Journal Article10.1021/JA00246A012
Improved charge separation and photosensitized hydrogen evolution from water with titanium dioxide particles on colloidal silica carriers
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TL;DR: In this article, the authors show that electrostatic interactions have a dramatic influence on the kinetics for charge separation and hydrogen production in aqueous systems (pH 9.8) of 20-nm diameter TiO/sub 2/modified SiO/Sub 2/ colloids in various combinations with an electron relay, a photosensitizer, and a Pt catalyst.
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Abstract: Laser flash photolysis and steady-state photolysis studies show that electrostatic interactions have a dramatic influence on the kinetics for charge separation and hydrogen production in aqueous systems (pH 9.8) of 20-nm diameter TiO/sub 2/-modified SiO/sub 2/ colloids in various combinations with an electron relay, a photosensitizer, and a Pt catalyst. Either direct excitation of the semiconductor or the photosensitizer Ru(bpy)/sub 3//sup 2 +/ (bpy = 2,2'-bipyridine), electrostatically adsorbed to the colloid, initiate electron transfer to either the zwitterionic electron relay, N,N'-bis(3-sulfonatopropyl)-4,4'-bipyridinium (PVS/sup 0/), or N,N'-bis(3-sulfonatopropyl)-2,2'-bipyridinium (DQS/sup 0/), or methyl viologen (MV/sup 2 +/). The rates and quantum yields for the formation of the radical PVS/sup -/ anion in both the TiO/sub 2/-SiO/sub 2//PVS/sup 0/ and the TiO/sub 2/-SiO/sub 2//Ru(bpy)/sub 3//sup 2 +//PVS/sup 0/ systems decline with increasing ionic strength. The rate and quantum yields for H/sub 2/ production in both the TiO/sub 2/-SiO/sub 2//DQS/sup 0//Pt and the TiO/sub 2/-SiO/sub 2//Ru(bpy)/sub 3//sup 2 +//DQS/sup 0//Pt systems also show a similar ionic strength dependence.
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Citations
Charge Transfer through Single-Stranded Peptide Nucleic Acid Composed of Thymine Nucleotides
Amit Paul,Richard M. Watson,Paul E. Lund,Yangjun Xing,Kathleen Burke,Yufan He,Eric Borguet,Catalina Achim,David H. Waldeck +8 more
TL;DR: In this paper, self-assembled monolayers (SAMs) of single-stranded peptide nucleic acids (PNAs) containing 3 to 7 thymine (T) nucleotides, a C-terminus cysteine, and an Nterminus ferrocene group were formed on gold electrodes.
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Self-Assembled Monolayers on Gold of Thiols Incorporating Conjugated Terminal Groups†
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TL;DR: In this article, the authors measured the thickness of self-assembled monolayers on polycrystalline gold using optical ellipsometry and showed that the thickness correspond to the expected thickness of monolayer films in which the components are oriented roughly perpendicular to the Au surface.
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Semipermeable, chemisorbed adlayers of focally-substituted organothiol dendrons on gold
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Contact Hysteresis and Friction of Alkanethiol Self-Assembled Monolayers on Gold
J.D. Kiely,J.E. Houston +1 more
TL;DR: In this paper, nanometer-scale friction measurements were used to identify dissipative mechanisms responsible for friction in hexadecanethiol self-assembled monolayers on Au, and they were combined with nanometre-scale feedback measurements to identify the dissipative mechanism.
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