One-dimensional CoPt nanorods and their anomalous IR optical properties

Anomalous IR Optical Properties of Monodispersed PtNi Nanoparticles

“…1, which shows that the adsorbed CO on bulk Pt electrode exhibits a normal IR adsorption. 25 From the results of Fig.3, we can see that the IR features of PtNi nanoparticles are different from those of COad on the bulk Pt electrode and shown a typical IR features of AIREs, 19,25 which have three distinct anomalous features: (1) the inversion of the direction of adsorbed CO; (2) the significant enhancement of IR absorption; and (3) the broadening of the width of adsorbed CO bands.…”

“…Fig.6 shows the in situ single beam spectra of CO adsorbed on NiPt/ GC electrode in 0.1 mol•L -1 H2SO4 solution at ES that is varied from -0.2 to 0.3 V. It can observe clearly that bipolar band with its positive peak near 2050 cm -1 and negative band near 2100 cm -1 is assigned to IR adsorption of COL adsorbates. In our previous work, 13,19,[23][24][25][26][27] it is impossible to observe the peaks of adsorbed CO in the in situ single beam spectra because of their weak enhancement. Then we have to obtain the resulting spectral equation (1) in the former studies.…”

“…The value of the enhancement factor is much greater than others we obtained previously. 19,20,[23][24][25][26] It is important to point out that the calculation of enhancement factor ΔIR is glancing because it is hard to define the baseline of the bipolar IR feature of the COad bands exactly. But the adsorbed CO shows a strong enhancement, which will be approved clearly from the next in situ single beam spectra.…”

“…21,22 Further investigation has showed that nanostructured Ni, Co thin film and CoPt nanorods also display anomalous IR properties. [23][24][25] It is important to note that the study of anomalous IR properties of nanomaterials with different morphologies and composition is of great importance in revealing the fundamentals of nanomaterials. 26 In this paper, we report the synthesis of PtNi nanoparticles by galvanic displacement reaction.…”