Ag Nanoparticle-Mediated Raman Scattering of 4-Aminobenzenethiol on a Pt Substrate
Raman scattering measurements were conducted for 4-aminobenzenethiol (4-ABT) monolayers assembled on a macroscopically smooth Pt substrate. At the beginning, no Raman peak was detected for 4-ABT on Pt, but upon attaching Ag nanoparticles to the amine groups of 4-ABT on Pt (Ag@4-ABT/Pt), distinct Raman spectra were observed. Considering the fact that almost no Raman peaks are observed when Ag nanoparticles are attached to 4-aminophenylsilane monolayers assembled on a silicon wafer, the Raman spectra observed for Ag@4-ABT/Pt must be surface-enhanced Raman scattering (SERS) spectra, occurring through an electromagnetic (EM) coupling of the localized surface plasmon of Ag nanoparticles with the surface plasmon polariton of the Pt substrate. From the excitation wavelength dependence, we also confirmed the contribution of the charge-transfer enhancement in the SERS spectra of Ag@4-ABT/Pt: it became more important at short-wavelength excitation. Overall, the SERS intensity of Ag@4-ABT/Pt gradually decreased as t...
In this Perspective, we present an overview of recent fundamental studies on the nature of the interaction between individual metal atoms and metal clusters and the conjugated surfaces of graphene and carbon nanotube with a particular focus on the electronic structure and chemical bonding a ... more
The first [ECE]Ni(II) pincer complexes with E = SiII and E = GeII metallylene donor arms were synthesized via C–X (X = H, Br) oxidative addition, starting from the corresponding [EC(X)E] ligands. These novel complexes were fully characterized (NMR, MS, and XRD) and used as catalyst for Ni-c ... more
Rohm and Haas Powder Coatings is delighted to announce that its Reading, Pennsylvania, facility is the first site in the world to receive the RCMS® Site Certification awarded by the American Chemical Council (ACC).
When Raj Gupta, Chairman and CEO of Rohm and Haas Company, became Chairman ... more