Monomer functionalized silica coated with Ag nanoparticles for enhanced SERS hotspots

Newmai, M. Boazbou; Verma, Manoj; Kumar, Pradeep

doi:10.1016/j.apsusc.2018.01.007

Cited by 19 publications

(7 citation statements)

References 65 publications

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“…In recent years, environmental pollution and pesticide residues in food have become notable problems. SERS has attracted increasing attention as a method for analyzing a variety of environmental and food samples. − One of the most critical challenges for improving the analytical performance of SERS is the development of a low-cost, high-throughput screening method to fabricate precious metal nanostructure substrates with a wide range and reproducible Raman enhancement effects. Here, SPHS CC structures could have three key advantages as SERS substrates.…”

Section: Resultsmentioning

confidence: 99%

Iridescent Colloidal Crystals Composed of SiO₂ Porous Hollow Sphere for SERS Application

et al. 2022

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In recent years, the application of low-refractiveindex materials in the optical field has attracted considerable attention due to it high transmittance and high optical sensitivity. In this study, we synthesized SiO 2 porous hollow spheres (SPHS) with an ultralow refractive index (n = 1.05) by using a templating method. Their refractive indices could be easily controlled from 1.05 to 1.08 by tuning the thickness of shell. In addition, a droplet coatings method is proposed for SPHS colloidal crystal (CC) by controlling the temperature and humidity. The SPHS CCs displayed distinct structural colors when the incident angle was adjusted and demonstrated high angular resolution. Moreover, the iridescent color changes could be observed with the naked eye. For surface-enhanced Raman scattering application, more analyte could be absorbed by the porous shells, and metal nanoparticles were coated on the SPHSs surface to increase the hot spot density for improving the SERS intensity.

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Section: Resultsmentioning

confidence: 99%

Iridescent Colloidal Crystals Composed of SiO₂ Porous Hollow Sphere for SERS Application

et al. 2022

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“…If it is detected that there is a synchronization network in the system, the synchronization client executes the restart service and directly joins the synchronization network in the system. After synchronization, the interaction of a certain number of integrated frames enters a stable synchronization state, and the number of interactions can be configured offline according to actual needs [10][11].…”

Section: Time Synchronization Processmentioning

confidence: 99%

Time Synchronization Method of Distributed System Considering Local Area Network

2020

DPS

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With the rapid development of society, whether it is a military control system or a civilian control system, various distributed systems have put forward higher and higher requirements for the real-time interaction of control information among various devices in the system. The purpose of this paper is to consider the research on the time synchronization method of the distributed system of the local area network, and study the extended Kalman filtering method based on the prior coordinate constraints to improve the PPP time transfer performance; for the PPP timing calculation, the ambiguity fixed reliability requirements are higher than the positioning calculation. According to the actual situation, the ambiguity fixing method based on the integer phase clock method is studied, and the ambiguity fixing and quality control strategy suitable for timing calculation is proposed. Quality control at each stage. Based on the average standard deviation results, this paper continues to calculate the average root mean square error of the above phase difference data in different smoothing times, and evaluates the synchronization accuracy of the terminal in different durations. The root mean square errors of scheme two in the duration of 60min, 120min and 180min are 0.13, 0.15, and 0.2ns, respectively, and the root mean square errors of scheme three in the same duration are 0.12, 0.14, and 0.18ns, respectively.

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“…33−37 Furthermore, SiO 2 can be easily surface-functionalized by organosilanes, including polydiallylodimethyl ammonium chloride, 38 3-mercaptopropyltrimethoxysilane, 39,40 3-aminopropyl trimethoxysilane, 41 polyethyleneimine, and other organic compounds such as dopamine 42 and vinylpyrrolidone. 43 The as-grafted functional groups on the silica surface can create clinical sites for the attachment and growth of Ag nanoparticles through the terminal groups, 44 which could contribute to enhancing SERS. Le Beulze et al decorated Ag nanoparticles (diameter > 10 nm) onto SiO 2 microspheres surface-functionalized with organosilanes and positively charged polymers to obtain a raspberry-like SiO 2 @ Ag nanostructure that can function as a new type of SERS substrate for the detection of analytical targets.…”

Section: Introductionmentioning

confidence: 99%

“…In terms of the study or application of SERS with noble nanoparticles, spherical silica could be an excellent core or support, mainly because of its remarkable features such as monodispersibility, high optical transparency and thermal stability, good biocompatibility, and simple synthesis by the standard Stöber method. − Furthermore, SiO 2 can be easily surface-functionalized by organosilanes, including polydiallylodimethyl ammonium chloride, 3-mercaptopropyltrimethoxysilane, , 3-aminopropyl trimethoxysilane, polyethyleneimine, and other organic compounds such as dopamine and vinylpyrrolidone . The as-grafted functional groups on the silica surface can create clinical sites for the attachment and growth of Ag nanoparticles through the terminal groups, which could contribute to enhancing SERS.…”

Section: Introductionmentioning

confidence: 99%

Silver Nanoparticle-Decorated Silica Nanospheres and Arrays as Potential Substrates for Surface-Enhanced Raman Scattering

Tian

et al. 2021

ACS Omega

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Poly(vinylpyrrolidone) (PVP) was used as both a modifier and reductant to in situ deposit silver nanoparticles (denoted Ag NPs) on the surface of silica nanospheres (nanosilica or nano-SiO2), affording Ag-decorated nanosilica (denoted SiO2@Ag). The as-obtained SiO2@Ag composite can form silver nanoparticle-decorated silica nanosphere arrays (denoted SiO2@Ag arrays) via evaporation-induced self-assembly. The as-prepared SiO2@Ag composite and SiO2@Ag array were used as the SERS substrates to measure the Raman signals of the dilute solutions of rhodamine 6G (denoted R6G), an organic dye that is a potential pollutant to the environment. The findings indicate that the as-prepared SiO2@Ag composite and SiO2@Ag array as potential SERS substrates simultaneously exhibit a high degree of metal coverage and small size of Ag NPs as well as good stability and abundant “hot spots”, which contributes to their desired Raman enhancement capacities. For the detection of trace R6G, they provide a limit of detection of as low as 10–9–10–11 M as well as good reproducibility, showing promising potential for monitoring chemical and biological molecules.

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Monomer functionalized silica coated with Ag nanoparticles for enhanced SERS hotspots

Cited by 19 publications

References 65 publications

Iridescent Colloidal Crystals Composed of SiO₂ Porous Hollow Sphere for SERS Application

Iridescent Colloidal Crystals Composed of SiO₂ Porous Hollow Sphere for SERS Application

Time Synchronization Method of Distributed System Considering Local Area Network

Silver Nanoparticle-Decorated Silica Nanospheres and Arrays as Potential Substrates for Surface-Enhanced Raman Scattering

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Monomer functionalized silica coated with Ag nanoparticles for enhanced SERS hotspots

Cited by 19 publications

References 65 publications

Iridescent Colloidal Crystals Composed of SiO2 Porous Hollow Sphere for SERS Application

Iridescent Colloidal Crystals Composed of SiO2 Porous Hollow Sphere for SERS Application

Time Synchronization Method of Distributed System Considering Local Area Network

Silver Nanoparticle-Decorated Silica Nanospheres and Arrays as Potential Substrates for Surface-Enhanced Raman Scattering

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Iridescent Colloidal Crystals Composed of SiO₂ Porous Hollow Sphere for SERS Application

Iridescent Colloidal Crystals Composed of SiO₂ Porous Hollow Sphere for SERS Application