In this paper, novel organic sulfonic acid group-functionalized silica spheres (SiO2-SO3H) were chosen as a template for fabricating core-shell SiO2-SO3H@Ag composite spheres by the seed-mediated growth method. The SiO2-SO3H spheres could be obtained easily by oxidation of the thiol group-terminated silica spheres (SiO2-SH) with H2O2. Due to the presence of sulfonic acid groups, the [Ag(NH3)2](+) ions were captured on the surface of the silica spheres, followed by in-site reduction to silver nanoseeds for further growth of the silver shell. By this strategy, the complete silver shell could be obtained, and the surface morphologies and structures of the silver shell could be controlled by adjusting the number of sulfonic acid groups on the silica spheres. A large number of sulfonic acid groups on the SiO2-SO3H spheres favored the formation of the macroporous silver shell, which was unique and exhibited good catalytic performance and a high surface-enhanced Raman scattering (SERS) enhancement ability.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1021/acs.langmuir.5b02218 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Enhanced Structure Stability of Au Nanobipyramids by an Customized Silver Armor.
Nano Lett
January 2025
School of Materials Science and Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China.
Revealing the structure stability and evolution of gold nanocrystals at the atomic scale is crucial to their versatile applications; however, the fundamental mechanism remains elusive due to the lack of characterizations. In this work, the structural evolution of two types of Au nanobipyramids (Au NBPs) at elevated temperatures is monitored through electron microscopy analysis, and there is a sharp distinction between their structure stability despite that they possess the same crystalline structure. Detailed material characterization reveals that the surface alloying of residual Ag with Au (customized Ag armor) can greatly inhibit the Au atom diffusion and contribute remarkably to the stability and surface-enhanced Raman scattering improvement.
View Article and Find Full Text PDFSERS-based simplified analysis of paraquat in poisoning cases: Bypassing complicated pretreatment with antioxidant sensor.
Spectrochim Acta A Mol Biomol Spectrosc
December 2024
Department of Forensic Medicine, Nanjing Medical University, Nanjing 211166, China. Electronic address:
Applying antioxidant coating materials to prepare surface-enhanced Raman spectroscopy (SERS) sensing substrates can effectively enhance the sensitivity and stability for the analysis of molecules. In this study, we have leveraged SERS to develop an innovative sensor for the swift identification of Paraquat (PQ), enabling on-site detection of this herbicide. The newly devised sensor distinguishes itself through its exceptional oxidation resistance.
View Article and Find Full Text PDFTrace detection of S. aureus cells in food samples via RCA-assisted SERS signal amplification with core-shell nanoprobe.
Talanta
December 2024
School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, PR China; College of Ocean Food and Biological Engineering, Jimei University, Xiamen 361021, PR China. Electronic address:
Staphylococcus aureus (S. aureus) has been identified as a indicator of food contamination. In this study, a sensitive and accurate biosensor strategy for S.
View Article and Find Full Text PDFEngineering ultra-strong electron-phonon coupling and nonclassical electron transport in crystalline gold with nanoscale interfaces.
Nat Commun
January 2025
Department of Physics, Indian Institute of Science, Bangalore, India.
Electrical resistivity in good metals, particularly noble metals such as gold (Au), silver (Ag), or copper, increases linearly with temperature (T) for T > Θ, where Θ is the Debye temperature. This is because the coupling (λ) between the electrons and the lattice vibrations, or phonons, in these metals is weak, with λ ~ 0.1-0.
View Article and Find Full Text PDFControlled growth of silver on gold triangular nanoprisms: Improved surface enhanced Raman scattering for ultrasensitive detection of cancer biomarker.
J Colloid Interface Sci
December 2024
The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China. Electronic address:
The precise design and synthesis of Au and Ag composite nanomaterials can provide them with richer plasmonic modes, resulting in enhanced optical properties. Here, a novel strategy was demonstrated to control the selective deposition of Ag at different positions of Au triangular nanoprisms (Au TNPs). 1,4-benzenedithiol (BDT) was selectively absorbed in different positions of Au TNPs which made Ag selectively deposited on Au TNPs.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!