Gold-Nanorod-Coated Capillaries for the SERS-Based Detection of Thiram

Abstract

Surface-enhanced Raman scattering (SERS)based capillary system is a promising route toward fast, realtime, and in-situ detection using a facile sampling process. Here, we demonstrate for the first time resonance-tunable SERSactive capillaries with high sensitivity, reproducibility, and stability. The strong signal consistency independent of measurement spots or storage time supports the long-term storage and signal tracking of analytes in practical use. The capillaries were successfully applied to the in-situ detection of pesticide residues, and the sampling process provides operation conveniency compared to conventional methods. These results indicate that our SERS-active capillaries have great potentials in fast in-situ detection for many practical applications.

4-Mercaptobenzoic Acid Labeled Gold-Silver-Alloy-Embedded Silica Nanoparticles as an Internal Standard Containing Nanostructures for Sensitive Quantitative Thiram Detection

“…Compared with HPLC-MS, SERS does not require harsh solvents and a high power source, and it is easily compatible with other detection systems [21]. As a result, many studies have focused on the use of different nanoparticles (NPs) as substrates for SERS detection of pesticides, such as silver nanostructures [21,22,23,24,25,26], gold nanostructures [27,28,29,30,31], and graphene oxide [32,33]. Although these nanostructures could enhance the SERS signal up to 10 14 times, the practical application of SERS exhibits some technical challenges in the fabrication of reproducible, reliable, and robust SERS-active surfaces.…”

Morphology-Tailored Gold Nanoraspberries Based on Seed-Mediated Space-Confined Self-Assembly

“…The gold nanoparticles were prepared via a slightly modified seed growth method used in our prior work [20]. Briefly, 50 mL HAuCl 4 solution (0.25 mM) was heated to boiling and then 1.5 mL of 34 mM sodium citrate solution was rapidly injected into the boiling solution and kept boiling for 10 min.…”

“…Besides, the construction of metallic architectures, which can be achieved with raspberry-like structure as well, has become a research hotspot recently due to their superiority in providing high accessibility to catalytically active metal surfaces, which is of benefit for promising applications such as catalysis, energy storage and sensors [11,12,13,14,15]. In particular, when the raspberry-like structure is decorated with gold nanoparticles which are high-quality building blocks for complex plasmonic architectures, the collective plasmon resonances occur, which can behave completely differently from the individual ones [16,17,18,19,20]. The high degree of symmetry and strong interparticle coupling of the raspberry-like structure offers a new platform to tailor the plasmonic and magnetic resonances of nanoparticles [21,22,23,24,25].…”

The rationality of using core–shell nanoparticles with embedded internal standards for SERS quantitative analysis based glycerol-assisted 3D hotspots platform

“…7). The Raman peak intensity ratio for thiram [52][53][54] (561 cm À1 and 1386 cm À1 ) and 4-Mpy (1095 cm À1 ) displayed a relatively better linear relationship with the concentration of thiram than the I 561 and I 1386 vs. Àlog[thiram] plots. In other words, the embedded IS of Au@4-Mpy@AgNPs can be used to calibrate the signal strength of thiram, indicating that the obtained Au@4-Mpy@AgNPs can quantitatively detect thiram.…”