeding 20,000 and a small mode volume of 0.023 ( λ / n ) 3 . These results open interesting perspectives to exploit enhanced light–matter interaction in SPC cavities harnessing industrial-like fabrication processes.
    Type of Medium: Online Resource
    ISSN: 0740-3224 , 1520-8540
    URL: Article
    DOI: 10.1364/JOSAB.430455
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2021
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  • 6
    Online Resource
    Online Resource
    Improvement of SERS for detection of ultra-low concentration of methyl orange by nanostructured silicon decorated with Ag nanoparticles
    Elsevier BV ; 2021
    In:  Optik Vol. 231 ( 2021-04), p. 166431-
    Details
    In: Optik, Elsevier BV, Vol. 231 ( 2021-04), p. 166431-
    Type of Medium: Online Resource
    ISSN: 0030-4026
    URL: Article
    DOI: 10.1016/j.ijleo.2021.166431
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2021
    detail.hit.zdb_id: 2040037-8
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  • 7
    Online Resource
    Online Resource
    Determination of low solvent concentration by nano-porous silicon photonic sensors using volatile organic compound method
    Informa UK Limited ; 2019
    In:  Environmental Technology Vol. 40, No. 26 ( 2019-11-23), p. 3403-3411
    Details
    In: Environmental Technology, Informa UK Limited, Vol. 40, No. 26 ( 2019-11-23), p. 3403-3411
    Type of Medium: Online Resource
    ISSN: 0959-3330 , 1479-487X
    URL: Article
    DOI: 10.1080/09593330.2018.1474268
    Language: English
    Publisher: Informa UK Limited
    Publication Date: 2019
    detail.hit.zdb_id: 2188059-1
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  • 8
    Online Resource
    Online Resource
    Fabrication of Silver Nano-Dendrites on Optical Fibre Core by Laser-Induced Method for Surface-Enhanced Raman Scattering Applications
    American Scientific Publishers ; 2020
    In:  Journal of Nanoscience and Nanotechnology Vol. 20, No. 3 ( 2020-03-01), p. 1928-1935
    Details
    In: Journal of Nanoscience and Nanotechnology, American Scientific Publishers, Vol. 20, No. 3 ( 2020-03-01), p. 1928-1935
    Abstract: In this work, we present a novel fabrication method for making the surface-enhanced Raman scattering (SERS) probe based on silver (Ag) nano-dendrites which are grown and deposited on the end of multi-mode fibre core by a simple and low-cost laser-induced technique. The morphology of the Ag-nanoparticles (AgNPs) could be controlled by the experimental conditions such as laser power, illumination time, and concentration of the reaction solution. The morphology and chemical composition of SERS fibre probes are characterized by high-resolution scanning electron microscope (HR-SEM) and Energy dispersive X-ray spectroscopy (EDX), respectively. These results confirmed how the Ag nanostructures morphology is modified as a function of illumination time of laser irradiation, and the growth and deposition of Ag nanostructures occur only in the main laser-irradiated part on the end of multi-mode fibre core. The achieved SERS-activity substrates on the fibre probes are testing with the detection of low concentration of Rhodamine 6G aqueous solutions in the range of 10 -5 –10 -10 M. This study shows that SERS activity coupled with Ag nano-dendrites substrate on the fibre probe has the best enhancement factor of 1.93×10 7 for Rhodamine 6G due to the creation of many of hot-spots for amplifying Raman signals by Ag nano-dendrite structures, which is a promising candidate with low-cost SERS probe of chemical compact optical fibre sensors for direct, rapid, real-time and non-destructive detection of chemical compounds in liquid environment.
    Type of Medium: Online Resource
    ISSN: 1533-4880
    URL: Article
    DOI: 10.1166/jnn.2020.17136
    Language: English
    Publisher: American Scientific Publishers
    Publication Date: 2020
    SSG: 11
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  • 9
    Online Resource
    Online Resource
    High enhancement factor of SERS probe based on silver nano-structures deposited on a silica microsphere by laser-assisted photochemical method
    IOP Publishing ; 2021
    In:  Measurement Science and Technology Vol. 32, No. 2 ( 2021-02-01), p. 025109-
    Details
    In: Measurement Science and Technology, IOP Publishing, Vol. 32, No. 2 ( 2021-02-01), p. 025109-
    Abstract: The high enhancement factor (EF) of surface-enhanced Raman (SERS) probes is an important parameter for high-sensitivity Raman scattering measurement applied to environment control. In this article, we present a SERS probe based on silver nano-structures deposited on silica microsphere surfaces made by the laser-assisted photochemical method and reflection converging mirror for a high EF Raman measurement of ultralow organic compound concentration inliquid environments. The laser-assisted photochemical method can synthesize and homogeneously deposit nano-silvers on a silica microsphere, and the reflection converging mirror can collect more Raman signal to the photo-detector and give high Raman enhancement of the SERS probe. The SERS-activity of the probe is verified by the detection of ultralow concentrations of Rhodamine 6 G in aqueous solutions in the range of 10 −4 –10 −10 M. The obtained results show that the proposed SERS probe has an increase of collected Raman intensity up to 32% in comparison to a SERS probe without reflection converging mirror, and an EF of the SERS probe achieved up to 1.8 × 10 10 . We believe that the novel SERS probe has a large potential for applications in biochemical sensing techniques.
    Type of Medium: Online Resource
    ISSN: 0957-0233 , 1361-6501
    URL: Article
    DOI: 10.1088/1361-6501/abab20
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 1362523-8
    detail.hit.zdb_id: 1011901-2
    SSG: 11
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  • 10
    Online Resource
    Online Resource
    Highly-sensitive Refractometer Based on a D-shaped Fiber Bragg Grating Integrated into A Loop-mirror Optical Fiber Laser
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2021
    In:  Communications in Physics Vol. 32, No. 1 ( 2021-09-30), p. 11-
    Details
    In: Communications in Physics, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 32, No. 1 ( 2021-09-30), p. 11-
    Abstract: In this paper, we report a new type of refractometer based on a D-shaped fiber Bragg grating (FBG) integrated in a loop-mirror optical fiber laser. This proposed sensor is used in wavelength interrogation method, in which the D-shaped FBG is applied as a refractive index (RI) sensing probe and a mirror to select mode of laser. The D-shaped FBG is prepared by the removal of a portion of the fiber cladding covering the FBG by means of side-polishing technique. The D-shaped FBG sensing probe integrated in a loop-mirror optical fiber laser with saturated pump technique, the characteristics of sensing signals have been improved to obtain stable intensity, narrower bandwidth and higher optical signal-to-noise ratio compare to normal reflection configuration. The limit of detection (LOD) of this sensor can be achieved to 2.95 x 10-4 RIU in the refractive index (RI) range of 1.42-1.44. Accordingly, we believe that the proposed refractometer has a huge potential for applications in biochemical-sensing technique.
    Type of Medium: Online Resource
    ISSN: 0868-3166 , 0868-3166
    URL: Article
    DOI: 10.15625/0868-3166/16014
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2021
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