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Formation of a Highly-ordered Thiophene Monolayer on Au(111) via Vapor Phase Deposition
이동진,성시천,노재근 대한화학회 2019 Bulletin of the Korean Chemical Society Vol.40 No.7
STM images and structural model of thiophene self-assembled monolayers on Au(111).
이제원,성시천,진소영,정영도,노재근 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.100 No.-
A reusable and efficient photo-catalyst based on halloysites (HNTs) and La3+ ion-doped TiO2nanoparticles was prepared using a sol-gel process and a sonochemical method for decomposingorganic dyes. As a support, the HNTs increased the adsorption efficiency of substrates, improving thephotocatalytic activity of TiO2 nanoparticles by3 times. The La3+ ion doping of TiO2 decreased thebandgap from 3.25 eV to 3.01 eV, expanding the spectral response to the visible region and enhancing thephotocatalytic activity under the sunlight by 1.5 times. Through the integration of the halloysite supportand the La3+ ion doping of TiO2, the synergistic enhancement of photocatalytic activity was observed andsystematically investigated using XRD, Raman spectroscopy, FT-IR, FE-SEM, EDX-TEM, and zeta potential. In this research, we used Rhodamine B molecules as a model pollutant. During the decomposing process,the HNTs enhanced the local dye concentration nearby the photo-catalyst through the electrostaticinteraction, thereby boosting the photocatalytic activity by3 times. Additionally, the catalyst can beseparated by simple centrifugation and reused at leastfive recycles without any activity decrease. Thehalloysite support, the La3+ ion doping of TiO2 and their simple synthesis approach could provide apractical tool for environmental purification in wastewater using sunlight.
김준우,정현학,성시천,김민기,김동구,황왕택,장연식,최유리,구정민,박승범,노재근,이탁희 한국물리학회 2017 Current Applied Physics Vol.17 No.11
We investigated the effect of molecular backbone structure on the electrical transport properties of selfassembled monolayer (SAM)-based molecular devices which were made with using three different molecules; benzenethiol (denoted as BT), cyclohexanethiol (CHT), and adamantanethiol (ADT). These molecules have similar ring-shaped backbone structures but different molecular orbital systems. The molecular devices were fabricated as a vertical metal-SAM-molecule structure by a conventional optical lithography-based microscale via-hole technique with employing PEDOT:PSS (poly(3,4- ethylenedioxythiophene)) stabilized with poly(4-styrenesulfonic acid) interlayer, which leads to a high device yield.We found that the current density of BT molecular devices was one order higher than that of CHT and ADT molecular devices due to the different molecular orbital systems. Also, we observed that the current densities of CHT and ADT devices were slightly different according to the statistical analysis because of the different structural uniformity of SAMs.
이남석,강훈구,성시천,노재근 대한화학회 2019 Bulletin of the Korean Chemical Society Vol.40 No.12
STM images showing the phase transition of OT SAMs on Au(111) from the closely packed c(4???2) phase to the loosely packed (6???√3)25° phase.