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Atomic Force Microscopic Study of Chitinase Binding onto Chitin and Cellulose Surfaces
Kikkawa, Yoshihiro,Fukuda, Masato,Kimura, Tomoya,Kashiwada, Ayumi,Matsuda, Kiyomi,Kanesato, Masatoshi,Wada, Masahisa,Imanaka, Tadayuki,Tanaka, Takeshi American Chemical Society 2014 Biomacromolecules Vol.15 No.3
<P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/bomaf6/2014/bomaf6.2014.15.issue-3/bm500046f/production/images/medium/bm-2014-00046f_0004.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/bm500046f'>ACS Electronic Supporting Info</A></P>
Kim, Dae-Gun,Koyama, Emiko,Kikkawa, Yoshihiro,Kirihara, Kazuhiro,Naitoh, Yasuhisa,Kim, Deok-Soo,Tokuhisa, Hideo,Kanesato, Masatoshi,Koshizaki, Naoto IOP Pub 2007 Nanotechnology Vol.18 No.20
<P>Au/SiO<SUB>2</SUB> nanocomposite films consisting of an extremely high number density of Au nanoparticles dispersed in a SiO<SUB>2</SUB> matrix a few nanometres thick were deposited by a co-sputtering method, and employed for molecular conductance measurement by immobilizing and bridging conjugated biphenyl molecules on dispersed Au nanoparticles. The number density of Au nanoparticles in the insulating SiO<SUB>2</SUB> matrix was approximately 14 000 µm<SUP>−2</SUP>, and the average interparticle distance from their neighbours was about 8 nm. The current increased considerably up to the range of nanoamperes after the immobilization of the conjugated biphenyl molecules, 10<SUP>5</SUP> times larger than without molecules before immobilization. Although the Au nanoparticles can be connected to only 30% of all combinations of neighbouring Au nanoparticles by biphenyl molecules 2.4 nm long from the topological analysis, the biphenyl molecules can bridge most of the Au nanoparticles, and their bridging continuity is over 100 nm in length. Thus the measured current is suggested to come from the continuously bridged molecules between the Au nanoparticles. Furthermore the <I>I</I>–<I>V</I> data of the whole Au/SiO<SUB>2</SUB> nanocomposite film immobilized with conjugated molecules are confirmed to be in a reasonable range in comparison with the scanning tunnelling spectroscopy data of similar conjugated molecules.</P>
Immobilization of π-conjugated molecules on Au using dendrimer-based templates
Hideo Tokuhisa,Emiko Koyama,Abdelhak Belaissaoui,Hiroshi Suga,Takao Ishida,Yasushiro Nishioka,Masatoshi Kanesato 한국물리학회 2006 Current Applied Physics Vol.6 No.4
In this paper, we demonstrate immobilization of two kinds of p-conjugated molecules on Au using dendrimer-based templates; one is a p-phenylene ethynylene derivative and the other is a 4,40-bis(phenylethynyl)-2,20-bipyridine derivative. Both molecules were bound to benzyl-ether dendrons through an alkali-labile, ester linkage to give two different generation dendrimers. The removal of the dendrons from the self-assembled monolayers of the dendrimers left the isolated p-conjugated-molecules as well as small collections of the molecules on the surfaces, which was confirmed by surface Fourier transform infrared (FT-IR) spectroscopy and scanning tunneling microscopy (STM). Insertion of the dendrimer into n-dodecanethiol monolayer instead of the direct adsorption on a bare gold gave only the isolated, single molecules on the surface after the dendrons were removed.