Tu Yudi, Ichii Takashi, Khatri Om, Sugimura Hiroyuki
Appl. Phys. Express 7(7) Jul 2014
A dry photoprocess for converting graphene oxide (GO) to reduced GO (rGO) by vacuum–ultraviolet (VUV) irradiation is reported. The rapid reduction of GO was achieved by irradiating a GO sheet in vacuum with 172 nm VUV light at a low power density ...
The ability to reduce palladium (Pd) ions to Pd nanoparticles has been provided on the surface of cycloolefin polymer (COP). The origin of this reductive function is aldehyde and alcoholic hydroxy groups formed by oxidizing the COP surface with ac...
Structural analysis of the interfaces between an ionic liquid (IL) and an organic monolayer was carried out by phase modulation atomic force microscopy (PM-AFM). A quartz tuning fork sensor with a sharpened tungsten tip was used as a force sensor ...
Journal of colloid and interface science 411 145-151 Dec 2013
The photochemical grafting of methyl groups onto an n-type Si(111) substrate was successfully achieved using a Grignard reagent. The preparation involved illuminating a hydrogen-terminated Si(111) that was immersed in a CH3MgBr-THF solution. The s...
Journal of the Electrochemical Society 160 Aug 2013
Cu-Zn alloy formation on a non-conductive epoxy substrate was demonstrated through successive electrochemical processes: (i) conventional electroless Cu deposition on the substrate using an aqueous bath, and (ii) electrochemical alloying of the re...
Single-phase Cu-Sn intermetallics were used to investigate their phase transformations during lithiation/delithiation, together with their negative-electrode properties. The stoichiometric Cu-Sn samples were prepared as thermodynamically warranted...
T. Akishiba, N. Tamura, T. Ichii, Y. Hirai, K. Sugano, T. Tsuchiya, H. Sugimura, O. Tabata, O. Tabata
Proceedings of the IEEE International Conference on Micro Electro Mechanical Systems (MEMS) 307-310 Apr 2013
A new integration technique of Deoxyribonucleic acid (DNA) origami as an excellent platform to arrange various nanomaterials such as metallic nanoparticles, carbon nanotubes and proteins and so on with nanometer scale resolution into MEMS utilizin...
Technical report of IEICE. OME 112(456) 41-46 Feb 2013
Alkyl self-Assembled Monolayers (SAMs), which are covalently bonded to Si through Si-C bonds, have been formed by photochemical processes based on the band excitation of Si. Surface potentials and ionization potentials ofthese SAM-Si samples were ...
Journal of Physical Chemistry C 117 2480-2485 Feb 2013
It is essential to immobilize gold nanoparticles (AuNPs) firmly onto a certain substrate in a closely packed manner to apply plasmonic functions of AuNP in photonic/electronic devices. AuNP-Si systems are of particular interest for the integration...
Solvation structures on liquid/solid interfaces are essential for understanding the mechanisms of various electrochemical reactions. Here, we demonstrate structural analysis on interfaces of ionic liquids (ILs) and electrodes by frequency modulati...
Closely packed two-dimensional (2D) arrays of gold nanoparticles (AuNPs) were successfully immobilized on Si(111) substrates, using the photochemical reaction between alkanethiol-capped AuNPs and hydrogen-terminated silicon surfaces (Si-H). This p...
Vinylferrocene-terminated Si(111) was prepared by illuminating visible light onto a hydrogen-terminated Si(111) surface that was immersed in either diethyl ether-vinylferrocene or dibutyl ether-vinylferrocene solution. The use of either diethyl et...
Photochemical grafting of ferrocene to Si was investigated in a vinylferrocene solution in tetrahydrofuran, diethyl ether, or dibutyl ether. The grafting of vinylferrocene onto a Si(111) surface was carried out by placing a hydrogen-terminated Si(...
Marvin U. Herrera, Takashi Ichii, Kuniaki Murase, Hiroyuki Sugimura
Chemistry Letters 41 902-904 Sep 2012
Methyl-terminated Si(111) surface was successfully fabricated using a photochemical grafting technique. This methylated surface was formed by illuminating visible light onto a hydrogen-terminated Si(111) surface that was immersed in a Grignardtetr...
Om P. Khatri, Takashi Ichii, Kuniaki Murase, Masayuki Kanehara, Toshiharu Teranishi, Hiroyuki Sugimura
Journal of Colloid and Interface Science 382 22-27 Sep 2012
Synthesis of ω-alkenyl-terminated silver nanoparticles (AgNPs) and then their immobilization on a hydrogen-terminated silicon surface in two-dimensional arrangement through covalent interaction are demonstrated. The thermal-induced hydrosilylation...
Om P. Khatri, Om P. Khatri, T. Ichii, K. Murase, H. Sugimura
Journal of Materials Chemistry 22 16546-16551 Aug 2012
UV photon induced assembly of ω-alkenyl terminated gold nanoparticles (AuNPs) on pre-defined sites of crystalline silicon surface through covalent interaction is demonstrated. Highly ordered and stable hexadecyl monolayer on oxide free silicon sur...
Frequency modulation atomic force microscopy (FM-AFM) imaging in ionic liquids (ILs) were carried out. A quartz tuning fork sensor with a sharpened tungsten tip was used as a force sensor instead of a Si cantilever. Only the tip apex was immersed ...
