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 shu

Preparation of Dendritic Pt Thin Films and Their Anomalous Infrared Effects

1.
State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian Province, P. R. China

Received Date: 24 February 2012
Available Online: 8 May 2012
Fund Project: 国家自然科学基金(21073152, 20933004, 20833005, 21021002) (21073152, 20933004, 20833005, 21021002)福建省高校杰出青年科研人才培育计划(JA10003)资助项目 (JA10003)

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 (C_r), which increases from 9 to 36 as the deposition time increases. Maximum enhanced IR absorption of adsorbed CO (CO_ad) is observed at the deposition time of 6 min. Anomalous infrared effects for CO_ad are also seen on the dendritic Pt thin film electrodes. The line shapes of CO_ad 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 CO_ad in metal nanostructures.
- In situ Fourier transform infrared spectroscopy,
- Dendritic Pt thin film,
- Fano-like infrared effect,
- Surface enhanced IR absorption,
- Abnormal IR effect
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