Surface enhanced Raman spectrum SERS

The surface-enhanced Raman spectra (SERS) provide information about the extent of protonation of the species adsorbed at the silver/aqueous solution interface. The compounds investigated were 4-pyridyl-carbinol (1), 4-acetylpyridine (2), 3-pyridine-carboxaldehyde (3), isonicotinic acid (4), isonicotinamide (5), 4-benzoylpyridine (6), 4-(aminomethyl)pyridine (7) and 4-aminopyridine (8). For 1, the fraction of the adsorbed species which was protonated at -0.20 V vs. SCE varied with pH in a manner indicating stronger adsorption of the neutral than the cationic form. The fraction protonated increased at more negative potentials. Similar results were obtained with 3. For all compounds but 4, bands due to the unprotonated species near 1600 cm-1 and for the ring-protonated species near 1640 cm-1 were seen in the SERS spectra. 

Cyclic voltammetry of [Os(py)(NH3)5]3+ demonstrated the existence of [Os(py)(NH3)5]2+,62,90,91 and the surface-enhanced Raman spectra (SERS) of both species were measured recently,91,92 with... 

Salts of [OsL(NH3)5]3+ (L = pyrazine, pyrimidine, pyridazine) can be made by displacement of nitrogen from [Os(N2)(NH3)5]2+9° or from the triflato complex [0s(0S02CF3)(NH3)J]2+ and the ligands.62 Cyclic voltammetry showed reduction to the osmium(II) species, 90 and the surface-enhanced Raman spectra (SERS) of [Os(pyz)(HNH3)5]3+, [Os(pyz)(NH3)5]2+ and of their ammine-d5 derivatives were measured, as were the IR spectra.91... 

Surface-enhanced Raman spectra (SERS) of [Os(NH3)5bipy]3+ and its reduced form [Os(N-H3)5bipyf + have been measured.91... 

Scheme 3.16 Generation of nanotextured Ag film (AFM height image, top right) from sputtering on UV-ozone etched PS-APIP MS film (AFM height image, top left). Surface-enhanced Raman spectra (SERS) (bottom) of benzenethiol on nanotextured Ag films (10 and 15 nm and respectively) and...

Figure 13 Surface-enhanced Raman spectra (SERS) obtained from thin films of blends of polystyrene and deuterated polystyrene before (A) and after annealing (B). Samples and conditions as in Fig. 9. 

Figure 14 Surface-enhanced Raman spectra (SERS) obtained from an acrylic adhesive spin-coated onto silver island films from (A) 1% and (B) 5% solutions in acetone and (C) from the bulk adhesive ...

Optrodes that provide trace-level detection of trichloroethylene and chloroform with high accuracy have been developed. High accuracy is obtained by providing an internal intensity reference. Also, a diode laser has been used to measure surface-enhanced Raman spectra (SERS) of low levels of fluorescent molecules. Near-infiared SERS is shown to be a useful technique for remote spectroscopic measurentents of aqueous contaminants. In addition, a temperature optrode has been used to obtain real-time temperature pioEles in a geothemoal well. 

Investigation of electrode solution interfaces by in situ vibrational spectroscopy has two principal advantages firstly the species present and their structures are directly characterized by their spectra and, secondly, these spectra are sensitive to the environment and therefore can be used to probe complex interactions. Raman spectroscopy is particularly well suited to the investigation of aqueous systems and in certain cases the adsorption of neutral species, of anions in the double layer and of the solvent (as well as interactions between these species) can now be characterized[48]. Vibrational spectroscopy of systems of practical importance is illustrated by the Surface Enhanced Raman Spectra (SERS) of the corrosion inhibitor thiourea adsorbed at silver and copper electrodes[49] it should be noted that inhibitors such as thiourea are also used as plating additives. 

H. Han, X. Yan, R. Dong, G. Ban, K. Li, Analysis of serum type II diabetes mellitus and diabetic complication using surface-enhanced Raman spectra (SERS). Appl. Phys. B 94, 667 (2009)... 

---