Kyushu University · Engineering
Professor Kaoru Tamada's research lab specializes in the design, fabrication, and characterization of functional self-assembled monolayers (SAMs) and nanostructured surfaces, with a focus on molecular engineering at the liquid–solid interface. Key research directions include the development of photoresponsive SAMs based on azobenzene derivatives for optical switching and surface patterning, the structural and electronic characterization of fluorinated and semifluorinated alkanethiol SAMs, and the fabrication of plasmonic nanostructures using nanoparticle assemblies. The lab employs advanced surface-sensitive techniques such as AFM, XPS, surface plasmon resonance, and IR spectroscopy to probe molecular organization, interfacial interactions, and dynamic surface processes at the nanoscale.
Figures are computed from collected data and may differ slightly.
n-Alkanethiol (CnH2n+1SH) self-assembled monolayers (SAMs) adsorbed on Au(111) were studied with an atomic force microscope (AFM) to confirm the influence of the lateral interaction between adsorbed thiols on the film morphology. Two experiments were performed: firstly, a study of the domain formation at the initial stage of SAM growth (single component) and, secondly, investigations of the coadsorption phenomenon in mixed SAMs composed of two alkanethiols having different chain lengths. For the
The structures of semifluorinated alkanethiol self-assembled monolayers (SAMs) generated by the adsorption of CF3(CF2)9(CH2)nSH (F10HnSH, n = 2, 6, 11, 17, 33) onto gold were investigated with atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), and surface plasmon resonance spectroscopy. Images obtained by AFM of the F10H2SH SAM showed a remarkably ordered 2D hexagonal lattice with a lattice constant, a = 5.9 ± 0.1 Å, on Au(111)/mica. As the total number of carbon atoms in the
The structure and growth of functionalized thiol self-assembled monolayers (SAMs) on Au(111) derived from a new compound, 12-(4-((4-hexylphenyl)azo)phenoxy)dodecane-1-thiol (“hexyl azobenzene thiol”), were examined by atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), dynamic contact angles, Fourier transform infrared-reflection absorption spectroscopy (FTIR-RAS), and reflection UV−vis absorption spectroscopy. The hexyl azobenzene thiol SAM showed adsorption kinetics comparab
We report the characteristics of azobenzene-containing self-assembled monolayers (SAMs) which are designed and synthesized for surface photoisomerization reactions. The photoreactive SAMs were composed of unsymmetrical azobenzene disulfides, in which the free volumes for photoreaction of azobenzene moieties are guaranteed by 50% dilution of dye functions at the molecular level on the surface. The photoswitching reaction was monitored in situ through the change of optical film thickness by means
This paper describes unique plasmonic characteristics of two dimensional (2D) crystalline sheets composed of homogeneous Ag nanoparticles (AgNPs) fabricated by the Langmuir-Schaefer method at an air-water interface. The localized surface plasmon resonance (LSPR) band of the Ag nanosheet was tuned by changing the interparticle distance of AgNPs via the length of the organic capping molecules. Red shift of the LSPR band of the AgNPs sheet followed an exponential law against the interparticle dista
Recently we have developed an unsymmetrical azobenzene disulfide with a short alkyl side chain, 4-hexyl-4‘-(12-(dodecyldithio)-dodecyloxy)azobenzene (C6AzSSC12), aiming of a high efficiency in photoisomerization in SAMs on planar gold surfaces (Tamada, K.; et al. Langmuir 2002, 18, 5239). In this paper, we introduce an additional modification on the molecule to improve the thermal endurance for the photoreaction by attachment of a methyl group to the azobenzene ring, thus avoiding dye aggregatio
The surface property of two kinds of synthetic glyceroglycolipids was investigated to confirm the stereoeffect of sugar residues on the phase behavior in monolayers: one is the maltooligosaccharide-containing lipids [MalN(C12)2] and the other is cellooligosaccharide-containing lipids [CelN(C12)2]. The two kinds of glycolipids exhibit the opposite dependence of the surface pressure−area (Π−A) isotherm on the number of glucose residues (N), in that MalN(C12)2 tends to be more expanded as N increas
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLateral diffusion of a probe lipid in biphasic phospholipid monolayers: liquid/gas coexistence filmsKaoru Tamada, Sanghoon Kim, and Hyuk YuCite this: Langmuir 1993, 9, 6, 1545–1550Publication Date (Print):June 1, 1993Publication History Published online1 May 2002Published inissue 1 June 1993https://pubs.acs.org/doi/10.1021/la00030a020https://doi.org/10.1021/la00030a020research-articleACS PublicationsRequest reuse permissionsArticle Views139Altmetric-Ci
The advent of lead halide perovskite nanocrystals (NCs), which are easily synthesized, ultralow-cost materials and have an impeccable luminous efficiency, has drastically changed the future perspective of semiconductor quantum dot devices. Although the band gap energy of lead perovskite NCs can be tuned by the halide composition, the instability problem prevails for mixed-halide perovskite NCs, caused by phase segregation due to ion migration when an external electric field or light is applied.
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