Phase transitions of an ionic liquid self-assembled monolayer on Au

被引：8

作者：

Branca, Mathieu ^{[1
,2
]}

Correia-Ledo, Debby ^{[1
]}

Bolduc, Olivier R. ^{[1
]}

Ratel, Mathieu ^{[1
]}

Schmitzer, Andreea R. ^{[1
]}

Masson, Jean-Francois ^{[1
]}

机构：

[1] Univ Montreal, Dept Chim, Montreal, PQ H3C 3J7, Canada

[2] Univ Versailles, Inst Lavoisier Versailles, UMR 8180, F-78035 Versailles, France

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2011年 / 13卷 / 25期

基金：

加拿大自然科学与工程研究理事会;

关键词：

ELECTRON-TRANSFER; ALKANETHIOLATE MONOLAYERS; TUNABLE WETTABILITY; GOLD ELECTRODE; CHAIN-LENGTH; SURFACE; TEMPERATURE; RAMAN; SPECTROSCOPY; BEHAVIOR;

D O I：

10.1039/c1cp20827f

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The properties of a surface modified with an ionic liquid self-assembled monolayer (IL-SAM) can be tuned by simply changing the deposition temperature. Mid-IR, SERS, and molecular modelling demonstrated that 1-(12-mercaptododecyl)-3-methylimidazolium bromide (MDMIBr) exhibited a crystalline monolayer for deposition temperatures below 25 degrees C. Above 25 degrees C, the aliphatic chain collapsed into a disordered conformation. At 40 degrees C, another phase transition occurs due to the imidazolium group tilting parallel to the surface. Consequently, the wettability of IL-SAM was tuned over a broad range of contact angle (from 20 degrees to nearly 40 degrees) by varying the deposition temperature. Permeation of redox mediators to a Au electrode coated with MDMIBr strongly depends on the net charge of the redox mediator. Electron transfer was excellent for neutral and negatively charged redox mediators on electrodes coated with IL-SAM regardless of deposition temperature.

引用

页码：12015 / 12023

页数：9

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