Tribological Behavior of Terphenyl Self-Assembled Monolayer Studied by a Pin-on-Plate Method and Friction Force Microscopy

Nakano, Miki; Ishida, Takao; Numata, Toshimitsu; Ando, Yasuhisa; Sasaki, Shinya

doi:10.1143/jjap.43.4619

Cited by 11 publications

(16 citation statements)

References 19 publications

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“…This is important in that tribological stress could be applied exclusively onto the SAM films, i.e., without penetrating to the underlying substrate, and thus their tribological properties as boundary-lubricant films can be probed. In contrast, tribological contacts involving SAM films probed by more conventional, macroscale approaches, such as pin-on-disk tribometry [19][20][21][22][23][24], have generally resulted in irreversible damage to the samples, both the SAM films and the supporting substrates, which renders the interpretation of the observed tribological properties far more complicated.…”

Section: Introductionmentioning

confidence: 99%

Macroscopic Tribological Testing of Alkanethiol Self-assembled Monolayers (SAMs): Pin-on-disk Tribometry with Elastomeric Sliding Contacts

et al. 2007

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We demonstrate that the frictional properties of alkanethiol self-assembled monolayers (SAMs) with various surface-chemical and structural features can be investigated on a macroscopic scale by employing an elastomer as the sliding partner in pin-on-disk tribometry. The mild contact conditions at the elastomeric tribological interface allow the SAM films to remain virtually intact despite the tribological stress. Sliding contact between SAMs and elastomers over the speed range available from an ordinary tribometer in a liquid environment induced a broad range of lubrication mechanisms, ranging from boundary to fluid-film lubrication regimes. Thus, the impact of both the chemical and structural characteristics of SAMs on the formation of fluid films and interfacial friction forces could be probed in the absence of wear processes. Given the large SAM ''toolbox'' that is readily available for the modification of surface-chemical characteristics, this approach provides an opportunity to investigate the influence of surface chemistry on the frictional properties of elastomeric tribological contacts.

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Section: Introductionmentioning

confidence: 99%

Macroscopic Tribological Testing of Alkanethiol Self-assembled Monolayers (SAMs): Pin-on-disk Tribometry with Elastomeric Sliding Contacts

et al. 2007

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“…Figure 6 shows that the effects of molecules appeared only in the low normal load region. In our previous study [14], we analyzed normal octadecanethiol SAM surfaces after friction tests by XPS. In that study, 95% of the molecules remained on surface after a sliding distance of 180 m under a load of 30 mN.…”

Section: The Effects Of Molecules Upon the Friction Propertiesmentioning

confidence: 99%

“…Another reason is that the SAM formation process on Au substrates is easier than that on other substrates such as silicon made from organosilianol compounds. For example, the authors have investigated the tribological behavior of organosulfur molecule SAMs on Au using a pin-on-plate method [13][14][15]. In our previous study, we found that the friction coefficients were dependent on the alkyl chain length and that even a monolayer film was sufficiently durable against friction, although the friction coefficients were slightly high at 0.2 to 0.4.…”

Section: Introductionmentioning

confidence: 96%

“…Basic studies on the tribological properties of SAMs have been also performed using organosulfur on Au [12][13][14][15] for a number of reasons. One reason is that there are many kinds of organosulfur compounds which can easily form SAMs.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, further measurements to increase their durability against friction are required. We also investigated the frictional properties of terphenyl methane thiol (TP1) SAMs [14]. Oligophenylene SAMs containing phenyl rings are also expected to be good surface coating materials because they have been predicted to be rigid [16].…”

Section: Introductionmentioning

confidence: 99%

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Effects of Structure on the Tribological Properties of Organic Self-Assembled Molecular Layers

Nakano

Miyake

2013

Tribology Online

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The tribological properties of self-assembled monolayers (SAMs) on Au were investigated with a focus on the effects of the structure and end groups of the molecules upon the frictional properties of the modified surfaces of the SAMs. Three kinds of organothiols were used: HS-(CH 2 ) 11 -(O-CH 2 -CH 2 ) 3 -OCH 3 : EG3OMe, CH 2 -(CH 2 ) 15 -SH: HDT, and OH-(CH 2 ) 16 -SH: HDTOH. The SAM surfaces were characterized by contact angle measurements of pure water, X-ray photoelectron spectroscopy, and infrared reflection absorption spectroscopy. The frictional properties were examined using a pin-on-plate tribometer. The friction coefficients of the SAM surfaces were similar to the bare Au surface in the high normal load region. In the low normal load region, HDT SAMs exhibited lower friction coefficients than HDTOH SAMs. The end groups affected the friction coefficients for the same chain structures. The friction coefficients of the EG3OMe SAMs were lower than those of HDT SAMs. The HDT SAMs were thought to have well-organized structures. On the other hand, the EG3OMe SAMs probably had more flexible structures than the HDT SAMs because of their ethylene glycol chains, indicating that the chain structures as well as the end groups affected the friction coefficients of the SAMs.

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Effects of Tail Group and Chain Length on the Tribological Behaviors of Self-Assembled Dual-Layer Films in Atmosphere and in Vacuum

Qian

et al. 2008

Tribol Lett

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In the present study, three kinds of selfassembled dual-layer films with various tail groups and chain length were prepared by adsorption of different carboxylic acids (stearic acid, STA; propionic acid, PPA; and phenylacetic acid, PAA) to the top of 3-aminopropyltriethoxysilane (APS) film on silicon surface. Using an atomic force microscopy, the films were found to reveal smaller adhesion and friction forces in vacuum than in atmosphere. Due to the effect of the adsorbed water layer on the samples, the more hydrophilic film exhibited the larger difference between the friction forces in vacuum and in atmosphere. For the dual-layer films either in atmosphere or in vacuum, the densely packed long chains can lead to lower friction than the poor-packed short chains, and the tail phenyl groups may induce higher friction than the methyl groups. In the initial stage of nanowear process by a diamond tip, a series of hillocks were observed on silicon surface along the scratching line. It was found that all the films can effectively enhance the antiwear ability of silicon surface and the self-assembled dual-layer film terminated by long chains (STA/APS) or -C 6 H 5 groups (PAA/APS) performed much better than that terminated by short chains. Finally, the microwear abilities of the films were examined on a universal micro-tribometer. With the increase in normal load from 50 to 200 mN, the wear life varied for different films and good antiwear performances were also assigned to STA/APS and PAA/APS. This work can be indicative in the application of self-assembled films in the micro/nanoelectromechanical systems.

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Tribological Behavior of Terphenyl Self-Assembled Monolayer Studied by a Pin-on-Plate Method and Friction Force Microscopy

Cited by 11 publications

References 19 publications

Macroscopic Tribological Testing of Alkanethiol Self-assembled Monolayers (SAMs): Pin-on-disk Tribometry with Elastomeric Sliding Contacts

Macroscopic Tribological Testing of Alkanethiol Self-assembled Monolayers (SAMs): Pin-on-disk Tribometry with Elastomeric Sliding Contacts

Effects of Structure on the Tribological Properties of Organic Self-Assembled Molecular Layers

Effects of Tail Group and Chain Length on the Tribological Behaviors of Self-Assembled Dual-Layer Films in Atmosphere and in Vacuum

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