Citation: ZHOU Zhi-You, LIN Jian-Long, SHANG Shu-Jing, REN Jie, SUN Shi-Gang. Preparation of Dendritic Pt Thin Films and Their Anomalous Infrared Effects[J]. Acta Physico-Chimica Sinica, ;2012, 28(07): 1745-1750. doi: 10.3866/PKU.WHXB201205082
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Dendritic Pt thin films are electrodeposited on bulk Pt electrodes in 10×10-3 mol·L-1 K2PtCl6+3× 10-4 mol·L-1 PbAc2 + 0.5 mol·L-1 HClO4 using square-wave potential pulses. As the deposition time increases, the length of the Pt dendrites increases from 400 to 900 nm, and the distribution density of Pt nanoparticles (~10 nm), which consist of coiled Pt dendrites, increases greatly. From hydrogen adsorption/ desorption obtained from cyclic voltammograms (CV), the surface of the dendritic Pt thin film electrodes has a relative roughness (Cr), which increases from 9 to 36 as the deposition time increases. Maximum enhanced IR absorption of adsorbed CO (COad) is observed at the deposition time of 6 min. Anomalous infrared effects for COad are also seen on the dendritic Pt thin film electrodes. The line shapes of COad change with increasing deposition time, in order: bipolar→downward→bipolar→upward→bipolar→ downward bands. Fano-like infrared effects (bipolar), surface enhanced IR absorption (enhanced downward band), and abnormal IR effects (enhanced upward band) are highly dependent on the surface architecture of the nanostructures. The as-prepared dendritic Pt thin films provide model substrates for in-depth studies of the anomalous infrared effects of COad in metal nanostructures.
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