High-resolution imaging of organic monolayers using noncontact AFM

Uchihashi, Takayuki; Ishida, Takao; Komiyama, Masaharu; Ashino, Makoto; Sugawara, Yasuhiro; Mizutani, Wataru; Yokoyama, Kousuke; Morita, Seizo; Tokumoto, Hiroshi; Ishikawa, Mitsuru

doi:10.1016/s0169-4332(99)00534-6

Cited by 67 publications

(55 citation statements)

References 20 publications

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“…These images were acquired in tapping mode using a Pacific Nanotechnologies Nano-R AFM. The morphology of the Au surface is consistent with 2D Stranski-Krastanov island/monolayer growth [39]. The Cr adhesion layer not only increases the adhesion of the gold to the surface but allows for 2D Stranski-Krastanov island/monolayer growth of the Au rather than the typical Volmer-Weber 3D island growth [39] We believe the boundary formation between neighboring Au grains is due to the presence of Au step edges, because it is difficult to obtain dense packing of alkanethiols at Au step edges.…”

Section: Resultssupporting

confidence: 66%

“…The morphology of the Au surface is consistent with 2D Stranski-Krastanov island/monolayer growth [39]. The Cr adhesion layer not only increases the adhesion of the gold to the surface but allows for 2D Stranski-Krastanov island/monolayer growth of the Au rather than the typical Volmer-Weber 3D island growth [39] We believe the boundary formation between neighboring Au grains is due to the presence of Au step edges, because it is difficult to obtain dense packing of alkanethiols at Au step edges. Alkanethiols are believed to bond at the three-fold hollow sites between the hexagonal arrangement of Au atoms on a Au{111} surface [11,12,[29][30][31][32].…”

Section: Resultssupporting

confidence: 66%

“…The detailed study of the self-assembly of 1-nonanethiol of Au{111} described in the previous sections has given valuable information on the eventual quality of the monolayer at of the Au during the SAM growth process [19,26,39].…”

Section: Surface Uniformity Of 1-nonanethiol Monolayers On Au{111}mentioning

confidence: 99%

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The Nature of Alkanethiol Self-Assembled Monolayer Adsorption on Sputtered Gold Substrates

2004

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A detailed study of the self-assembly and coverage by 1-nonanethiol of sputtered Au surfaces using molecular resolution atomic force microscopy (AFM) and scanning tunneling microscopy (STM) is presented. The monolayer self-assembles on a smooth Au surface composed predominantly of {111} oriented grains. The domains of the alkanethiol monolayer are observed with sizes typically of 5−25 nm, and multiple molecular domains can exist within one Au grain. STM imaging shows that the (4 × 2) superlattice structure is observed as a (3 × 2 ) structure when imaged under noncontact AFM conditions. The 1-nonanethiol molecules reside in the threefold hollow sites of the Au{111} lattice and aligned along its [112] lattice vectors. The self-assembled monolayer (SAM) contains many nonuniformities such as pinholes, domain boundaries, and monatomic depressions which are present in the Au surface prior to SAM adsorption. The detailed observations demonstrate limitations to the application of 1-nonanethiol as a resist in atomic nanolithography experiments to feature sizes of ∼20 nm.

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Section: Resultssupporting

confidence: 66%

Section: Resultssupporting

confidence: 66%

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The Nature of Alkanethiol Self-Assembled Monolayer Adsorption on Sputtered Gold Substrates

2004

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“…Standard "Golden" silicon cantilevers with nominal spring constant 11.5 N/m and resonance frequency 255 kHz and high aspect ratio conical tips (cone angle less than 22°) with curvature radius of 10 nm and tip height of 10-20 μm, were used. Semi-noncontact operation mode of AFM was employed to avoid the damage of the soft platelets by the sharp conical tip (Uchihashi et al 2000). The platelets morphology was not changed during AFM scanning as they were fi xed with 5 μl glutaraldehyde 1% for one and two hours of observations and were not fully dehydrated.…”

Section: Experimental Methodsmentioning

confidence: 99%

Impact of surface electric properties of carbon-based thin films on platelets activation for nano-medical and nano-sensing applications

Karagkiozaki

Logothetidis

Lousinian³

et al. 2008

IJN

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Electric surface properties of biomaterials, playing key role to various biointerfacial interactions, were related to hemocompatibility and biosensing phenomena. In this study, the examination of surface electric properties of amorphous hydrogenated carbon thin fi lms (a-C:H) was carried out by means of electrostatic force microscope (EFM) and observation of differences in spatial charge distribution on the surface of the examined fi lms during platelets adhesion was made. The thrombogenic potential of a-C:H thin fi lms developed by magnetron sputtering with ∼42% sp 3 content and hydrogen partial pressure during deposition was evaluated,by in situ observation with atomic force microscope (AFM) of platelets' activation and their subsequent adhesion. Platelet-rich plasma drawn from healthy donors was used and semi-contact mode of AFM was applied. Platelets behavior and their correlation with the electric surface properties of the examined a-C:H fi lms by EFM was made for hemocompatibility enhancement and sensing platelets that are less electrical negatively charged and with higher tendency to aggregate and form thrombus. The results are discussed in view of the effect of different deposition conditions of hydrogenated carbon fi lms on their structural and morphological characteristics, surface roughness and electrical properties attributing to different hemocompatibility and sensing aspects.

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“…From 1997 to 2000, main subject of this research area was to understand the imaging mechanism of organic molecules by FM-AFM. For this purpose, model organic systems that had been extensively studied by STM were imaged by FM-AFM [7][8][9][10][11][12][13]. The formation mechanism of the obtained molecular-scale contrasts was discussed in relation to the operation principle of FM-AFM.…”

Section: Introductionmentioning

confidence: 99%

INVITED PAPER: Instrumentation and Biological Applications of High-Resolution Frequency Modulation Atomic Force Microscopy in Liquid

Fukuma

2009

JNanoR

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Abstract. Frequency modulation atomic force microscopy (FM-AFM) has been a powerful tool for imaging atomic-scale structures and properties of various materials including metals, semiconductors, metal oxides, alkali halides and organic systems. Whilst the method has been used mainly in ultrahigh vacuum environments, recent progress in FM-AFM instrumentation made it possible to apply this technique also to investigations in liquid. This technological innovation opened up a variety of applications of FM-AFM in biology and electrochemistry. To date, the improved FM-AFM instrument and technique have been applied to investigations of several biological materials, providing novel information that has not been accessible with other imaging techniques. In this review, I will summarize the recent progress in FM-AFM instrumentation and biological applications in liquid.

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High-resolution imaging of organic monolayers using noncontact AFM

Cited by 67 publications

References 20 publications

The Nature of Alkanethiol Self-Assembled Monolayer Adsorption on Sputtered Gold Substrates

The Nature of Alkanethiol Self-Assembled Monolayer Adsorption on Sputtered Gold Substrates

Impact of surface electric properties of carbon-based thin films on platelets activation for nano-medical and nano-sensing applications

INVITED PAPER: Instrumentation and Biological Applications of High-Resolution Frequency Modulation Atomic Force Microscopy in Liquid

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