scholarly journals Reusable Surface-Enhanced Raman Spectroscopy Substrates Made of Silicon Nanowire Array Coated with Silver Nanoparticles Fabricated by Metal-Assisted Chemical Etching and Photonic Reduction

Nanomaterials ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 1531 ◽  
Author(s):  
Shi Bai ◽  
Yongjun Du ◽  
Chunyan Wang ◽  
Jian Wu ◽  
Koji Sugioka

Surface-enhanced Raman spectroscopy (SERS) has advanced over the last four decades and has become an attractive tool for highly sensitive analysis in fields such as medicine and environmental monitoring. Recently, there has been an urgent demand for reusable and long-lived SERS substrates as a means of reducing the costs associated with this technique To this end, we fabricated a SERS substrate comprising a silicon nanowire array coated with silver nanoparticles, using metal-assisted chemical etching followed by photonic reduction. The morphology and growth mechanism of the SERS substrate were carefully examined and the performance of the fabricated SERS substrate was tested using rhodamine 6G and dopamine hydrochloride. The data show that this new substrate provides an enhancement factor of nearly 1 × 108. This work demonstrates that a silicon nanowire array coated with silver nanoparticles is sensitive and sufficiently robust to allow repeated reuse. These results suggest that this newly developed technique could allow SERS to be used in many commercial applications.

2012 ◽  
Vol 51 (2) ◽  
pp. 02BP09 ◽  
Author(s):  
Shinya Kato ◽  
Yuya Watanabe ◽  
Yasuyoshi Kurokawa ◽  
Akira Yamada ◽  
Yoshimi Ohta ◽  
...  

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Nan Chen ◽  
Ting-Hui Xiao ◽  
Zhenyi Luo ◽  
Yasutaka Kitahama ◽  
Kotaro Hiramatsu ◽  
...  

Abstract Surface-enhanced Raman spectroscopy (SERS) is a powerful tool for vibrational spectroscopy as it provides several orders of magnitude higher sensitivity than inherently weak spontaneous Raman scattering by exciting localized surface plasmon resonance (LSPR) on metal substrates. However, SERS can be unreliable for biomedical use since it sacrifices reproducibility, uniformity, biocompatibility, and durability due to its strong dependence on “hot spots”, large photothermal heat generation, and easy oxidization. Here, we demonstrate the design, fabrication, and use of a metal-free (i.e., LSPR-free), topologically tailored nanostructure composed of porous carbon nanowires in an array as a SERS substrate to overcome all these problems. Specifically, it offers not only high signal enhancement (~106) due to its strong broadband charge-transfer resonance, but also extraordinarily high reproducibility due to the absence of hot spots, high durability due to no oxidization, and high compatibility to biomolecules due to its fluorescence quenching capability.


RSC Advances ◽  
2016 ◽  
Vol 6 (96) ◽  
pp. 93649-93659 ◽  
Author(s):  
S. A. Kara ◽  
A. Keffous ◽  
A. M. Giovannozzi ◽  
A. M. Rossi ◽  
E. Cara ◽  
...  

Flexible silicon nanowires fabricated by nano spheres lithography and metal assisted chemical etching for surface enhanced Raman spectroscopy.


2012 ◽  
Vol 51 (2S) ◽  
pp. 02BP09 ◽  
Author(s):  
Shinya Kato ◽  
Yuya Watanabe ◽  
Yasuyoshi Kurokawa ◽  
Akira Yamada ◽  
Yoshimi Ohta ◽  
...  

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Hairui Ren ◽  
Zhaoyang Chen ◽  
Xin Zhang ◽  
Yongmei Zhao ◽  
Zheng Wang ◽  
...  

Concentrations of S-Adenosyl-L-Methionine (SAM) in aqueous solution and fermentation liquids were quantitatively determined by surface-enhanced Raman scattering (SERS) and verified by high-pressure liquid chromatography (HPLC). The Ag nanoparticle/silicon nanowire array substrate was fabricated and employed as an active SERS substrate to indirectly measure the SAM concentration. The linear relationship between the integrated intensity of peak centered at ~2920 cm−1in SERS spectra and the SAM concentration was established, and the limit of detections of SAM concentrations was analyzed to be ~0.1 g/L. The concentration of SAM in real solution could be predicted by the linear relationship and verified by the HPLC detection method. The relative deviations (δ) of the predicted SAM concentration are less than 13% and the correlation coefficient is 0.9998. Rolling-Circle Filter was utilized to subtract fluorescence background and the optimal results were obtained when the radius of the analyzing circle is 650 cm−1.


2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Yudong Lu ◽  
Shanyuan Feng ◽  
Xueyun Liu ◽  
Lihui Chen

A good Ag-based SERS substrate has been prepared by one-pot reaction using methyl cellulose as a template. Effects of methyl cellulose concentration, silver ammonia chloride solution concentration, reaction duration, and reducing agent on silver nanoparticles were discussed in this paper. The performance of the obtained Ag nanoparticles was characterized by UV-visible spectroscopy, transmission electron microscopy, and surface-enhanced Raman spectroscopy. Results show that the reducing agent plays a crucial role in the performance of silver nanoparticles. Optimum preparation conditions of synthesis of SERS substrates were as follows: 10 mM silver ammonia chloride and 0.2% MC at 75°C, reducing in 0.2% reducing agent at 120 min. TEM studies reveal that particles are mostly spherical and rod in shape with an average size of 80 nm. Silver nanoparticles prepared with MC as a template have been shown to provide strong SERS enhancement signals of R6G, which can be used as a good Ag-based SERS substrate in the analytical environment for routine measurements.


2019 ◽  
Vol 29 (4) ◽  
pp. 521
Author(s):  
Tran Cao Dao ◽  
Truc Quynh Ngan Luong ◽  
Tuan Anh Cao ◽  
Ngoc Minh Kieu

Sudan dyes are red colorants banned from use for food due to their toxic properties. However, because of the cheapness, they are sometimes adulterated into food illegally. Currently surface-enhanced Raman spectroscopy (SERS) is emerging as a good method to detect residues (including trace amounts) of Sudan dyes in food. In this report we present the SERS detection of Sudan I (a type of Sudan dyes) to concentrations as low as 1 ppb, using a very simple SERS substrate, which is made from silver nanoparticles chemically deposited on silicon surface.


Nanoscale ◽  
2015 ◽  
Vol 7 (45) ◽  
pp. 18992-18997 ◽  
Author(s):  
Pengcheng Dai ◽  
Yanming Xue ◽  
Xuebin Wang ◽  
Qunhong Weng ◽  
Chao Zhang ◽  
...  

We designed a novel pollutant capturing surface enhanced Raman spectroscopy (SERS) substrate based on boron nitride microfibers uniformly decorated with silver nanoparticles.


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