Nanomechanical Cantilever Motion Generated by a Surface-Confined Redox Reaction

Quist, Florence; Tabard‐Cossa, Vincent; Badia, Antonella

doi:10.1021/jp0355915

Cited by 38 publications

(46 citation statements)

References 61 publications

(152 reference statements)

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“…18,25 The monolayer thicknesses of FcC 6 SAu, FcC 11 SAu, and FcC 12 SAu vary linearly with chain length, and the values correspond well with published results. 13,14,42 The ferrocene surface coverages and The Journal of Physical Chemistry C ARTICLE ellipsometric thicknesses are consistent with a saturated monolayer coverage. Ex situ PM-IRRAS was used to compare the polymethylene chain order of the FcC 11 SAu, FcC 12 SAu, Fc(CO)C 11 SAu, and C 12 SAu SAMs ( Table 2).…”

Section: ' Introductionmentioning

confidence: 70%

Microcantilevers Modified with Ferrocene-Terminated Self-Assembled Monolayers: Effect of Molecular Structure and Electrolyte Anion on the Redox-Induced Surface Stress

Norman

Badia

2010

J. Phys. Chem. C

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and Regroupement qu eb ecois sur les mat eriaux de pointe, C.P. 6128 succursale Centre-ville, Montr eal, QC H3C 3J7 Canada b S Supporting InformationABSTRACT: The redox-activated deflection of microcantilevers has attracted interest for chemical sensing and nanoactuation. However, the development and optimization of this type of microcantilever transduction requires a better understanding of the effect of the particular system parameters on the surface stress changes that cause the measured bending response. We investigate here the effects of the adsorbate structure and electrolyte anion on the surface stress generated by the electrochemical oxidation of ferrocene-terminated self-assembled monolayers (SAMs) chemisorbed to the surface of gold-coated microcantilevers. Ferrocenylalkanethiolate-modified cantilevers are an interesting system for study as the electroactive monolayer can induce charge-normalized surface stress changes that are at least 10-fold greater than those generated by multilayers of the conducting polymers commonly used for electroactuation. The resonance angle shifts measured by surface plasmon resonance spectroscopy in the presence of ClO 4 -suggest that the extent of the oxidationinduced SAM reorganization is the same for short (n = 6) and long (n = 12) chain ferrocenylalkanethiolate (FcC n SAu) SAMs and for a long chain carbonyl derivative (Fc(CO)C 11 SAu). The magnitude of the measured cantilever deflection is however not the same for the different SAMs, reflecting differences in the tensile contributions to the overall surface stress of the SAM elasticity and wettability versus the compressive lateral pressure generated by the collective molecular reorientations induced by the pairing of anions to the surface-confined, oxidized ferrocenium cations. The hydrophobic anions PF 6 -and ClO 4 -, which form 1:1 contact ion pairs with the SAM-bound ferrocenium cations, give reversible cantilever deflections and the largest compressive surface stress changes. By contrast, oxidation of the FcC 11 SAu SAM in NO 3 -and F -, which exhibit the poorest ion-pairing abilities of the anions investigated, results in an irreversible deformation of the cantilever bending and smaller stress changes. The surface phenomena that give rise to the observed differences in the surface stress as a function of the ion pairing ability are discussed.

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Section: ' Introductionmentioning

confidence: 70%

Microcantilevers Modified with Ferrocene-Terminated Self-Assembled Monolayers: Effect of Molecular Structure and Electrolyte Anion on the Redox-Induced Surface Stress

Norman

Badia

2010

J. Phys. Chem. C

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“…Ferrocenyl derivatives are thus ideal candidates for redox chemistry. New and innovative applications are emerging that exploit the redox properties of the ferrocenes [4], for instance in the design of electrochemically active sensors [5].…”

Section: Introductionmentioning

confidence: 99%

Hybrid iodoperfluoroalkane-ferrocene supramolecular arrays: the shortest contacts iodine forms with nitrogen atoms and unsaturated moieties

Amati

Lelj

Liantonio

et al. 2004

Journal of Fluorine Chemistry

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“…A chemical vapor sensor based on the bimetal technique is described in [78]. The measurement of electrochemical redox reactions with cantilevers is reported [79]. In biochemical applications, detection of DNA [80,81], proteins [82], prostate-specific antigen (PSA) [83], peptides using antibodies [84] and living cells [85] is possible.…”

Section: Recent Literature and Outlookmentioning

confidence: 99%

Microcantilever Sensors

Lang¹,

Gerber²

2008

Topics in Current Chemistry

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Microfabricated cantilevers have been used in atomic force microscopy for the topography imagingof non-conductive surfaces for more than 20 years. Cantilever beams without tips have proved theirapplicability in recent years as miniaturized, ultrasensitive, and fast-responding sensors for applicationsin chemistry, physics, biochemistry, and medicine. Microcantilever sensors respond by bending dueto the absorption of molecules. A shift in resonance frequency also occurs. They can be operatedin different environments such as gaseous environment, liquids, or vacuum. In gas, microcantileversensors can be operated as an artificial nose, whereby the bending pattern of a microfabricatedarray of eight polymer-coated silicon cantilevers is characteristic of the different vapors from solvents,flavors, and beverages. When operated in a liquid, microcantilever sensors are able to detectbiochemical reactions. Each cantilever is functionalized with a specific biochemical probe receptor,sensitive for detection of the corresponding target molecule. Applications lie in the fields of label-and amplification-free detection of DNA hybridization, the detection of proteins as well as antigen-antibodyreactions, and the detection of larger entities, such as bacteria and fungi.

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Nanomechanical Cantilever Motion Generated by a Surface-Confined Redox Reaction

Cited by 38 publications

References 61 publications

Microcantilevers Modified with Ferrocene-Terminated Self-Assembled Monolayers: Effect of Molecular Structure and Electrolyte Anion on the Redox-Induced Surface Stress

Microcantilevers Modified with Ferrocene-Terminated Self-Assembled Monolayers: Effect of Molecular Structure and Electrolyte Anion on the Redox-Induced Surface Stress

Hybrid iodoperfluoroalkane-ferrocene supramolecular arrays: the shortest contacts iodine forms with nitrogen atoms and unsaturated moieties

Microcantilever Sensors

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