Metallo-Dielectric Colloidal Films as SERS Substrate

Self-assembly of Pd@Au core/shell nanosheets used as a highly sensitive SERS substrate based on the determination of trace fluorescent dye

International Journal of Materials Research (formerly Zeitschrift fuer Metallkunde) ◽

10.3139/146.111768 ◽

2019 ◽

Vol 110 (6) ◽

pp. 563-569

Author(s):

Tran Thi Bich Quyen ◽

Huynh Thanh Hien ◽

Truong Khai Hoan ◽

Bui Le Anh Tuan ◽

Nguyen Thi Tho

Keyword(s):

Self Assembly ◽

Fluorescent Dye ◽

Core Shell ◽

Sers Substrate ◽

Highly Sensitive

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Tuning the Localized Surface Plasmon Resonance of Al-Al2O3 Nanosphere Towards NIR Region by Gold Coating

Micro and Nanosystems ◽

10.2174/1876402912999200727173140 ◽

2020 ◽

Vol 12 ◽

Author(s):

Jyoti Katyal ◽

Shivani Gautam

Keyword(s):

Electric Field ◽

Field Distribution ◽

Dielectric Layer ◽

Electric Field Distribution ◽

Active Material ◽

Visible Region ◽

Field Enhancement ◽

Localized Surface Plasmon ◽

Sers Substrate ◽

Al Nanoparticles

Background: A relatively narrow LSPR peak and a strong inter band transition ranging around 800 nm makes Al strongly plasmonic active material. Usually, Al nanoparticles are preferred for UV-plasmonic as the SPR of small size Al nanoparticles locates in deep UV-UV region of the optical spectrum. This paper focused on tuning the LSPR of Al nanostructure towards infrared region by coating Au layer. The proposed structure has Au as outer layer which prevent the further oxidation of Al nanostructure. Methods: The Finite Difference Time Domain (FDTD) and Plasmon Hybridization Theory has been used to evaluated the LSPR and field enhancement of single and dimer Al-Al2O3-Au MDM nanostructure. Results: It is observed that the resonance mode show dependence on the thickness of Al2O3 layer and also on the composition of nanostructure. The Au layered MDM nanostructure shows two peak of equal intensities simultaneously in UV and visible region tuned to NIR region. The extinction spectra and electric field distribution profiles of dimer nanoparticles are compared with monomer to reveal the extent of coupling. The dimer configuration shows higher field enhancement ~107 at 1049 nm. By optimizing the thickness of dielectric layer the MDM nanostructure can be used over UV-visible-NIR region. Conclusion: The LSPR peak shows dependence on the thickness of dielectric layer and also on the composition of nanostructure. It has been observed that optimization of size and thickness of dielectric layer can provide two peaks of equal intensities in UV and Visible region which is advantageous for many applications. The electric field distribution profiles of dimer MDM nanostructure enhanced the field by ~107 in visible and NIR region shows its potential towards SERS substrate. The results of this study will provide valuable information for the optimization of LSPR of Al-Al2O3-Au MDM nanostructure to have high field enhancement.

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The high active SERs substrate prepared by self assembling Ag nanoparticles on PPy@PEDOT:PSS film to detect the sodium formaldehyde sulfoxylate molecules

Optical Materials ◽

10.1016/j.optmat.2021.110955 ◽

2021 ◽

Vol 114 ◽

pp. 110955

Author(s):

Xueqin Wang ◽

Jinguo Jiang ◽

Qingqing Zhang ◽

Zhongchen Bai

Keyword(s):

Ag Nanoparticles ◽

Sers Substrate ◽

Self Assembling

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Facile synthesis of Ag@C@Ag hybrid nanoparticles as SERS substrate

Analytical and Bioanalytical Chemistry ◽

10.1007/s00216-021-03551-w ◽

2021 ◽

Author(s):

Xiaoli Xin ◽

Yi Li ◽

Lu Yu ◽

Weihua Li ◽

Jiansheng Li ◽

...

Keyword(s):

Hybrid Nanoparticles ◽

Sers Substrate ◽

Facile Synthesis

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Synthesis of Densely Immobilized Gold-Assembled Silica Nanostructures

International Journal of Molecular Sciences ◽

10.3390/ijms22052543 ◽

2021 ◽

Vol 22 (5) ◽

pp. 2543

Author(s):

Bomi Seong ◽

Sungje Bock ◽

Eunil Hahm ◽

Kim-Hung Huynh ◽

Jaehi Kim ◽

...

Keyword(s):

