A split-type structure of Ag nanoparticles and Al2O3@Ag@Si nanocone arrays: an ingenious strategy for SERS-based detection

Nanoscale ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 4359-4365 ◽  
Author(s):  
Zhen Wang ◽  
Chunxue Zheng ◽  
Peng Zhang ◽  
Zhulin Huang ◽  
Chuhong Zhu ◽  
...  
Keyword(s):  
Chemical Stability ◽  
Ag Nanoparticles ◽  
Hot Spots ◽  
High Density ◽  
Type Structure ◽  
Sers Substrate ◽  
Détection Signal ◽  
Ordered Array ◽  
Detection Signal

A split-type nanostructure based on an ordered array and Ag nanoparticles was fabricated as an SERS substrate with high-density SERS hot spots, which exhibited excellent detection signal reproducibility and chemical stability.

scholarly journals Preparation of a Novel SERS Platform Based on Mantis Wing with High-Density and Multi-Level “Hot Spots”

Nanomaterials ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 672
Author(s):  
Mingli Wang ◽  
Guochao Shi ◽  
Junlin Zhu ◽  
Yanying Zhu ◽  
Xin Sun ◽  
...  
Keyword(s):  
Pesticide Residues ◽  
Hot Spots ◽  
Limit Of Detection ◽  
High Density ◽  
Sers Substrate ◽  
Rapid Sampling ◽  
Relative Standard ◽  
Molecule Recognition ◽  
Multi Level ◽  
Apple Peels

The recent development of SERS substrates based on irregular nanostructures for directly molecule recognition has aroused increasing attention. By combining the irregular flake-like nanostructures of mantis wings, high SERS performance of Ag nanofilms, and the chemical stability of Au nanoparticles (NPs), an ultra-sensitive and flexible SERS substrate based on Au NPs functionalized Ag nanofilms-mantis wings (Au-Ag-M.w.) hybrid system is successfully fabricated. When 4-aminothiophenol is selected as the probe molecule, the limit of detection (LOD) is as low as 10−13 M and the relative standard deviation (RSD) is lower than 7.15%. This novel SERS platform exhibits high SERS performance in terms of sensitivity, reproducibility and practicability mainly because there are high-density and multi-level “hot spots” in the appropriate nanogaps. Meanwhile, it also systematically compares the differences of the SERS performance of Cu and Ag decorated M.w. hybrids and how these differences can alter their response. Moreover, the proposed substrate is employed to rapidly detect the pesticide residues on apple peels and the LOD for cypermethrin is estimated at 10−10 mg/mL. Therefore, this novel SERS substrate has great potential in rapid sampling of pesticide residues on real samples and expands the investigation to other natural materials for fabricating various SERS platforms.

A novel DNA biosensor for ultrasensitive detection of DNA methyltransferase activity based on a high-density “hot spots” SERS substrate and rolling circle amplification strategy

The Analyst ◽  
2021 ◽  
Author(s):  
Shengjie Ge ◽  
Menglin Ran ◽  
Yu Mao ◽  
Yue Sun ◽  
Xinyu Zhou ◽  
...  
Keyword(s):  
Hot Spots ◽  
Dna Methyltransferase ◽  
Rolling Circle Amplification ◽  
High Density ◽  
Dna Biosensor ◽  
Ultrasensitive Detection ◽  
Sers Substrate ◽  
Methyltransferase Activity ◽  
Rolling Circle ◽  
Amplification Strategy

Herein, we proposed a novel biosensor based on the high-density “hot spots” Au@SiO2 array substrate and rolling circle amplification (RCA) strategy for ultrasensitive detection of the CpG methyltransferase (M.SssI) activity....

Porous metallic nanocone arrays for high-density SERS hot spots via solvent-assisted nanoimprint lithography of block copolymer

RSC Advances ◽  
2015 ◽  
Vol 5 (93) ◽  
pp. 76085-76091 ◽  
Author(s):  
Yunha Ryu ◽  
Gumin Kang ◽  
Chang-Won Lee ◽  
Kyoungsik Kim
Keyword(s):  
Block Copolymer ◽  
Hot Spots ◽  
Nanoimprint Lithography ◽  
Selective Etching ◽  
High Density ◽  
Sers Substrate

We present a facile method of fabricating SERS substrate by combining solvent-assisted nanoimprint lithography and selective etching of block copolymer.

scholarly journals Photoacoustics for listening to Metal Nanoparticles Super-Aggregates

2021 ◽  
Author(s):  
Roberto Li Voti ◽  
Grigore Leahu ◽  
Concita Sibilia ◽  
Roberto Matassa ◽  
Giuseppe Familiari ◽  
...  
Keyword(s):  
Metal Nanoparticles ◽  
Size Distribution ◽  
Packing Density ◽  
Self Assembly ◽  
Détection Signal ◽  
Photoacoustic Detection ◽  
New Strategy ◽  
Aggregate Packing ◽  
Detection Signal

Photoacoustic detection signal has been used to build a new strategy to determine the mesoscale self-assembly of metal nanoparticles in terms of size distribution and aggregate packing density (metal nanoparticles...

scholarly journals AgNPs decorated 3D bionic silicon nanograss arrays pattern with high-density hot-spots for SERS sensing via green galvanic displacement without additives

RSC Advances ◽  
2021 ◽  
Vol 11 (44) ◽  
pp. 27152-27159
Author(s):  
Li Wang ◽  
Jian Huang ◽  
Mei-Juan Su ◽  
Jin-Di Wu ◽  
Weisheng Liu
Keyword(s):  
Hot Spots ◽  
High Density ◽  
Galvanic Displacement ◽  
Si Substrate ◽  
Plasma Interaction ◽  
Organic Reagents ◽  
Vls Growth ◽  
Sers Sensing

The Si nanograss arrays are directly grown on Si substrate via catalyst-assisted VLS growth and subsequent plasma interaction. AgNPs were rapidly immobilized on Si nanograss arrays for SERS sensing, without any organic reagents and additives.

Experimental Study of the Influencing Factors of Elevator Cable Magnetic Flux Leakage Detection Signal

2013 ◽  
Vol 711 ◽  
pp. 327-332
Author(s):  
Yi Su ◽  
Zhen Zhang ◽  
Tao Zhang ◽  
Ming Li Yang ◽  
Mei Lin ◽  
...  
Keyword(s):  
Magnetic Flux ◽  
Magnetic Flux Leakage ◽  
Probe Design ◽  
Détection Signal ◽  
Detection Mechanism ◽  
Fracture Width ◽  
Lift Off ◽  
Elevator Cable ◽  
Flux Leakage ◽  
Detection Signal

The detection mechanism of Magnetic Flux Leakage (MFL) Method of elevator cable is proposed. Using Gauss-Mercury method to analyze the influence of different factors that lift-off value, fracture width, broken wires number and diameter and depth all that based on the collecting experimental system of MFL signals. The method can be used to optimize the detection probe design and detection signal processing.

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