Microplasma synthesized gold nanoparticles for surface enhanced Raman spectroscopic detection of methylene blue

Abstract

Surface enhanced Raman scattering (SERS) is a powerful and sensitive spectroscopic technique that allows for rapid detection of trace-level chemical species in a non-invasive and non-destructive manner.

Microfluidic Plasma-Based Continuous and Tunable Synthesis of Ag–Au Nanoparticles and Their SERS Properties

“…When incident light interacts with AgNPs or AuNPs, they can convert light into localized electric fields, contributing to drastically increased Raman signals. 38 For the Au−Ag nanoalloys, they have a similar mechanism regarding the SERS enhancement. However, alloying of the two metals changes their energy levels as well as the electronic transitions.…”

“…In our case, both AgNPs and AuNPs have different plasmonic electrical fields, EE and CE. When incident light interacts with AgNPs or AuNPs, they can convert light into localized electric fields, contributing to drastically increased Raman signals . For the Au–Ag nanoalloys, they have a similar mechanism regarding the SERS enhancement.…”

“…All spectra were collected in the 400–1800 cm –1 spectral region, with a data acquisition time of 10 s for each spectrum. The SERS substrates were produced by an immersion method according to previous studies. , Specifically, silicon wafers (5 × 5 mm 2 ) were cleaned in an ultrasonic bath using ethanol and acetone for 15 min, before being rinsed with deionized water. Then, the silicon wafers were immersed in 10 mL of the microfluidic plasma-generated solutions for 6 h. All samples were prepared in exactly the same manner to ensure the maximum possible consistency among samples.…”

Plasma parameters and the reduction potential at a plasma–liquid interface

“…Nonthermal atmospheric plasma interacting with liquids have been utilized for a variety of applications including wastewater treatment, [11][12][13] chemical conversion, [14][15][16][17] and nanomaterial synthesis. [18][19][20][21] These applications are based on electrochemical reactions induced by charge-transfer processes taking place across the interface formed between the plasma and electrolyte solution (i.e. plasma-liquid interface).…”

Plasma-Assisted Synthesis of Surfactant-Free and D-Fructose-Coated Gold Nanoparticles for Multiple Applications

“…The synthesized AuNPs showed excellent capability for the detection of cardiac troponin I [ 36 ]. Li et al employed microplasma-synthesized AuNPs with the size ranging from 4 to 12 nm for SERS-based trace detection of methylene blue [ 37 ]. They obtained enhancement factors of the order of 10 8 .…”