Platinum nanorods

Martin B R efa/1999 Orthogonal self-assembly on colloidal gold-platinum nanorods Adv. Mater. 11 1021... 

Krishnaswamy R., Remita H., Imperor-Clerc M., Even C., Davidson P., Pansu B., Synthesis of singlecrystalline Platinum nanorods within a "soft" crystalline surfactant-Pt(ll) complex, Chem. Phys. Chem. 2006,7,1510-1513. 

Kyotani, T., Tsai, L.F. and Tomita, A. (1997) Formation of platinum nanorods and nanopartides in uniform carbon nanotubes prepared by a template carbonization method. Chemical Communications, 701. 

Our approach utilized the metals gold, platinum, then later gold, platinum, and nickel electroplated in succession because the catalytic decomposition of hydrogen peroxide reaction we tested was most efficiently catalyzed with platinum.After fabrication of the nanowires they were freed by removing the conductive silver backing with nitric acid and the sacrificial template with a strong base, sodium hydroxide. Then nanorods were washed with deionized water and ultracentrifuged to achieve a neutral pH. 

FIGURE 3.2. Oxygen evolution for 2E6 platinum/gold nanorods in 10 ml of a 3.74% w/w aqueous solution of hydrogen peroxide. The autocatalytic decomposition of hydrogen peroxide was less than 1 lE-9 mol/min and is therefore insignificant. 

The concept of nanobubbles on surfaces in oxygen saturated water produced the evidence to suggest that a Pt/Au nanorod forms nanobubbles on the gold surface. Therefore, the gold surface can be made hydrophobic in situ. The surface of the platinum is irrelevant because the gradient is not established over the platinum segment. This final piece of evidence was used to explain the direction of movement observed. 

One of the potential applications of catalytically driven motors is in microelec-tromechanical devices (MEMS). Catchmark capitalized on the concept of the platinum-gold nanorods by designing gold gears (150 /rm in size) with platinum spots on the teeth (Fig. 3.4) to produce the first rotating devices driven by the catalytic decomposition of hydrogen peroxide. 

It was concluded that by combining a hematite nanorod electrode with a suitable water oxidation catalysts, for instance platinum or ruthenium dioxide, the photoelectrochemical activity for direct water splitting applications should increase by a factor of 20. 

F. Kleitz, S.H. Choi, and R. Ryoo, Cubic Ia3d Large Mesoporous Silica Synthesis and Replication to Platinum Nanowires, Carbon Nanorods and Carbon Nanotubes. Chem. Commun., 2003, 2136-2137. 

The first one makes use of the pores of membranes as templates for the electrolytic growth of metal nanorods. This technique consists of coating one side of a membrane with a metal electrode (such as gold or platinum) and then elec-trodepositing a metal or conducting polymer within the pores of the membrane [90]. This method controls more closely the filling of the pores compared to other... 

F. Klertz, S. H. Choi, R. Ryoo, Cubic la3d large mesoporous silica synthesis and replication to platinum nanowires, carbon nanorods and carbon nanotubes, Chem. Commun., 17,2136-7 (2003). 

Luong ND, Lee Y, Nam JD (2008) Facile transformation of nanofibrillar polymer aerogel to carbon nanorods catalyzed by platinum nanoparticles. J Mater Chem 18 4254-4259... 

Ohsaka and coworkers initially reported the outstanding catalytic enhancement of OER of MnO,c nanorod modified platinum, gold and glassy carbon (GC) electrodes and evaluated the loading level of MnO (in the manganite phase, y-MnOOH) and the pH of the electrolyte for OER. The nanorods showed a maximum activity in basic medium and the... 

First of all, the forerunning work was performed with electrochemical polymerization of PANI micro- and nanorod fabrication [173,174]. Iridium and platinum needles were used as electrodes, and a PANI microrod was grown on the electrode surface. Another approach was related to the ful-lerene derivatives doping with electrochemical polymerization in order to fabricate PANI microfibers and nanofibers [175,176]. hi addition, PPy microtubes have been synthesized in the presence of S-naphthalene sulphonic acid (jd-NSA) by electrochemical polymerization. This microtube has the diameter of 0.8-2.0 xm and the length of 15-30 im. Electrochemical deposition of PANI has been also carried out within multi-walled CNT. hi addition, PPy microtube (a few mm in length and hundreds xm in diameter) is formed in the presence of Na-toluene sulphonic acid along platinum wire [177]. 

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