<P>We describe a poly(methyl methacrylate) (PMMA) dip-coating procedure, which results in surface stabilization of phosphonate and carboxylate derivatives of Ru(II)-polypyridyl complexes surface-bound to mesoporous nanoparticle TiO<SUB>2&l...
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https://www.riss.kr/link?id=A107700362
2014
-
SCOPUS,SCIE
학술저널
13514-13517(4쪽)
0
상세조회0
다운로드다국어 초록 (Multilingual Abstract)
<P>We describe a poly(methyl methacrylate) (PMMA) dip-coating procedure, which results in surface stabilization of phosphonate and carboxylate derivatives of Ru(II)-polypyridyl complexes surface-bound to mesoporous nanoparticle TiO<SUB>2&l...
<P>We describe a poly(methyl methacrylate) (PMMA) dip-coating procedure, which results in surface stabilization of phosphonate and carboxylate derivatives of Ru(II)-polypyridyl complexes surface-bound to mesoporous nanoparticle TiO<SUB>2</SUB> and nanoITO films in aqueous solutions. As shown by contact angle and transmission electron microscopy (TEM) measurements, PMMA oligomers conformally coat the metal-oxide nanoparticles changing the mesoporous films from hydrophilic to hydrophobic. The thickness of the PMMA overlayer on TiO<SUB>2</SUB>–Ru(II) can be controlled by changing the wt % of PMMA in the dipcoating solution. There are insignificant perturbations in electrochemical or spectral properties at thicknesses of up to 2.1 nm with the Ru(III/II) couple remaining electrochemically reversible and <I>E</I><SUB>1/2</SUB> values and current densities nearly unaffected. Surface binding by PMMA overlayers results in stable surface binding even at pH 12 with up to a ∼100-fold enhancement in photostability. As shown by transient absorption measurements, the MLCT excited state(s) of phosphonate derivatized [Ru(bpy)<SUB>2</SUB>((4,4′-(OH)<SUB>2</SUB>PO)<SUB>2</SUB>bpy)]<SUP>2+</SUP> undergo efficient injection and back electron transfer with pH independent kinetics characteristic of the local pH in the initial loading solution.</P><P><B>Graphic Abstract</B>
<IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/2014/jacsat.2014.136.issue-39/ja506987a/production/images/medium/ja-2014-06987a_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja506987a'>ACS Electronic Supporting Info</A></P>
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