Self-Assembled Monolayer of Polyoxometalate on Gold Surfaces: Quartz Crystal Microbalance, Electrochemistry, and in-Situ Scanning Tunneling Microscopy Study

Content Provider	Semantic Scholar
Author	Tang, Zhiyong Liu, Shaoqin Wang, Erkang Dong, Shaojun
Copyright Year	2000
Abstract	A new kind of inorganic self-assembled monolayer (SAM) was prepared by spontaneous adsorption of polyoxometalate anion, AsMo11VO404-, onto a gold surface from acidic aqueous solution. The adsorption process, structure, and electrochemical properties of the AsMo11VO404- SAM were investigated by quartz crystal microbalance (QCM), electrochemistry, and scanning tunneling microscopy (STM). The QCM data suggested that the self-assembling process could be described in terms of the Langmuir adsorption model, providing the value of the free energy of adsorption at −20 KJ mol-1. The maximum surface coverage of the AsMo11VO404- SAM on gold surface was determined from the QCM data to be 1.7 × 10-10 mol cm-2, corresponding to a close-packed monolayer of AsMo11VO404- anion. The analysis of the voltammograms of the AsMo11VO404- SAM on gold electrode showed three pairs of reversible peaks with an equal surface coverage of 1.78 ×10-10 mol cm-2 for each of the peaks, and the value was agreed well with the QCM data. In-sit...
Starting Page	4946
Ending Page	4952
Page Count	7
File Format	PDF HTM / HTML
DOI	10.1021/la9907127
Alternate Webpage(s)	http://www1.udel.edu/chem/polenova/PDF/Polyoxometalates/POM_STM_gold_Langmuir2000.pdf
Alternate Webpage(s)	https://doi.org/10.1021/la9907127
Volume Number	16
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article