Effect of chain length of some 2D and 3D alkanethiols on gold studied by DSC and voltammetry

Gyepi-Garbrah, Samuel H.; Šimon, Peter; Šilerová, Roberta

doi:10.1007/s10973-005-6928-9

Cited by 2 publications

(5 citation statements)

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“…This nonreversibility was also reported for organic SAM. 22,35 The existence of a unique critical temperature observed with various analytical techniques was previously reported for organic SAM. 33 Similarly, IL-SAM also demonstrated a concordance of the several experimental measurements, for the deposition temperature at which the phase transitions occurred.…”

Section: Vibrational Spectroscopy Analysis Of Mdmibr-sammentioning

confidence: 67%

“…The formation of a disordered monolayer at deposition or observation temperature higher than the phase transition is manifested by a change in wettability, thickness of the monolayer, of vibrational frequency, and electron transfer properties. 21,22,32,33,[35][36][37] Also, the phase transition induces a nonreversible change of molecular structure in the timescale of the experiments, previously reported to be at least two weeks. 22 This article aims at answering these questions for IL-SAM: do IL-SAM undergo the same phase transition as organic SAM and how does deposition temperature influence the properties of resulting IL-SAM?…”

Section: Resultsmentioning

confidence: 86%

“…21,22,32,33,[35][36][37] Also, the phase transition induces a nonreversible change of molecular structure in the timescale of the experiments, previously reported to be at least two weeks. 22 This article aims at answering these questions for IL-SAM: do IL-SAM undergo the same phase transition as organic SAM and how does deposition temperature influence the properties of resulting IL-SAM?…”

Section: Resultsmentioning

confidence: 86%

“…Electron transfer kinetics of SAM-modified electrodes strongly depends on the crystallinity of the monolayer, 21,22 charge of the monolayer and on the charge of the redox mediator. 24 Thus, the cyclic voltammograms of a-methylferrocene methanol (Fc-CH(OH)-CH 3 ), Fe(CN) 6 4À/3À , and Ru(NH 3 ) 6…”

Section: Electrochemical Properties Of Il-sammentioning

confidence: 99%

“…The electrochemical properties of a neutral alkyl thiol selfassembled monolayer depend on the deposition temperature. 21,22 For example, C 16 and C 18 alkyl chain thiols are insulating below a critical deposition temperature. Above the critical deposition temperature, the monolayers exhibited increased electron transfer as measured with Fe(CN) 6 4À/3À…”

Section: Introductionmentioning

confidence: 99%

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

Branca

Correia-Ledo

Bolduc

et al. 2011

Phys. Chem. Chem. Phys.

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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 °C. Above 25 °C, the aliphatic chain collapsed into a disordered conformation. At 40 °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° to nearly 40°) 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.

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Section: Vibrational Spectroscopy Analysis Of Mdmibr-sammentioning

confidence: 67%