Fabrication of SERS substrates containing dense “hot spots” by assembling star-shaped nanoparticles on superhydrophobic surfaces

2017 ◽  
Vol 41 (12) ◽  
pp. 5028-5033 ◽  
Author(s):  
Lianqiao Tan ◽  
Chang Liu ◽  
Ying Wang ◽  
Jie Sun ◽  
Jian Dong ◽  
...  
Keyword(s):  
Hot Spots ◽  
Superhydrophobic Surfaces ◽  
Sers Substrates ◽  
Shaped Nanoparticles ◽  
Assembly Technique

In this work, efficient SERS substrates containing dense hot spots were fabricated by assembling AuNS@Ag on SMCSL superhydrophobic platforms, based on an evaporation assembly technique.

Stable and Recyclable SERS Substrates Based on Au-Loaded PET Nanocomposite Superhydrophobic Surfaces

NANO ◽  
2018 ◽  
Vol 13 (05) ◽  
pp. 1850053 ◽  
Author(s):  
Hua-Xiang Chen ◽  
Yu-Ting Wang ◽  
Ting-Ting You ◽  
Jin Zhai ◽  
Peng-Gang Yin
Keyword(s):  
Hot Spots ◽  
Physical Vapor Deposition ◽  
Deposition Process ◽  
Superhydrophobic Surfaces ◽  
Sers Substrates ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Sers Detection ◽  
Enhanced Raman Scattering ◽  
Target Molecules

Novel surface-enhanced Raman scattering (SERS) substrates with stable and recyclable properties have been prepared by assembling gold nanoparticles-loaded PET (AuNPs/PET) nanocomposite superhydrophobic surfaces. After a physical vapor deposition process, the AuNPs/PET surfaces with vast plasmonic “hot spots” showed superhydrophobic properties, and it can hold target molecules droplets for rapid SERS detection. From blown off droplets and rinsed substrates with water after detection, we found that no probe molecules remained on the surfaces from Raman spectra. The prepared substrates were not contaminated in the detection process. Furthermore, the new SERS substrates were used for rapidly detecting droplets of crystal violet (CV) and the lowest detection concentration was about [Formula: see text] M. The as-prepared AuNPs/PET substrates also have good performance in terms of reproducibility and recyclability.

Binary “island” shaped arrays with high-density hot spots for surface-enhanced Raman scattering substrates

Nanoscale ◽  
2018 ◽  
Vol 10 (29) ◽  
pp. 14220-14229 ◽  
Author(s):  
Weidong Zhao ◽  
Shuyuan Xiao ◽  
Yuxian Zhang ◽  
Dong Pan ◽  
Jiahui Wen ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Hot Spots ◽  
Surface Enhanced Raman Scattering ◽  
High Density ◽  
Self Assembled Monolayer ◽  
Sers Substrates ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Self Assembled

The BISA with high-density hot spots as reproducible SERS substrates by combining an opal structure with self-assembled monolayer AuNPs is demonstrated.

Zinc oxide/silver nanoarrays as reusable SERS substrates with controllable ‘hot-spots’ for highly reproducible molecular sensing

2014 ◽  
Vol 436 ◽  
pp. 251-257 ◽  
Author(s):  
Ahmad Esmaielzadeh Kandjani ◽  
Mahsa Mohammadtaheri ◽  
Akshi Thakkar ◽  
Suresh Kumar Bhargava ◽  
Vipul Bansal
Keyword(s):  
Zinc Oxide ◽  
Hot Spots ◽  
Molecular Sensing ◽  
Sers Substrates

Fabrication of SERS Active Substrates by Nanoimprint Lithography

2007 ◽  
Vol 1054 ◽  
Author(s):  
Kebin Li ◽  
Bo Cui ◽  
Liviu Clime ◽  
Teodor Veres
Keyword(s):  
Numerical Simulations ◽  
Hot Spots ◽  
Nanoimprint Lithography ◽  
Rhodamine 6G ◽  
Low Cost ◽  
Dipole Approximation ◽  
Sers Substrates ◽  
The Given ◽  
Method Show ◽  
Dda Method

ABSTRACTA method for low-cost fabrication of SERS substrates in rapid and reproducible way based on nanoimprint lithography (NIL) method has been developed. The SERS enhancement for detection of Rhodamine 6G molecules is demonstrated on two model nanostructures comprising either Au nano-crescents or Ag nano-wells fabricated by this method. Numerical simulations based on discrete dipole approximation (DDA) method show that the observed enhancement of the SERS signal for the given geometries originates in hot-spots localized at the tips of the nanocrescent. For the nanowell, the hotspots are mainly localized inside the cavity, on the side of the nanodonut, or at the edge of the bottom nanodisc when it is excited by a laser at the wavelength of 785 nm.