Potential Method ◽

Sers Substrate ◽

Chloroauric Acid ◽

Au Nps ◽

Sio2 Surface ◽

Color Changes ◽

Surface Enhanced Raman ◽

Nanoparticle Preparation ◽

Enhanced Raman Scattering ◽

20 Nm

In this study, dense gold-assembled SiO2 nanostructure (SiO2@Au) was successfully developed using the Au seed-mediated growth. First, SiO2 (150 nm) was prepared, modified by amino groups, and incubated by gold nanoparticles (ca. 3 nm Au metal nanoparticles (NPs)) to immobilize Au NPs to SiO2 surface. Then, Au NPs were grown on the prepared SiO2@Au seed by reducing chloroauric acid (HAuCl4) by ascorbic acid (AA) in the presence of polyvinylpyrrolidone (PVP). The presence of bigger (ca. 20 nm) Au NPs on the SiO2 surface was confirmed by transmittance electronic microscopy (TEM) images, color changes to dark blue, and UV-vis spectra broadening in the range of 450 to 750 nm. The SiO2@Au nanostructure showed several advantages compared to the hydrofluoric acid (HF)-treated SiO2@Au, such as easy separation, surface modification stability by 11-mercaptopundecanoic acid (R-COOH), 11-mercapto-1-undecanol (R-OH), and 1-undecanethiol (R-CH3), and a better peroxidase-like catalysis activity for 5,5′-Tetramethylbenzidine (TMB) and hydrogen peroxide (H2O2) reaction. The catalytic activity of SiO2@Au was two times better than that of HF-treated SiO2@Au. When SiO2@Au nanostructure was used as a surface enhanced Raman scattering (SERS) substrate, the signal of 4-aminophenol (4-ATP) on the surface of SiO2@Au was also stronger than that of HF-treated SiO2@Au. This study provides a potential method for nanoparticle preparation which can be replaced for Au NPs in further research and development.

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Fabrication of plasmonic cotton gauze-Ag composite as versatile SERS substrate for detection of pesticides residue

Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy ◽

10.1016/j.saa.2021.119766 ◽

2021 ◽

pp. 119766

Author(s):

Xiaoran Tian ◽

Peng Zhai ◽

Jiaqi Guo ◽

Qian Yu ◽

Lingzi Xu ◽

...

Keyword(s):

Sers Substrate ◽

Cotton Gauze ◽

Pesticides Residue

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Magnetic Assembly Route to Construct Reproducible and Recyclable SERS Substrate

Nanoscale Research Letters ◽

10.1186/s11671-019-3184-7 ◽

2019 ◽

Vol 14 (1) ◽

Author(s):

Bingfang Zou ◽

Chunyu Niu ◽

Ming Ma ◽

Lu Zhao ◽

Yongqiang Wang

Keyword(s):

Noble Metal ◽

Reaction System ◽

Practical Interest ◽

Building Blocks ◽

Detection Sensitivity ◽

Sers Substrate ◽

Magnetic Assembly ◽

Surface Enhanced Raman ◽

Signal Sensitivity ◽

Uniform Array

AbstractThe fabrication of a uniform array film through assembly of colloidal building blocks is of practical interest for the integrated individual and collective functions. Here, a magnetic assembly route was put forward to organize monodisperse noble metal microspheres into a uniform array film for surface-enhanced Raman scattering (SERS) application, which demonstrated the integrated signal sensitivity of single noble metal microspheres and reproducibility of their assembled uniform array film. For this purpose, monodisperse multifunctional Fe3O4@SiO2@TiO2@Ag (FOSTA) colloidal microspheres as building blocks were successfully synthesized through a homemade ultrasonic-assisted reaction system. When used in SERS test, these multifunctional microspheres could firstly bind the analyte (R6G) from solution and then assembled into a uniform film under an external magnetic field, which exhibited high SERS detection sensitivity with good reproducibility. In addition, due to the TiO2 interlayer in FOSTA colloidal microspheres, the building blocks could be recycled and self cleaned through photocatalytic degradation of the adsorbed analyte for recycling SERS application.

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Silicon Microchannel-Driven Raman Scattering Enhancement to Improve Gold Nanorod Functions as a SERS Substrate toward Single-Molecule Detection

ACS Applied Materials & Interfaces ◽

10.1021/acsami.1c08480 ◽

2021 ◽

Author(s):

Jaciara Bär ◽

Anerise de Barros ◽

Davi H. S. de Camargo ◽

Mariane P. Pereira ◽

Leandro Merces ◽

...

Keyword(s):

Raman Scattering ◽

Single Molecule ◽

Gold Nanorod ◽

Single Molecule Detection ◽

Sers Substrate

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Fabrication and Application of SERS-Active Cellulose Fibers Regenerated from Waste Resource

Polymers ◽

10.3390/polym13132142 ◽

2021 ◽

Vol 13 (13) ◽

pp. 2142

Author(s):

Shengjun Wang ◽

Jiaqi Guo ◽

Yibo Ma ◽

Alan X. Wang ◽

Xianming Kong ◽

...

Keyword(s):

Au Nanoparticles ◽

Cellulose Fiber ◽

Cellulose Fibers ◽

Regenerated Cellulose ◽

Sers Substrate ◽

Au Nps ◽

Convenient Approach ◽

Theoretical Simulations ◽

Difference Time ◽

Raman Probe

The flexible SERS substrate were prepared base on regenerated cellulose fibers, in which the Au nanoparticles were controllably assembled on fiber through electrostatic interaction. The cellulose fiber was regenerated from waste paper through the dry-jet wet spinning method, an eco-friendly and convenient approach by using ionic liquid. The Au NPs could be controllably distributed on the surface of fiber by adjusting the conditions during the process of assembling. Finite-difference time-domain theoretical simulations verified the intense local electromagnetic fields of plasmonic composites. The flexible SERS fibers show excellent SERS sensitivity and adsorption capability. A typical Raman probe molecule, 4-Mercaptobenzoicacid (4-MBA), was used to verify the SERS cellulose fibers, the sensitivity could achieve to 10−9 M. The flexible SERS fibers were successfully used for identifying dimetridazole (DMZ) from aqueous solution. Furthermore, the flexible SERS fibers were used for detecting DMZ from the surface of fish by simply swabbing process. It is clear that the fabricated plasmonic composite can be applied for the identifying toxins and chemicals.

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