Enhanced Raman Scattering as a Probe for 4-Mercaptopyridine Surface-modified Copper Oxide Nanocrystals

Improved surface‐enhanced Raman scattering properties of TiO2 nanoparticles by Zn dopant

“…These changes can be attributed to the interaction between the adsorbed molecules and the TiO 2 substrate. [10,13,28] Similar changes of optical adsorption have been previously reported by Rajh et al [29] in the surface modification of TiO 2 NPs with enediol molecules, which was explained as due to the formation of CT complexes between adsorbed molecules and TiO 2 . After adsorption of 4-MBA on Zn-TiO 2 samples in this work, however, it is found that the optical absorption corresponding to the surface state of TiO 2 NPs can be further enhanced; moreover, its photoresponse is extended to about 520 nm, indicating that doped Zn ions can certainly enrich the surface state (surface defect) of TiO 2 and bring a further enhancement of the photoabsorption corresponding to the surface state of TiO 2 as well as relating to surface-modified 4-MBA molecules.…”

“…Hayashi et al [7] have reported some evidence for SERS on small GaP particles. SERS from molecules adsorbed on surfaces of semiconductor oxides such as NiO, [8] α-Fe 2 O 3 , [9] CuO, [10] and ZnO [11] has also been reported. Recently, Song et al [12] also detected SERS signals of 4-mercaptopyridine adsorbed on the surface of TiO 2 nanofibers coated with Ag nanoparticles (NPs).…”

Surface‐enhanced Raman scattering of 4‐mercaptopyridine on sub‐monolayers of α‐Fe2O3 nanocrystals (sphere, spindle, cube)

“…SERS from molecules adsorbed on surfaces of oxides such as NiO, [11] ZnO, [12] TiO 2 , [12] Fe 3 O 4, [13] Cu 2 O, [14] Ag 2 O [15] and other compounds such as AgX (X = Cl, Br, I) [16 -18] have also been reported. More recently, Zhao's group has used 4-mercaptopyridine (4-Mpy) as probe molecules for the investigation of SERS effect on ZnO, [19] ZnS, [20] CdS, [21] CuO, [22] CdTe [23] and TiO 2 , [24] and proposed that charge transfer makes the dominant contribution for enhancement. It is worth mentioning that these semiconductor substrates were almost randomly arranged, although arrays of metal nanoparticles have been considered to be robust SERS-active substrates, owing to their advantages such as uniform roughness, high sensitivity, reproducibility, easy fabrication and long time stability.…”

Branched zinc oxide nanorods arrays modified paper electrode for electrochemical immunosensing by combining biocatalytic precipitation reaction and competitive immunoassay mode

“…In this process, PATP molecules were connected to ZnO due to the formation of Zn-S bond between the thiol group of the PATP molecules and ZnO (Wang et al, 2007); on the other hand, the remaining amino groups of PATP molecules could bind to the Ab in the presence of glutaraldehyde (GLD). The electrode was incubated with 2.5% GLD (10 μL) for 2 h at room temperature, followed by rinsing with PBS (pH 7.4) several times.…”