Ultrasensitive SERS detection of trinitrotoluene through capillarity-constructed reversible hot spots based on ZnO–Ag nanorod hybrids

Nanoscale ◽  
2015 ◽  
Vol 7 (18) ◽  
pp. 8619-8626 ◽  
Author(s):  
Xuan He ◽  
Hui Wang ◽  
Zhongbo Li ◽  
Dong Chen ◽  
Jiahui Liu ◽  
...  
Keyword(s):  
Hot Spots ◽  
Sers Substrates ◽  
Sers Detection

Ultra-sensitive ZnO–Ag hybrid SERS substrates are used to detect TNT vapor or solution by a capillarity-constructed reversible hot spots strategy.

Nanocomposite Route to Ultra-sensitive Surface Enhanced Raman Scattering Substrates

2010 ◽  
Vol 1253 ◽  
Author(s):  
Abhijit Biswas ◽  
Ilker Bayer ◽  
Alexandru S. Biris
Keyword(s):  
Hot Spots ◽  
Direct Detection ◽  
Single Step ◽  
Metal Nanoparticle ◽  
Label Free ◽  
Step Method ◽  
Sers Substrates ◽  
The Matrix ◽  
Polymer Metal ◽  
Metal Nanocomposites

AbstractWe show a novel route to prepare SERS substrates, which is based on polymer–metal nanocomposites with a specific structure and composition just below the percolation threshold. The neighboring nanoparticles are still quite densely packed, but remain separated by narrow polymer gaps (<1 nm). Such a nanostructure allows the creation of densely packed hot spots where electromagnetic energy can be confined. The polymer–metal nanocomposites are fabricated by a simple and single-step method of electron-beam-assisted vapor-phase co-deposition. The preparation of the SERS substrates is based on a simple plasma-etching process, which removes the polymer structures that allow the formation of metal nanoparticle SERS nano-aggregates with very uniform and controllable inter-particle gaps. The method results in “ideal SERS hot spots” throughout the matrix. These hot spots can be created over very large areas. The prepared SERS substrates are promising candidates for the direct detection (label-free) and analysis of various biological and chemical samples.

scholarly journals Synthesis of Gold Nanoparticle Stabilized on Silicon Nanocrystal Containing Polymer Microspheres as Effective Surface-Enhanced Raman Scattering (SERS) Substrates

Nanomaterials ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1501
Author(s):  
Guixian Zhu ◽  
Lin Cheng ◽  
Gannan Liu ◽  
Lianqing Zhu
Keyword(s):  
Raman Scattering ◽  
Metal Nanoparticles ◽  
Hot Spots ◽  
Sers Substrate ◽  
Silicon Nanocrystal ◽  
Biological Detection ◽  
Sers Substrates ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

Developing ideal surface-enhanced Raman scattering (SERS) substrates is significant in biological detection. Compared with free non-aggregated noble metal nanoparticles, loading metal nanoparticles on a large matrix can achieve a higher SERS effect due to the existence of many “hot spots”. A novel SERS substrate with intense “hot spots” was prepared through reducing gold ions with silicon nanocrystal containing polymer microspheres. The substrate exhibits high SERS sensitivity with an enhancement factor of 5.4 × 107. By applying 4-mercaptopyridine as a Raman reporter, the developed SERS substrate can realize measurement of pH values. The intensity ratio of 1574 to 1607 cm−1 of 4-mercaptopyridine showed excellent pH sensitivity, which increased as the surrounding pH increased. With good stability and reliability, the pH sensor is promising in the design of biological detection devices.

Interfacial-Tension-Directed Self-Assembly of Nanowires on Superhydrophobic Surfaces

2008 ◽  
Author(s):  
Yao-Tsan Tsai ◽  
Wei Xu ◽  
Eui-Hyeok Yang ◽  
Chang-Hwan Choi
Keyword(s):  
Interfacial Tension ◽  
Self Assembly ◽  
Porous Alumina ◽  
Superhydrophobic Surfaces ◽  
High Rate ◽  
Surface Pattern ◽  
Self Assembled Monolayer ◽  
Alumina Membrane ◽  
Three Phase ◽  
Assembly Technique

This paper describes a novel method of nanowire assembly using a superhydrophobic surface as a template. Well-defined superhydrophobic structures on a template surface direct the site-specific self-assembly of nanowires due to interfacial tension in evaporation, enabling simple but highly-efficient and ordered assembly of nanowires. High-aspect-ratio (HAR) microstructures with tapered tips are fabricated by deep reactive ion etch (DRIE) and are coated with a self-assembled monolayer (SAM) of octadecyltrichlorosilane (OTS) for hydrophobicity. Nickel nanowires are fabricated in a porous alumina membrane by electrodeposition. A uniformly-dispersed nanowire suspension is dispensed and evaporated on the superhydrophobic template surface. Due to surface superhydrophobicity, a three-phase (i.e., liquid-solid-gas) interface is created on the surface structures, enabling the nanowires to reside only over the interface. After complete evaporation, the nanowires are mostly left on the structural tips, driven by the interfacial forces constituted at the three-phase boundary. Although the alignment yield rate of the nanowires to the surface pattern has not reached 100%, current experimental results demonstrate that the idea of using interfacial tension on superhydrophobic surfaces can serve as a novel nano-assembly technique with high throughput and high rate. The key parameters affecting the yield of self-assembly and alignment will continue to be studied for further improvement.

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