Mercury Ion-Responsive Coalescence of Silver Nanoparticles on a Silica Nanoparticle Core for Surface-Enhanced Raman Scattering Sensing

Kim, Yoon-Hee; Hahm, Eunil; Pham, Xuan-Hung; Kang, Homan; Jeong, Dae-Hong; Chang, Hyejin; Jun, Bong-Hyun

doi:10.1021/acsanm.3c04843

Cited by 4 publications

(2 citation statements)

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“…SiO 2 @Ag NPs are structurally characterized as having an excellent LSPR, and the addition of RLCs gives them a great advantage in studies using a SERS-tagging material [ 36 , 41 ]. However, because of the nature of Ag NPs, dissolution or Ostwald ripening occurs during storage in the colloidal phase, causing structural deformation and poor signal consistency [ 9 , 35 ].…”

Section: Resultsmentioning

confidence: 99%

“…Although SiO 2 @Ag NPs offer the opportunity to exploit Ag NPs effectively and controllably, Ag NPs can become structurally unstable due to dissolution or Ostwald ripening during storage in the colloidal phase [ 35 ]. This unstable structure reduces the effectiveness of the hotspot and LSPR of SiO 2 @Ag@RLC NPs (as a SERS-tagging material), which can have a significant impact on the consistency of the SERS signal [ 32 , 36 ]. Several studies have been conducted to prevent the instability of Ag NPs [ 35 , 37 , 38 , 39 , 40 ].…”

Section: Introductionmentioning

confidence: 99%

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Effects of Raman Labeling Compounds on the Stability and Surface-Enhanced Raman Spectroscopy Performance of Ag Nanoparticle-Embedded Silica Nanoparticles as Tagging Materials

Yang,

Cho,

Kim

et al. 2024

Biosensors

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Surface-enhanced Raman spectroscopy (SERS) tagging using silica(SiO2)@Ag nanoparticles (NPs) is easy to handle and is being studied in various fields, including SERS imaging and immunoassays. This is primarily due to its structural advantages, characterized by high SERS activity. However, the Ag NPs introduced onto the SiO2 surface may undergo structural transformation owing to the Ostwald ripening phenomenon under various conditions. As a result, the consistency of the SERS signal decreases, reducing their usability as SERS substrates. Until recently, research has been actively conducted to improve the stability of single Ag NPs. However, research on SiO2@Ag NPs used as a SERS-tagging material is still lacking. In this study, we utilized a Raman labeling compound (RLC) to prevent the structural deformation of SiO2@Ag NPs under various conditions and proposed excellent SiO2@Ag@RLC-Pre NPs as a SERS-tagging material. Using various RLCs, we confirmed that 4-mercaptobenzoic acid (4-MBA) is the RLC that maintains the highest stability for 2 months. These results were also observed for the SiO2@Ag NPs, which were unstable under various pH and temperature conditions. We believe that SERS tags using SiO2@Ag NPs and 4-MBA can be utilized in various applications on based SERS because of the high stability and consistency of the resulting SERS signal.

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